Thread: ISO30 or NMTB30 Slitting Saw Arbor- I'm looking for one.

I might have a spare one - I've got a decent collection of #30 tooling, but a #40 spindle in my mill
I'll try to remember to have a look through them tonight for you. I think they're most/all M12 threaded but will double check.

Or, what about turning up a couple of appropriate sized bushes and using a shell mill arbor to hold the saw?
One like this might be a good candidate...
edit: something like this: http://www.practicalmachinist.com/vb...dapter-223863/

I do have a slitting saw arbor, but it looks to have a 1/2" whitworth thread.
Is it any use to you?

I'm interested Festy.

Any chance of a snap shot?

Bob.

Sorry about the picture quality, my phone was the only camera I had handy.

So Festy,

It's interesting that these flangeless arbors relied solely on draw bar tension to secure them. Your arbor is the first that I have seen of this type. I was looking at some Hercus literature this morning and found that they offered some similar abbreviated arbors for their NMTB 30 spindled version of the No. O milling machine. Schaublin produced ISO 30 collets that functioned the same way. I was under the impression that the draw bar simply held the abor in place and the drive keys did the work hence the flange.

A couple of questions regarding your arbor. What cutter bore size does it accommodate and how much are you asking for it? PM me if you like.

Bob.

Hi Bob
I never did anything about it either...got their universal thingy instead

mmm maybe i should just get one eh ...she wont know

With the dollar being high, now is a good time

Originally Posted by Anorak Bob

I was under the impression that the draw bar simply held the abor in place and the drive keys did the work hence the flange.

I'd never given it much thought, but assumed that the drawbar always provided the vertical securing (i.e. stop the tool from falling out of the spindle) and the taper itself transferred the lateral force to the tool, or at least had a lot to do with it.

So I spent the morning reading up on various taper standards, and found the answer in ASME B5.10 "Tapers, Machine, Self Holding and Steep Taper Series".
Taper #30 is listed as a Steep Machine Taper (not self-holding), so would seem to require keyways for drive.
ASME B5.18 also indicates that drive keys are a requirement for #30 spindle noses.

So in summary, the saw arbor in question does not conform to the NMTB / ASME standard

Originally Posted by Anorak Bob

A couple of questions regarding your arbor. What cutter bore size does it accommodate and how much are you asking for it? PM me if you like.

Pretty sure it takes the standard 1" bore saws but I'll check that tonight.

I have heard of a few guys with cnc tool changes running without the keys with no problems, but they where only using 1/2 inch and under cutters.
Bob you might be able to mill some slots in it and if the keys don't reach make some longer ones?

I like the idea of this type below as it lets you get close with the recessed washer.
slitting saw arbor
Or this one
Slitting saw arbor. - mikesworkshop

Dave