Examination Analysis and Study
Metallurgical 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...
Confidential Snj
7. Remove burs from push rods. Replace if excessively peened on the ends. Cleaning, inspect and clean carbon from the vent plug and piston ring after firing frequently. 1. Remove the cotter pin and lockwasher. 2. Unscrew the sleeve guide from the receiver lug. 3. Remove the trunnion securing screws through the gas cylinder bracket. 4. Remove the gas cylinder sleeve bracket. 5. Remove the cotter pin from the gas bracket screw. 6. Unscrew the castellated nut and slide out the as bracket screw. 7....
The Machine Gunconfidential Xrz
Figure 23-2. 23-mm Madsen Automatic Aircraft Cannon. Disassembled view. tests at both placcs were discouraging, and the United States Government lost interest. Illustrations and discussion of developments to this date are included in The Machine Gun, volume 1, pages 537-54 and 570. It is reported through official channels that after World War II this Danish company experimented with captured German weapons that had been under development at the Mauser and Rhcinmetali manufacturing activities....
Confidential Pqm
The cam then was modified to reduce the steepness of the cam curves. This resulted in smoother action, normal slide travel, and increased cyclic rates. Tests were then conductcd with the feeder and new experimental links, manufacture of which had just been completed. The initial test resulted in only 3 inches of slide travel and jamming of the mechanism caused bv interference between the ram-mer and the third link. Inspection of the links revealed that thev did not conform to the drawings. The...
Confidential Krg
Figure 1-42. 37-rmii Browning Gun T20 with barrel removed. Right side view. pounds. Both charging and firing gun were to be by remote control and the feed was to be bv a dis-integrating link belt, or, as a second choice, the belt or magazine. Firing was to be at the highest cyclic rate possible. Gun, Automatic 37-mm '120. In the spring of 1942 Oldsmobile under Ordnance Department contract instituted a study of the redesign of the 37-inm antiaircraft automatic gun M1A2 to adapt it to fulfill the...
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
21 April. 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...
Te Cwy
T9E3 , 163 Aircraft Guns Test an I Evaluation Procedures Alcoa hand Allen, Henry B 290,297 Allied Technical Intelligence sendees. . 551 Alpha Engineering and Machine Works 152 Altman, Alfred . Aluminum, in large gun components. . 171
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...
Confidential Ial
General Data 30-mm SG-117 and 30-mm SG-1181 Barrel removal Not quick disconnect. System of operation 7 barrels grouped together, fired System of locking Rigid. Whole un t glides back and fires by contacts along rail that is mounted Method of headspace Factory established.
Confidential Gkr
AP, 2 pound 460 British, cal. .50 cartridge 4 British type 30-mm 263 Cal. .60 420 Externally lubricated 229 High-velocity 20 Hispano-Suiza 27, Ocrlikon 188, 195, 292, 302, 548 Proof, 20-mm 212 20-mm, calibrated standard M97. . . . 212 Waxing of 395,406 Antidouble feed device'5 405 Anti-Kamikaze 408 Armastccl 316 Armour aircraft automatic cannon 231-264 Table of, and related models 235 M24 series 407 MG-213 Mauser 20-mm revolver cannon 45,51
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,...
Shirgun Bdw
Because to the date of this work it had been necessary for all known 20-mm cannon to use externally lubricated ammunition, hot oily cases further created an explosive hazard, since all empty brass must be retained in the fuselage of jet planes. As gas operation is impractical under these conditions and since the short recoil principle has proved successful in guns of smaller caliber, it was decided to adapt it, if possible, to the 20-mm. Short-recoil operation utilizes the energy of the...
I 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 FrigidaireMade 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...
Info Ugs
1 A seven-milliseconds delay of second round primer deducted. It was anticipated that addition of the gage would increase pressure and therefore velocity, in view of the change in density of loading. However, it appears that the pressure of the gage is suppressing, possibly through ignition interference, since an average velocity decrease of approximately 25 feet per second was obtained with the gage round. The reduced bullet-pull caused by disassembly and reassembly of the round could also...
Confidentialrevolver Cannon
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. 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...
Confidential Rgf
Figure 12-11. 37-mm Gun M9. Sectional view. latch assembly feedbox and feeding mechanism driving spring tube guards recuperator group trunnion block group. Manual Charger Assembly. A manual charger assembly known as the 37-mm charger M3 is attached to either side of the gun by four e-inch cap screws. This assembly consists principally of a longitudinally slotted tube fitted with two mounting brackets and enclosing a coil spring and plunger. The plunger is fitted with a projecting shoe which...
Mbms
Figure 18-5. 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
mass production. 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
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. 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.
Colt Mm Cannon Qbf
Figure 9-16. 20-mm Gun T24. Components of feedway. Figure 9-16. 20-mm Gun T24. Components of feedway. Between 14 February 1945 and 24 August 1945, 40 test rounds were fired from the T24. These rounds are described in detail in paragraphs which follow. Tests were conducted at the Colt plant except as otherwise noted. The 20-mm T24 gun is chambered to take the 20-mm cartridge of 3,500-fcct-per-sccond velocity, and the first firing of this gun took place on 14 February 1945. Ammunition used was...
Browning T25e1 Machine Gun
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
Figure 1-11. 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...
Confidential Tqd
Figure 25-23. 5-cm BK Automatic Aircraft Gun. Right rear view. Figure 25-23. 5-cm BK Automatic Aircraft Gun. Right rear view. On cach side of the cradle and beneath the magazine, there are air bottles which contain the compressed air supply to operate the gun. The air is metered to the proper piston through one of three electrically-operated valves. There are six electric switches which complete the circuits to operate the valves at the proper time. The main switch is operated by a lever in the...
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...
Confidential Alc
changeable, but differ only in that, they arc mirror images of each other. Enclosed in the feedbox are the following principal parts feed lever feed crank feed-slide lever feed slide and feed pawl feed-slide return lever cartridge feeder stop and holding pawls stripper cam carrier assembly and carrier catch loading lever and spring interlock trigger and trigger operating arm feedbox cover. Attached to the feed-box is the external stop pawl assembly and part of the trigger mcchanism. A feed...
Caliber Machine Guns 1
Bendix 5-mm 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...
confidential Hmc
Figure 21-8. Aerial view oi the Oerlikon factory in Switzerland. Figure 21-9. Oerlikon 30-mm Automatic Cannon Type 301 FK, a postwar design that was discarded in the development sfage. Figure 21-9. Oerlikon 30-mm Automatic Cannon Type 301 FK, a postwar design that was discarded in the development sfage.
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...
Confidential
Figure 1-15. Gun, Machinc, Caliber .60 T41. Closeup view of modified barrel showing gas assist port. Figure 1-15. Gun, Machinc, Caliber .60 T41. Closeup view of modified barrel showing gas assist port. Figure 1-16. New or modified parts used in the conversion of the CalibeT .60 T17E3 gun to the Caliber .60 T41. Figure 1-16. New or modified parts used in the conversion of the CalibeT .60 T17E3 gun to the Caliber .60 T41. Gun, Machinc Caliber .60 T45. Motor-driven machine gun with several barrels...
Description of the Weapon Usw
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....
X 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,...
The Machine Gun Ulg
With the sleeves and charging chambers thus positioned, move the breech away from the pneumatic tank until the sleeves and the charging chambers clear the two pneumatic tank extensions. Remove the sleeves and charging chambers from the breech by grasping the charging chambers and pulling outwards. The charging chambers also serve as retainers for the ejection and coolant tubes, therefore, the removal of the chambers permits the separation of the breech from the pncumatic tank. 7. After...
Description of Components Isb
The Cradle. 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 Gun
Recoil Action. 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...
Description of the Weapon Bqs
Design requirements for the G-104 Gerat-104 or Device-104 , which were set up by the German Air Ministry, specified that it be a recoilless gun somewhat similar to the MK-113 but capable of firing a 1,400-pound projectile from an airplane. The principle of this recoilless system involves making the weight of the cartridge case equivalent to the projectile and discharging the heavy case from the rear of the gun. The tube is rifled its entire length with a right-hand twist, and the projectile and...
the machine gun Pan
bers and feed are referred to as No. 1 through No. 5 in counterclockwise order from the round in firing position. Rounds No. 1 and No. 2. Projectiles were found to be from zero inch to 0.060 inch forward of original position in the case. Any looseness present was within the above limits of movement. These rounds were fully chambered and contained markings on the base of the case made by the forward face of the rammer. Round No. 3. This round had been stripped from the link in the initial stage...
Confidential Pzk
to move forward with the firing pin. The necessary energy is provided by the iiring-pin spring. The firing pin strikes the primer of the cartridge, firing it and starting the cycle all over again. To stop firing the gun, release the trigger mechanism. The sear is forced upward by the sear spring. This engages the underneath side of the piston rod and blocks the forward motion. General To facilitate complete disassembly and assembly, the procedure as outlined in the following paragraphs should...
Assembly Xvx
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...
Mg 1
4 5 Gun, Machine, Caliber .60, T17E1. Top 4-6 Gun, Machine, Caliber .60, 4-7 Gun, Machine, Caliber .60, T17E5. General assembly of 4-8 View showing how belt feed rack is moved outward during counterrecoil 124 4-9 View showing how belt, feed rack is moved inward during 4-10 View showing engagement of belt feed tube and 4-11 View showing how cartridge is held alined in 4 12 View showing how backward movement of belt is prevented when rack shuttles. - 126 4-13 View showing how belt feed pawl...
The Machine Gunconfidential Tvn
Figure 7-2. The codesigner of the Shirgun, Ernest Rosmarin. lottenburg was the residence of Hans Lauf, designer of the L. H. 33 gun. See vol. 1, p. 469. In July 1942, the Bureau of Ordnance initiated a project to develop a 2 -mm aircraft gun to have a low silhouette for use in thin wing.aircraft then being planned. Weight was not considered an important characteristic. The original design characteristics were based on utilization of Oerlikon ammunition. In 1943 the Navy Department contracted...
A
9-16 20-mm Gun'124. 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...
The Machine Gun Confidential Wfr
Figure 21-12. Cycle of operation of 20-mm Automatic Gun 5TG. Top to bottom cocked counterrecoil and feed ignition Figure 21-12. Cycle of operation of 20-mm Automatic Gun 5TG. Top to bottom cocked counterrecoil and feed ignition
British Mm Cannon Wej
Figure 17-4. 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
1. 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...