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Thread: Parting off with small lathe
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15th Aug 2018, 05:25 PM #1China
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Parting off with small lathe
I have a project which involves parting a piece of 60 mm stainless steel, my metal lathe is a small item AL 50g ( 9x20 )I did this several years ago and used a hacksaw NEVER AGAIN, I am going the parting off method this time. several people have said I would not be able to do this on such a small lathe.Well me being me I am going to do it anyway, I know to have it on on dead center, plus parallel to the work and to go slow anything else I should be aware of.
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15th Aug 2018, 05:46 PM #2Senior Member
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60mm stainless is a bit of an ask
If your lathe can run in reverse, you might try putting the tool in upside down, I have found that works pretty well.
Also your chance of success may depend on the type of parting tool. There are parting tools and there are parting tools.Regards
Bradford
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15th Aug 2018, 06:05 PM #3Philomath in training
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Stainless commonly work hardens, so you need a decent rate of feed. On a small lathe that could be an ask. It also needs to be kept as cool as possible, so some form of coolant is a must.
Michael
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15th Aug 2018, 07:15 PM #4China
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Thanks for the replies, I will take note and let you know what transpires
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15th Aug 2018, 07:21 PM #5
Hi China,
Good luck ! Even in mild steel a 30 mm stick out on a relatively thin blade is a big ask.Best Regards:
Baron J.
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15th Aug 2018, 07:45 PM #6Most Valued Member
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Good luck, cos you will need it.
This is what will do it dead easy. A friction disc will cut it like a piece of cheese:
https://www.youtube.com/watch?v=nYD5KbFA6EQThe worst that can happen is you will fail.
But at least you tried.
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16th Aug 2018, 08:34 AM #7
I don't know if your lathe has an automated, crossfeed.
If it has not, you must hand feed at a constant rate.
I part off up to 25 diameter 304 on a regular basis. For that, I use a 20mmx 3 HSS. The taper from top to bottom type.
I use the sulphurised lube that is very thick. It helps to stop the lube being spun off.
That sizing is the absolute limit on my 12x 36 as the toolpost flexes.
I wish you good luck. Do wear your safety glasses, as I feel you may need them.
Grahame
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16th Aug 2018, 10:46 AM #8Most Valued Member
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Good point about the safety glasses Grahaeme.
Parting off and using HSS drills on the lathe always makes me nervous. HSS can literally grenade under duress and I've had a large splinter of drill bit stick well into my forearm (through my heavy work shirt) on one occasion. Same thing with the drill press. When that stuff goes bang, it's not good.
Play safe guys.The worst that can happen is you will fail.
But at least you tried.
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16th Aug 2018, 11:16 AM #9Member: Blue and white apron brigade
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The most significant thing that has improved my parting off ability has been to use "T" shaped cross section parting tools.
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16th Aug 2018, 03:36 PM #10China
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Thanks for all the replies, I here you all, I chickened out and took it out the lathe and cut it on the cut off saw re chucked and cleaned it up
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16th Aug 2018, 03:44 PM #11Senior Member
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That's what I would have done.
Quicker, easier and less stress.Regards
Bradford
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16th Aug 2018, 05:56 PM #12Philomath in training
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Probably the best option.
Michael
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16th Aug 2018, 08:50 PM #13
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