Has anyone a cunning plan for sharpening the hollow chisel part of a machine
mortice chisel? The inner shape is basically conical, merging with the
square outer shape of the tool and I am aware that some manufacturers sell a
conical grinding cone, but the only ones Google is providing are
unbelievably pricey - in fact more than I can buy a complete chisel and
drill bit for!
2012 14:39:40 +0100 typed in uk.rec.models.engineering the following:
Maybe so. But how many times do you have to not "buy a new chisel
and drill bit" before you are ahead? Part of the reason they are so
expensive is that you don't need one all that often, and you need a
new one even less often. Specialty tools tend to be pricey just
because they are specialty tools.
By the sharpeners, then you don't have to buy new chisels. Buy
the good sharpening tools, then you don't have to break down and buy
the one you should have, and you get a better result on the tools you
Obi-wan once observed"The Force can have a strong influence on the weak-minded."
Bob Minchin's post giving me details of the Lee Valley offering has put
things into a more acceptable price bracket - thanks Bob. I've tentatively
ordered a set of the diamond hones, just awaiting confirmation of shipping
costs. In the last few months I have acquired two morticers (a Sedgwick
normal chisel one, and a Dankerts chain and chisel one. Both came with a
motley selection of chisels up to 1", most needed sharpening, so there is no
shortage of sharpening fodder! Tilgear also offer a piloted countersink
version which I have ordered, but it only does up to 1/2"/. I do wonder if
it is feasible to mount a chisel in my cylindrical grinder headstock, rotate
it 45 degrees off centre, and use a small internal stone at high speed to
give an edge - probably only any good for the larger sizes.
You could adapt a conventional internal grinding wheel to a *cone* using
a diamond dresser mounted on the lathe toolpost with the cross slide set
to some suitable angle. Grinding dust won't help the lathe bed:-(
You could consider making your own diamond cone grinding point. I've
turned the blanks for items and had the diamond coated by Asahi Diamond
in the UK. Various companies offer the service and it varies with size
and grit so may be worth enquiring.
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