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Backplate suppliers?

Backplate suppliers?

Hi all.

I need a part-machined CI backplate for my Viceroy (which is metric, so I can't do the threading myself....) - same fitting as a Boxford: 1-1/2" x 8TPI.

Any pointers to which of the "usual suspects" has decent quality/tolerance registers in particular? It's for a collet chuck, so I do want it to be close fitting and register repeatably.



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Re: Backplate suppliers?

Hi I think both RDG, Chronos and probably Arceuro  list a Boxford backplate, you can always send it back if you are not happy with the quality,  I’m assuming the register on a Viceroy is same as a Boxford.  I fitted a Collet chuck to my Boxford a few years ago now think it was ER40 I was never happy with it and I took a lot of care machining the register. 


Ashley (Remap Volunteer look us up  The best volunteering opportunity for practical people)

Ashley Slater
709 Posts
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Re: Backplate suppliers?


Cost wise there is very little difference between most of them.

I use RDG for mine, which are either Myford or D1-4, whichever fitting I require.

The accuracy rests on your shoulders, once the front face of the backplate has been brought to perfection, then you need to get the register within say a thou.

What I tend to do is bring the chuck register down to within a couple of thou, then VERY carefully skim down, finishing off with a piece of emery stuck to a stick.

It isn't the register you have to worry about but the collet nose, which no matter which type they are usually slightly out. I get around that problem by toolpost grinding the nose. Once I have done that, I can get zero runout or a couple of tenths at most, depending how accurate the collets are.


John Moore
115 Posts
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Re: Backplate suppliers?

So the first one I bought (CI backplate for a Boxford/Viceroy spindle nose which has a 1.500" register) came in at 1.4975" so didn't fit at all - no problem, swapped out, and the replacement comes in at around 1.524" which is something of a rattle fit, so really not much use for a collet chuck.
Maybe I'll have to make my own after all, and splash out on a tap...<sigh>.
I will try again with the supplier though, and see if they can improve on matters.

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Re: Backplate suppliers?

You'd have been better off sticking with the first, undersized one, and polishing it out, as suggested above. A loose fit on the register is useless, its the fit of the backplate on the register which ensures concentricity. Unless you are prepared to rough out the thread to the closest metric equivalent, and then  finish it off with a tap, you won't be able to easily cut a 1 1/2"  thread from solid with a tap.

Try John Ward (Latheparts). He makes backplates which will fit.

Richard Wilson

Richard Wilson
Charge Hand
28 Posts
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Re: Backplate suppliers?

Thanks Richard.

Got in touch with John Ward, and he'll help me out, and most importantly absolutely got the point about the importance of register fit, which the original supplier totally didn't, despite a long conversation with them about it.


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