I’ll chime in on the importance of a clean environment. They usually spec a ultra high purity grease for lubricant.
They also usually have a fairly specific break-in routine. I.e a pair of temperature probes, one near each bearing, then run the spindle, starting at a slow speed. Gradually increase The speed to max over several hours, all the while keeping an eye on the temps. Definitely *don’t* spin it up right away to “see how it runs.” > On May 27, 2020, at 1:32 PM, Curtis Dutton <[email protected]> wrote: > > Yes that youtube video seems to be very helpful. I've been watching it for > the last few days. > > Well we will give it a try then and see how it pans out. > > Thanks all > >> On Wed, May 27, 2020 at 2:03 PM Leonardo Marsaglia <[email protected]> >> wrote: >> >> 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 >> > > _______________________________________________ > 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
