Heavy 10 spindle / 5MT
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  1. #1
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    Default Heavy 10 spindle / 5MT

    I got a 5MT backplate along with some other stuff.

    I'm looking for a Heavy 10, and I think the spindle is some sort of proprietary "short" 5MT.

    Would I be able to use a 5MT shank in the spindle?

    Just trying to decide if I should keep this for later use.

    Steve

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    5MT is quite a bit larger than the 10L taper.

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    Would I be able to use a 5MT shank in the spindle?
    From the horses mouth. Depends on if MT5 is .602 taper per foot on dia.- too bad its .631 TPF like in here

    Standard Tapers

    sb-spindle-dims.jpg

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    The H10 spindle is a proprietary taper. It has the same taper as a MT#3, but has a larger diameter (1.628" at the large end). Your MT#5 backplate won't properly fit (if at all).

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    The proprietary South Bend Taper No3 is close to #5mt, but shorter. There's some other threads on it here somewhere with specs, but you need to search it up.

    I believe at least some if not all heavy 10's use it. If you look at Miller fabrication's webpage down to test bars it lists it from 10's to 16":
    Products – Miller Machine and Fabrication

    The mt5 is not interchangeable with it though. I do recall a thread here maybe from 2012 or earlier where a guy had one crammed in in claimed it was ok , but no, its not.

    I've got both South Bend No3 and 5mt test bars, the mt5 isn't going in there.

    Some specs of South Bend tapers here:
    Getting Another South Bend 16x6 Operational

    Going back a little further in the thread to post #96 there some discussion on the tapers too:
    Getting Another South Bend 16x6 Operational

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    I believe you'll find that a #5 Morse taper fits some of the 12" Chinese lathes--Grizzly Gunsmith lathe for example. It's not going to fit a South Bend 10"

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    See post #3

    If 5MT is .631 and SB is .602, the 5MT is off OVER .002 on dia per inch

    Or as so well stated in Post #4

    Your MT#5 backplate won't properly fit (if at all).

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    Quote Originally Posted by johnoder View Post
    From the horses mouth. Depends on if MT5 is .602 taper per foot on dia.- too bad its .631 TPF like in here

    Standard Tapers

    sb-spindle-dims.jpg
    I hadn't zoomed on your pic, I thought is was a chart from your "standard tapers" link.

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    Thanks guys. That clears it up.

    If anyone needs a 5MT backplate, let me know.

    Steve


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