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Tool Talk Discussion Forum

tool post grinder

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landlord7012

03-10-2006 12:46:16




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Need some advice (wheel and chuck direction and speeds, wheel material, etc)for operating a DuMore tool post grinder I was given. I'll be grinding D-2 tool steel hardened to 50-52 RC. Diameters range from .875 to .437. Thanks in advance. I'll try to post my results. Any advice welcome and appreciated!

ll




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Dave_Id

03-11-2006 13:33:26




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 Re: tool post grinder in reply to landlord7012, 03-10-2006 12:46:16  
D-2 is pretty tough stuff to grind. 50-52 range seems pretty soft for D-2. Normally get around 58RC I'd start with a 46J wheel to see how that works, if you get too much burning, maybe a 46I, but I think 46H will break down way too fast for D2. If you have good wipers on the carriage, that should take care of most of the grit, but you'll still want to cover the ways with rags. Also, leave minimal stock. Maybe a total of .005 on the diameter.

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ohio

03-11-2006 01:09:15




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 Re: tool post grinder in reply to landlord7012, 03-10-2006 12:46:16  
cover ways with rags and NEVER clean lath with compressed air! as long as its covered, it will be ok. keep d2 cool, it cracks easily, and make sure you get the correct stones. there should be something out there just for d2. it's tough shirt.



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Davis In SC

03-10-2006 19:51:35




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 Re: tool post grinder in reply to landlord7012, 03-10-2006 12:46:16  
Be careful with that grinder, I knew of a guy that was killed by one... the wheel exploded.. There should be a chart that gives the speed for the pulley changes. If not, check the Dumore web site or contact them, for the speed chart...



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Bud in NC

03-10-2006 17:05:02




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 Re: tool post grinder in reply to landlord7012, 03-10-2006 12:46:16  
Be sure you cover the bedways! One of the quickest ways to trash any lathe is let the grinding grit get onto the ways and letting the carrage travel wear the ways down.



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MikeCatthemuseum

03-10-2006 16:51:43




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 Re: tool post grinder in reply to landlord7012, 03-10-2006 12:46:16  
Haven't run a toolpost grinder much, but I can offer two bits of advice. Turn the wheel opposite lathe rotation, otherwise your wheel is esentially running slower. Run the lathe at very slow speeds and use extremely light cuts (.001 or so).

Biggest pice of advice is simply do not use a lathe you cherish for grinding work. Grinding will eat a lathe up. If you just grind very occasionally, you can help things out by covering the ways and eveything else with rags, but grit will get everywhere. The end result is a ruined bed if a lot of grinding is going on.

You might either want to find a trashed old lathe for grinding (which unfortunately will not be very accurate) or get a tool and cutter grinder or cylindrical grinder for this kind of work. Don't kill your favorite lathe with a toolpost grinder.

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