pressure vs. feed B/Saw pwr dnfeed was Re: I need a latching relay...or do I?

Dave,List,

This pressure vs. feed thing has me wondering... And not just about
bandsaws. What IS the BEST approach to cutting material? It seems
that controlling pressure would allow the cutter to work at its' BEST
rate, and accomodate material/cutter variations. Whilst controlling
feed would assure a certain chipload, but would not deal with
material/cutting edge variables very well?

If we have a cut-off style bandsaw, and we provide it with a power
downfeed, which IS better; hydraulic or motor?
Seems there are reasons for each one being superior to the other.

Also, should our CNC machines have "adaptive" feedrates? (now it's on
topic<g>) Tie the servo feedrate to the spindle amps or some similar
idea...

Is anyone aware of any tooling research on this? (I hope BOTH topics
in this question get a response)

Ballendo

--- In CAD_CAM_EDM_DRO@y..., dave engvall <dengvall@e...> wrote:
> Doug,
>
> Consistent feed rate should come from a motor not
> a hyraulic cylinder which would give consistent
> pressure or force. Not quite the same thing.
> Maybe a dc motor with speed control driving a
> screw or ball-screw.
> Naturally, once you get hydraulics set for a
> given cut it should be OK.
>
> Sorry that I think different or am so picky. Just
> the way it is.
>
> Dave