The Shop > Tools
Sieg Super C3 bearing change
John Rudd:
I posted some time ago that I treat myself to a new minilathe...
After taking delivery and asking one or two pertinent questions it was time to strip clean and install some new bearings.
The job from start to finish has taken some three weeks, from purchasing new bearings, receiving advice and finding time and the good health needed, it is all back together and I'm rather pleased. :D
I've put together this as a project with photos and a bit of a commentary on what was done, I hope you like it...
So to kick off, I've cut out the boring bit like how I stripped it down to the last nut and bolt..and move right on to the rebuild...
Here's a couple of shots of the bearing outer races installed in the headstock
John Rudd:
Next up, the spindle. The original bearings were standard ball races and as such were a press fit onto the shaft. Their removal shouldn't challenge any of us on here...
However, as I'm changing these for taper rollers a slight adjustment of the bearing journals is required to allow the inner races to 'slide' on the shaft to enable the correct amount of preload to be set. This required the spindle to be mounted between centres on the lathe and the journals polished with a fine abrasive paper until the new bearing race would be a tight slide on with a hand push fit...
After polishing the shaft it was treated to a good wash in solvent to remove all traces of grease and abrasive prior to adding the chuck end dust cover and bearing...
John Rudd:
Next up, the drive end race added along with the dust cover.
....the spindle was offered up into the headstock housing and the other bearing added.
Now the fun part....
The orignal bearings were 16mm thick, the new ones are slightly thicker at approx 1.6mm.
Thsi means that the drive pulley and the spur gear are out of alignment with their respective counterparts....
There are two plastic spacers fitted as part of the spindle assembly...Obviously these need 'madmodding :dremel: to accomodate the extra thickness of the two bearings....
John Rudd:
The spindle on the later minilathe is slightly different in make up...
There are several items that fit on the shaft and obviously need to be in the right place...
As the spacers were made of plastic, in true Madmodder spirit, new ones just had to be made from metal :coffee:
Apologies for the out of focus shot on this one..( are there any more? ) I was in a bit of a hurry.... :doh:
John Rudd:
After a quick rummage with 'Er indoors in the garage...( oooeeerrrrr missus mind me brass bits :D )
I managed to find some aluminium bar that would do just fine....
A quick fettling in the lathe....
and we soon had two new shiny bits to add to the assembly.....
Unfortunately, the spacers had a keyway cut in them :scratch:.....Hmmm...more work :dremel:
Time for a bit of quick thinking on how to make a keyway...
Here's the setup I came up with..
A bit Heath Robinson but got the job done...
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