The Machine Gunconfidential

Aircraft Cannon 5.5-cm MK-112. Longitudinal and transverse sections. Figure 25-10. Aircraft Cannon 5.5-cm MK-112. Right side view. achieved at high temperatures. The performance of the ammunition belt was not satisfactory in the early design. Further experimental tests were performed and the required firing rate of 300 rounds a minute was achieved. Also a belt lift of 2 meters was obtained. Bursts of fire to 20 rounds were fired in the initial firing. Increasing the rate to 360...

Confidential

Figure 21-17. 20-mci Antiaircraft Gun Type 204 GK. Left side view, Figure 21-19. 20-mm Antiaircraft Gun Type 204 GK with cover open. Figure 21-18. 20-mm Antiaircraft Gun Type 204 GK. Right side view. Figure 21-18. 20-mm Antiaircraft Gun Type 204 GK. Right side view. Figure 21-19. 20-mm Antiaircraft Gun Type 204 GK with cover open.

Info

M2E1, cal. .50 machine gun 9 M2E1, 20-mm automatic gun 25 M2E2, 20-mm automatic gun 25 M2E3, 20-mm automatic gun 25 M2E4, 20-mm automatic gun 25 M2HB, cal. .50 machine gun 345 M3, cal. .50 machinc gun 6, M3, 20-mm automatic gun 25, Tabic 395 M3, 40-mm mount 41 M3, 75-mm aircraft gun 155, 157 M4, 37-mm automatic gun . 31, 35, 351, 353 Tables 352,353 M4, 75-mm aircraft cannon 155, Table 161 M4E1, 37-mm automatic gun 36 M4E2, 37-mm automatic gun 36 M4E3, 37-mm automatic gun 36, 39 M4E4, 37-mm...

Buffer and Recuperator

Before any of the following operations can be carricd out the gun and automatic loader must be removed from the aircraft. Removing the Buffer and Recuperator from the Cradle. Place the gun at an angle of depression and secure it to the cradle. Remove the split pin and piston rod nut, and the cradle front cap. Remove the split pin and the gun securing nut from the rear of the buffer cylinder, using the spanner provided. Remove the buffer and recuperator from the front of the cradle....

Section General Description Of The S

The 40-mm S gun is an automatic, rccoil-op-erated weapon using the more or less orthodox big-gun principle of spring and hydraulic system to absorb the recoil energy. The weapon has a low rate of fire and lone recoil stroke. As a result, effi-cient buffer systems arc possible. Energy is absorbed gradually during the recoil and return stroke of the barrel, barrel extension, and breech. The recuperator for the barrel, barrel extension, and brccch consists of helical springs, and, in addition, the...

Shirgun

One, somewhat different, was built by the Shirgun Corporation. The differences in the latter model grew out of results of firing tests of the guns made at the Naval Gun Factory. The tests were conducted at the Naval Proving Ground at Dahlgren, Va. 20-mm Machine Gun Mechanism EX 1, Type 2. This developmental type had redesigned operating parts. The silhouette was accordingly flattened out, and the weight was reduced to 160 pounds. The charger was of the double-acting pneumatic type, and an...

Cal Short Recoil

Studs projecting inward from the cover. Push the charger completely forward, and turn it clockwise until the motor mount locking plunger snaps into position. 1. The bolt head rollers can be readily removed, as there is nothing to retain them in place. 2. Place the bolt on a wooden block, and with a hammer and a drive punch of the proper size drive out the roll pins. Start the removal of the buffer bodies by tapping with a block of wood. Pull the bolthcad out of the bolt. Then grasp the...

T

Type 404 17,25,381-421,533 Type 804 531,532 Type 820 532 20-mm cannon 9, 11, 459 Hispano-Suiza aircraft cannon development in Switzerland and Great Britain 531-546 British development 544 John Inglis gun 545 20-mm automatic gun Mks I-V. . . 544 Development by parent company. . . . 531 History 531 Post. World War IT weapon design . . 531 Facilities for manufacture, Chart of. . 533 Hispano-Suiza ammunition 188, Mattschaps Horsman, Howard, Howitzer, Hughes Aircraft Co 166, 169, 172 Hurricane I ID...

Section Background And Evolution Of The T

Design of the 20-mm automatic gun T33 was initiated by the Oldsmobilc division of General Motors Corp. in 1944 under a contract with the Ordnance Corps to produce a high cyclic rate 20-mm aircraft weapon. The first line of endeavor was to modify the 20-mm automatic gun T19 that was being devised by the Draper Corp. of Milford, Mass. The Draper weapon featured a compact cross-feed mechanism with a star wheel which straddled the bolt and held the link while a round was stripped, fired, and...

Section History And Background

History and Background of the Bofors Plant The Bofors Arms Co. is one of the oldest arms producing plants in the world. I he name first, appeared in the Swedish public records in November 1646, when one Paul Horsman was granted permission to crcct a forge and hamtnermill in the mining district of Bofors, located in central Sweden. This forge was typical of many such places that were later to bring fame to the Swedish steel industry. There was nothing outstanding about this particular...

Mm Automatic Guns with Mark and Mod Numbers

No Mk 1 assigned to United States equipment. British Oerlikon. 20-mm Machine Gun Mechanism Mk 2 Mod 0. Manufactured from drawings prepared for production of the British Mark II Oerlikon. 20-mm Machine Gun Mechanism Mk 2 Mod 1. Refinement of the Mk 2 Mod 0. 20-mm Machine Gun Mechanism Mk 3. No Mk 3 assigned to United States equipment. British. 20-mm Machine Gun Mechanism Mk 4 Mod 0. Oerlikon manufactured from drawings prepared by XOP Ccnterline. Same as Mk 2,...

Basic Barrel Development

Development work on the gun barrel has been carried on by Springfield Armory and Frankford Arsenal. The initial requirement for the T17 gun called for a quickly detachable and replaceable barrel. This feature, suggested by Frigidairc, had earlier been taken from the German MG 151 20 design. Springfield Armory made the first barrels and integrated the barrel design. After the initial barrels were fired, Springfield Armory worked on improvements in metal strength characteristics and heat...

Oerlikon Rk 206

For this purpose a spindle with a crank is provided, which is inserted through the bore in the rear wall of the casing and screwed into the bore of the ram. Then the nut has to be screwed into this bore over the spindle. The ram and the slide can then be moved rearward and forward again by rotating the crank. In the rear position, the shaft must be rotated in order to allow the roller to overcome the neutral position of cam groove in the slide with which it...

Index

Recoilless gun 651, 652 Reich Luftfahrt Bank 609 Reichskredit Bank 609 Reloader, electric 113 Remington Arms Co 16, 91, 166, 167 Rcscarch & Development Service (See U. S. Research and Development Service.) Revolver cannon, gas-opcrated 43-86 ARF development 45-66 Description 47 Dcvclopmen t 45 History 43 Operation 50 Revolver cannon, Marquardt 165-185 History 165 Mk 11 Mod 0, 20-irim Assembly 184 Description 174 Disassembly 182 Revolver cannon, power-driven multi- barrel 87-103 A model, T45...

Woo

Ordnance Corps 75-mm Gun M4 on Mount M6. Left side view. in May 1943, showed that the petals of the muzzle cover would not stay closed accordingly, the Air Force abandoned the muzzle cover as a requirement. Initiated in May 1942 75-mm gun T9, which was designed as a light weight 75-mm gun for aircraft use, had the same ballistic characteristics as those of 75-mm gun M4. Two pilot models were constructed one had a closed and the other open breech ring. In December 1942 these pilots...

Design Procedure

Among the engineers in the newly acquired factory were some of Germany's most talented auto-malic cannon specialists. The genius of Fritz Herlach and Theodor Rakula is shown in a unique approach to the design of weapons as well as in their own professional skill in developing actual working principles. Herlach's excellent work in designing automatic arms won him the presidency of the company he succeeded the world-famous Hcinrich Ehrhardt, designer of artillery and other types of military...

Industromatic Corporation

Oldsmobile provided for the manufacture of more parts. This added 10,000 to the manufacturing cost, exclusive of development costs. The gun was shipped to the Shirgun Corp. on 26 September 1944. Shortly thereafter, Oldsmobile, at the request of the Bureau of Ordnance, shipped all remaining castings, forgings, and unfinished parts to the Shirgun Corp. In 1944 a separate task was initiated with the Shirgun Corp. for the development of the double barrel gun to meet the same characteristics as the...

Revolver Cannon

The rifling torque and the torque produced by the force of the drum roller on the actuating slide cam arc transmitted through the trunnions by means of the hexagonal bearing at the front end of the drum support and the mating hexagonal socket in the rear end of the tube support. However, because of flexure of the sidcarms of the drum support, some of the torque produced by the force of the drum roller on the actuating slide cam is trans-milled to the receiver through the L-sIot...

Oerlikon

It was not found practicable to determine any reliable values for the obturation efficiency of the breechblock piston. Only an indication could be obtained by observing the frequency and intensity of breech flash. Only five occurrences of breech flash were observed. On three of these rounds, photographic records were attempted. The flash recorded with low intensity on the negatives, and did not print over. The breech smoke was also observed. The smoke was more pronounced when single rounds were...

Contents

PART VIII AUTOMATIC WEAPON DEVELOPMENT DURING AND AFTER WORLD WAR II BY THE UNITED STATES 1. Automatic Gun Designations of the Armed Section 1. Section 2. Characteristics of United States Large-Caliber Automatic Guns 4 Caliber .50 Machine Caliber .60 Machine 20-mm Automatic Guns with T and M Numbers 20-mm Automatic Guns with Mark and Mod 20-mm Machine Guns with EX Caliber .90 Machine Guns with T 27-mm Automatic Guns with T 30-mm Automatic Guns with T 30-mm Machine Guns with Mark and Mod...

The Machine Gun

It bottoms spring and binds the breechblock. Stake screw in place. 2. Install accelerator spring and plunger, and hold compressed while installing the accelerator assembly. The small end of plunger must engage in the groove in accelerator body. Install accelerator retainer and stake retainer screw in place. 3. Install ejector spring and ejector, with the flanged edge of ejector under the bronze shoe. Install castellated nut and V13- by 5 -inch cotter pin. 4. Place trigger lever spring and...

Belt Feed Tube

View showing how belt feed rack is moved outward during counterrecoil. pending on the duty required. The motor contains a locking plunger which engages a mating hole in the cover for retaining the charger. The motor mount also provides the housing for the lead screw which is rotated by the motor through the friction drive assembly. The feed assembly is mounted on the under side of the cover and is secured to the cover by two feed body locks. The stripper rack assembly includes the...

Feeder Timing

Feeder-timing marks and holes have been put in the completed feeder and gearbox assembly to facilitate timing. However, timing should be carefully checked each time the feeder and gearbox assembly is removed from the gun. Timing the Feeder and Gearbox Assembly. 1. Rotate the rotor so that the number one barrel is on top and the lines marked T are lined up. 2. Rotate the feeder sprockets so that the line (on the sprocket tooth) marked T lines up with the upper support. Clamp or hold the...

Description

The gun standardized as the caliber .60 T17E5 aircraft machine gun is a recoil-operated, air-cooled, belt-fed weapon. The belt is of the metallic link disintegrating type. The gun can be prepared for cither left- or right-hand feeding. Firing is by means of a solenoid, but a manual release for the sear is also provided. The weapon is provided with a shock absorbing adaptor which also serves as a front mounting. The gun is charged by an electric charger mounted in the cover and fired from an...

Browning

Comparison of bolt components lor Browning Caliber .50 machine guns. Parts for the M2 bolt assembly arc shown at right, and corresponding parts for T25E1, at left. Figure 11-2. Comparison of bolt components lor Browning Caliber .50 machine guns. Parts for the M2 bolt assembly arc shown at right, and corresponding parts for T25E1, at left. Nine breakages and three malfunctions occurred in 770 rounds, and the test was stopped. Satisfactory functioning had not been obtained with the...

Section Caliber T Machine

The caliber .60 machine gun T39 differs only from the T17E3 in that it has a special bolt and bol the ad interchangeable with the percussion bolt, and a contact switch with the necessary wiring to an external power source to fire electrically primed ammunition. It was expected that this model would meet all the Air Force requirements for synchronization and fire interruption. The first electrical bolt was a copy of the German M G 151 20. This bolt gave excellent ignition time and was remarkably...

Colt Mm Cannon

The bolt extension and operating in a gap or slot in the actuating bar. The feed lever, pivoted on a stud located in the cover, receives its movement through a stud in the actuating bar sliding in a gap or slot in the feed lever. The feed lever in turn causes the feed slide to move due to its being in contact with a circularly formed end of the feed lever which works in a gap in the feed slide. The slide carries the feed pawl, which is actuated by a spring and pivots on an axis pin. The forward...

Xrt Sub Machine

A cocking lever pin locking pin and cocking lever pin locking pin spring are used in the modified bolt of the gun AN-M3. The. gun AN-M2 does not have these two items. 12. The firing pin for the gun AN-M3 is slightly different in shape from the firing pin for the gun AN-M2. In addition, firing pins for the gun AN-M3 are drilled so that they mav be sccurcd to the 13. The bolts for the gun AN-M3 are lighter than the bolts for the gun AN-M2. 14. The extractor assembly for the gun AN-M3 has a...

Mm Automatic Guns with T and M Numbers

Millimeter Machine Guns

Gun, Automatic, 20- nm TL The Hispano-Suiza type 404 was tested in the United States beginning in 1938 and was officially designated the 20-mm T1. Gun, Automatic, 20-mm T9. Standard Hispano M2 gun with modified chamber. Gun, Automatic, 20-mm T10. Standard Hispano M2 gun with a different modification to the chamber. Gun, Automatic, 20-mm T12. Standard Hispano M2 guns with another chamber design. Gun, Automatic, 20-mm T14. Standard Hispano M2 gun except chamber and origin of rifling 1-mm short....

Dismantling and Assembling Removing and Installing the Gun and Automatic Loader

The removal and installation of the gun and automatic loader must be undertaken when the aircraft is on level ground, A type D or E bomb trolley should be used as a mobile platform on which to lower the gun and the. loader, the breech of the gun and the cradle being rested upon suitable blocks of wood placcd across the floor of the bomb trolley. When the gun is raised or lowered, great care must be taken to insure that the starboard extremity of the automatic loader does not catch on and damage...

Tests at Naval Proving Ground October to April

This gun, made at. the Naval Gun Factory, was delivered to the Naval Proving Ground on 30 October 1946. More than '1 weeks were used bv the firing officers in studying the weapon's construction and many peculiarities. The discussion of tests as given here is substantially as given in official reports. No editorial comment has been added. During the month's time interval just mentioned the longest burst was 16 rounds before a malfunction or serious breakage brought the tests to a halt. The most...

Acknowledgments

The help and encouragement received from many sources in the preparation of this work can never be fully acknowledged. The following persons are listed in at least partial recognition of the many contributions to the project. Rear Adm. M. F. Schoeffel, Chief of Bureau of Ordnance, Department of the Navy. Capt. C. K. Berlin, Assistant Chief of Bureau for Research and Division Director, and Capt. H. P. Weatherwax, Assistant Division Director, Rcscarch and Development Division, Bureau of Ordnance....

Aden

Machined into the sides arc seatings for the ejection assembly and the stud for the ejector actuating arm. The breech cylinder spindle is locked into position by the firing unit nut, which is, in turn, positioned by the tap washer and the cartridge retainer bolt. In the top of the housing are two recesses for the breech cylinder anti-rotation plunger and spring. One of the contact firing boxes is attached to the top of the housing by two quick-release studs, and at the rear of the...

Action of the Recoil and Recuperator Systems

When the gun and slipper recoil, the buffer cylinder, which is attached to the slipper, recoils with it while the piston, which is attached to the cradle, remains stationary. The piston head is at the rear of the buffer cylinder when the gun is in the firing position, the space in front of the piston head being filled with oil. During Recoil. The movement of the buffer cylinder causes the oil in front of the piston head to be forced through the longitudinal grooves in the buffer cylinder to the...

Mm Hispano Suiza Type

Engineers of the Hispano-Suiza Co. developed a more powerful cartridge for a 20-mm cannon and a more rugged mechanism to fire it, giving this version the official designation type 820. It was based, however, on the same principle as the well known and thoroughly seasoned original Hispano-Suiza action. The most important features on the refined weapon arc an initial velocity of 3,400 foot per second and a rate of fire in the neighborhood of 1,000 rounds a minute. These improvements were obtained...

Mg

2-6 Slide, drum revolving mechanism, and rammer of the German MG-213. Disassembled 2-7 Drum revolving mechanism and charging piston of the German MG-213 48 2-8 Receiver assembly of the German 2 -9 Parts of the German MG-213. Drum, drum housing, feed guide, and feed wheels. 49 2-10 German MG-213. Disassembled 2-11 Drum and feed mechanism of the German MG-213. Disassembled view 52 2-12 United States Ordnance Corps 20-mm Automatic Gun, T74, Model B 55 2-13 United States Ordnance Corps 20-mm...

Recommendations

Recommendations were 1 That if future tactical trends in combat aircraft demand a large caliber, automatically loaded gun, the principle of the 57-mm automatic loader be considered satisfactory for such use and 2 that the principle of the Mosquito 57-mm loader be considered for adaptation to the use of spin stabilized rocket or recoillcss cannon installations. Discussion of Tests of the 57-mm Gun Arrival of Equipment. The Mosquito airplane incorporating the 57-mm installation was delivered on...

Section mm automatic gun type tg

Figure 21-10. 20-mm Automatic Gun Type 5TG on a cone mount, for use as a light AA gun. Figure 21-10. 20-mm Automatic Gun Type 5TG on a cone mount, for use as a light AA gun. The 20-mm automatic gun type 5TG, developed after the closc of hostilities of World War 11, was the first Oerlikon gun design that differed radically from the original Becker design. The 5TG was first made with a drum feed. An Oerlikon Co. brochure describing the gun states that the gun can be adapted for pneumatic or...

Section Japanese Versions Of Oerlikon Mechanisms

In World War II, armed forces on both sides used Oerlikon automatic weapons. Most of these guns were based on the original Becker mechanism, although some details had been varied. In this group of weapons are the 14-mm Mod 14 Mark 1, the 20-mm type 99, and the 30-mm type 2. In the course of World War IT, there was one notable attempt to modify the Becker action, the caseless 40-mm HO 301, which was developed by Japan for her air force. Records indicate that beyond establishing the factor 7 and...

Examination Analysis and Study

Spectroscopic and wet chemical analyses were made to determine the type of steel used in the various parts of the weapon. Steel used in different parts of the 20-mm version corresponded approximately to United States specifications as follows Cartridge drum roller SAE 1020, carburized. Belleville spring Silicon manganese 0.90 percent carbon. Hardness Examination. Since the weapon had been damaged by fire, various parts were tested for hardness to determine the degree of...

Semag Gun Export

In 1927, Buehrle began buying into the Ocrlikon Machine Tool Works. By 1929, he was the principal stockholder and the number of employees had increased considerably. In the early 1930's, interest in cannon armament for aircraft was reviving, and Buehrle saw an opportunity to push the development of the 20-mm SEMAG. A German designer, Fritz Herlach, was hired to work on a new version of the gun. A salesman was employed to introduce the gun to foreign governments. The man selected for this work...

Marquardt

First showing of wooden mockup and demonstration of its operation. Demonstration of projector using live primer to ram round into gun chamber. CO used to eject case from chamber. Representatives were present from the Bureau of Ordnance, Bureau of Aeronautics, Naval Gun Factory, Dahlgren Proving Ground, and the War Department. 28 April. Demonstration and explanation for Chief of Bureau of Ordnance, and other officials of the Bureau. They were interested to know when manufacture of a...

And Recuperator Systems

Faults in the Recoil and the Recuperator Systems Air in buffer cylinder Insufficient oil Damaged gun slipper or cradle slides. . Gland packings too light Adjusting valve incorrectly set Damaged gun slipper or cradle slides. . Insufficient oil Adjusting valve incorrectly set Buffer too full Runout adjusting valve closed De fee live springs Slacken gland if oil leaks, exchange packing. Examine and repair remove obstructions. Push gun to firing position slacken gland. If oil leaks, exchange the...

General And Comparative Data Tables

2 Comparative Data Several 20-mm Automatic 2 Comparative Data MG-213 and Three Designs of the 20-mm 2 General Data Caliber .60 T130 Model 3 General Data Caliber .60 T45 Machine 3 Comparative Data Caliber .60 T45 Machine 4 General Data Caliber .60 TIB Machine 4 General Data Caliber .60 T17E5 Machine 5 General Data 75-mm Gun 5 General Data 75-mm Gun 5 Comparative Data 75-mm M6 and M9 Gun 5 General Data 75-mm Gun 6 General Data 20-mm Gun Mechanism MK 11 Mod 7 General Data 20-mm Machine Gun...

Illustrations

Frontis- In World War 11, Japanese warship receiving a fatal shot from a 75-mm aircraft piece 1-1 Method of assigning T numbers to ordnance items 4 1-2 Gun. Machine, Caliber .50 1-3 Gun, Machine, Caliber .50 1-4 Gun, Machine, Caliber .50 1-5 Gun, Machine, Caliber .50 1-6 Gun, Machine, Caliber .50 1-7 Gun, Machine, Caliber .50 1-8 15-mm Bendix Machine Gun. Top 1 -9 Gun, Machine, Caliber .60 110 Gun, Machine, Caliber .60 1-11 Gun, Machine, Caliber .60 1-12 Gun, Machine, Caliber .60 1 -13 Gun,...

Hmq

Weight increased to determine effect of slide weight on cyclic rate. Wcighl increase due to modification of slide for use with heavier spring . Recoil, Time-Displacement, and Trunnion Reactions. From a typical time-displacement record for two rounds, the cyclic rate was computed to be 1,206 rounds per minute. On the first round, the slide velocity during recoil was of the order of 48 feet per

Acceptance Test for First Frigidaire Made Guns

The initial procurement program for the T25E3 gun is described in the preceding section. An acceptance test was established for the 100 T25E3 guns delivered by Frigidaire during January and February 1945. Test specifications were as follows 1. Fire one high-pressure test round in cach gun. 2. Fire each gun 200 rounds in burst fire, 100 with right-hand and 100 with left-hand feed. If stoppages or breakages occur, rework guns and rcfirc. 3. Select 1 gun from each lot of 20 and fire 5,000 rounds...

Confidentialrevolver Cannon

German Mauser MG-213B, dosigned by Linder. Sectional view. The design was also called MG-213M, MG-215, and 7-43. Arrows indicate direction oi travel of parts during unlocking. Figure 2-2. German Mauser MG-213B, dosigned by Linder. Sectional view. The design was also called MG-213M, MG-215, and 7-43. Arrows indicate direction oi travel of parts during unlocking. lowed. Greatly improved barrel life was the result of a special process used in polishing the bore and chamber. The first...

Mbms

Feed mechanism of 30-mm British Aden Gun. Bottom view showing feed sprockets and link chute guide. Figure 18-6. Feed mochanism of 30-mm British Aden Gun. Bottom view showing a link entering the feed chute guide. As the gas piston moves to the rear, it comes into contact with the front face of the slide, drives it to the rear and compresses the return springs. During this movement, the breech cylinder is prevented from rotating until the slide has recoiled 1 inches. The cam lever...

Rheinmetall

By these methods the time required was reduced to a minimum from the day of development to the day of mass production. It was, of course, important that the finished experimental unit should resemble in every respect the future mass produced article, it was on this account necessary that the experimental plant should have at its disposal first class machines by means of which various kinds of production could be realized. Rhcinmetall was well equipped with physical, chemical,...

Types Of Types Of Firearms In The World

Automatic Cannon Types under development at the Oerlikon Factory since World War II. Top to bottom 20-mm Automatic Gun Type 5TG 20-mm Antiaircraft Gun Type 204 GK 30-mm Revolver Cannon 302 RK. Figure 21-7. Automatic Cannon Types under development at the Oerlikon Factory since World War II. Top to bottom 20-mm Automatic Gun Type 5TG 20-mm Antiaircraft Gun Type 204 GK 30-mm Revolver Cannon 302 RK.

Browning T25e1 Machine

Browning Frigidaire

Guns, and to expedite procurement of this weapon, the Army Air Forces requested its standardization in April 1945. Ordnance Committee action was immediately taken to standardize the T25E3 gun as Gun, Machine, Caliber .50 M3, Aircraft, Basic. Gun, Machine, Caliber .50 T26. Modification of the Browning M2 gun produced and tested at Aberdeen. Included a short-round device submitted by the Army Air Force and the cover assembly of the T22E5. The extractor assembly was also taken from the T22 series...

Ww

Gun, Machine, Caliber .60 T17E5. be conducted with a modification of the 20-mm Hispano-Suiza automatic cannon, M2. This modified 20-mm weapon was designated T18E1 because there had previously been made a gun called T18 which was a 20-mm automatic cannon, Ml, modified to fire the caliber .60 cartridge. The earlier gun was fed from a five-round magazine and served only to show that the action was sufficiently strong to fire the cartridge. Gu i, Machine, Caliber .60 T19. This...

Me

The purpose of this modification was to eliminate failures to charge out a misfired round in the B36 aircraft. However, although improvements resulted, tests showed the operation of the gun in charging to be marginal in the B36 and unsatisfacton' in other circumstances, and ail M24E2 guns would eventually be replaced by the M24A1. The charging failures experienced in the B36 aircraft caused double feeding, which not only put the gun out of action but also occasionally resulted in explosions...

Caliber Machine Guns

Model T17e3 Machine Gun

The first attempt to meet the characteristics for the caliber .60 aircraft machine gun was to modify a 20-mm Hispano-Suiza automatic cannon. 1'he receiver was identical and parts of the gun were interchangeable with the 20-mm, Ml. The chicf difference was in the barrel, which was chambered for the 20-mm ease, bored and rifled for the 15-mm bullet and fixed in relation to the mount. The whole gun was rigidly mounted and the muzzle brake and recoil mechanism used on the...

Section Mm Antiaircraft Gun Type Gk

The Oerlikon 20-mm antiaircraft gun type 204 GK is gas operated and features a centrally locked breechblock and belt feed. The kit can be fed into the gun as desired from the left or the right. The cartridge cases are ejected obliquely to the rear during the forward third of the breechblock travel. General Data 20-mm Antiaircra t Gun Type 204 GK Cun length without barrel 39.4 inches. Gun length including flame muffler 103.4 inchcs. Barrel weight with flame muffler 52.9 pounds. Weight of the...

Gun Theory

To arrive at a compact high-firing-rate gun mechanism that wrould be complete within itself so that no accessories would be required other than an electrical firing control, the following items were considered ncccssary 1. Use made of all available gun recoil energy to increase the firing rate. 2. A high ratio of rccoiling weight to total gun weight to reduce the reaction loads. 3. Weight reduced by use of high-strength aluminum alloys. 4. The gun to contain an integral charging system...

Description of the Weapon

Recoilless Cannon

The German High Command ordered the Rhein-metall engineers to explore the possibilities of developing a belt-fed automatic aircraft cannon based on the recoilless principle. At the end of hostilities, allied engineers found a device well along in the development stage. Officially called the MK-1 15, this unique weapon employed a locked breech but by means of diverting gases through an orifice, the recoil forces were cut to practically zero. A combustible cartridge case was used by this weapon....

Omn

More than 309 T17E3 guns had been manufactured and more than 950,000 rounds of ammunition of various types had been fired in them. Tests were continued to ascertain the life of the various components and to reduce the malfunctions. The principal components requiring early 1,000 round replacement are the. firing pin and the drive spring. Several types of these were then under development and test. Because the major components of the gun appeared to be serviceable for much more than 5,000 rounds,...

Description of Components

The cradle is the fabricated framework of the gun. Provision is made on the sides of the cradle for mounting the breech cylinder housing. At the rear of the cradle is a lug in which the feed mechanism anchorage pin engages. At the front of the cradle are two holes for anchoring the buffers. The cradle also accommodates the block, the cam lever guide, the return springs and rods, the feed mechanism, and the buffers. The Block. This part is riveted to the bottom of the cradle and...

Aden 25mm Revolver Cannon

Figure 18-2. 30-mra British Aden Gun. Cylinder housing Figure 18-2. 30-mra British Aden Gun. Cylinder housing Buffers. The buffers are situated between the front of the cradle and the front face of the breech cylinder housing. Assembled on the buffer spindle is the buffer housing. Between the spindle washer and the buffer housing plug are 29 Belleville washers, each 0.090 inch thick, in pairs. A single Belleville washer at one end is placed with its concave surface facing outward. Barrel. The...

Functioning of the mm Aden

30mm Aden Guns

Assume that a belt is in position and a round is in the firing chamber of the breech cylinder. When the firing switch is operated, the firing circuit is completed and the round is fired. The projectile passes from the chambcr into the barrel and the driving band forces the gas-sealing sleeve hard against the rear face of the barrel, thus sealing the chambcr and preventing loss of gas pressure. When the base of the projectile has passed the gas vent in the barrel, some of the...

Mm Machine Guns with Mark and Mod Numbers

40-mm Machine Gun Mechanism Mk I Mod 0. The design of these mechanisms and barrels is essentially that of the Swedish Bofors 40-mm antiaircraft gun. The design provides for a rapid fire, recoil operated, automatic mechanism, with a maximum cyclic rate of approximately 1G0 rounds per minute. The Mk 1 Mod 0 is a left-hand mechanism manufactured by York and is water cooled. 40-mm Gun Mechanism Mk 1 Mod L Left- hand mechanism manufactured bv Chrvsler. 40-mm. Gun Mechanism Mk 1 Mod 2. This is a Mk 1...

Assembly

To assemble the gun from subassemblies, follow this procedure 1. Replace the tube. Enter the breech end of the tube into the tube housing, taking care that the indicating arrow on the tube is to the top then give one-sixth turn in the clockwise direction, noting that the tube latch clicks in place. 2. Replace the bolt assembly. With the bolt unit in position and the cocking lever in the position for camming the action back, enter the unit into the receiver so that the crosspiece of the bolt...

A

Components of 277 10-1 Mclvin M. Johnson, Jr., inventor of the Johnson system of automatic weapons, 10-2 Senate Military Affairs Committee meeting of 2 July 1940. Left to right Senator Morr is Sheppa rd, Chairman of Committee Maj. Gen. George A. Lynch, Chief of Infantry standing, left Brig. Gen. R. C. Moore, Assistant Chief of Staff, United States Army Melvin M. Johnson, Jr. Senator A. B. Chandler seated far right . The Johnson semiautomatic rifle was discussed at this...

British Mm Cannon

British 57-mm Automatic Aircraft Cannon. Closeup view of automatic loader, with ammunition. Action of the Feed Mechanism During Recoil. When the magazine is loaded, the bottom round in the feed way is positioned with the nose of the shell resting against the retaining lever and the cartridge case resting against the release pawl link and displacing the bronze stop pawl. The round is retained in this position by the weight of the rounds above and the pusher arm, the second round in...

Operation

The cover should be closed before any firing is attempted. This also includes loading. Make certain that before the cover is closed, the bolt assembly is in its foremost position. This will insure that the stud on the drive bushing engages the socket in the top of the bolt. As a check on the correct position of the bolt assembly before closing the cover, the rear end of the bolt should be approximately five-sixteenths inch rearward of the end of the ejec- Figure 4-29. Method of inserting...