lapping compound
- Thread starter Zdragunov
- Start date
FreedomIsn'tFree
CGN Ultra frequent flyer
- Location
- Republic of Buffalo.
As stated above valve lapping compound is what you want and can be purchased at any automotive store.
Important, that!
Oh yeah. Diamond grit. Ebay. Cheap! Worth looking there for silicon carbide grit too.
Also, Richontools. Google search that term.
Otherwise, roll your own with grit used for rock tumbling, and grease.
Cheers
Trev
- Location
- Ottawa origanally Muskoka
Wow. Aparently no one cares about silicon Carbide embeding its self.
You should really read the machinists handbook some time. You guys are making suggestions on what to use and you have not even found out WHAT is being lapped or how it is being lapped. "Coyote" is the only one that has it right
You should really read the machinists handbook some time. You guys are making suggestions on what to use and you have not even found out WHAT is being lapped or how it is being lapped. "Coyote" is the only one that has it right
I have a kit with 4 grades/grits of paste you apply to your own bullets I won't likely be using any time soon if your interested in purchasing cheaply ? It's for fire lapping but I see no reason it couldn't be used manually if that's what you're thinking.............Harold
- Location
- Ottawa origanally Muskoka
No reason at all it won't. A tight fitting jag or better still a lead bullet swaged through the barrel then mounted on a stout one piece cleaning rod as the lap, lots of elbow grease, cleaning supplies and a few extra soft cast bullets for successive lapping compounds should do the job. But clean the ba jezus out of the barrel between compounds and more so after she's all done.
Don't work the lap back and forth. Chamber to muzzle then remove lap and insert from chamber for next pass.
If its the lugs on your bolt you are after then you will need more than just the proper lapping compound. You will also want machinists dye, head spacing gauges and action, barrel wrenches to put things back in spec....and again a but load of cleaning supplies. Any grit left on the surface embedded or otherwise will continue to lap your lugs as you use your gun otherwise.
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- Location
- Ottawa origanally Muskoka
You can buy a barrel lapping kit from many gun stores that contain various pastes that are applied to standard bullets for fire lapping. I believe Otis makes a kit for this.
Cast bullets can be obtained and their grease grooves and driving bands filled with the same compound and then pushed through manually. Various grades of diamond compounds are available from kijiji and e-bay, lee valley or factory direct as well. I have no experience with the diamond pastes however. I've heard many people rave about them but my knowledge says it may very well embed much the same way as silicon carbide. Diamond being a very hard and sharp grit. The one way to minimize this is to spend much increased time with the next sucessive finer compounds to work the previous and larger grits free and ensure all larger scratches from the previous coarser grit are erased.(Example: 20 strokes with coarce, 40 strokes medium, 80 strokes fine, 120 stokes extra fine..example only) The fine compounds being so minute in grit size that they will clean free of the highly polished void free surface more easily as they physically can not embed them selves very deeply. Another approach and my preferred method would be to finish up with a very fine soft grit like occur or rouge as it is sometimes called. This has all the same characteristic advantages in the method previously described but has the final advantage of loosing its sharpness much faster than diamond so any minute traces that are embedded or left behind will dull quickly and cease cutting. Embedding the lap with the compound on either a hardened steel plate, polished granite slab or tempered glass combined with a lap that is softer than the work piece (lead being softer than barrel steel) also ensures that the grit embeds its self in the disposable lap and not the work piece.
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- Location
- Ottawa origanally Muskoka
I posted in response to a hijack. A bit of a faux pas but...
Your thoughts mirror my initial thoughts as well. Could be anything from a barrel to scope rings, might not even be a gun part. Stainless, CrMo steel, aluminum, cast iron who knows.....looks like the OP went with the first answer he got and jumped ship.
- Location
- Ottawa origanally Muskoka
Similarly I have an acorn threading die that had a sticky collet cap. A dab of blue magic polish on it and work the threads a bit freed everything up.
