Our club workshop pillar drill really needs a new chuck. We?ve got a keyless jobby in mind but need to get the existing chuck off the spindle. The Progress 1S spindle has a neat slot, right through the spindle, and just above the chuck. Below that is a round knurled nut that can be screwed down, presumably to help with chuck removal. We just can?t understand what the slot is for. It?s about ¼? wide and ¾? high, and there?s what looks like a block of steel full-width across the bottom. Can anybody clarify please? I?m anticipating that the mount is probably going to be JT6. It?s evident that considerable BF&BI is going to be needed to free the taper. I?d guess that it?s been on there for 50+ years. From the state of the round nut it?s evident that others have been there before us! The existing ½? chuck simply says it?s a Jacobs 34. Current-day Jacobs numbers have a suffix which identifies the mounting taper e.g. 34-06 for JT6. We?ve got a pair of wedges but initial trials indicated that a force greater than we could apply from a big toolmakers? clamp would be needed. Any thoughts? Geoff Johnson
- posted
15 years ago