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:
https://www.youtube.com/watch?v=eYteQGM_zTE
https://www.youtube.com/watch?v=H2SeLcbcYkE&t=776s
Don has a lot of excellent machining videos on the tube.

Cheers, JR

I always enjoy watching Don's videos
Good find on your brass laps

Thanks Frank, I think Don is among the very best in making understandable videos for the shop.

Cheers, JR

<!-- BEGIN /var/www/html/homemadetools/protected/modules/zeus/views/tool/postUpdate.php -->
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:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="http://www.homemadetools.net/homemade-through-hole-lap"> <img src="/uploads/214202/homemade-through-hole-lap.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="http://www.homemadetools.net/homemade-through-hole-lap">Through Hole Lap</a> <span> by <a href="http://www.homemadetools.net/builder/jjr2001">jjr2001</a></span> </div> <div class="tags">tags: <a href='http://www.homemadetools.net/tag/honing'>honing</a> </div> </div> </div> </div>
<!-- END /var/www/html/homemadetools/protected/modules/zeus/views/tool/postUpdate.php -->