Re: Mill recommendations needed for new CNC Project

--- In CAD_CAM_EDM_DRO@yahoogroups.com, <andrey@...> wrote:

>
> Hi Fred,
> How much horsepower are we talking about for a 1/8" carbide cutter?

For industrial use, I wouldn't specify a machine to cut tool steel
with anything less than one HP. The OP, Tom M, said that he was
planning to use a 1/8 carbide cutter, but if he is using a ball mill,
the HP could be even higher than what might be calculated for a
square corner mill. In either case, the significant horsepower
requirement will be to spin the tool and spindle at 5000-7000 rpm

The trim routers are all rated at about 1 hp, The useful Mill drills
and most Bridgeports at 1-3. In these ratings, some motors are not
very efficient and may lose 50% of the input. ( Check the duty
cycle, if they have cooling fans and fins, and how warm they get)

Recap:

1hp

-50% for efficiency = .5 hp available

-30% for Spiindle losses at 6000rpm = .35 hp available for cutting

-probable max cutting hp requirement .25 ( by interpolating log
scales on the lower end of feed speed calculators) = .1 hp margin
(40%) for dull tools and hard spots in the material.

Fred Smith - IMService
http://www.cadcamcadcam.com