- Joined
- Dec 25, 2011
- Messages
- 591
I finished my change gears for my SB 9A to cut metric threads using the QCGB. They are made from aluminum but work well.
I made the compound gear 47/37 instead of the 127/100 and they are so small that I could not get enough adjustment to get them to engage so I made another stud and bushing for the banjo to use another idler gear. When you add another idler it changes the feed direction of the lead screw (duh).
Anyhow I tried a couple of them out (1.5mm and 1mm) and they were right on. I just set the QCGB to the SB metric thread plate. I don't cut metric threads often but it was a good learning project.
I made the compound gear 47/37 instead of the 127/100 and they are so small that I could not get enough adjustment to get them to engage so I made another stud and bushing for the banjo to use another idler gear. When you add another idler it changes the feed direction of the lead screw (duh).
Anyhow I tried a couple of them out (1.5mm and 1mm) and they were right on. I just set the QCGB to the SB metric thread plate. I don't cut metric threads often but it was a good learning project.