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Mini surface grinder

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bogstandard:
John,

If set up right, it will allow you to grind surfaces very flat, ie, no detectable surface deviations.

Also, because it grinds rather than cuts, you can harden a piece, then still be able to get perfect dimensions on it by grinding it down to size, taking out any deformations caused by the hardening process. A 0.001" (0.02mm) cut is a heavy cut.

It works on the same sort of principle as your little shaper, but it grinds rather than cuts. Take a grind, move across a bit, do another one.

I use mine mainly to get perfectly ground lathe tools, sliding faces and refacing my parallels. But now, I even use it for sharpening milling cutters. The list is endless.

It is the table that is the critical bit. It needs to sit, if possible, on precision bearing surfaces. You use the grinding head to grind the top surface of the working area (normally smaller than the table size) before commisioning and use of the machine. The table then runs true to the grinding spindle.

John

Bernd:
I've got a small manual grinder. A freind of mine did a bit of dumpster diving to save this one. He took it home cleaned it up and then gave it to me. I think there's something wrong with the grinding spindle. When it shuting the grinding motor off the grinding spindle make s a weird noise, like the bearings are running dry. I've never been able to find any info on it either. I've asked in several other fora and no answers.

Here's a pic of it:



It grinds ok but leaves a bit of a wavy finish. It does good enough for lathe tool grinding. The jig sitting on the table is for sharpening a threading tool.

Bernd

Darren:

--- Quote from: bogstandard on July 31, 2009, 05:24:27 PM ---

It works on the same sort of principle as your little shaper, but it grinds rather than cuts. Take a grind, move across a bit, do another one.



--- End quote ---

Talking of shapers, I was sitting looking at mine tonight thinking, what if....

What if you mounted a grinding spindle in place of the clapper box?
As you say, the shaper takes a cut, moves across a bit and takes another cut. You have an indexing device in the form of a slide.
I think that about covers it dunit....?

Bernd:
Darren,

If I remember correctly I saw or heard that one before. It should work.

Bernd

bogstandard:
Unfortunately Darren, the surface grinder works on a little more precision than your shaper has got. It would work, but I don't think you would get the accuracy that is desired. Your shaper most probably works to the nearest thou or two, a normal surface grinder can work to 1/10th of that, or even better.

To knock a tiny pin in, you use a tiny hammer to achieve a good job. Use a sledge hammer to knock the same pin in, the results would be rather unpredicatable. Same same as above.

John

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