Atlas 10" runout

True Kwil, but can be handy at times. Ian S C

Hi ian,

I tried that with my wonderfully crude but effectrive nylon-faced hammer, but teh regisater on mini-lathes is a very close fit to the chucks..

Neil

Hello this is a good thread, and I have another question along the same lines.

I have a 18"churchill grinder. If I load a 12" mt2 test bar in to the grinder head It runs out about 0.008" right on the end. With no end support from the other centre. I reamed the MT2 socket and I now have it down to 0.002-0.004"

There is conveniently a oil hole in the casting which gives access to the spindle. I inserted a dti through the hole right on to the spindle whilst running between its own bearing and it is dead straight. (not bent at all)

The reason I want it to run better is... I often make taper tooling where I grind the taper between centres, then place the taper in the grinder head directly to grind internal diameters.

Example:- the internal taper for a collet holder.

So the question is should I expect better results, or am I asking too much?

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Just to add a bit more to the last thread.

I have a boxford with is in fair condition If I put a 0.01mm dti on the register (shoulder) it doesn't flicker.

I bought a test bar from RDG tools and it was ace dead straight and I use it to set up all my kit. Although, I think a lot of these online places change their suppliers frequently.

Lastly, the test method of putting a bar in a 3 jaw chuck seems flawed because general bar stock is not concentric. But, even a with a piece of ground bar my burnerd chucks rarely align better than 0.003" and the cheapo chineese one about 0.006"

Sorry for the change from mm to inchs. (depends which dti is to hand.)

Thanks Dave