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Member postings for David Robinson 2

Here is a list of all the postings David Robinson 2 has made in our forums. Click on a thread name to jump to the thread.

Thread: Backlash - Steppers, Toothed Belts & Ballscrews
14/03/2013 20:42:46

I converted my old Henry Milnes vertical mill last year. For those unfamiliar with it it is a very hefty lump. I used ballscrews and a two to one drive x and y from steppers and a bigger stepper with a three to one

to drive the existing acme thread of the knee and carriage on the basis that if I could get backlash lifting going on for a quarter of a ton of knee and carriage then I must be taking too big a cut!

The speed reduction obviously affects the feed and movement speeds but I find it more than adequate for me to keep up with. The ballscrews seem to have totally got rid of bachlash.

Dave Robinson.

Thread: Diamomd tool holder
11/10/2009 00:23:51
Hi,
 
In a post war book on lathes there is an illustration and description of Alfred Herbert  Polytip tools. These use the same principal with carbide formed in square, round and triangular toolbits. In these tools, the holder was split from the toolbit , rearwards for about an inch and a screw to close the split, clamping the tool. they also had a support/height adjuster in the form of a grub screw in an extension under the bottom end of the toolbit.
 
Sometime in the seventies or eighties there was also an article on this same type tool from which I made one or two in the M.E. A further reason for their use mentioned was that they utilised the 'end grain' of the H.S. toolbits which apparently reduced wear. I have one set up on my lathe at the moment that I made all those years ago and still use.
 
Dave. 
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