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tom senior m1 arbour

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terry callaghan23/09/2013 22:34:37
237 forum posts
10 photos

Hi chaps.can anyone who owns a tom senior please let me if the arbour should have a keyway in it.i cant work out what holds the cutting wheel in arbour does not have a keyway, and I was told that pressure on the side of the cutter face keeps it in place.this cant be right can it . Michael

ronan walsh24/09/2013 00:59:36
546 forum posts
32 photos

Hello Terry


I have a tom senior, and two different size horizontal arbours for it , 3/4" and 1". Both have keyways running along their entire lengths, 1/4" off the top of my head. No way would the pressure of the nut hold a horizontal milling cutter in place while cutting , even with light cuts.

Edited By ronan walsh on 24/09/2013 01:00:39

Alan Jackson24/09/2013 10:06:29
260 forum posts
146 photos

Hi Terry, Ronan,

Not wishing to contradict but my Tom Senior M1 has a 1" horizontal arbour without a keyway and I have no trouble clamping horizontal milling cutters sufficiently just using the nut, which, does not have to be more than just nipped up to drive the cutter. Admittedly I mostly use fairly thin section cutters i.e. slitting saws etc and this has the advantage of letting the slitting saw slip (tongue twister) rather than breaking the saw blade.


RICHARD GREEN 224/09/2013 11:57:18
327 forum posts
192 photos


I fully agree, I've used large horizontal mills for years without using the keyway, used large cutters with no problem at all, the keyway would possibly be an advantage in some cases but not 100% necessary, however, I would use the keyway for very heavy cuts.

I've got 2 Tom senior M1's , I've used the horizontal arbor a few times but have never needed to use the keyway.


Stub Mandrel24/09/2013 13:22:39
4315 forum posts
291 photos
1 articles

Surely, sawing stainless steel stock several slightly slack slitting saws should sometimes slip safely, substantially saving some shattered saws - circumstances suggest skimming surface slows slicing.

colin hawes24/09/2013 13:30:31
560 forum posts
18 photos

I spent many years on toolroom machines of all sorts.With this sort of work a key is unnecessary and model making is similar. Only on production work where a mill is driven to it's limits of strain is a key essential. Under those conditions the hardened arbour nut can explode with the winding up strain, especially with a gang of large cutters, if no key is fitted. We used to have a guard over the arbor nut anyway. Colin

Alan Jackson24/09/2013 20:19:57
260 forum posts
146 photos
Posted by Stub Mandrel on 24/09/2013 13:22:39:

Surely, sawing stainless steel stock several slightly slack slitting saws should sometimes slip safely, substantially saving some shattered saws - circumstances suggest skimming surface slows slicing.

Now that is as fine an example of alliteration as you will ever get in the model world. Surely superflous to suggest otherwise,Top marks Stub

Bazyle24/09/2013 20:51:37
6390 forum posts
224 photos

Unfortunately this seems to be common practice in industry which is why my arbors have a massive amount of scoring.

colin hawes25/09/2013 10:20:03
560 forum posts
18 photos

What Bazyle says is quite right and some cutters are not chamfered at the ends of their bore which exacerbates the problem if they slip; however many horizontal mill arbours don't have a keyway.The main problem here is that if the cutter does slip due to excessive overload it can tighten the nut and make it very difficutt to undo,largely because some arbours that are driven by taper friction have no spanner flats at the taper end to grip it tightly enough to make good use of a long spanner at the nut end.

If you have a keyway some of the spacers need a keyway too to enable their use on thin cutters. Colin

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