Re: [CAD_CAM_EDM_DRO] Cutting speeds

In a message dated 11/26/2000 2:43:54 PM Hawaiian Standard Time,
Ian@... writes:

> Hi,
>
> I know this will sound like a really purile question and I'm really aiming
> it at those who do small work on desktop machines but here goes...
>
> How do you decide on an appropriate feedrate for materials and cutters you
> haven't used before?
>
> Wise words from the knowing would be greatly appreciated.
>
> Ian
> --
> Ian W. Wright
> Sheffield UK
> www.iw63.freeserve.co.uk
>
>
>

Ian,

I often talk to commercial shops about this very subject. Many have a two
tool rule. You burn or snap the first tool, you make the second finish the
job.

I often will use specs commonly used on a "similar" material. You will soon
learn your machine just like a manual machine. For example, there is no way a
R-8 spindle will take an aggressive cut with a 2" end mill in stainless as an
extreme. If cutting titanium, you can suspicion it will be tougher than 316
stainless. Whether it is as sticky as monel etc will help determine your
selection of cutting fluid. You will find it acts as hard as chilled cast
iron, looks like you are cutting aluminum, creates heat as though cutting
stainless and it is sticky like monel!

Nothin but trying in a lot of cases will get you over the hump. Many times
it is spindle limitations rather than cutter. Not rigid enough to keep
carbide from failing etc. imho

Peter
THRD, Inc.
Ex- shipyard machinist


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