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DODAr CAREFULLY

UNO serial number 0257

UNO proper shipping name Fuzes, detonating

Explosive Components:

. J£to°iult0r M47' Relay M11- and Detonator XM87.

Limitations:

None.

References:

SC 1340/98-IL TM 9-1300-251-20 TM 9-1015-203-12 TM 9-1015-234-10 TM 9-1025-200-12&P TM 9-2300-216-10 TM 9-2350-311-10

40mm Fuze Head

Type Classification:

Std AMCTC 9575 dtd 1972.

Use:

Mechanical Time Fuze M571 is designed es- pecially for use with 105mm flechette-loaded Cartridge M494.

Description:

The fuze consists of an aluminum head, a lower cap containing the timing movement, a body and a detonator holder plug assembly. The rotatable lower cap is inscribed with range graduations in meters and a muzzle action mark for alignment as required with a zero mark on the body. The fuze as issued is set for muzzle action, but any desired range between 200 and 4400 meters can be preset by hand. The movement assembly in the lower cap is a spring-driven clockwork mechanism combined with a muzzle action feature activated by four setback pins and two centrifugal weights (not shown in illustration), utilizing the same firing pin as the time mechanism. The detonator holder located in the fuze body above the closing plug contains Detonator XM87. An interrupter between Relay M7 at the upper end of the body and Detonator XM87 consists of two overlapping centrifugal weights.

Functioning:

Muzzle Action: Setback upon weapon firing causes the setback pins to move downward and allow centrifugal force to move the weight above the timer, uncovering a notch in the timing disk. At the same time, centrifugal force moves aside the weights between Relay M7 and Detonator XM87 in the base. With the notch in the timing disk uncovered, the firing arm slides inward and turns, permitting the spring-loaded pin to strike Detonator M47 and initiate the explosive train. Detonation occurs immediately when the projectile leaves the muzzle.

Range ^ Action: Turning the lower cap to Upper limit ------------------------ + 125°F

set the tlming, simultaneously rotates the tim- Storage:

ing disk by means of a setting pin lodged in an Lower limit-------------------------80°F (for not ug on the disk. Setback permits a more than 3

hammer spring to strike the upraised lug, thus days)

releasing the disk from the setting pin. Upper limit----------------------+ 160°F (for

Centrifugal force releases the timing move- not more than ment. When the disk has turned the preset 4 hr/day)

time, the disk notch engages the firing arm. Packing ------------------------------ Shipped assem-

The firing arm turns to allow the firing pin to bled to round strike the detonator as above. The fuze is designed to function for optimum payload dis- Shipping and Storage Data: persion for the range set. If preset for 200 to

500 meters, the fuze will function 100 meters DODAC -------------------------------- 1390-N247

short of the preset range; between a set range of 600 to 4400 meters, the fuze will function 75 Explosive Components: meters short of the preset range.

Detonator M47, Relay M7 and

Firing overhead of exposed friendly troops

Assembly Dwg. No--------------- 10551670 take cover.

remperature Limits: Reference

Firing: TM 9-1300

Safety Cap Fuze

Type Classification: Use:

Mechanical Time Fuzes M592 series are designed especially for use with flechette-Ioaded 106mm Cartridge M581.

Description:

The fuze consists of an aluminum head, a lower cap containing the timing movement, and a steel body containing a detonator holder and plug assembly The rotatable lower cap is in scribed with range graduations from 200 to 3300 meters and an MA mm-k for muzzle action, The movement in the lower cap is a spring-driven clockwork mechanism combined with a muzzle-action feature activated by setback and centrifugal force, and uses the same firing pin as the time mechanism. The detonator holder located in the fuze body above the closing plug contains Detonator XM87. Two overlapping weights between Relay M11 at the upper end of the body and Detonator XM87 are moved by centrifugal force and constitute an interrupter-type safety provision.

Functioning:

Muzzle Action: Setback upon weapon firing causes the alpha weights (XM592) or the setback pins (M592) to move downward and allow centrifugal force to move the weight above the timer, uncovering a notch in the timing disk. At the same time, centrifugal force moves aside the weights between Relay M11 and Detonator XM87 in the base, With the notch in the timing disk uncovered, the tiring arm slides inward and turns permitting the spring-loaded firing pin to strike Detonator M47 and initiate the explosive train. Detonation will occur immediately when the projectile leaves the muzzle.

Timed Action: Turning the lower cap to set the fuze, simultaneously rotates the timing disk by means of a setting pin lodged in an upraised lug on the disk, Setback allows a hammer spring to strike the upraised lug, thus releasing the timing disk from the setting pin, Centrifugal force releases the timing movement. When the timing disk has turned the preset time, the disk notch engages the firing arm, The firing arm turns to allow the firing pin to strike the detonater as above. If set for range, the fuze will function approximately 125 meters prior to range setting (optimum standoff for payload dispersion).

Difference Between Models:

Fuze XM592 uses four alpha weights to provide arming for the muzzle action feature. In Model M592, the weights are replaced by setback pins.

Tabulated Data:

Length:

Temperature Limits:

Firing:

Storage:

Lower limit------------------------80°F (for not more than 3 days)

Upper limit------------------------+160°F (for not more than 4 hr/day)

*Packing ---------------------------- 8 fuzes in metal container; 2 containers in wire-bound box

*NOTE: See DOD Consolidated Ammunition Catalog for complete packing data including NSN's.

Shipping and Storage Data:

Storage compatibility group-----B, E & N

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