Buying manual mills and lathes for a VoTech shop

Joe Henderson · Nov 4, 2022

Wells Index used to offer to rebuild BP heads and entire machines. I don't know it they still offer that but it's worth a try. Hass used to offer a manual lathe I think but even good imports are expensive.

michiganbuck · Nov 7, 2022

I just wrote this for another thread so should also post it here.
Drawing at 10x scale.
A very good way to visualize part-to-cutter contact is to draw a part at 10 x scale, with the intended insert also drawn (or whatever the subject of investigation).
So the 1" dia lathe held part would be drawn a 10" circle..to see how the insert .187 drawn at 1.87" and set at part centerline has or does not have proper clearance.

A 5-minute drawing exercise can show a lot.

Every machine shop class student should be given this assignment.
( I had Smith Hughes vocational machine shop and was not given this important exercise.) You can trig it, but that will not have as much impact as drawing it yourself.

note: Careful drawing with a sharp pence at 10X can show .001

Toolmaker51 · 2023-01-19T01:40:38-0600

michiganbuck said:
I just wrote this for another thread so should also post it here.
Drawing at 10x scale.
A very good way to visualize part-to-cutter contact is to draw a part at 10 x scale, with the intended insert also drawn (or whatever the subject of investigation).
So the 1" dia lathe held part would be drawn a 10" circle..to see how the insert .187 drawn at 1.87" and set at part centerline has or does not have proper clearance.

A 5-minute drawing exercise can show a lot.

Every machine shop class student should be given this assignment.
( I had Smith Hughes vocational machine shop and was not given this important exercise.) You can trig it, but that will not have as much impact as drawing it yourself.

note: Careful drawing with a sharp pence at 10X can show .001

note: Careful drawing with a sharp pence at 10X can show .001
Many will find that hard to believe, until countered with the logic how every mold was drawn, detailed and so built, especially dependent on use of shrink rules. Not just plastic molds, everything. Rubber, cinder blocks, phenolics, aluminum, glass, lead;........ all depending of course on the end use determining precision required.

john.k · 2023-01-19T02:02:10-0600

Theft from school machines is nothing new.....back in the 70s/80s Id buy Colchester Students and Bantams from govt schools with the tailstock quill missing,or even the whole tailstock..............ebay and facebook have made theft very easy and profitable ......put the pics online,if it doesnt sell ,then dont bother stealing it.

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Buying manual mills and lathes for a VoTech shop

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