- Joined
- Jan 22, 2022
- Messages
- 128
I just wanted to share this because I was surprised a self centering 3-jaw chuck could be this accurate.
Long story short I figured this Pratt Burnerd chuck was junk. It came with my Clausing Colchester 13”. It was hard to move the jaws in spots. I opened it up today, cleaned and greased it. In that process I leaned it had 4 adjacent screws that pressed on the backplate that worked like a 4 jaw chuck.
I got it dialed in to about .001”. I verified this with another gage pin. That’s about the same as my Hardinge-Sjogren Speed Collet Chuck!!
Anyways. I’m very happy about this and figured I’d share if there was any other amateurs out there that didn’t know about the adjustment screws.
I also stamped a mark on the backplate to ensure it’s mounted on the same pins every time.
View attachment trim.CBF7B398-9A91-41CB-A99B-3D5DF4442A8C.MOV
Long story short I figured this Pratt Burnerd chuck was junk. It came with my Clausing Colchester 13”. It was hard to move the jaws in spots. I opened it up today, cleaned and greased it. In that process I leaned it had 4 adjacent screws that pressed on the backplate that worked like a 4 jaw chuck.
I got it dialed in to about .001”. I verified this with another gage pin. That’s about the same as my Hardinge-Sjogren Speed Collet Chuck!!
Anyways. I’m very happy about this and figured I’d share if there was any other amateurs out there that didn’t know about the adjustment screws.
I also stamped a mark on the backplate to ensure it’s mounted on the same pins every time.
View attachment trim.CBF7B398-9A91-41CB-A99B-3D5DF4442A8C.MOV