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How to remove SX2L R8 spindle screw (while converting to tapered bearings)

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iafilius:
Hi,

I'm half-way (hopefully) of converting my Sieg SX2L R8 mill to tapered  bearings, but one screw holds me to go any further at this stage.

While converting to tapered bearings, they need more space, and basically my plan was to turn the spindle a little bit off on the lathe (4mm) (which is the extra space the lower bearing takes. ultimate plan is to keep pulley at the same height, as there is not much room to adjust.
The crew cap is only about 3mm from the bearing shoulder 9see photo's) , and not knowing how hard that screw is, i want to get it out before i start on the lathe.

I'm afraid the screw may be glued, as there is no way to get grip on the screw (it's turned off before putting it together it seems)

Has any of you done this before of perhaps any idea's?

Regards,

Arjan

Stilldrillin:
Hi Arjan.

The "screw", is a pressed in plug. I levered it out, from the bore........

Have a look here....... http://madmodder.net/index.php?topic=4754.0

Good luck!  :thumbup:

David D

iafilius:
David,

Thanks a lot for your swift information.
Until you pointed it out i didn't find any r8 taper bearing mod before.
Good to see i'm on the same path by turning the r8 spindle off.

I'll have a little thinkover on how to press the peg out without damaging the r8 spindle.
Regards,

Arjan

velocette:
Hi Arjan
Have you considered Angular contact bearings instead of taper roller bearings.
A straight swap no machining or fabricating shields or seals.
By what I have read this is an excellent modification.
It is possible to have the inner race on the taper roller bearing ground shorter to fit correctly.

Eric

iafilius:
Hi Eric,

Thanks for your suggestion, I did consider angular contact bearings, the type i needed for lower 7007 (62x35x14mm) in precision class costs around 150 euro's although you can get 7007's for 16 euro's as well.

Having thought over life expectancy/stiffness/allowable load my choice was to have it tapered bearings, with the knowledge i wasn't a just a bearing swap. Actually the outer bearing races (upper/lower) are already pressed into the milling head.

I may change my mind, I ordered even a spare R8 spindle in case i want to go "original" (read messed-up the old spindle) , but at this stage i still want to go for tapered.

Thanks,

Arjan

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