Re: [CAD_CAM_EDM_DRO] Use Router for metal work

Niyom Racharin wrote:

>
> Hello All,
> I am new commer in this field, now I build my own xyz cnc table which
> its working area is 600 x 1200 x 150 mm
> and I mount Makita router N3701 and use it to work on wood and PCB.
> Here is my silly question :=
> If I change the small router to the bigger model such as RF1101kit,
> Will it be able to work on a metal such as
> steel , aluminium or copper ? in slow feed rate.

In general, using routers you want to lower the spindle rpm and
increase the feedrate, to actually cut sizable metal/wood pieces and
get away from just 'rubbing' the cutter. Going to a bigger (more
horsepower) spindle is then a good idea (but you may still want
to reduce the rpm using an electronic variable control). As always,
try to go for a decent feedrate (wood about 150 ipm minimum,
250-325 is very good, 400 ipm max), and spindle rpm around 18,000
for a 1/4" dia bit, decreasing to 8-12K rpm for a 1/2" bit.

Your positioning motors have to have a decent amount of power
for this. If you can't go that fast, you can go slower, the only
downside is a faster wearing tool and maybe more smoke in the shop.

Regarding metal work, the same principle applies, you don't want
to be using a 27,000 rpm bit unless it is 1/8" dia or smaller.

Again, the bigger router running at lower rpm (with an auxilary
speed control) and faster feed rates is the optimal answer.
Extended to its limit, you end up at a Bridgeport with a 5HP
spindle, fairly low rpms, and a slow feed (due to the slow rpms).
Remember, you want to make chips, not aluminum vapour due to
rubbing caused by inadequate feed or a too-high rpm).


Doug Fortune
http://www.cncKITS.com