Has anyone had to rebuild a sear?
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Has anyone had to rebuild a sear?
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Topic: Has anyone had to rebuild a sear? (Read 3835 times))
rr_shooter
Shooter
Posts: 48
Real Name: Paul
Has anyone had to rebuild a sear?
«
on:
March 09, 2012, 02:30:39 PM »
I have a TF-97 on which I was performing a trigger polish, and evidently went too far in my efforts. The sear and the top of the trigger no longer engage (see sketch below). I've found that by shimming the top of the sear where it rests against the receiver tube (B), I've rotated the sear enough to where it now engages the trigger. Right now, I have that area shimmed with a thin layer (~ 1/16" - 1/32") of J-B Weld (I know, it's not the best solution, but I wanted to see if I could at least get the thing to work again).
My concern is that the overlap of the sear and piston (C) is now reduced by the amount that I have shimmed the sear. How much is left? I have no idea - all I can do is a vigorous bump test.
The obvious solution would be to replace the parts, but that has been a dead-end so far. I bought the rifle from Compassecco, so they're no longer able to help. I've been unable to get through to Pyramyd today on the phone, but they don't list any parts for the TF rifles on their Web site, so I presume they would not be able to help, either. I contacted Mike Melick last month, and he sent me some parts from a 46U, as the trigger group looked similar. Unfortunately, the sear from the 46U is too short and will not fit. I haven't found any other dealer for TF products (specifically the TF-97) in the States. Therefore, it looks like I need to try to repair the parts I have.
Instead of shimming at (B), I'd rather address the problem correctly and build-up the surface of the sear at (A). Here's my question - what is the best material to use in this situation? Can I get something welded on? It would have to be very thin material. Would a weld bead itself built-up on the sear hold out? Obviously this is an area that would be subjected to shear. I'm not a "metals" guy and I'm looking for some help. Any suggestions would be greatly appreciated!
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DMikeM
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Re: Has anyone had to rebuild a sear?
«
Reply #1 on:
March 09, 2012, 03:00:09 PM »
Did it once on a .22 powder burner but ended up with a fully automatic gun. Ordered a replacement and wont do it again.
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Shooter
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Re: Has anyone had to rebuild a sear?
«
Reply #2 on:
March 09, 2012, 03:01:17 PM »
Have one machined from the original. Just add a few thousands on the sear. but, it may be too costly.
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bambazonke01
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Re: Has anyone had to rebuild a sear?
«
Reply #3 on:
March 09, 2012, 03:50:47 PM »
If you have welding done the weld metal can be harder than the original parent metal. It would be better if you just made a new one
Jim
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Kailua
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Real Name: Paul
Re: Has anyone had to rebuild a sear?
«
Reply #4 on:
March 09, 2012, 03:58:47 PM »
I have used a arc welder to build up a shear. Just had to tack weld and cool to add material. Used a 6011 3/32 electrode. Had reshaped it then heated contact part cherry red then dipped it in engine oil. Has been good for a few thousand rounds.
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Mark 611
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Re: Has anyone had to rebuild a sear?
«
Reply #5 on:
March 09, 2012, 03:59:04 PM »
well I'll tell ya JB weld or a weld my not fix it! because believe it or not the weld material is to soft and will wear away I know because I've done this before you'll just need to get a new part!
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Paul68
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yes
Re: Has anyone had to rebuild a sear?
«
Reply #6 on:
March 09, 2012, 04:12:59 PM »
I'd get a piece of sheet steel, trace out the old one, and begin the fun process of cutting it out and shaping a new one. Seems intimidating at first, but really just time consuming if you go slow. A dremel, flat and triangle file, and some sandpaper can do more than you'd think. Doing a simple B2 trigger the same way, and the results are surpisingly decent. Only other real option that would last would be to weld some material on and reshape it, which honestly sounds simpler than making a new one.
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william71743
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Re: Has anyone had to rebuild a sear?
«
Reply #7 on:
March 09, 2012, 05:24:49 PM »
I'd be more inclined to make a new one, like paul68 described, or maybe find one close enough that I could make it work (fit). It'd be interesting to see what input Charlie DaTuna might have here also. Good luck with what ever you decide to do.
«
Last Edit: March 09, 2012, 05:30:20 PM by william71743
»
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Paul68
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yes
Re: Has anyone had to rebuild a sear?
«
Reply #8 on:
March 09, 2012, 06:33:01 PM »
Something like this, you might even be able to get one of the better equipped guys here to machine one for ya.
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Fisherdude
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Re: Has anyone had to rebuild a sear?
«
Reply #9 on:
March 09, 2012, 06:34:30 PM »
I presume you contacted PA about purchasing a new part - that would be the easy way. If that doesnt work it will have to be welded up or a whole new part made from a piece of steel.
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CharlieDaTuna
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Re: Has anyone had to rebuild a sear?
«
Reply #10 on:
March 09, 2012, 08:14:22 PM »
Yep.... heard this story many times...
You really do need to be very careful about either taking too much off and/or changing the profile and both are very easy to do. I too have done it many years ago but it only took a couple of times to learn.
A new one would of course be the best way to go if available. If you make a new one it should be out of hard metal and it wouldn't be very hard if you have or have access to a milling machine.
That said though, I wouldn't be afraid to tig weld a little on the surface and shape it. Relatively quick and nothing to loose. Be sure to make a pattern though. I would either trace it out using a sharp pencil or fine point pen so you can get an idea where you stand as you finish it up. Either that or mic it for a measurement. There is not a whole lot of pressure applied there and the weld would be hard. Then after a couple hundred shots or so, take a look at it and see what the wear looks like just to be sure that it's holding up ok.
CDT
«
Last Edit: March 09, 2012, 08:15:56 PM by CharlieDaTuna
»
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rr_shooter
Shooter
Posts: 48
Real Name: Paul
Re: Has anyone had to rebuild a sear?
«
Reply #11 on:
March 09, 2012, 08:38:25 PM »
Thanks for all the suggestions, guys! Haven't tried to get through to PA since my last post. If they have no parts, I think I'll try to get someone to do a little welding for me, and in the meantime I may pursue the back-up plan of making one from scratch by hand. The original is three layers of steel sandwiched together - I may end up with something better than the original.
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cheerIO
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Re: Has anyone had to rebuild a sear?
«
Reply #12 on:
March 10, 2012, 04:06:32 AM »
Pretty sure making a new one is going to be easier than you think. A drill press for the hole, a good vise and a good file and you should be done within the hour.
Drill the holes for the slot when the piece is big so you have more to grab on to and clamp a guide piece of steel to the table so you can slide the part along while you drill the holes. That way the slot will be straight.
And be sure to have a file card/brush handy to clear the file.
Good luck. You'll love the gun even more after you've hand made integral parts for it.
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uncle paulie
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Real Name: Paul
Re: Has anyone had to rebuild a sear?
«
Reply #13 on:
March 10, 2012, 09:25:02 AM »
As said, not too difficult to make a new one, but if you want to reuse the old one, I have had good success in a similar instance by getting an old-school, auto points feeler gauge and silver soldering the required material on the original. They are steel and should hold-up for a good long time. Or at least until you can locate a replacement for the entire piece.
Good Luck!
pv
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rr_shooter
Shooter
Posts: 48
Real Name: Paul
Re: Has anyone had to rebuild a sear?
«
Reply #14 on:
March 11, 2012, 08:55:34 AM »
GREAT idea about the feeler gauge, Paul! Tough metal and it already comes polished!
Creative thinking is what makes this forum great - thanks again for all the replies.
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Has anyone had to rebuild a sear?