Hello:
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On Wed, Dec 4, 2024 at 11:45 PM, John Hutnick wrote:
... do not quite understand some of the comments ...
@John: Julius will do ...? 8^¡ã
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I'm sorry, my command of the english language is rather limited.
Specially in technical matters.
... what I suggest.
... 3 or 4 of the original type shaft collars ...
I was on my way to doing exactly that when I realised that they were ?25 and the U3 column ?28.
... few dollars each one ...
... of little consequence.
In my case, the consequence depends on the total cost.
There are steep shipping charges and import taxes for me to pay.
A bad local currency/US$ exchange rate makes things worse.
... clamp the rounded end in your chuck, and bore to 28mm.
Clamp the rounded end securely enough to bore 25mm -> 28mm I will surely alter the original diameter.
ie: deforming it, like if I were clamping it around the ?25mm rod but without the rod.
The resulting ?28mm will be off center (and probably not round) with respect to the mounting holes.
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I once had a similar clamp made for me at a shop.
The chap making the piece (an old timer kind enough to let me watch the process and explain) emphasised that the slit was the last thing to do.
... drill out the outside holes up to 10mm ...
Yes, that can most probably be done albeit with the proper precautions.
In small steps, I guess.
eg: 8.25 / 8.50 / 8.75 and so on or with a stepped drill from below (?).
... not satisfied ...
... throw out the pieces, nothing much lost.
I beg to differ, see above.
... then buy something else.
Or maybe look for a different solution, like my previous post?
You clearly have much more experience that I.
I'd appreciate your comments on it.
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That said, in my opinion there is a reason for this problem not ever getting solved without great expense or complications.
eg: the severe limitations posed by Emco's quill holder / headstock adapter design and cost cutting measures.
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The Heminway Kits, UPVLA (and maybe others) never gained much momentum.
Even with a high market price there was demand for them but in both cases a limited number were made.
It has proven all but impossible to find usable traces of them on the web. eg: flyers or instruction sheets.
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Maybe they did not work as well as intended / advertised?
No idea, I have not seen reviews.
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Thank you for your input.
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Best,
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JHM
Bill in OKC too