Re: [CAD_CAM_EDM_DRO] Cutting speeds

Thanks everyone for your good advice.
I do, eventually, want to machine some titanium but, in this case, I was
just really using it as an example of a material that most people probably
didn't know very well. As a newbie to cnc I am really trying to get a feel
for how people approach programming the machine to work on unfamiliar
materials or with an unusual cutter. It seems quite hard to believe that you
could make a complete guess at cut depth and feedrate which would give safe
cutting at a 'commercially' high speed on the first attempt but people doing
prototype work etc. must have some 'rules of thumb' which would be of help
to people who, like me, are taking their first steps in cnc.
Perhaps it would be useful for this type of information to be put together
as a page for the FAQ as I'm sure I'm not the only newcomer who has puzzled
over this.

Ian
--
Ian W. Wright
Sheffield UK
www.iw63.freeserve.co.uk

----- Original Message -----
From: "Jon Elson" <jmelson@...>
> First, there is an optimum cutting surface speed for combinations of
> workpiece and tool materials. Generally, the harder stuff needs to
> be cut at lower speeds. There are tables in all sorts of documents, from
> the 1940's Atlas lathe book, to machinery's handbook, to tables published
> by cutting tool manufacturers.
>
> Once you have a surface speed for the material/tool combo, you can
calculate
> spindle RPM. For turning, it would be the diameter of the workpiece that