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Modifying An Arbour fitting

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Darren:
I recently acquired an ER32 arbor that "almost" fit my Beaver mill. Almost as in it needed slightly modifying.

Here it is on the left in this picture. It's a BT30 fitting and I needed an INT30 fitting as the one on the right.
The only important bits are the slots for the spindle dogs to locate into to give it something to drive.



Initially I set it up like this. A 5C collet fixture in the vice holding a bar and the Arbor to be machined clamping same bar to secure it.
It almost worked but there was a little too much vibration for my liking.



So I ended up just holding it in the vice as shown, Here I'm machining a flat on each side so I can grab it with a wrench for changing collets.



Using the two new flats I was able to index 180 deg for machining the dog location slots.



I'll have to wait until I have made some dogs, or is it keys  :scratch: to see if I have removed enough metal. But I'm sure it will be fine.

Brass_Machine:
So nice to have tools that can make (or modify) other er... tools! eh Darren?

Eric

Darren:
It's a question of funds Eric,

This arbor cost me a fiver instead of about £40.00, and included a £15 bearing type nut at the same time.

So it was modified and saved me a packet.

As long as it works I gain some self satisfaction at the same time.... :dremel:


Expect more home made tooling yet. plenty I don't want to part good cash for.... :thumbup:

bogstandard:
Darren,

If you ever get stuck with a bit of tooling that you can't machine because it is too hard, if it is just straight grooves or whatever, that can be done on the surface grinder, or the lathe with the toolpost grinder, then put it to one side, and bring it along on your next visit.

I had to modify a 5MT to 2MT adapter for the lathe, so that I could get a drawbar thru it. It wasn't just hard on the surface, but all the way thru. Grinding was the only way to do it.

John

John Stevenson:
Nuffin wrong with home made tooling.

One of my customers makes drilling and boring machine for North sea rigs and they have standardised on BT40, there big CNC lathe spits blanks out like no tomorrow so I bought about 12.

Very handy for odd weird jobs.

Last night I did a MT4 arbours 8-1/2" long so the drill and cutter fitted in the end stuck out over the cross slide and saves me winding in and out to reach the work every time.

When finished this arbor will drill a 5mm hole, face the end off a piece of 12mm square and put a countersink in all in one operation.

OK takes a while to make but I have 500 of these to do, what would have been three separate operations is now down to one.

Whilst I was setup I also ran 4 extra blanks off.

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