Free Active Duty Today for 1 Lucky Hog!

Gravelface said:
Who can tell me how to properly set the head space and timing on a .50 M2?
Click to expand...



Head space:
1. Raise cover all the way up, retract bolt to align barrel locking spring lug with 3/8” hole in right side of receiver.

2. With bolt retracted, screw barrel completely into barrel extension; then unscrew barrel two clicks. Allow bolt to go forward; barrel should not rotate.

3. Charge the weapon and allow the bolt to go forward. (Do not slam)

4. Retract the bolt until the barrel extension begins to separate (but not more than 1/16 inch) from the trunnion block. (DO NOT INSERT ANY OBJECT BETWEEN THE BARREL EXTENSION AND TRUNNION BLOCK). Hold in this position until gage check is completed.

5. Raise cartridge extractor; Push in on alignment guide to insert gage. (Apply slight pressure on gage). Attempt to insert “GO” end of headspace gage in the T-slot between the face of bolt and rear of barrel all the way up to the ring. If “GO” end of headspace gage enters down to the ring, attempt to insert the “NO GO” end of headspace gage; if “NO GO” end does not enter, headspace is set. If “NO GO” end enters T-slot or “GO” end does not enter, retract bolt to align barrel locking spring lug with 3/8” hole in right side of receiver.

6. Screw barrel in one click at a time (if “NO GO” end enters slot) or one click out at a time (if GO end does not enter) rechecking after each click starting from Step 4 above.

7. Repeat until “GO” end can enter T-slot and “NO GO” will not enter T-slot.



Timing:
1. Raise cover all the way up. (Do not hold barrel while charging weapon). Charge the weapon and allow the bolt to go forward. (Do not slam).

2. Retract bolt just enough to insert “FIRE” gage with beveled edge against barrel notches.

3. Remove backplate (pull backplate latch lock straight back, while lifting up on backplate latch. Raise backplate assembly straight up and remove from receiver).

4. Turn timing adjustment nut all the way down (to the left), but not completely off the timing stud.

5. Remove “Fire” Gage. Reinstall backplate. Insert “Fire Gage” and attempt to fire by pressing butterfly trigger; gun should not fire (firing pin not released).

6. Remove backplate, screw nut one click at a time. Reinstall backplate. Insert “Fire” Gage and attempt to fire by pressing on butterfly trigger (repeat procedure until the gun fires- firing pin releases).

7. After the gun fires, remove backplate, turn nut up two more clicks. Reinstall backplate, charge the weapon and allow the bolt to go forward. (Do not slam)

8. Retract bolt just enough to insert “NO FIRE” gage with beveled edge against barrel notches. Attempt to fire by pushing on the butterfly trigger; machine gun should not fire.

9. Retract bolt just enough to remove “NO FIRE” gage and insert “FIRE” gage with beveled edge against barrel notches. Attempt to fire by pushing on butterfly trigger; machine gun should fire. (Remove fire gage). Timing adjustment is complete.


Hooray for me! :D
 
Scale says 292.6

Just do proper rounding how we all learned in 5th grade.

293 is you answerand your winner.

Just one pork rind's humble opinon...

YMMV
 
Well, you and Deadhead are the closest......need something for the pair of you to guess over?!
 
GlassJax said:
Scale says 292.6

Just do proper rounding how we all learned in 5th grade.

293 is you answerand your winner.

Just one pork rind's humble opinon...

YMMV
Click to expand...

I agree with GlassJax on this one... 292.6 is closest to 293, plain and simple. :)

.
 
ColdOne said:
Head space:
1. Raise cover all the way up, retract bolt to align barrel locking spring lug with 3/8” hole in right side of receiver.

2. With bolt retracted, screw barrel completely into barrel extension; then unscrew barrel two clicks. Allow bolt to go forward; barrel should not rotate.

3. Charge the weapon and allow the bolt to go forward. (Do not slam)

4. Retract the bolt until the barrel extension begins to separate (but not more than 1/16 inch) from the trunnion block. (DO NOT INSERT ANY OBJECT BETWEEN THE BARREL EXTENSION AND TRUNNION BLOCK). Hold in this position until gage check is completed.

5. Raise cartridge extractor; Push in on alignment guide to insert gage. (Apply slight pressure on gage). Attempt to insert “GO” end of headspace gage in the T-slot between the face of bolt and rear of barrel all the way up to the ring. If “GO” end of headspace gage enters down to the ring, attempt to insert the “NO GO” end of headspace gage; if “NO GO” end does not enter, headspace is set. If “NO GO” end enters T-slot or “GO” end does not enter, retract bolt to align barrel locking spring lug with 3/8” hole in right side of receiver.

6. Screw barrel in one click at a time (if “NO GO” end enters slot) or one click out at a time (if GO end does not enter) rechecking after each click starting from Step 4 above.

7. Repeat until “GO” end can enter T-slot and “NO GO” will not enter T-slot.



Timing:
1. Raise cover all the way up. (Do not hold barrel while charging weapon). Charge the weapon and allow the bolt to go forward. (Do not slam).

2. Retract bolt just enough to insert “FIRE” gage with beveled edge against barrel notches.

3. Remove backplate (pull backplate latch lock straight back, while lifting up on backplate latch. Raise backplate assembly straight up and remove from receiver).

4. Turn timing adjustment nut all the way down (to the left), but not completely off the timing stud.

5. Remove “Fire” Gage. Reinstall backplate. Insert “Fire Gage” and attempt to fire by pressing butterfly trigger; gun should not fire (firing pin not released).

6. Remove backplate, screw nut one click at a time. Reinstall backplate. Insert “Fire” Gage and attempt to fire by pressing on butterfly trigger (repeat procedure until the gun fires- firing pin releases).

7. After the gun fires, remove backplate, turn nut up two more clicks. Reinstall backplate, charge the weapon and allow the bolt to go forward. (Do not slam)

8. Retract bolt just enough to insert “NO FIRE” gage with beveled edge against barrel notches. Attempt to fire by pushing on the butterfly trigger; machine gun should not fire.

9. Retract bolt just enough to remove “NO FIRE” gage and insert “FIRE” gage with beveled edge against barrel notches. Attempt to fire by pushing on butterfly trigger; machine gun should fire. (Remove fire gage). Timing adjustment is complete.


Hooray for me! :D
Click to expand...

Ha... I sent Gravelface an email with the exact same thing about 10 mins ago ;)
 
They could guess how many olives in my gin salad.

But that is kind of changing as time goes on...

And do the cocktail onions count?

Maybe not the best idea...
 
should the head space on the .50 Cal machine gun be checked?


-Before firing


-After the gun is assembled


-After replacing the barrel or receiver group


-When there is doubt that correct head space is set


18. Head space adjustments on the .50 Cal machine gun is correct when what conditions are met?


-The recoiling groups are fully forward


-There is no independent rear ward movement between the bolt, barrel, and barrel extension


-The no-go gauge does not fit in the T-slot, and the firing gauge does fit


19. What is the importance of current head space adjustment on the .50 Cal machine gun?


Improper head space adjustment can cause improper functioning of the gun and, frequently, damage to parts and/or injury to personnel


20. Timing on the .50 Cal machine gun is correct when what conditions are met?


-Firing takes place when
 
How do you post a poll.....some one ...help


1 school of thought...Price is right ...nearest without going over.
2 Round to the nearest whole number.
 
Lil' Foo said:
I agree with GlassJax on this one... 292.6 is closest to 293, plain and simple. :)

.
Click to expand...

I have to agree, I don't think I have ever seen a bathroom scale split a hair like that. Of course, I try and stay the hell away from scales of any kind. :D It just depresses me.
 
Come now Cold One......it is between Pit man and Dead Head......

ProG. I can draw blood pinching with that fat monkey toe!!!
 
You must log in or register to reply here.
Back
Top