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BallBearings and gears on miniMill XJ9512(aka xj12 / fervi-t058 /...)

Exploring miniMill spindle bearings solutions/altenatives

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pfav13/06/2010 09:07:46
3 forum posts
Hi all,
I just subscribe the forum, and I am a novice.

I start metalworking in support to my interest on Kites.
2 years ago, I bought a mini lathe (C3 like) and after one years a minimill.
 
I bought a 2nd hand minimill that is the same as XJ9512 (WARCO -- italian version is FERVI T058).
 
Using slitting saw I broken spindle gear.
 
I start replace the gears and I'm thinking to use metal gears on spindle and plastic on counter-shaft.
 
After remove the spindle I found a problem: bottom bearing is damaged (may by some metal or plastic garbage inside the bearing ).
Looking mill head assembly,  let me say "It is normal !".
 
I try to find a replacement  and for an SKF 7206 AC I have to pay Euro 150.00!!!
 
Now, some considerations.
The bearing position require a sealed version, but the 72xx model doesn't have sealed version.
The tapered version, more cheap, has the same problem.
There is not space to use sealing ring !
 
Considering the overall machine precision, SKF customer service suggested me to use 2 6206 2ZR. The maximum axial load is around 200Kg and a skf ball bearing is more precise of a Chinese 7206!
 
What do you think about my ideas on gears and bearings?
 
regards
Paolo


Peter G. Shaw13/06/2010 11:46:45
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1531 forum posts
44 photos
Hi pfav,
 
The other thread on which you posted the exact same question probably gives as much information as is available.
 
FWIW, my machine uses the 7206AC lower, 6206RZ upper as standard, but MarcuSweden is, I think, using the 30206Q for the upper and either the 32206BJ or 32206 QCL7 for the lower, however apparently the 32206 is slightly wider so the shaft is slightly lower so the top bearing only has about 70% contact.
 
Apparently as well, the 32206 handles more power than the 30206, but the 30206 is a considerable improvement on the originals.

The above info is extracted from the other thread.
 
Regards,
 
Peter G. Shaw
Clive Farrar13/06/2010 21:09:57
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125 forum posts
41 photos
please see the dissassembling the x2  mill thread for the bearings I have used.
They are open and were only £6 each
 
regards Clive

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