I've never took apart the ones in the Mazak (Wich I asked for quotation once)but I disassembled other lathes that were similar and it's not that much of a pain. Surely you must make some tooling sometimes to get things done right but nothing else.
5.000 to 7.000 sounds about what they would charge for it. From what I remember the tricky part is to guarantee a free dust and grit assembly. They claimed to have a dust controlled environment much like a semiconductor factory but I suspect part of that is marketing. One common approach for big lathes is two double row roller bearings with a thrust bearing for the axial load. Leonardo Marsaglia El mié., 27 may. 2020 14:51, Jon Elson <[email protected]> escribió: > On 05/27/2020 12:18 PM, Curtis Dutton wrote: > > So after finishing the retrofit of the old Miyano gang lathe the spindle > > bearings are shot. You can grab the spindle nose and push it side to side > > about .0005" to .001". The cut quality is also fairly bad. Just cutting a > > spring pass on an aluminum bar shows a lot of chatter like marks. > > > > I can also measure a .0005" to .001" axial play by pushing on the face > or > > the collet closer of the spindle. Not to mention there is roughness and > > fairly loud bearing noise while running. > > > > I expected this but I'm looking for someone that can refurbish it or any > > advice from others that have done this before. I haven't ever sent > anything > > out to be rebuilt so I'm ignorant on the process. > > One online quote I received was 4500 to 6500. Is that reasonable? Does > > anyone know of someone or have pointers? I'm not opposed to trying to do > it > > myself but I know it would be very challenging to get it right. I'm sure > > I'd need to order 2 sets of bearings... One for the first attempt and one > > to get it right! > > > Well, it may not be that tricky. It is probably just a pair > of angular contact precision ball bearings, > and may have some type of spacer to get the preload right. > Do you have any drawings of the > headstock? That might give some idea of how the spindle is > assembled. > > Jon > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
