scope rings lapping

Discussion in 'Gunsmithing' started by mister c, Aug 1, 2012.

  1. mister c

    mister c Active Member

    Messages:
    25
    Joined:
    Aug 1, 2012
    I ordered a scope lapping kit and it came with a 1 oz. jar of 220 lapping compound, the top porio of comoun had 3/16th of what looked likewax compound on top of the grey. I called wheeler and they said to mix it, so i did it now looks grey grease. nothing like scope mounting videos showing the process. any info would be appreciated.........mister c
     
  2. atkins0331

    atkins0331 Active Member

    Messages:
    35
    Joined:
    Mar 18, 2010
    Mister C,

    Lapping rings is pretty easy. Mixing the compound is up to you. I just dip my finger in and always end up with plenty on my finger. First step is to make sure your base and rings are secured to the proper torque specs. I always use loctite as well. If you are using dovetail type rings make sure they are as straight as possible. You can do this by using the lapping bar prior to applying compound. Hopefully you are using weaver or picatinny style rings as they are much better.
    Place the firearm in a secure setting like a vise or clamp style cleaning station. It needs to be totally secure. Rub a bit of compound on the lapping bar and set it in the rings. Be careful not to get any compound in the screw holes. Add the top half of the rings and finger tighten the screws as evenly as you can. A good way to do this is to use the bit only if possible. If it is too tight you will immediately know as the bar will not move.
    Gently move the bar perpendicular to the weapon to start the bar. Once the bar moves freely, move the bar parallel to the rifle. When the bar has little pressure remaining, this step is done. Remove the ring tops and bar. Use a towel and clean off the inside of the rings, once again being careful not to get any compound in the screw holes. Now you can see what you are working with. The lapped part will be obvious. The rings might lap very evenly or not even at all. The price you paid for the base and rings makes little difference I have found.
    After this first lapping, or (test), you can get down to business. Place the coated bar back in the rings. Continue to lap until you get little pressure. Take the bar and ring tops off and clean them with your favorite cleaner. Place your scope in the rings, install the top halves checking the clearance between the two halves. If you lap too much, no space will remain between the rings and they will be ruined. Continue the procedure as needed. Lapping is a slow process of give and take. You can lap as much as you want as long as you leave at least 1/16 of an inch between the rings.
    Things to remember:1. Aluminum will lap much quicker than steel. 2. Lapping compound and screws/holes don't mix. 3. Once you think you have all the compound off the rings, clean them again. 4. Once you remove material you can not replace it. 5. TAKE YOUR TIME. 6. If you don't, you will end up throwing your first lapping project in the trash. 7. You can usually take a cheap set of rings and lap them into a great set. 8. If your bar binds, moving it perpendicular for the entire process is acceptable. Just make sure to move it around a bit or you will ruin your bar. Have fun
     

  3. mister c

    mister c Active Member

    Messages:
    25
    Joined:
    Aug 1, 2012
    thanksfor the quick reply, I'm concerned about the 220 lapping compound the top of the jar had about 3/16 thick substance that looked like hard yellow wax. the company customer service said to mix it in wwhich i did, and the lapping compound now has the consistancy of grease not at all like the demo's show. I dont know if i should use it.........................................thankyou................. mister c.
     
  4. atkins0331

    atkins0331 Active Member

    Messages:
    35
    Joined:
    Mar 18, 2010
    The thickness has changed but it is still 220 grit. It will be fine.
     
  5. mister c

    mister c Active Member

    Messages:
    25
    Joined:
    Aug 1, 2012
    thanks again atkins 0331,now i can get to it..................mister c
     
  6. bruce_ventura

    bruce_ventura Well-Known Member

    Messages:
    1,106
    Joined:
    May 22, 2011
    Yes, use it anyway.

    Aligning the rings well before lapping will usually minimize the amount of material you need to remove. That may mean shimming/bedding the base(s).
     
  7. SidecarFlip

    SidecarFlip Well-Known Member

    Messages:
    4,113
    Joined:
    Dec 12, 2011
    Lapping compound is grit, most times screened to size carborundum particles and sometimes sized diamond grit (in specialized lapping compounds). The stuff you'll use is carborundum in a pertoleum based carrier. It seperates as it sits. No biggie, You can mix it back up or use it as is. It's sort of like oil based paint but thicker and with grit suspended in it.

    My personal preference is Clover Lapping Compound (permatex). It comes in various grits from coarse (around 200 grit) to very fine (400 grit and over) and is available from most machine tool supply houses.
     
  8. mister c

    mister c Active Member

    Messages:
    25
    Joined:
    Aug 1, 2012
    sidecar flip, thankyou. verywell appreciated..........mister c.