I have been reading a FWW Magazine of which had heaps of articles of interest, one of those was an artice on Hollow Chisel Mortisers (HCM)
I had been making some M&T joints and a minature stair rail with my HCM.
The stair rail
The scale and Chisel size may not be the best and the M&T were garbage (NWP)
With the very unsatisfactory results I decided to do more research and checked out some LJ Blogs/reviews.
It seems HCM do not get rave reviews for all sorts of operational reasons.
However a common viewpoint almost every where was that the chisels need to be lapped and resharpened before use.
I had done this with mine when I first bought it but decided to revisit the procedure again.
I had two chisels of the same size so I used one as a comparasion as I reworked the other one.
I used a four sided diamond hone labeled 200,300,400 and 600,and grey polishing compound on the Auger flutes.
This is what the surface improvement looked like.
I started on the chip opening side first and progressed around the chisel, its fairly obvious the rework is on the left, and you can still see my previous lap work on the right chisel.
Next side 2 Again its visible the additional work was required
Then side 3 Much the same result here.
and finally side 4 possibly not quite as much variation here.
the Auger exposed is definately shiner and smoother.
The process took me about 1 hour using the diamond stone in a water bath.
Conclusion: Is it all worth the effort? Well the surface is certainly smoother so binding should be reduced.
I will do a comparasion test soon using both chisels (and buy some dry Lube as well) and report back soon.
-- Regards Robert