Cutting speeds
Turbo Mini Forums

In order to save a bit of money I've brought myself a lathe of ebay, it worked out slightly cheaper than paying a machine shop. Anyway it's been a good 10 years since I did my EA1 & EA2 and although I've still got most of my notes (going to start going through them this evening) I can find anything on cutting speeds and was wandering if anyone knows the speeds for steel & aluminum?

Thanks

Rob

There is some useful info on here:



Scroll down past the general stuff.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

theres a formula i have , its in an old 1948 book ,
it says ft/min for high speed steel and stainless steel is 50
carbon steel 60
cast iron ,mild steel,wrought iron ,80
brass 200
aluminium 300

then take that no ,
and go cutting speed /quarter dia of work =rpm .
so eg
4 inch mild steel
80/1=80 rpm.

this may all be horribly dated .
regards robert

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Cheers guys; that formula took a few goes to get my head around but then I realised that the cutting speed is in feet & the diameter is in inches.

have a play with this, green cells are inpyuts yellows outputs.

forget that i can't upload it, pm me your email rob.

Edited by Joe C on 19th Mar, 2008.

TBh it all depends on the condition of the lathe. Best thing to is use the above links as a guide but also go on the sound of the machine/cutting tool makes.

Older machines tend to have more back lash and general play so you usually end up having to go slower than recommended speeds...thats what ive always found anyway!

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

agree with matt, oh and also if you have a lube feed to the tool or not .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Ditto to above.
Id like to say as well though that it is sometimes best to use your ears and eyes to adjust feeds.(Not literally)

I can tear off upto 5mm at a time some times at stupid feeds. Luckily, carbides let me.

Back once again like a renegade master

Edited by Jordan on 19th Mar, 2008.

Back once again like a renegade master