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Thread: Cheap Through Hole Lap

  1. #1
    Supporting Member jjr2001's Avatar
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    jjr2001's Tools

    Cheap Through Hole Lap

    My little two cylinder steam engine model will need to have the cylinder lapped. I found these thru-hole-laps on eBay. Found some diamond grinding compound on the bay also. The lap 15/16 diameter was close enough to the 1" spec'd size for the piston and cylinder that I could not pass it up for about $6.00 with shipping included! However it was just the brass lap...Needed the support shaft and the tapered plug for expansion. Easy enough to turn and thread a 1/2-20 piece of steel for the shaft and then taper a piece of 1/2-20 all thread for the plug. Should work great and save me the time and brass for making the lap.

    Here is a great video by Suburban tool on through hole lapping:


    Don has a lot of excellent machining videos on the tube.

    Cheers, JR
    Attached Thumbnails Attached Thumbnails Cheap Through Hole Lap-img_1992a-copy.jpg   Cheap Through Hole Lap-img_1993a-copy.jpg  
    45 Best Harbor Freight Tool Modifications


  2. The Following 6 Users Say Thank You to jjr2001 For This Useful Post:

    Frank S (05-27-2018), NortonDommi (05-28-2018), PJs (05-28-2018), rossbotics (05-27-2018), Seedtick (05-27-2018), Toolmaker51 (05-28-2018)

  3. #2
    Supporting Member Frank S's Avatar
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    Frank S's Tools
    500+ Homemade Tool Plans

    I always enjoy watching Don's videos
    Good find on your brass laps
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    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  4. The Following 2 Users Say Thank You to Frank S For This Useful Post:

    jjr2001 (05-27-2018), PJs (05-28-2018)

  5. #3
    Supporting Member jjr2001's Avatar
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    Thanks Frank, I think Don is among the very best in making understandable videos for the shop.

    Cheers, JR

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    Thanks jjr2001! We've added your Through Hole Lap to our Machining category,
    as well as to your builder page: jjr2001's Homemade Tools. Your receipt:





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  7. The Following User Says Thank You to DIYer For This Useful Post:

    jjr2001 (05-29-2018)

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