Re: Thumb Calibration

Thanks Fred. The cutter was .5", 4 flute HSS.


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Fred Smith" <imserv@v...>
wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "reed_irion"
> <Reed_Irion@h...> wrote:
> > I am trying to get an idea of rules of thumb for speed and feeds
> > that work.
>
> Reed, this is not necessarily a rule of thumb, but is related
> directly to cutter size and material type. Since you did not

mention

> cutter diameter in your post, my first inclination would be that

you

> don't realize that cutter diameter is important to determining
> rotational speed. Figure about 80-100 surface speed for cutting

soft

> steel with HSS tools and be prepared to douse it with a little
> coolant from time to time.
>
> Hot rolled steel is notorious for things like sand inclusions and
> even an occasional ball bearing showing up. Also the scale is

very

> abrasive when cutting with HSS. I would suggest you either remove
> the black scale from the surface with a carbide face mill or plan

to

> use a carbide cutter.
>
>
> Fred Smith - IMService
> http://www.cadcamcadcam.com