Lathe Tool Post Grinders
have been several times when I've wished for a toolpost grinder to finish
a shaft just right and to close tolerances. I debate whether to buy a
used Dumore or Themac on eBay or try to fabricate one as a project. Simple
ones are really easy to make and just involve lashing a suitable Dremel
or hand grinder to the post in some way. More complex versions involve
fabricating a spindle and replicating the style of the commercial TP grinders.
I am really tempted to work on a spindle for one. It would be a good warmup
should I ever choose to make a more ambitious spindle, perhaps for a lathe
or a mill. Meanwhile, I am collecting photos of TP Grinders others have
made for ideas.
Several designs ranging
from simple to fancier are pictured below:
is a very slick example using an air grinder and QCTP adapter...
TP Grinder: A Bit Heavier Duty!
TP Grinder Again...
Machine Motor TP Grinder...
from a Makita Trim Router...
TPG with a slightly larger die grinder. Note the cam action atop
for turning on the grinder...
another die grinder TPG...
Zip Tool is a Heavy Duty Dremel-Compatible Machine...
one from RCPlanebuilder
Spindle parts. Note the knurling on the shaft--original
cut too small. Knurling raised it to fit the bearing better!
Electric motor is an RC Plane starter. It proved
marginal according to the builder...
Spindle Project from Mad
TP Grinder that goes with that spindle is here.
made with a 3/16" endmill and a 4th axis/indexer...
spindle and sewing machine motor...
up to the backplate...
the spindle holder plates. Nice way to do it on a lathe!
to a more powerful router motor!
to mount Dremel wheels...
to use a pin chuck--much more accurate than the Dremel chuck!
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