Dumpster_diving
Cast Iron
- Joined
- May 18, 2017
- Location
- Massachusetts
I just picked-up a used Albrecht Sensitive Drill Chuck.
The unit has a graduated collar (marked 0, 10, 20, 30, 40, and presumably after one full revolution 0=50). The collar is just above the chuck and below the ring used to grasp the sensitive feed portion. Seems like the collar may be part of the Albrecht chuck portion of the mechanism and not necessarily related to the sensitive feed portion of the mechanism. The collar is split and held in place with a flat-head screw (so presumably able to be calibrated by rotating). On mine, when fully closed (i.e. no drill in the chuck) a scribe mark on the chuck corresponds to the '40' graduation. Not the '0' or '50' graduation.
The question is this. I'm struggling to figure out the purpose/use of the graduations. I'm thinking perhaps to indicate how wide the chuck is opened. Perhaps to show what size drill bit is currently held in the chuck. But that's a SWAG. 0-50 correspond to wire drill sizes?
Anyone used this graduated collar feature?
The unit has a graduated collar (marked 0, 10, 20, 30, 40, and presumably after one full revolution 0=50). The collar is just above the chuck and below the ring used to grasp the sensitive feed portion. Seems like the collar may be part of the Albrecht chuck portion of the mechanism and not necessarily related to the sensitive feed portion of the mechanism. The collar is split and held in place with a flat-head screw (so presumably able to be calibrated by rotating). On mine, when fully closed (i.e. no drill in the chuck) a scribe mark on the chuck corresponds to the '40' graduation. Not the '0' or '50' graduation.
The question is this. I'm struggling to figure out the purpose/use of the graduations. I'm thinking perhaps to indicate how wide the chuck is opened. Perhaps to show what size drill bit is currently held in the chuck. But that's a SWAG. 0-50 correspond to wire drill sizes?
Anyone used this graduated collar feature?