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Harold Hall's precision grinding table
David Jupp:
Quite a lot of metric sizes in the UK are simply imperial sizes quoted to nearest mm, or sometimes nearest round number of mm. When we went metric, companies didn't thow away all the old imperial sizing dies. It's been long enough now that some stock may well be 'genuinely metric' from the start.
Start from these approximations, but think carefully if there are critical design dimensions that need to be 'spot on'.
3mm ~ 1/8" ; 12 or 13 mm ~ 1/2" ; 25mm ~ 1"
xo18thfa:
--- Quote from: David Jupp on June 27, 2011, 12:00:16 PM ---Quite a lot of metric sizes in the UK are simply imperial sizes quoted to nearest mm, or sometimes nearest round number of mm. When we went metric, companies didn't thow away all the old imperial sizing dies. It's been long enough now that some stock may well be 'genuinely metric' from the start.
Start from these approximations, but think carefully if there are critical design dimensions that need to be 'spot on'.
3mm ~ 1/8" ; 12 or 13 mm ~ 1/2" ; 25mm ~ 1"
--- End quote ---
That's what I did. Did not run into any problems. The only critical dimension is the dovetails. You can either go "spot on" or "fit the next"
Chuck in E. TN:
Bob (xo18thfa),
I have a noob question on the dovetails. I had it in my mind that the lower slide was 1" stock, and that's what I got. I've already cut the piece for the lower slide, so I can't return it. My question, if I make the lower slide (drawing 4) from 1" square stock, can I make up the difference with a thicker gib strip? Or do I have to bite the bullet and get bigger stock? I have already completed the slide swivel pieces (drawing 9), except for the dovetail cuts, as I have not received the dovetail cutter yet.
Chuck in E. TN
Chuck in E. TN:
Never mind. Found a block of 2"x2"x3" I'm cutting down now.
Chuck in E. TN
Chuck in E. TN:
For those that have built this table, I'm a bit confused on the parts that fit to the lower lead screw nut (drawing 16). What is the 6 mm hole at A for?
Also the parts that assemble to the lower slide (drawing 4), what fits in the 12 mm slot? The lower lead screw nut is 9 mm dia.
Chuck in E. TN
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