Re: help on tapping

On Fri, 04 Nov 2005 14:04:02 +0100, francis POPU
<francispaspub.popu@xxxxxxxxxx> wrote:

>But i have a probleme when i use the link to simulate. The result is not
>what i see on my CNC.
>When CNC is tapping with M8 (3000 tr/min) tap it use near 130% of
>spindle power. I have 7.5 KW spindle motor. So where is the probleme ?
>
>On the same machine i have a system that control tool break with a
>current captor. I have try diffrent speed :
>1500 rpm = 30 % spindle power
>2500 rpm = 90 % spindle power
>3000 rpm = 130 % spindle power
>
>Do you think it is normal to use 130 % of spindle power ? is it good for
>spindle and motor ?

What is the torque curve as seen at the spindle?
Max *actual* HP is at the max *product* of RPM
& torque.
Your meter may only be reading amps .... and
then there's te duty cycle of the spindle drive. As
long as that's not exceeded you should be fine ....
and if it is the motor-controller breaker should
blow first (on a good machine).
--
Cliff
.

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