- Joined
- Sep 10, 2013
- Messages
- 562
Hi All
I have a mod “3910-5” 5c chuck made in Polland”did a search and it came back to a Bison with out the yellow medallion with the buff on it. I thought these were really good chucks? It is mounted on a D1-4 back plate that has less than .0002 run out on the face. It was machined on my PM-12x36t that has 0 spindle run out and only has about 10 hr use. Got it last June 2018. I can see the nose on the chuck with out collet wobbling. I measured it with my .0005 Sterrett DTI and it has .025+ tir inside the tapper. It almost looks like the back surface is not perfectly perpendicular to the bore of chuck. Any ideas how to get it running true. I thought about clamping a 1” ground drill rod in my set true 3 jaw with less than .0002 run out on a 1” mill. Then turn the mating surface on the back of the chuck, but not real sure about the collet, it is Shars pression collet. I was woundering if it can be sent back and referbished? It is an older used chuck. Perhapes it would be better to just scap it and look for a newer chuck. I realy hate to toss a Bison 400.00 chuck.
CH
PS There is no burs or dings on the surfaces that are critical. Or on the back plate fresh machined and has not been off the spindle
I have a mod “3910-5” 5c chuck made in Polland”did a search and it came back to a Bison with out the yellow medallion with the buff on it. I thought these were really good chucks? It is mounted on a D1-4 back plate that has less than .0002 run out on the face. It was machined on my PM-12x36t that has 0 spindle run out and only has about 10 hr use. Got it last June 2018. I can see the nose on the chuck with out collet wobbling. I measured it with my .0005 Sterrett DTI and it has .025+ tir inside the tapper. It almost looks like the back surface is not perfectly perpendicular to the bore of chuck. Any ideas how to get it running true. I thought about clamping a 1” ground drill rod in my set true 3 jaw with less than .0002 run out on a 1” mill. Then turn the mating surface on the back of the chuck, but not real sure about the collet, it is Shars pression collet. I was woundering if it can be sent back and referbished? It is an older used chuck. Perhapes it would be better to just scap it and look for a newer chuck. I realy hate to toss a Bison 400.00 chuck.
CH
PS There is no burs or dings on the surfaces that are critical. Or on the back plate fresh machined and has not been off the spindle