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 In Techniques

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In previous entries, I explained how to lap short-bodied planes using diamond stones and sandpaper rolls (click to read parts 1 and 2.). 

This entry is dedicated to lapping larger planes and explaining how to avoid inadvertent convexing of the sole while lapping it. 

When dealing with longer and broader planes, we have to spend more time lapping (as more cast iron needs to be dispensed with), and in addition, we will have to replace the sandpaper media more often for that exact reason.

As an alternative to sandpaper adhesive rolls (in case you don’t have them at hand), we can use regular sandpaper sheets and affix them to our lapping surface using an adhesive. I like spray adhesive and prefer the low-tack one – which is easier to peel and remove from the substrate. An easy-to-remove liner to cover the lapping surfaces is also very beneficial, especially if the sandpaper adhesive is difficult to remove. Please check my recommendation for liners in my previous entry.

Grit disparity and the cambering of the sole

When I lap a plane’s sole, I use a knife-edge straight edge or a high-quality straight edge to check for the flatness and trueness of the sole.


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