Parting on the lathe

[ARM]

Good luck and get back on the horse (so to speak).[/QUOTE]
Rick
Hi
Good advices freely given and much appreciated as well.
Only thing is overcoming the fear factor to rein in the bucking horse !!!
Thanks for the encouragement.
aRM

 

[ARM]

Did anyone mention that parting off is/can be one of the most frustrating $@#$^&* things to do - especially on one of the smaller lathes!!:bitingnails:

You mentioned the chatter, and this in itself can be a contributing factor in parting. Chatter usually indicats looseness/slack some where (unfortunately its also more common on smaller less rigid lathes) Check your gibs on the apron, cross and compound slides, the slightest looseness will transmit to the contact point of the cutter bit and give chatter, Snug them down tighter just for the parting job - locking the apron and compound.

My 13" lathe will do parting with seldom a problem, but the 9x20 can give me heartache sometimes.

Pacer
Like we said earlier, ours is quite a sturdy Tool Room 1 metre Bed machine with Power Feeds etc. The Apron was locked.
What we do realise is that the crashing was definitely due to user error. We need to get our act right. And right from the beginning !!!
aRM

 

[ARM]

From another forum this migth help:

http://www.homemodelenginemachinist...-tungsten-carbide-partoff-tooling-long-10176/

Kind regards

Farfar

Farfar
This was very good link U directed us to.
We think we would seriously like to try out that Iscar Toolings which seems better than our Mitsubishi carbide stuff.
Looked at their site as well with the Tang-grip ( or something like that ) and was taken aback with the speed and fluency of the cut.
The local Supplier did say that their 4mm Inserts were the most popular.
Ideally would like what Neils uses - the combination 2mm and 4 mm dual insert Blade !!!
aRM

 

[ARM]

Usually I power feed to part. Less chance of hardening the material due to it not carrying off the heat as it is removed. chicken and egg thing though if everything isn't right and you don't know it, it can get expensive. How would you know just beginning?

Steve

The only way to really know is to have a go at it and use power feed.
Now, no chicken heart but Brave heart will have to give it a shot !!!
Ideally we would like to get those Iscar Blades and Inserts. They are impressive beasts and will tame any part - no pun intended !!!
aRM

 

[ARM]

AMS, Good info above. Sounds like you had good basic setup. Close to chuck, tool on center, flood coolant, etc.


Depending on your lathe, size and condition, 3 mm may be a bit wide for a 50 mm round cutoff.

Just a few more possibilities, to maybe help or confuse you even more.

Ed Hoc

Ed
The local industry standard seems to be a 4mm wide Insert.
Our 1 metre Bed Machine would amply cope with that, so we think ???
We used 2 mm on 303 Stainless a long while earlier.
No crash boom bang !!!
aRM

 

[swatson144]

The wife and I did well this year she wanted something and I wanted a china made parting tool. We agreed to buy what we wanted and call it from the other. My shars parting tool came in while I was home and just had to have a QC check.



whipped out a 5c collet stop part and tested the parting tool and found it good.

Steve

 

[Que]

I turn the cutter over and run the lathe in reverse. chips fall away and can't build up.as someone has alreay stated; I start to part off and then finish with a hacksaw. face off the part to length and all is well.

 

[Tony Wells]

I've used Iscar part-off tools for years and will continue to use them. I have tried a few others but never found one to outperform the Iscar. You may want to look into something along these lines:
http://www.iscar.com/Ecat/familyHDR.asp?fnum=373&app=51&mapp=TG&GFSTYP=M&type=1&lang=EN

 

[ARM]

whipped out a 5c collet stop part and tested the parting tool and found it good.

Steve[/QUOTE]
Steve
Why the wasted part ???
See U not even flooding Coolant et al !!!
It is definitely "the singer not the song"
Thanks for making time to post
aRM

 

[ARM]

I turn the cutter over and run the lathe in reverse. chips fall away and can't build up.as someone has alreday stated; I start to part off and then finish with a hacksaw. face off the part to length and all is well.

Now that's what we would call lateral thinking, although we would ideally prefer doing away with the Hacksaw !!!
Thanks for another ingenious idea
aRM