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M 77 project (Read 11503 times)

bluesman Full Member Offline Posts: 193 Location: Paradise, California Joined: May 29^th, 2006	Re: M 77 project Reply #30 - Mar 15^th, 2021 at 4:32pm	Print Post
	This is going to be very cool....A hot rod Sharps!


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bobw Frequent Elocutionist Offline Posts: 2109 Location: NW, Iowa Joined: Mar 19^th, 2013	Re: M 77 project Reply #31 - Mar 15^th, 2021 at 6:52pm	Print Post
	Holy cow! I hadn’t noticed the piece of wood, to intrigued by the machining I guess. That has about 3 times the curl I thought it had in the other picture I saw. That deserves some special TLC!


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ssrifles Senior Forum Member Offline Posts: 321 Joined: Mar 23^rd, 2009	Re: M 77 project Reply #32 - Mar 15^th, 2021 at 10:16pm	Print Post
	bob, we have to set up a sting operation to save this piece of wood.i'll destract him, you get a piece of cull 2x6 from the lumber yard and replace it.he'll never know.this piece of wood cannot die in vain.oh keep this from greg. tony <><


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bobw Frequent Elocutionist Offline Posts: 2109 Location: NW, Iowa Joined: Mar 19^th, 2013	Re: M 77 project Reply #33 - Mar 15^th, 2021 at 10:56pm	Print Post
	I’m in....let me know when you want to make the switch.


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GT Frequent Elocutionist Offline Posts: 2368 Location: Northeast Wyoming Joined: Jun 28^th, 2015	Re: M 77 project Reply #34 - Mar 15^th, 2021 at 11:21pm	Print Post
	guys, I can get it to where it looks like a stock, feels like a stock, shoots like a stock should, I just tire of it before it's finished... I need someone that just likes to finish these out I even have some trading done already that if I get it to that point it'll get checkered...

	"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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GT Frequent Elocutionist Offline Posts: 2368 Location: Northeast Wyoming Joined: Jun 28^th, 2015	Re: M 77 project Reply #35 - Mar 15^th, 2021 at 11:50pm	Print Post
	Found a little more time the last couple evenings, machined the dovetail in the breech block for the Freund style of firing pin and transfer bar retainer. Machined the link and then got the retainer roughed out, the dovetails fit each other... little snug but should work.

	"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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GT Frequent Elocutionist Offline Posts: 2368 Location: Northeast Wyoming Joined: Jun 28^th, 2015	Re: M 77 project Reply #36 - Mar 15^th, 2021 at 11:54pm	Print Post
	There's a lot of extra material to remove from the retainer, a hole to drill and counterbore, then more fitting... Just about have the breech block making it all the way home - just a little more filing and fitting...

	"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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nuclearcricket Oldtimer Offline Posts: 824 Joined: Oct 15^th, 2008	Re: M 77 project Reply #37 - Mar 17^th, 2021 at 6:22pm	Print Post
	Very nice work. I did see something I wanted to ask about. It looks like when you were showing the lapping, it looked like you had used a piece of aluminum foil on a granite place for some final finishing. Is that correct? I had never though of doing that, I take it that on that step you used the very fine compound. You probably don't need it but if you want to bring up a shine after your final lap, pick up some yellow diamond compound. Can get it from MSC. Put a bit of that on a piece of manila folder on top of the surface plate and that will turn a very flat smooth surface to a mirror in short time. Sam


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GT Frequent Elocutionist Offline Posts: 2368 Location: Northeast Wyoming Joined: Jun 28^th, 2015	Re: M 77 project Reply #38 - Mar 17^th, 2021 at 9:35pm	Print Post
	Sam, Thanks, my paths on this build have wandered quite a bit but that's what keeps it interesting. An old mold maker showed me that trick with the aluminum foil on the granite, but he also recommended not using it on the same granite used for higher accuracy measurements... I had used paper before and what he told me was the paper would wear uneven with varying pressure whereas the foil would remain constant - although it does tear easier. This old timer had optical flats (and some special lighting) for measuring and produced surfaces with his methods that most of us don't even know exist. Tom Lipton's youtube video's are worth watching as he goes into these details. I'm not trying to keep things as flat as he was although it's fun to see fringes develop under the optical flat when one dabbles in this. The higher finishes I get are probably a waste of time but the machinist in me is fascinated with shiny objects... Yellow from MSC is about a 1.5 micron compound? I think in most of my lapping I use red and that's about 4 micron? That's what the tubes of compound from years ago say, their webpage is a little more non-descript now... As I did mention I bought a box of various diamond compounds off eBay for less than one pays for a single tube of the great stuff and it includes .25 micron up to 5 micron paste, so if one spent the time some amazing finishes could be had. Greg

	"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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nuclearcricket Oldtimer Offline Posts: 824 Joined: Oct 15^th, 2008	Re: M 77 project Reply #39 - Mar 17^th, 2021 at 11:05pm	Print Post
	Not sure of the micron size of the yellow, mine just says "Yellow, #3. I do know that White is the finest, yellow next and changes color each step up. I think I have orange and green. I have used it on a lapping plate to lap carbide parts and then the paper for the final polish. I would think that heavy duty aluminum foil would be better to use than the standard stuff. I understand not using it on a high grade granite plate for inspection and such. Grizzly had and probably still does offer a small plate that would be good for that kind of use and they were not very expensive. As an alturnative you could also use the very fine grits of wet dry paper. I keep some on hand that goes up to 2000 grit. I am sure its quite interesting to see things develop under optical flats. I have never used them but have used a .00005 indicator enough to know how much things can vary. SAm


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GT Frequent Elocutionist Offline Posts: 2368 Location: Northeast Wyoming Joined: Jun 28^th, 2015	Re: M 77 project Reply #40 - Mar 25^th, 2021 at 10:28pm	Print Post
	Had a little time this week to spend on the project. I'm winning the battle with the wedge and the block. It fits and moves up and down, when I get back to it I'll share some more pictures. The last couple of evenings I've spent with lock parts. That alone will cause grey hair and bald spots. As boring and tedious as the fitting can be it also offers some challenges. I finally had a sear turn out and I can cut the engagement areas on the tumbler and get a position for the triggers on the lower tang. Then I showed some of the steps making the stirrup...

	"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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GT Frequent Elocutionist Offline Posts: 2368 Location: Northeast Wyoming Joined: Jun 28^th, 2015	Re: M 77 project Reply #41 - Mar 25^th, 2021 at 10:46pm	Print Post
	The stirrup isn't really all that tough to make but being a dainty little thing does make it interesting to hold and finish... Slotted the tumbler for it and drilled the pin hole, still need to drill and make the pin for the stirrup. I'm trying a little different approach (for me) in making the spring(s) I'm pinning this one to the lock plate right at the bend. I'm also pinning and soldering a block on the lock plate that will serve as a lever point for the v-spring and the small spring for the sear. (usually the tail of the v-spring applies tension for the sear, I'm going to copy the Axtell sear spring design I saw Larry Potterfield working on) If time permits in the next few days I'll shape, heat treat and temper the v-spring

	"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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Chuckster Frequent Elocutionist Offline Posts: 2313 Location: Colorado Joined: May 15^th, 2008	Re: M 77 project Reply #42 - Mar 26^th, 2021 at 10:37am	Print Post
	Looking good, Greg, Lock making is almost a separate set of skills, both decorative and functional. Chuck


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Amoretti Full Member Offline Posts: 222 Location: thermopolis, Wy Joined: Nov 2^nd, 2009	Re: M 77 project Reply #43 - Mar 26^th, 2021 at 10:39am	Print Post
	Greg, Neat stuff as usual. Question-how do you finish the damascus to retain the colors and make it somewhat rust resistant? What happens to damascus when you color case it? Happy to see you're using maple stocks, I really like the look though not traditional on single shot cartridge rifles, far from unknown. John


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bobw Frequent Elocutionist Offline Posts: 2109 Location: NW, Iowa Joined: Mar 19^th, 2013	Re: M 77 project Reply #44 - Mar 26^th, 2021 at 10:28pm	Print Post
	That’s a nice looking lock Greg!


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