Please show me your Tool Post ID grinders.

Watch out for the spindle bearings in the spindle itself. I e read lots of stories of people buying tp grinders only to find out that the spindle bearings are shot. Spindle bearings from dumore are super darn expensive. Good luck
 
OEM parts are always a lot more expensive than buying quality name brand bearings from supply houses. There can be a catch sometimes when the OEM had special bearings made just for them. When I was doing spindle repairs I learned a little bit about bearings. Enough to be dangerous. Bearings designed for high speeds typically have greater clearances to account for the expected higher temperature expansion. Always replace both bearings of a set with factory matched sets. Pay attention to the orientation when you are replacing them so they are running opposed. If the preload is via spring washers replace in the same orientation they came off in. If the bearings are grease lubed don't totally fill them. It will cause them to run hot. Oil mist lube systems ensure a constant flow and carry away the excess heat, make sure they are clean and working. Be careful, a failed bearing can ruin a very expensive shaft. It is nearly imposable to tell if a bearing is bad once it is off the machine (unless it is really bad.) While you've got it apart replace all of them. Work in a clean area. Robin has a good video on bearings and tolerances.
 
Larry$ said:
OEM parts are always a lot more expensive than buying quality name brand bearings from supply houses. There can be a catch sometimes when the OEM had special bearings made just for them. When I was doing spindle repairs I learned a little bit about bearings. Enough to be dangerous. Bearings designed for high speeds typically have greater clearances to account for the expected higher temperature expansion. Always replace both bearings of a set with factory matched sets. Pay attention to the orientation when you are replacing them so they are running opposed. If the preload is via spring washers replace in the same orientation they came off in. If the bearings are grease lubed don't totally fill them. It will cause them to run hot. Oil mist lube systems ensure a constant flow and carry away the excess heat, make sure they are clean and working. Be careful, a failed bearing can ruin a very expensive shaft. It is nearly imposable to tell if a bearing is bad once it is off the machine (unless it is really bad.) While you've got it apart replace all of them. Work in a clean area. Robin has a good video on bearings and tolerances.
Click to expand...
Great information, Larry$

There is also 1-1/2 hours of extremely detailed information on rebuilding precision spindles in this Robin Renzetti video.
 
I think a new Grizzly may be a better choice than a 60 year old clapped out Dumore.
Still too much though. I'm hoping to be in the $350 or less range. No hurry, I'll keep looking.

www.grizzly.com

3/4 HP Tool Post Grinder

<h1>T27400 3/4 HP Tool Post Grinder</h1> <h2>An efficient, convenient tooling option for precision grinding on workpieces mounted to a lathe.</h2> <p>Grinding allows you to produce a superior surface finish on work-hardened materials and hold extremely tight tolerances on long shafts.</p> <p>The...
www.grizzly.com www.grizzly.com

Or, a Hemingway kit? Anyone have experience with it?

Dynamic Tool Post Grinder - hemingwaykits.com

Unique projects for the small workshop owner. Please browse our Toolroom and Engine Bay for our latest project kits.
www.hemingwaykits.com
 
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Dumore spindle bearing are not off the shelf and can only be had through the company as far as I know. 300 a piece last I checked.
 
If you want to make one I'd suggest this guys plans. Not a difficult project.
 
Hey Jeff, did you ever get a tool post grinder? This noticed this one local:

slo.craigslist.org

Themac Precision Grinder J45 2025 - tools - by owner - sale

I have a THEMAC precision grinder J45 2025 for sale for only $250.00. Great condition. Doesnt come with the wheel guard but i built a platform so it can be attached to a table. This tools are US...
slo.craigslist.org
 
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