December 26, 2007 at 4:38 pm #1117
PICTURES OF INTERNAL MECHANISM OF MY LATEST HOMEBUILD GUN:
TRIGGER MECHANISM DRAWING:
TRIGGER PARTS (OOPS! THE SEAR IS POSITIONED BACKWARDS IN THIS PHOTO):
SAFETY SHAFT AND LEVER (notice the groove and detent holes in the safety shaft – the spring plunger riding in this groove retains the safety shaft in its hole – the detent holes make the safety click on/off):
FRAME CUTOUT FOR TRIGGER PARTS:
THE SCREW DRIVER IS ON THE SAFETY SPRING PLUNGER:
THE SEAR IN THE UPRIGHT POSITION (COCKED AND HOLDING THE HAMMER BACK):
TOP VIEW OF SEAR:
LOOK AT THE THREADED HOLE FOR THE SAFETY SPRING PLUNGER (its the thing to the left of the spring, in the foregroung):
SEE HOW THE SEAR HOLDS THE HAMMER BACK:
THE NOTCH IN THE BREACH PROVIDES ROOM FOR THE SEAR TO ROTATE UP AS THE HAMMER IS COCKED:
HAMMER AND BREACH:
NOTICE HOW THE SEAR PROTRUDES THROUGH THE SLOT IN THE TUBE:
ALL OF THE PARTS:
December 26, 2007 at 7:14 pm #30222darkfrontParticipant
Very nice work! I’m curious though, how does the trigger feel? Maybe I’m not looking at it right, but it looks like it rolls more than it breaks. Does it take getting used to?December 26, 2007 at 7:28 pm #30223miltonbradlyParticipant
Cool setup, I’m curious about that trigger feel too.
I’m planning a similar safety setup but with a secondary sear similar to the stock one and the safety acting on the secondary lever so it is closer to the grip.
MBDecember 26, 2007 at 7:47 pm #30224
I am no expert at triggers, but it feels good to me. Without the return spring plunger, it lets go with about 1.5 pounds. The rerurn spring plunger adds another 2 pounds. It seems to let go suddenly, no takeup, or creep. I think the lock time is good also. That sear has very little inertia, and I expect it rolls out of the way real quick.
The trigger and sear are hardened to rockwell 48 C (quite hard!), so they will hold a sharp edge, and not round over.
The notch depth between the sear and trigger notch is about .030 inch.
The trigger piviot pin is positioned so that it results in about .020 inch of trigger travel.
Trigger overtravel is controled by the position of the trigger return spring plunger. The trigger bottoms out aganist the spring plunger housing. If you screw it out, you get less overtravel.
The safety is not automaticaly setting. Its in such a good position, that it is a natural thing to cock, set the safety, then load a pellet. When ready to fire, the safety can be easily released with the trigger finger (although it is just a little bit too far forward).
MarkDecember 26, 2007 at 7:56 pm #30226
Your secondary sear holds the hammer back or blocks the trigger? I am very interested in alternate trigger / safety arrangements.
I’am winging it on this trigger stuff, and trying to learn as I go.
My safety actualy applies an upward pressure under the trigger lever, by camming action. There is no way the sear is gonna fall with this camming pressure.
Got any pictures or drawings?
MarkDecember 26, 2007 at 8:08 pm #30227
These trigger parts look complicated, but they are not that bad. I started with 5/32 inch thick by 3 inch wide ground flat stock. The flat stock is A2 tool steel. I laied out the shape, then rough cut it out with a band saw. Then cut to the layout lines with the mill.
Later after everything was fitted and to its final shape, I heated the A2 steel to cherry red (with nothing more than a propane torch – burns-omatic ) and held it red for 3 minutes. Let it air cool and it gets real hard. No special tools or heat treating procedures.
The ground, flat stock, A2, steel is kinda expensive — about $35 for a piece 3″ by 18″ by 5/32. http://www.use-enco.com has the A2 tool steel.
MarkDecember 27, 2007 at 12:27 am #30238rabbitsParticipant
now this si what i call a craftsman welldone mate and keep them pics comeing your doing some very nice work and i,m sure i,m speeking for a good few off us thanks for shareing your work 😀December 27, 2007 at 12:53 am #30242jezxParticipant
nice picturs again , i wish you’d posted this about 2 weeks ago , i had just started building similar guns , i have one almost done ill post some pic’s as well once i get to the point your at .
your trigger looks 20x better then the first set up i did .lol.December 27, 2007 at 1:32 am #30249
Cant wait for your pictures! This one is my 4TH try at a trigger, and I’am still learning.
Good luck on your build!
MarkDecember 27, 2007 at 1:33 am #30250
Thanks Rabbits!!December 27, 2007 at 1:07 pm #30267rabbitsParticipantquote MM123522:
credit were credit is due buddy welldone again 😀December 30, 2007 at 12:41 am #30500blackopsParticipant
That is flipping amazing!
Thanks for sharing all this info, your project is amazingly cool.
Do you use any kind of spring guide to keep it centered in the bore? does the hammer go it for you?
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