partingoff

This topic has 10 replies, 9 voices, and was last updated 23 August 2013 at 12:46 by JA.

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22 August 2013 at 21:00 #6836
mick70
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@mick70
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22 August 2013 at 21:00 #127613
mick70
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@mick70
just got some decent holder and tips from arc today.

had a go with parting off toll i got just cant bring myself to do that last little bit as worried its going to fly off somewhere.

am i just being daft?

what is correct way please?
22 August 2013 at 21:07 #127615
Alan .204
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@alan-204
For me it's like playing with snakes, appantly you just have to go for it.

Al.
22 August 2013 at 21:19 #127618
Boiler Bri
Participant
@boilerbri
Low speed, sharp tool on centre line Or a thou or two below, Lots of coolant or cutting oil (pumped or hand placed) come off the cut and back out occationally to clear the swarf, bob's your uncle.

Bri
22 August 2013 at 23:08 #127634
jason udall
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@jasonudall57142
I would worry more about losing the part than ending up wearing?it. Make a part catcher (plastic tube works well)
If using tailstock during parting off reduce pressure at the end or it may catch
23 August 2013 at 06:12 #127637
Thor 🇳🇴
Participant
@thor
Follow the guidelines given above. If you still get into trouble maybe a rear mounted parting off tool (mounted upside down)? You will find a photo of a rear mounted tool here.

This subject has been discussed before on this forum, just do a search.

Thor
23 August 2013 at 06:34 #127638
mick70
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@mick70
Posted by Alan .204 on 22/08/2013 21:07:18:

For me it's like playing with snakes, appantly you just have to go for it.

Al.

thats not a prob for as ikeep quite a few snakes.
23 August 2013 at 08:41 #127646
Gordon Wass
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@gordonwass
I suppose it depends on how big and heavy the end is, and how fast it's running. If it looks like it is starting to bend then stop and use a hacksaw for the last bit. Same thinking as cutting a tree branch with a chainsaw, stop before the saw gets trapped.
23 August 2013 at 09:09 #127651
Michael Gilligan
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@michaelgilligan61133
As Gordon said

There is no shame in using a hacksaw for the last little bit

… it just makes more work, tidying up the ends.

BUT do remember to protect the lathe bed !!

MichaelG.
23 August 2013 at 10:50 #127663
Russell Eberhardt
Participant
@russelleberhardt48058
Another couple of points:

Speed, about 1/4 of that for normal turning.

Steady feed, keep it cutting.

Al said it's like playing with snakes. Well, if you're working with brass it should hiss like one.

Suds or cutting oil for steel, dry for brass, parafin for aluminium.

Minimise overhang and don't use the tailstock centre.

Sorry, that was more than a couple but it's not as difficult as it sounds. Just go for it. Practice first before doing anything critical.

Bonne chance!

Russell.
23 August 2013 at 12:46 #127669
JA
Participant
@ja
Plus a little bit of the obvious.

Make sure that the parting off tool is truely square to the work. It is easier to part off to a hole. This gets rid of the final little pip that can give problems and allows a rod, smaller diameter than the hole, mounted in the tailstock to catch the parted off item.

The worsed experience I have had is a largish parted off item jamming between the chuck and the bed. Nasty big bang.

JA
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