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Sear angle fixture design (Read 2226 times)

oldstarfire Participating Member Offline Posts: 40 Location: Center of Canada Joined: Jan 17^th, 2016	Sear angle fixture design Nov 9^th, 2021 at 10:07pm	Print Post
	Shoulda flagged it, but didn't. Somewhere (here??) saw a posting about a fixture someone made to file sear angle accurately. I think it worked for hammer notches, and trigger sears. Anyone remember, or made it, or has a fixture they use?? TIA!


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GT Frequent Elocutionist Offline Posts: 2368 Location: Northeast Wyoming Joined: Jun 28^th, 2015	Re: Sear angle fixture design Reply #1 - Nov 9^th, 2021 at 11:17pm	Print Post
	I have one I made for 1885 hammer sear engagement stoning. Doesn't work for the sear itself but it wouldn't take much to alter the design and make one fit the sear. It wasn't my design originally, I saw a picture of one somewhere and copied the idea, working on a couple more for different hammers...

	"To invent, you need a good imagination and a pile of junk" T. A. Edison "The trouble ain't that there is too many fools, but that the lightning ain't distributed right" M.T.
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uscra112 Frequent Elocutionist Offline Posts: 4079 Location: Switzerland of Ohio Joined: May 7^th, 2007	Re: Sear angle fixture design Reply #2 - Nov 10^th, 2021 at 4:42am	Print Post
	Here's one I cobbled up for Stevens 44 hammers. Should also work for the 44-1/2. Drawing available if wanted.

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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: Sear angle fixture design Reply #3 - Nov 10^th, 2021 at 7:14am	Print Post
	(You need to *Login* or *Register* to view media files and links)

	" It Is Better To Now Have Been A Has Been Than A Never Was Or A Wanna Be "
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hepburnman Senior Forum Member Offline Posts: 402 Location: NJ Joined: Mar 22^nd, 2015	Re: Sear angle fixture design Reply #4 - Nov 10^th, 2021 at 8:59am	Print Post
	GT wrote on Nov 9^th, 2021 at 11:17pm: I have one I made for 1885 hammer sear engagement stoning. Doesn't work for the sear itself but it wouldn't take much to alter the design and make one fit the sear. It wasn't my design originally, I saw a picture of one somewhere and copied the idea, working on a couple more for different hammers... Very nice rendition! Here is the original. The file is a diamond file. The holder keeps the file from touching the gage pins. The gage pins go into v-grooved slots. If you do not get the depth just right, to keep the file level, just use a different diameter pin. Here's also an adjustable link gage so if you want to get the hole spacing just right, for a center primer strike, you can make this up and adjust so that once you see a slight impression in the center of a primer, with a light tap of the hammer, this would be the hole spacing to use when you make up the final link out of steel. And here's also an action spreader that I made when I had to remove the lower tang assembly from a Highwall action. The sides of the action sprung in a bit and had to be spread a bit to get the tang back in. I did not want to force it back in. Worked gtreat.


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hepburnman Senior Forum Member Offline Posts: 402 Location: NJ Joined: Mar 22^nd, 2015	Re: Sear angle fixture design Reply #5 - Nov 10^th, 2021 at 9:00am	Print Post
	hepburnman wrote on Nov 10^th, 2021 at 8:59am: GT wrote on Nov 9^th, 2021 at 11:17pm: I have one I made for 1885 hammer sear engagement stoning. Doesn't work for the sear itself but it wouldn't take much to alter the design and make one fit the sear. It wasn't my design originally, I saw a picture of one somewhere and copied the idea, working on a couple more for different hammers... Very nice rendition! Here is the original. The file is a diamond file. The holder keeps the file from touching the gage pins. The gage pins go into v-grooved slots. If you do not get the depth just right, to keep the file level, just use a different diameter pin. Here's also an adjustable link gage so if you want to get the hole spacing just right, for a center primer strike, you can make this up and adjust so that once you see a slight impression in the center of a primer, with a light tap of the hammer, this would be the hole spacing to use when you make up the final link out of steel. And here's also an action spreader that I made when I had to remove the lower tang assembly from a Highwall action. The sides of the action sprung in a bit and had to be spread a bit to get the tang back in. I did not want to force it back in. Worked gtreat. Sorry, here are the pictures-


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hepburnman Senior Forum Member Offline Posts: 402 Location: NJ Joined: Mar 22^nd, 2015	Re: Sear angle fixture design Reply #6 - Nov 10^th, 2021 at 9:00am	Print Post
	Trying again-


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hepburnman Senior Forum Member Offline Posts: 402 Location: NJ Joined: Mar 22^nd, 2015	Re: Sear angle fixture design Reply #7 - Nov 10^th, 2021 at 9:01am	Print Post
	And again-


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Hayface Full Member Offline Posts: 249 Joined: Mar 20^th, 2015	Re: Sear angle fixture design Reply #8 - Nov 10^th, 2021 at 9:04am	Print Post
	Gents, Although I do not know the source of the article, I will offer some advice. I have built numerous sear and hammer stoning fixtures over the years and found that it is beneficial to set the fixture up so the stone will ride on a piece of feeler gauge. it eliminates wear on the surface of the fixture and allows accurate incremental adjustments to suit the geometry of the particular gun being worked on at the time. It also means the fixture need not be hardened. Sorry, no picture capabilities. Hayface
	« Last Edit: Nov 10^th, 2021 at 9:09am by Hayface »

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oldstarfire Participating Member Offline Posts: 40 Location: Center of Canada Joined: Jan 17^th, 2016	Re: Sear angle fixture design Reply #9 - Nov 10^th, 2021 at 12:46pm	Print Post
	Wow, great ideas! Thanks to all so far. Love to see any others!! Any thoughts on using pointed end screws (one each side) instead of pivot pins?


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idjeffp Senior Forum Member Offline Posts: 364 Location: Boise, ID Joined: Nov 11^th, 2017	Re: Sear angle fixture design Reply #10 - Nov 10^th, 2021 at 7:40pm	Print Post
	Loving this thread... especially that adjustable link idea! Jeff P


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AJ Full Member Offline Posts: 218 Joined: Aug 25^th, 2011	Re: Sear angle fixture design Reply #11 - Nov 10^th, 2021 at 10:40pm	Print Post
	I have often used a “trick” involving a vise and drill bit to rework a hammer sear. A drill bit is selected that is one half the diameter of the hammer pivot hole, and is used to center the hole to half depth in the vise. The hammer is rotated to just barely expose the sear, and then filing/stoning is done by keeping the file or stone level and parallel to the vise jaws. The photo is staged to give a better idea of what I am trying to describe so things aren’t set up perfectly.


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ssdave Frequent Elocutionist Offline Posts: 2138 Location: Eastern Oregon Joined: Apr 16^th, 2004	Re: Sear angle fixture design Reply #12 - Nov 10^th, 2021 at 11:32pm	Print Post
	AJ wrote on Nov 10^th, 2021 at 10:40pm: I have often used a “trick” involving a vise and drill bit to rework a hammer sear. A drill bit is selected that is one half the diameter of the hammer pivot hole, and is used to center the hole to half depth in the vise. The hammer is rotated to just barely expose the sear, and then filing/stoning is done by keeping the file or stone level and parallel to the vise jaws. The photo is staged to give a better idea of what I am trying to describe so things aren’t set up perfectly. AJ, that is an excellent way to "automatically" make the angle come out exactly neutral, which is required for a safe, but minimum resistance sear release. Using a half diameter pivot, puts the filed surface radial to the pivot hole, and automatically makes the sear perfectly neutral.


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AJ Full Member Offline Posts: 218 Joined: Aug 25^th, 2011	Re: Sear angle fixture design Reply #13 - Nov 11^th, 2021 at 1:16am	Print Post
	SSDAVE, you can vary the drill bit diameter to change the angle if you want something slightly different than neutral. It is also possible to do triggers in a similar fashion by placing them horizontally in the vise and lining up the cut on the side of the vise. I’ve been doing this for years and it works well. Also, after stoning I assemble everything and put a lot of forward pressure on the hammer spur and snap it a few times for a final accelerated honing.


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