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Several designs ranging
from simple to fancier are pictured below:

This
is a very slick example using an air grinder and QCTP adapter...



Router-based
TP Grinder: A Bit Heavier Duty!

Router-based
TP Grinder Again...

Sewing
Machine Motor TP Grinder...


Dead
Simple Fabricated TP Grinder from a Right Angle Grinder...

TP Grinder
from a Makita Trim Router...


A
TPG with a slightly larger die grinder. Note the cam action atop
for turning on the grinder...

Yet
another die grinder TPG...

DeWalt
Zip Tool is a Heavy Duty Dremel-Compatible Machine...
Nice
one from RCPlanebuilder
on HMEM


Spindle parts. Note the knurling on the shaft--original
cut too small. Knurling raised it to fit the bearing better!

Drive components.

Electric motor is an RC Plane starter. It proved
marginal according to the builder...



Nice Cartridge
Spindle Project from Mad
Modder



And the
TP Grinder that goes with that spindle is here.

3/16"
Redthane Belting...

Pulley
made with a 3/16" endmill and a 4th axis/indexer...
Cartridge
spindle and sewing machine motor...

Squaring
up to the backplate...

Pilot...

Line boring
the spindle holder plates. Nice way to do it on a lathe!



Upgraded
to a more powerful router motor!

Adapter
to mount Dremel wheels...

Now remade
to use a pin chuck--much more accurate than the Dremel chuck!
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