Re: [CAD_CAM_EDM_DRO] Re: Servo motor selection

ym_wong@... wrote:

> --- In CAD_CAM_EDM_DRO@y..., mariss92705@y... wrote:
> > (2) Going the other way. Say you need to move at 720 IPM and have
> > a "push" of 550 lbs.
>
> This bring up a question of how do I know how much "push" I need for
> a particular job?
>
> Say I want to cut 6061 aluminum, 1/4" cut with a 1/4" wide cutter, is
> there a table/formula that one can lookup for different material and
> a function of material removable rate?

There are tables to compute HP required to remove X amount of metal
per unit time. For common Aluminum alloys, it is about 3 cu In per minute
per HP. Given that, you can figure out what sort of cuts you can take
with a particular size end mill to remove that much material per minute.
Given the cutter diameter and RPM, you can figure what force at
the tip of the cutter will load the motor to the HP capacity of your machine

(this force will be a worst-case number for the force required on the
table to resist it.) Add a little safety factor and you have the number for

your 'push'. I used 1000 Lbs for my bridgeport machine, it seems to be
a good number.

Jon