Standard size Arbor "Running Bushing" for Horizontal Milling Machine?
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  1. #1
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    Default Standard size Arbor "Running Bushing" for Horizontal Milling Machine?

    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!

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    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

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

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    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.

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    Quote Originally Posted by JRock1000 View Post
    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

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    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?

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    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

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    Quote Originally Posted by johnoder View Post
    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.

    Quote Originally Posted by johnoder View Post
    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.

    Quote Originally Posted by johnoder View Post
    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.

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    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

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    That's Great! Thanks!

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

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