Standard size Arbor "Running Bushing" for Horizontal Milling Machine?

JRock1000 · Apr 18, 2019

Is there a standard size Running Bushing for Horizontal Milling Machines?
I'm building an overarm support for a VN22L.
Most of my cutters are for 1 1/4" arbors and a few are 1" (or smaller).
Planning to make the arbors (and spacers / Running Bushings)for them as well, 40 Taper arbors.
Getting to be time to bore the hole for the arbor bushing.
I'll be making a few arbors, but I also want to be able to use standardized tooling in case I come across any great deals.
Thanks!

johnoder · Apr 18, 2019

Come in multiple ODs (since there are big and little horizontals) and multiple IDs for the arbors

My 2CH K&T uses 2.125" for OD

rustytool · Apr 18, 2019

My K&T 2HL uses 1-7/8 OD running bushings.

JRock1000 · Apr 18, 2019

Thanks!
Good to know.
I was leaning towards 1 3/4" (cause I have a bar of 01 round Stock that size).
I've got a bunch of cutters already, and most of them are 1 1/4" arbor hole.

johnoder · Apr 18, 2019

JRock1000 said:
Thanks!
Good to know.
I was leaning towards 1 3/4" (cause I have a bar of 01 round Stock that size).
I've got a bunch of cutters already, and most of them are 1 1/4" arbor hole.

They DO have to be a bit larger than whatever the spacers are on that 1 1/4" arbor

JRock1000 · Apr 18, 2019

What's the OD on the spacers, on your 1 1/4" arbor?
Got a stub arbor with the machine. 1" arbor, 1 3/8" spacers.
Got a major flaw though. Left Handed thread on the arbor nut.
I could just run it in reverse EXCEPT, the drawbar threads on right handed

Does that stand to reason that the spacers on a 1 1/4" arbor would be 1 5/8?

johnoder · Apr 18, 2019

EXCEPT, the drawbar threads on right handed

I will suppose you refer to holding arbor in spindle.....makes no difference at all since the face keys in spindle nose take care of the arbor coming loose.

If you refer to HOLDING arbor/spindle while tightening - make yourself a hook spanner to engage those same keys - or the adjacent slots in the arbor

Or put it the lowest speed and engage the clutch.

The arbor gets snugged up, not tightened to beat the band. The KEY drives the cutter - not how tight the arbor nut is

Does that stand to reason that the spacers on a 1 1/4" arbor would be 1 5/8?

Measure them and then you will know. Suppositions from the readership won't necessarily make things come out right

JRock1000 · Apr 18, 2019

johnoder said:
I will suppose you refer to holding arbor in spindle.....makes no difference at all since the face keys in spindle nose take care of the arbor coming loose.

The Drawbar spins loose in the spindle, then, although the face key does drive it, it has play in the Y axis. Not safe.

johnoder said:
The arbor gets snugged up, not tightened to beat the band. The KEY drives the cutter - not how tight the arbor nut is

No key in the stub arbor.

Why would they even make a left handed arbor? The only advantage would be the ability to cut from right to left without Climb Milling.
I think the disadvantages far outweigh that. Unless you made up a drawbar that threads on LeftHanded as well.

johnoder said:
Measure them and then you will know. Suppositions from the readership won't necessarily make things come out right

I don't have a 1 1/4" arbor, or have access to one. That's why I'm asking.

I assume one of ya'll Practical Machinists might.

Cal Haines · Apr 18, 2019

According to the Van Norman Attachments, Arbors and Accessories catalog, their 50-taper arbors had a 2-1/8" bearing and the 40-taper arbors used a 1-7/8" bearing.

Cal

JRock1000 · Apr 18, 2019

That's Great! Thanks!

Miguels244 · Apr 20, 2019

I have three supports...I’ll measure them when I get home next week.

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Standard size Arbor "Running Bushing" for Horizontal Milling Machine?

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