Tool Tip #18: Hollow Chisel Mortiser HCM Tune up More Preparation work

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Blog entry by robscastle posted 07-01-2015 05:25 AM 1923 reads 1 time favorited 0 comments Add to Favorites Watch
« Part 17: Hollow Chisel Mortiser HCM Chisel Tune Up Part 18 of Tool Tip series Part 19: Hollow Chisel Motriser HCM Test run and Results »

After completing lapping and polishing all the Hollow Chisel (HC) external surfaces it was time to go inside.
It was a pretty ugly view I tell you.

A very rough surface finish indeed, so out with the paper and dowel stick, (now this is OK for 5/8 1/2 and 3/8 but below that its very tricky so I used a dremmel. (Psst its really and Ozito Knock off)

My first results with paper were encouraging but very slow going so I fitted up the dremell with some stones and tried that. A much better result however the metal was eating the pink composition wheels as fast as.
I wasnt too concerned as they wore away I worked out how the smaller chisels would be done!

The brown composition wheel showed very little wear so it was not going to reduce as fast. So it was only suitable for a couple of HCs.

Here is a couple of shots of the pink composition

After all that a good wash and inspection showed great results, well at least they looked good.


Some observations I made along the way nbeener has posted an almost similar process, Neil I think found the same info as I.

The augers have a tendency to suffer from run out especially the smaller ones 1/4 and so on.
This is no big deal as long as you use the HC to align your work instead of the auger point.
They can be corrected by some careful bashing, but I doubt I could get zero runout.
Trying to find a 5/8 suitable diamond cone hone is almost impossible so I was unable to hone the 5/8 at this stage.

Ready for testing.

-- Regards Rob

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