Conrad Hoffman
Diamond
- Joined
- May 10, 2009
- Location
- Canandaigua, NY, USA
I was cutting some fine metric threads for the first time on my Logan, but suspect this applies to SB and other lathes as well. Reading on the 'net about 127/100 and 47/37 gear sets, all seems simple and easy. It probably is for 1mm and easy division pitches. Silly me. What I discovered is that for fine threads, say 0.35mm pitch, there are only a few possible combinations of gears, and of those, there are combinations that simply can't be made to fit and/or engage without interference. I ended up cutting several new change gears I didn't have, and remaking various spacers and fasteners, so I could get the teeth engaged without collisions. This is just a warning to anybody contemplating very fine metric threads to really think about the gear train and clearances.
On a similar topic, I was hoping to someday stumble across a cheap used Starrett gear vernier. Apparently that's not going to happen. I just saw the new price- why in the world is a 456 gear vernier way over a thousand bucks???
Best,
Conrad
On a similar topic, I was hoping to someday stumble across a cheap used Starrett gear vernier. Apparently that's not going to happen. I just saw the new price- why in the world is a 456 gear vernier way over a thousand bucks???
Best,
Conrad