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Help with odd milling machine spindle taper

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Tony Zuiderwyk21/05/2019 07:31:20
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I recently purchased an Adcock & Shipley horizontal milling machine, model 1AD, built in 1949, in Leicester. It has made it all the way to Australia, and despite its age, it is still going strong and I am very happy to have it. My question: the spindle taper looks very much like an American National Standard, but it is too big for an NT30 and too small for a NT40. I measured the taper at 3.5" per foot, which is consistent with the NT series. The small end of the tapered section is 20mm dia, the large end is 35mm, over a distance of 50mm. I have heard that there was a brief period where an NT35 was part of the standards. Could this be a rare example of the 35 before it was discontinued? This is a fine machine and I am lucky enough to have arbors for 7/8, 1 and 1 1/4 inch milling cutters. I've been unsuccessful in finding any other tooling to fit the spindle taper - it looks like I will have to make arbors for my metric bore tooling. Any help or suggestions greatly appreciated. Thanks, Tony

Michael Gilligan21/05/2019 07:51:54
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13827 forum posts
603 photos

This may help a little, Tony: **LINK**

https://www.cnczone.com/forums/uncategorised-metalworking-machines/71862-nt35-taper-bt35.html

MichaelG.

John Haine21/05/2019 09:01:14
2591 forum posts
133 photos

**LINK** ?

Tony Zuiderwyk22/05/2019 12:22:52
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Thanks. Expensive stuff.....BT35 and NT35 seem to exist, but not common. I will have to turn up what I need. Another project on the 'to do' list....or I'll just resort to the Chinese vertical mill for when I use the metric bore tooling (and in particular the involute gear cutters).

Still not 100% sure if that is what A&S built into this mill. I thought perhaps someone in the UK might have some experience with these vintage mills and be able to confirm.

Bazyle22/05/2019 12:37:30
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4688 forum posts
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You might be able to turn down a 40. I have a 30 taper that didn't seem to fit and wondered if it was a 25. Then I noticed it had been broken at the eject slot and brazed together again, then turned down but that made it too small.

Hi Speed Scrap22/05/2019 15:24:18
22 forum posts

Tony, where in Oz are you? They are commonly used in larger hi speed routers I see in Melb

You want BT or NT? ER32?

Tony Zuiderwyk23/05/2019 00:08:45
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Posted by Hi Speed Scrap on 22/05/2019 15:24:18:

Tony, where in Oz are you? They are commonly used in larger hi speed routers I see in Melb

You want BT or NT? ER32?

I'm in Melbourne. The taper on the machine is definitely of the NT (or NMTB if you prefer) form. I gather that a BT taper can fit an NT spindle, with some changes to the draw bar (not a big deal). I was after some positive confirmation from someone who had one of these machines, that the spindle is indeed NT35. I have looked high and low, but have not found any standards listing the dimensions for a NT35 (yes, I can find details for the BT35).

Ideally, I need an arbor for the machine that will take 22mm metric bore milling cutters. I doubt one exists on the planet, so I'll make one. In addition, if I can find a taper shank that will hold an ER collet (say, ER32), I'd be happy to have one; I suspect this will have to be a modified BT35 from the CNC world. (supply/demand seems to put the price of a BT35 much higher than the more common 30's and 40's).

IanT23/05/2019 03:26:09
1299 forum posts
132 photos

Tony,

I've not heard of an NT35 taper before - but I do have a Victoria H0 mill with an 1_3/8th N.S. taper - which was (I believe) a wartime standard. It also sits in between the NT30 and NT40 taper sizes. The dimensions you are giving don't seem to match this taper but I thought I'd mention it's existence as I've found it very hard to get information on this taper and it is not well known.

Just a thought...

Regards,

IanT

Hi Speed Scrap23/05/2019 04:18:07
22 forum posts

Tony, Have sent you a PM

Tony Zuiderwyk23/05/2019 05:22:12
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5 forum posts
3 photos

Finally worked out how to include photos with the post. So, this is the taper on the arbor. I've also included a sketch of the dimensions - these are 'as measured' so will be near but not exact, for example, the angle is most likely to be 16.59, indicating that it is a standard 3.5" in 12" taper.

Interesting to hear about the 1 3/8 taper. Wartime standard, could have easily found its way into a machine in 1949 I suppose.

adcock and shipley mill 1ad spindle taper 1.jpg

adcock and shipley mill 1ad spindle taper 2.jpg

adcock and shipley spindle taper.jpg

IanT23/05/2019 13:25:38
1299 forum posts
132 photos

Tony,

I have a .png drawing of the NS taper (which also includes the 30/40/50 tapers) and gives their relative dimensions. The 'G' measurement - the top end of the taper, for the NS taper is 1.375" which is 34.9mm - so this seems to suggest this taper.

I cannot post .png images here but if you pm me - I will email you the image.

Regards,

IanT

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