MT1 cutter arbours

[Peter Ellis 5Participant @peterellis5]

Hi

I need some 1 Morse Taper milling cutter arbours. Does anyone know who stocks them, please ? I checked ARC, Chronos and Rotogrip, but couldn´t find any. They used to be quite widely available. I´ve Imperial sizes, and 6mm, but need some larger, e.g. 10mm, metric ones.

Cheers

Peter

[Peter Ellis 5Participant @peterellis5]

[bernard towersParticipant @bernardtowers37738]

I had the same trouble late last year and found one at chronos and two at rotagrip. in the end rotagrip refunded as no stock and got one from chronos. The other possibility is to try Millhill Supplies as sherline is 1 mt. In the end I opted for a 1mt ER16 collet chuck as I already use that size collet. So far it has been ok.

[Peter Ellis 5Participant @peterellis5]

Thanks Bernard. I´ve emailed them.

Cheers

Peter

[David George 1Participant @davidgeorge1]

I bought a No 1 morse taper ER16 collet set from RDG Tools. A while ago.

David

[Trevor Drabble 1Participant @trevordrabble1]

Peter, Suggest you try Beaufort Ink in Devon who are advertising an 18 piece ER32 collet system on a No 1 MT for £129.95.

[Howard LewisParticipant @howardlewis46836]

I was going to suggest getting a 1 MT ER collet set. You can then mount, within reason, any size of cutter fro which you have a collet.

As a guide,ER25 will take up to 16 mm diameter shank cutters.

Howard

[DC31kParticipant @dc31k]

Posted by Trevor Drabble on 21/03/2022 10:15:58:

…ER32 collet system on a No 1 MT ….

Is ER32 on MT1 not just a little ambitious?

Another option is a soft blank arbor and make your own. RDG sell MT1 ones with an M6 thread in the back for a drawbar. Chronos sell tanged oned slightly cheaper should you want a different drawbar thread.

If you are tight on headroom on the machine, this is likely to be the shortest solution. If you go for the ER option, clearly, the bigger the ER-number, the longer the overhang.

[Roger WoollettParticipant @rogerwoollett53105]

Gloster Tooling do variious ER collet chucks on 1MT. I have an ER20 chuck and collets from them.

[old martParticipant @oldmart]

I would go for the er16 which holds up to 10mm which is a good maximum for MT1. you may have to make a drawbarif the threads do not match your existing one, easy with threaded studding. Rather than getting a full set of collets, it might be better to get them individually in the sizes which you are going to use. The shank diameters of any imperial ones would have to be converted to metric to find which sizes cover them. I remember seeing for sale on ebay, 50mm shell mills with a MT1 arbor which had been custom made in the USA. Alright for milling plastic, maybe.

[Peter Ellis 5Participant @peterellis5]

Posted by Howard Lewis on 21/03/2022 15:55:08:

I was going to suggest getting a 1 MT ER collet set. You can then mount, within reason, any size of cutter fro which you have a collet.

As a guide,ER25 will take up to 16 mm diameter shank cutters.

Howard

I already have a 1MT collet chuck and collets. I am looking for more dedicated arbours.

I agree that I could make some out of blanks, which might be a better solution, as I could thread them internally, as well, to suit threaded cutters.

Cheers

Peter

[bernard towersParticipant @bernardtowers37738]

Peter, Out of interest I Have made a nut threaded with the spindle thread on my sherline mill so with the No1 MT er16 collet chuck fitted and drawerbar tightened the nut on the spindle thread can be spun down to contact the collet chuck making it more rigid in the same way Clarkson did for their No2 MT collet chucks as they felt that the taper a bit flimsy for hard work.

[DC31kParticipant @dc31k]

Posted by Peter Ellis 5 on 21/03/2022 21:09:51:

…I could thread them internally, as well, to suit threaded cutters…

Think very hard before you proceed along this road.

The cutting forces will tend to tighten the cutter making removal difficult unless there is a retractable stop at the back end.

How will you ensure alignment or fit between the thread and the reamed bore such that the two are not fighting each other in keeping the cutter concentric?

In a Clarkson-style chuck, the thread just stops axial movement of the cutter. The removable nose allows easy removal.The cutter is kept concentric by the centre at the end and the fingers of the collet.

AIUI, Clarkson-style cutters have a 20 tpi Whitworth form thread on them regardless of shank diameter (see: https://www.model-engineer.co.uk/forums/postings.asp?th=50573). You can take up the challenge of finding a 10mm x 20 tpi tap or attempt to internally screwcut it…

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