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Thread: File & Emery
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20th Oct 2015, 08:07 PM #1Golden Member
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File & Emery
Hey,
Just cut a couple of MT3 tapers, final finish with a shear tool - they fit nicely with no wobble but the finish isnt quite as nice as I have managed in the past.
(Finishing always seems to be a bit of a lottery for me but in the long term am trending better finishes and slowly understanding more, my best ever finish was as smooth as glass on a daggy bit of black bar using a shear tool - the frustrating thing is that I wasnt able to duplicate that this time)
I've never doe a file or emery finish on the lathe, If I try to tidy it further with a file or some emery paper do I risk ruining the overall taper shape and get a wobbly fit or is the amount taken off too infinitessimally small to make any discernible difference to the overall fit ?
Bill
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20th Oct 2015, 09:00 PM #2
finish
Hi Bill
If you are not getting a consistent nice finish with your finishing tool, there must be something wrong .
Have you tried the orthodox type tools for finishing ?
Maybe your tools are not sharp enough .
Look around for something like this , a silicon carbide oil stone , the box instructions say a light oil is sufficient but you can also soak the stone in hot petroleum jelly . I found this at a swap meet for a few bucks , it puts a very sharp edge on HSS tools .Mike
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20th Oct 2015, 10:01 PM #3
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21st Oct 2015, 03:47 PM #4Diamond Member
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Yes, this is the go !
Bruce
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21st Oct 2015, 05:17 PM #5Most Valued Member
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Using a file or emery to finish is frowned on in some circles. Just watch out for the chuck jaws with the file and maybe make up and emery stick. Its no fun with the emery wraps itself around the work if you're holding onto it.
Stuart
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21st Oct 2015, 05:43 PM #6future machinist
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I emery alot of thing at work. I would recomend using a small piece so it cannot wrap around.the workpiece 400 grit works for me.
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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21st Oct 2015, 11:33 PM #7Golden Member
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Thanks for the tips - tried a small piece of emery paper plus some cutting oil - did the job fine.
Yes Morrisman you are probably right - probably something wrong with the shear tool that I didnt notice but I always wanted to try this emery caper cos I'd read about it so much in old books and magazines.
I get the impression that lots of people do this but it is often warned against in books or a manuals. The other one I wonder about is grinding on the side of the wheel - I get the impression that this too is widely practiced but formally frowned upon. I have used the side of the wheel at times.
I drilled out the taper today and fitted a threaded bar through it - am making one of those fancy George Thomas backstops for a chuck - was ever so chuffed when my two drill holes met inside the workpiece. I knew it was theoretically possible but thats always different to actually doing it.
Bill
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22nd Oct 2015, 07:04 AM #8Philomath in training
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Emery in the lathe is warned against for two reasons I can think of - one is that loose grit can fall onto the lathe bed and so abrade it over time, the other is that if the emery gets caught and wraps around the job, you could be wrapped with it. The side of the wheel thing is probably more about undercutting the peripheral surface which may then chip/ spall and all the fun things that go into a cracked and/ or out of balance wheel.
Like most things which you should not officially do, it is as much about being careful about what you are doing and how often against what the consequences are. A light touch on the side of a grinding wheel occasionally would be completely different from using it as your primary grinding surface on a daily basis. (There is a different type of grinding wheel available if that's your thing).
As for using emery, on one forum I mentioned doing that and it was implied that the world was about to end and it would be my fault because of my actions - and then one of the more respected contributors came along and said he did it all the time and what was the issue, at which point opposition melted away...
Michael
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22nd Oct 2015, 08:30 AM #9Most Valued Member
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24th Oct 2015, 09:35 PM #10Golden Member
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