Making a Milling tool Arbor

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Darren:
Thanks for all the kind comments guys ....

Even though it turned out well enough I wasn't entirely happy with the end result.

This being how far the cutter was extended from the arbor and machine bearings. A lot of leverage there to induce vibrations. In truth it seemed to work well enough, but it was bugging me all the same ....
Here we have an ER32 arbour/collet holding the milling cutter arbour. The facing edge of the cutter is about 8" from the spindle.

So what I had in mind was a dedicated ISO30 arbor that the cutter fitted to directly ...
Except of course no such thing exists .... :bang:

So I'll have to make my own then ..... :dremel:

At first I thought of setting the compound slide over and cut the taper that way. I'd done this before for a short MT2 arbor.
But then this lathe has a taper turning attachment ..... Ooooh, new territory for me .....
In for a penny ......

First job was to study the taper unit and clean it as it was covered in thick oily gunge. Thankfully this has protected it well over the years and it seemed to be in fine condition.

This little fitting is taken off the end of the crosslide screw to disconnect it...

And used here to connect the crosslide to the taper unit

Now the taper angle needed setting. This is 1" per foot or 16.7112 degrees. Thankfully the taper unit scale has both sets of markings and 1" sure is easier than the other.
Once set I used another arbor and a dial gauge to check and tweak slightly.

Having now lost the crosslide adjustments the compound needs to be set over to 90 deg for feeding in.

Having satisfied myself with the workings and how too's the machine was re-set back to normal. Except of course for the taper unit angle, that was left alone

Darren:
A chunk of that tough steel should be perfect for this application ... :ddb: So a section was cut with the fiber cut-off saw. (not wishing to repeat the hacksaw teeth removing exercise)

Mounted in the 3 jaw and one end machined down to 17mm, This will later be turned to 16mm and threaded for the cutter.

Now it can be turned around and mounted in a collet. This end was turned to 31.4mm which is the thick end of the taper.

End section for the internal thread.

And now for the taper, the machine was re-set and ...........................................................oooooh the nerves .....

Went without a hitch, not a murmur ..... bit of an anticlimax really ....

Turned around to cut the thread, 16x1.5mm

Here's the thread, not as bad as the picture would have you believe, looks rough but it's not.
At this diameter this steel like to be spun fast to cut properly. 1200rpm is way too slow, my next speed is 2500rpm at which I get a chrome like finish.

But there is no way I'm gonna do any threading at 2500rpm, not on your Nelley ... so this will have to do ....

And the cutter fitted

Darren:
Looks good dunit :) :) :)

Here it is compared to the ER32 holder with a cutter in it. As you can see my new arbour is shorter .... :)

Now the moment of truth.
All the time I was turning the taper I had nothing I could test the angle with as it was being made and adjust as needed .... Fingers crossed ..... :med:

I marked the surface with several marker pen lines and fitted it to the milling spindle. Just in, quick turn and out ...

Oh was I chuffed, my heart could start beating again ..... you couldn't ask for better than that :)

Now it looks very reasonable

A close-up

I'm over the moon with the result, truly I am .................. :mmr:

bogstandard:
Isn't it nice when things go right?

John

Darren:
Certainly is John..... and without people like yourself to guide me along with all your little tips and projects, I'm sure the result may have been quite different :zap:

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