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Software and Information for Machinists |
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Toolpost Grinder |
There 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.
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Toolpost Grinder
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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...
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