Gallery, Projects and General > Project Logs
Set-Over Centre
Fergus OMore:
As the late and and lamented George Thomas would remark 'It does look as if it has been gnawed by rats'
At this point, you have two obvious faults. The first is that your collet chuck is NOT designed to accept a larger diameter than that specified to accept and secondly, it is not supported.
Somehow, the chamfer tool is wrong as it is one for brass and I wonder what the rest of the set up is.
If you think about it carefully, you are using a split collet and the whole thing is able to rock about 'like a pea on a drum'
Others may disagree but that is their prerogative.
Fergus OMore:
I occasionally look at the postings on 'Homeshop Machinist'. There is an interesting discussion on taper turning in the General section.
Some of these posters are quite expert with wide experiences. No further comment from me on what was written. However, it is worth more than a cursory look.
DaveH:
Norman.
The early and quick DaveH replies; the collet is an ER collet designed to hold machine tools like end mills in a ridgid and precise repeatable manner.
Provided it is tightened correctly on a nice round surface it should not be a major cause of problems.
:beer:
DaveH
Fergus OMore:
However there is a dreaded overhang of metal far in excess of the collet diameter.
Quite simply, he should change to his three jaw chuck and keep the collets for what they are intended for- the right size.
The work should be then supported, prior to putting a proper lathe tool to work.
I remain adamant, sorry!
wongster:
Thank you guys for you comments and encouragement. I just finished a long day at work.
Norman, I was under the impression that the ER series of collets provide repeatability rigidity within its limit when used for workholding in the lathe. That's why I bought it. What would be the right size?
Anyway, I did swap in the 3 jaw chuck on Sunday night for a quick session. A fresh piece of silver steel was used. Same finish. I'll try to angle the tool differently in my next session. The HSS tool is still rather sharp.
On the "chamfering tool", it is but a Proxxon roughing tool placed at an angle.
Regards,
Wong
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