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Thread: Hand Lapping



  1. #1
    Sidewinder
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    Hand Lapping

    What is the going rate to "HAND LAPP" a Marlin rifle

  2. #2
    Really Short Fuse Administrator
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    Re: Hand Lapping

    Why? You can very easily either hand lap or firelap. We can tell you how if you wish. And doing a search will get you several great threads on firelapping.

    Dave
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  3. #3
    Sidewinder
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    Re: Hand Lapping

    Tell me how............I wish?

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    Drivin my life away... Super Moderator
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    Re: Hand Lapping

    Well...this is a crude method but it does some good (quite a bit actually...especially on new barrels)

    Get you some Remington 40x bore cleaner and follow the instructions on the bottle... go through the whole procedure about 10 times.

    Remington 40x is a mild abrasive suspended in liquid and it will remove most of the nicks and burrs left from the rifling process.

    I've heard some say JB bore paste also works...but I haven't used it. I have used the Remington 40x to smooth up a new barrel many times, the stuff is too harsh for regular cleaning in my opinion.

    My new 1895 was leading something terrible when I first got it...40x smoothed it right up.

    Oh...almost forgot...shoot at least 2 boxes of jacketed bullets through it first, that also will take out some of the nicks and burrs.

  5. #5
    Sidewinder
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    Re: Hand Lapping

    That sounds like polishing not "hand lapping". How to hand lapp please?

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    Re: Hand Lapping

    Quote Originally Posted by jhaffner202
    That sounds like polishing not "hand lapping". How to hand lapp please?
    From Lilja barrels – This is hand lapping and how it’s done.

    http://www.riflebarrels.com/faq_lilj...rrels.htm#hand

    click on the link or scroll down.
    Danny

  7. #7
    Tinhorn
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    Re: Hand Lapping

    FWIW, I have never hand lapped a barrel, but I have lapped some gauges and so on, and it is really easy to develop a small bell mouth at the ends of the bore. The Lilja writeup doesn't mention it, but at least some other barrel makers have a last step of 'cut a few inches off the barrel to remove the bell mouth'. Lilja may do that too, or may have a way to prevent it.

    Anyway, food for thought. If anyone has hand lapped a barrel, I'd love to hear the results. If I ever come across a discard barrel I'll have to try it and see - but I ended up firelapping my own barrels. That works, if done carefully (I used the procedure in Beartooth's book).

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    Re: Hand Lapping

    Quote Originally Posted by whomever

    it is really easy to develop a small bell mouth at the ends of the bore. The Lilja writeup doesn't mention it, but at least some other barrel makers have a last step of 'cut a few inches off the barrel to remove the bell mouth'. Lilja may do that too, or may have a way to prevent it.
    whomever - go back to the link and look at the next question…”Why do Lilja bbls have a band saw cut on the muzzle end”…
    This whole page is filled with good stuff, as is the rest of Dan’s site…

    I have never hand lapped a barrel – and the reason is simple; I do not have the instruments necessary to accurately measure the inside of a deep hole…

    I have firelapped many rifles – with good results though…
    Danny

  9. #9
    Drivin my life away... Super Moderator
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    Re: Hand Lapping

    Quote Originally Posted by jhaffner202
    That sounds like polishing not "hand lapping". How to hand lapp please?
    Lapping is polishing...

    Definitions...
    Lapping: a : to dress, smooth, or polish (as a metal surface) to a high degree of refinement or accuracy

    Polishing: To make smooth and shiny by rubbing or chemical action.

  10. #10
    Tinhorn
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    Re: Hand Lapping

    whomever - go back to the link and look at the next question…”Why do Lilja bbls have a band saw cut on the muzzle end”…

    Ooops, stopped reading too soon :-), thx!

    Lapping is polishing...

    In machinist parlance, they are different. Lapping is an abrasive embedded in a soft (lead, brass, cast iron) lap used for precision dimensioning. Polishing is using abrasive paper or a rag and polish to change the appearance, but it's not about dimensioning; polishing makes things prettier but not straighter/flatter/more accurately sized.

    So I think machinists use a different definition than the general one.


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