I'm looking at purchasing a scroll chuck soon, but having difficulty with the thread size.
I have an old (very old - late 1800s) metalwork lathe that I am using for woodturning. The lathe came with a few chucks, but the self-centering chuck is a huge metalwork jobby that weighs about 10kg, and I'm concerned about using it long term.
I'd like to get a nice Vicmark or Teknatool style chuck to replace it, but unless I'm measuring wrong, I can't get a threaded insert to fit my lathe.
Measuring the lathe, the drive thread is roughly 15/16 of an inch diameter. It's actually tapered slightly, 24.5mm (31/32") down to 23.5mm (15/16") at the end. The thread is 8TPI. 1" seems to be a pretty standard size for the drive thread, but mine is definitely less than 1". Now, my question is...Is it common for a 1" drive thread to measure less than 1"? Or have I got some weird non-standard thread that's not going to fit anything? I would think it has to be some sort of standardised thread, as I have a couple of different non-original chucks.
I have an old (very old - late 1800s) metalwork lathe that I am using for woodturning. The lathe came with a few chucks, but the self-centering chuck is a huge metalwork jobby that weighs about 10kg, and I'm concerned about using it long term.
I'd like to get a nice Vicmark or Teknatool style chuck to replace it, but unless I'm measuring wrong, I can't get a threaded insert to fit my lathe.
Measuring the lathe, the drive thread is roughly 15/16 of an inch diameter. It's actually tapered slightly, 24.5mm (31/32") down to 23.5mm (15/16") at the end. The thread is 8TPI. 1" seems to be a pretty standard size for the drive thread, but mine is definitely less than 1". Now, my question is...Is it common for a 1" drive thread to measure less than 1"? Or have I got some weird non-standard thread that's not going to fit anything? I would think it has to be some sort of standardised thread, as I have a couple of different non-original chucks.
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