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Re: 7x16 Spindle to Tailstock Alignment Test Outcome

 

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In Ted Hansens mini lathe book he uses aluminum foil shims under the front/rear of the headstock.



I really recommend this book. He goes through aligning (and improving) the Mini-lathe to create a much more accurate system, and the advertised ¡®every project only requires the Mini-lathe and a drill press¡¯ is correct.?

He¡¯s also published a few more articles in Home Shop Machinist since the book came out for further refinements



On Dec 14, 2023, at 11:03 AM, CBJessee-N4SRN <cbjesseeNH@...> wrote:

I started wondering if I could trust my 350mm MT3 test bar, so set up my indicator to zero on the top surface and ran it 10¡± to the end of the unsupported test bar (it¡¯s ~1¡± diameter) to confirm 0.008¡± deviation from spindle to 10¡± out. Then I popped the test bar out, rotated it 180 degree and mounted its MT3 taper again, with the same results. So, the test bar is pretty straight. Is it fair to conclude that the 0.008¡± rise is headstock/ways misalignment? I¡¯m mounting my indicator on top of the locked compound/locked cross slide.

I think I need only remove the control box and motor cover from the LMS 7x16 to get to all three headstock bolts. When I reassembled, I ran a bronze brush with WD-40 over the headstock surfaces to remove any paint overspray and gummed lubricant residue, wiped them well and lightly oiled before progressively snugging the bolts down.

Would the strategy be to loosen the left-end ?bolt and tighten the two right-end bolts to try and drop the tilt down?

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--?
Bruce Johnson

The less a man knows about how sausages and laws are made, the easier it is to steal his vote and give him botulism.

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