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Studer type OB Cylindrical Grinder

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Gray25/03/2010 18:01:51
983 forum posts
7 photos
I acquired this machine as part of a workshop clearance deal about a year ago and have been slowly restoring it.
In general, it is in excellent condition considering it was manufactured around the late 1940's, in fact it is like a good Swiss watch!.
I have the original instruction manual which is good as far as it goes however, some of it is is german and some of it is a little sparce on detail, assuming prior knowlendge of such machines.
 Whilst I understand the principles behind cylindrical grinding and its uses, if anyone has any experience inthis area or of this machine, all input will be much appreciated.
The intended use is for finish grinding of small engine crankshafts and taper tooling to suit my exisitng workshop machines.
The machine came with an extensive range of collets which appear similar to 5C collets and I intend to make a lathe chuck to utlilise these. If anyone knows the exact details of these collets, closing thread, head taper etc etc, that info will be greatly received.
Nick Kempley 120/05/2018 23:44:00
9 forum posts


I see noone replied to this post. I have the same machine and was lucky enough to get lent a whole raft of stuff by the last known Studer engineer in UK. I had it all scanned to PDF. These are mostly drawings, with which you have to be very careful as I discovered when I ordered a replacement bearing based on the drawing only to find that it was for a later version......

The standard heads take Schaublin W20 collets, which are a deal smaller than the 5C you quote, though owners seem to have messed about with heads so my normal head is clearly from another machine (possibly an OA) and takes smaller collets, though I do have a facing head that takes W20, not that I have any! Mikron T90 collets are the same size, but coarser thread. Both use buttress threads, unlike the 5C. I sold my Mikron and the collets went with it....

I particularly like the taper capability. I've used it a fair bit, but perhaps that's really only once a year on average! Useful when you need it though.

Let me know if you still need help with this.


Gray21/05/2018 07:19:12
983 forum posts
7 photos

Hi Nick,

thanks for the reply, I was beginning to think I was the only one with one of these machines!

I would very much appreciate a copy of the pdf's. (will send a pm with my email

Yes I did discover that the collets are W20. I have a fairly good range of sizes that came with the machine that suit most of my needs. The drive motor on mine was shot as was the base casting huge crack which spread as we tried to weld it, and the bearings in the rear part of the belt drive assembly. The machine has been much modified so it now has a direct drive to the wheel head but retains the flat belt drive to the work head and sits on a new welded steel cabinet. Do you have a source for flat belts?


John Haine21/05/2018 07:56:19
2458 forum posts
132 photos

When I had an Aciera milling machine, the guy who runs Anglo Swiss Tools helped me find a source of flat belts.


martin perman21/05/2018 08:03:11
1550 forum posts
66 photos

There are several agency's in the UK for Studer grinders, I worked on them in the 70's as a machine tool fitter with Lucas CAV.

Martin P

Nick Kempley 112/06/2018 18:10:42
9 forum posts


I didn't notice your request for details of belt supplies. I have used Habasit belts. If you call them and tell them the details of the installation they will work out the best belt for the application and tell you which dealer it can be bought from. I seem to recall mine came from one in the west Midlands, possibly Worcester. The surprising thing is that good modern narrow belts work better than wider ones. The original main drive belt was 50mm wide, which I first replaced witha modern one of the same width, the 25mm one I'm using now is much better.

I sent you an email about the full drawings DVD, but perhaps it went into your spam, or your reply went into mine!


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