Originally Posted by zeo  Paul there should be no slop what so ever. The pins pull the chuck on the short taper on the nose of the spindle D1-5 is 1/2"x3.0625"
The concentricty is all in this little taper so take care of it. zeo |
I'll apologise in advance for my ignorance, but there's no "taper" on the two (four-jaw chuck, and 10" face-plate) D1-5 6-pin devices I have. The rear "face" of the item mates directly to the "face" of the headstock. Alignment is achieved by the 6 pins, and the accessory is then secured to the headstock by tightening 6 bolts that fit the recesses scalloped in the 6 bolts in the accessory. There's no taper that I can recognize or identify.
Where would this taper be located?
The significance of this is that there is plenty of "meat" on the Jacobs Nose Spindle Chuck back for installing the 6 (or three) pins to mate with my headstock. However, keeping TIR - relative to the
center of the chuck to 0.001" or less will be extremely difficult given the machinery I have at my disposal. Since it would be only slightly less difficult for someone with access to more soihisticated machinery, I suspected that the pins, with their 'scallops', somehow centered the device.
If you can show or explain where the taper you speak of is, I will be able to "pay attention" to that when I modify the mount on the Jacobs Chuck.
Thanks,
Paul