Member postings for RICHARD BIRD 1

Here is a list of all the postings RICHARD BIRD 1 has made in our forums. Click on a thread name to jump to the thread.

17/02/2022 17:14:49

I recently acquired an M250 with a rusted and stuck 3 jaw scroll chuck. Now dismantled and cleaned it is an iron 3 jaw scroll chuck, 6.5" diameter, mounting D1-3, with ID plate missing. The mounting plate was taken off the chuck body by the previous owner, and it lacks the M10 bolts. The plate is 20.6mm thick and the holes 34.8mm deep, what length should the cap head bolts be?...I guess they need to be grade 12.9 and 50mm long.

More interestingly, and the main question is that this chuck has an oiler hole, but despite a thorough clean I could not find the outlet. No oil appeared inside the chuck, so I took the oiler out to find a blind hole!! Photos attached. Has anyone information about this? Many (most) chucks don’t have an oiler, so one answer will be ‘do nothing and don’t oil this way!’. However the base of the hole is close to the recess at the inner diameter of the body, where it houses the jaw side of the scroll. Pratt supply a heavy chuck grease, and others on this forum have suggested a light oil that leaves a thin wax film for lubrication. With this in mind, any ideas about what size the passageway should be would be welcome.

Thanks

Richard

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