Reply by Kelly

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Posted on grider question

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2633 posts in 3551 days

#1 posted 02-15-2017 10:23 PM

For sharpening in a woodworking shop, slow is never bad. It’s one of the reasons the Tormex machines sell. The only reason people go for 1750 as slow is, that’s what is available, until you build your own. You cannot change speeds on the average grinder. What you see is what you get.

Just for reference, I, generally, never take my grinder up over four hundred RPM. Once I have a knife where I need it, that speed lets me sharpen in seconds, without taking off valued HHS.

Again, if you are going to look at a pillow block approach, look into DC commercial sewing machine motors. Mine is a one horse, came with the control box, will adjust from zero to twenty-five hundred RPM, and reverses at the flip of a switch.

Reversing on a lathe is gold, because, for example, it lets you sand from the top. For a grinding station, it lets you run things that would, normally, be torn up by the blade.

Just for reference, a BRAND NEW DC sewing machine motor runs around two hundred. That’s probably about fifty to a hundred more than a good AC motor, but look what you get for the extra.

what is a slow speed for an 8”, is slow bad, it would come in handy for honing my carving tools. I have heared a lot about CBN wheels what are they. I have also heard MDF is good. thanks Mike

- Karda

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