I'm currently fixing a number of issues on my recently acquired Colchester Bantam 800 lathe; one of the problems I've found is that the gear on the thread dial indicator has a tooth missing. I don't think that it's repairable as it's some form of white metal (Mazak perhaps?) so I need to make a new one. I've read of people using a tap as a hob for worm wheels and it occurred to me that this might work for this application but I'm wondering if it's going to be difficult to cut with an Acme form tap; the second problem would be where to get a 1 1/8" x 4 TPI Acme tap for a reasonable price. The gear is 16 teeth and circa 1 1/4" in diameter. Martin
- posted
15 years ago