Member postings for eric fritz

Sadly I haven't got a drawing but I do have the (unfitted) tumbler mechanism and could take measurements or scans if that'd help. My measuring instruments are limited - I have a micrometer, a set of digital calipers, a Mitutoyo DTI and the usual rulers and so on. No fancy kit like surface plates, sadly.

What I'd really like is a copy of the bits of the instructions which I'm missing - notably the gear ratios. But I expect someone smarter than I could sit down with the drawings, leadscrew pitch (I imagine someone knows that) and scans and figure things out.

If you take a look at the 2 photos I uploaded to my album, they have the two pages of the gear ratios which I have, there's another half-page of additional gear ratios I'm missing.

Of course what I really should do is put all the stuff I posted to the Hobbymat mailing list on my website - that includes a really nice cleaned-up PDF scan of the lathe manual which is very easy to read when blown up to A4 size!

Edited By Phil Pemberton on 08/08/2023 16:58:05

For the purposes of threading what the tumbler gears do is effectively make it easy to add an extra idler gear in to the gear train then revert to normal RH threading afterwards. Unless you are going to be doing a lot of LH threading then reverting to RH a modification that allows you to add an idler gear into the gear train, when the odd occasion requires it, would be a simple solution. If you are planning to do a lot of feeding outwards when facing or towards the tailstock when surfacing this may be all that is required.

Martin C