[Rainman229]

Well after finally getting A working tool changer/drop out setup working. I Started checking out the play in machine since it's been run hard over the last 5 years.
And found i have over .005 run out on the spindle. Hoping its just the bearings. It has been noisier lately now that i think of it.


Anyone know The part numbers for the bearings? Would like to upgrade them rather then replace them with ones from grizzly.

[cbeath]

I will be very interested in your replies. I have an SX3 (converted to CNC) which has an MT3 spindle (common in UK, Australia and New Zealand) but am sick of having to bash the draw bar to remove a stuck MT3 tool. So I have been researching changing the spindle to an R8 spindle (sourced from Grizzly)
There is good information on removing/refurbishing the SX3 spindle on Arc Euro Trade website in the UK. (Engineering Tools | Lathe | Milling Machine | Model Engineering | arceurotrade.co.uk), and they also have information on the bearings, and sell what they claim are superior bearings as well (expensive!). They also offer a refurbishment service, but said they couldn't replace my MT3 spindle with an R8 one.

I enquired with SIEG in China whether I could buy a complete replacement spindle and bearings already fitted in a new spindle sleeve, but they responded saying that the accuracy of the machine would be seriously effected - I presume the spindle sleeve must be individually machine to fit each headstock?
The taper bearing is a Koyo 32907-J2 - 35*55*14mm, thrust bearing is a 30*47*11mm and the top spindle bearing is also a Koyo 6006 2RS - 30*55*13mm
Interested to hear from anyone else that has replaced the bearings and/or spindle in an SX3
Chris

[neilw20]

Well after finally getting A working tool changer/drop out setup working. I Started checking out the play in machine since it's been run hard over the last 5 years.
And found i have over .005 run out on the spindle. Hoping its just the bearings. It has been noisier lately now that i think of it.

Anyone know The part numbers for the bearings? Would like to upgrade them rather then replace them with ones from grizzly.

Using TTS tooling? Is the end of the spindle runout 0.00? Does it need a grind?
http://www.youtube.com/watch?v=nZOCa...qZc1PQ&index=5

http://www.youtube.com/watch?v=1dw-B...qZc1PQ&index=6

http://www.youtube.com/watch?v=5CKje...qZc1PQ&index=7

http://www.youtube.com/watch?v=0nyw_...qZc1PQ&index=8

[Rainman229]

neilw20

That some good info.
But i had Play in the bearings. Shouldn't have really said run out. When i put a dial indicator on the on the spindle i can Hand push the spindle .005 in either direction of X and y.
I changed out the bearings as i had a set i didn't know about laying around. Did the trick.

Now to play with my power draw bar