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Model Forum / General / Models / October 2009Collets for a Myford MG12 cylindrical grinder?
Hi! Can someone help me identify the collets for a Myford MG12-M cylindrical grinder? I contacted Myford, but they don't have them, didn't answer the question what type of collet it is and pointed me to Crawford Collets. But Crawford doesn't have them. :-( The collet looks like an R8, but with different sizes: (I only have a centre, no collet at all) Length is about 68 mm Diameter of the cylindrical part is 22.2 mm Length of cyl. part is 55 mm Diameter of the conical part is 28.5 mm It has an inside thread for the drawbar with an ID of 17 mm Also a grove on the OD of the cylindrical part 3.2 mm wide and about 30 mm long. Grinder was built 1961. TIA, Nick  SignatureThe lowcost-DRO: <http://www.yadro.de> > Hi! > [quoted text clipped - 21 lines] > The lowcost-DRO: > <http://www.yadro.de> Nick, I have nothing in my Crawford catalogue.You might gain some info on this thread about a MG12. http://www.practicalmachinist.com/vb/showthread.php?t=151046&highlight=myford > I have nothing in my Crawford catalogue.You might gain some info on > this thread about a MG12. Thanks, I found that thread before. But no match. Not a 3C, not a 4C, not a 3B. And the tailstock has a MT2, not something special as some claimed in that thread. Must be a big mystery that Myford. :-) I also don't have such an collet adapter on the workhead. But maybe that would be a solution if I don't find something else. Thanks, Nick SignatureThe lowcost-DRO: <http://www.yadro.de> > Hi! > [quoted text clipped - 21 lines] > The lowcost-DRO: > <http://www.yadro.de> I have a book on an MG12, I'll look tomorrow to see if it sheds any light. John S. > I have a book on an MG12, I'll look tomorrow to see if it sheds any > light. I do have the manual. But some very fancy! Some ... idiot translated it to German and I think left out some things. Disregarding the funny expressions he used somewhere. Only the original photos and drawings are included. Also, one wheel dresser I own is missing. It has a swiveling head and an arm that carries the diamond that can be fed in and out. Nice thing for dressing to any angle. Tricky to disassemble. I even ruined a ball bearing along that way. :-) And the radius dresser I have is also missing in that manual. Looked at lathes.co.uk, but he doesn't have Myford grinders. Nick SignatureThe lowcost-DRO: <http://www.yadro.de> > Hi! > > Can someone help me identify the collets for a Myford MG12-M cylindrical > grinder? Nick It may be no help but my MG12 collets are all marked G7006 sometimes with a P after that. Additionally some also bear an "H". hth SignatureRoland Craven Nr. Exeter, Devon, UK roland@petternut.co.uk www.petternut.co.uk googled G7006P. It brings up a pdf of the Myford price-list. Text say 4C. > Nick > It may be no help but my MG12 collets are all marked G7006 sometimes with > a P after that. Additionally some also bear an "H". > > hth > googled G7006P. It brings up a pdf of the Myford price-list. Text say 4C. Nope! Not a 3AT, 3C, 3J, 4C, 5C, R8 Must be something Myford-specific (as mentioned in a thread at practicalmachinist). Seems I have to bite the regrinding or whatever to get a new center and the collets. :-( Thanks, Nick SignatureThe lowcost-DRO: <http://www.yadro.de> I have measured. They are 4C so need an internally threaded drawbar. They fit into an adaptor/closer which fits the headstock. The chuck backplates and centre have internal threads for an externally threaded drawbar. It sounds like you are missing the collet adaptor/closer and also its drawbar. I'm sure careful study of the pricelist will make it all clear. http://www.myford.com/pricelist/Grinder%20Accessories%20and%20Ancillary.pdf ttfn Roland >> googled G7006P. It brings up a pdf of the Myford price-list. Text say 4C. > [quoted text clipped - 8 lines] > Thanks, > Nick > The chuck backplates and centre have internal threads for an externally > threaded drawbar. It sounds like you are missing the collet adaptor/closer > and also its drawbar. Seems it's best when I come back after I have disassembled the complete workhead. Needs some TLC and a paintjob anyhow. The only thing puzzling me is the fact, that the centre in the workhead seems to be to no standard. Hope to sort that out with the parts disassembled and the drawings that came with. Also the 3 jaw chuck has an adapter that directly fits. Anybody has a swiveling work-head that he doesn't need? :-)) Nick SignatureThe lowcost-DRO: <http://www.yadro.de> > The only thing puzzling me is the fact, that the centre in the workhead > seems to be to no standard. Correct. Roland Hi Nick, Please checkout our website at www.jubileemactools.com where you ca buy-on-line, sellected items via PayPal. We have a vast selection of Myford accessories and spares. Thank you, regards, Andrew Pope JUBILEE MACHINE TOOLS Nick Mueller Wrote: > Hi! > [quoted text clipped - 25 lines] > The lowcost-DRO: > <http://www.yadro.de -- jubileemactoo >Hi Nick, > [quoted text clipped - 6 lines] > >Andrew Pope Can you read a calendar? Idiot. Mark Rand RTFM |
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