Mostly by chance I acquired a 1938 SB 9C (manual apron) and after doing the ILION renovation and repainting, I've been slowly adding more tooling for it.
I've just bought a 4 jaw chuck and adapter plate from Little Machine Shop. The adapter plate needs to be machined to fit the chuck.
So my first two questions are:
1) The boss on the adapter plate needs to be 0.0001" - 0.0008" smaller than the chuck. Since I don't have a 3-4" micrometer, is it even remotely possible do this with a digital caliper? My inexpensive digital caliper goes to the nearest .0005".
The machinists I knew in my small town all up and moved so I don't have anyone at the moment to borrow from and I doubt I'll ever have another use for a 3-4" micrometer.
2) The chuck adapter is already threaded but the threads look kinda ugly. I don't have any experience machining cast iron, so maybe this is normal? see photo
My background: back in the early '80s I worked as a machinist/technician building cyclotrons and experimental apparatus for the physicists. Oddly enough, they didn't tend to use cast iron for cyclotrons.
I've just bought a 4 jaw chuck and adapter plate from Little Machine Shop. The adapter plate needs to be machined to fit the chuck.
So my first two questions are:
1) The boss on the adapter plate needs to be 0.0001" - 0.0008" smaller than the chuck. Since I don't have a 3-4" micrometer, is it even remotely possible do this with a digital caliper? My inexpensive digital caliper goes to the nearest .0005".
The machinists I knew in my small town all up and moved so I don't have anyone at the moment to borrow from and I doubt I'll ever have another use for a 3-4" micrometer.
2) The chuck adapter is already threaded but the threads look kinda ugly. I don't have any experience machining cast iron, so maybe this is normal? see photo
My background: back in the early '80s I worked as a machinist/technician building cyclotrons and experimental apparatus for the physicists. Oddly enough, they didn't tend to use cast iron for cyclotrons.