RE: [CAD_CAM_EDM_DRO] CNC router build

--- On Wed, 4/1/09, Paul Kelly <tech@...> wrote:


From: Paul Kelly <tech@...>
Subject: RE: [CAD_CAM_EDM_DRO] CNC router build
To: CAD_CAM_EDM_DRO@yahoogroups.com
Date: Wednesday, April 1, 2009, 6:27 PM






I've tried them all. Even built my own with a toolchanger see
http://www.cncathom e.com

I now use a 24000 rpm 800W HF spindle and VFD, something like these:
http://www.kelingin c.net/CNCSpindle andController. html
Mine's water cooled, there's an air cooled variant.
This is the quietest spindle you've ever heard. Cutting soft things
(plastic/wax/ wood) the whine of the stepper motors is louder than the
spindle. Cutting aluminium, you can have a conversation next to it. I have
an enclosure over my router which seems to attenuate the higher frequencies
quite well. I miss my toolchanger, but I won't be going back to it.
These spindles are what everyone who builds a flimsy little router and tells
themselves that "all they want to do is take light cuts in wood/plastic/ Al"
are actually thinking.

Remember, small machines with small cutters take little cuts. Its not
unusual for a job to run for more than 1 hour. None of the cheaper options
(even some of the medium priced ones) are designed for that kind of run
time. 24KRPM means high feed rates, we rough at 4-6m/min in wax and 2m/min
in aluminium using 3mm cutters. These rates slash the time to run a job.

PK

-----Original Message-----
From: CAD_CAM_EDM_ DRO@yahoogroups. com
[mailto:CAD_CAM_EDM_ DRO@yahoogroups. com] On Behalf Of JanRwl@...
Sent: Thursday, 2 April 2009 12:49 AM
To: CAD_CAM_EDM_ DRO@yahoogroups. com
Subject: Re: [CAD_CAM_EDM_ DRO] CNC router build

In a message dated 4/1/2009 7:10:44 A.M. Central Daylight Time,
freshwatermodels@ yahoo.com writes:

I don't want to get into building a spindle so am looking for
alternatives.
I am wondering if there is a die grinder or dremel type tool that has
better bearings and might be quieter than a standard router motor.<<

Jack: Google a firm by name Perske (sp?) (Germany). I haven't bought
from them in over 20 years, but they make DOZENS of kinds of spindle-motors
with
hollow- and collet-shafts, etc. for use in such as X-Y machinery, also the
HF 3-Ø converter motor-generators for powering the HF versions. Sorry I
don't
have contact info, but I just have had no need for their stuff in decades,
so lost contact info.

Now, if you need something "good" but just a little larger than a Dremel,
look at the "laminate-trimmer routers" in construction vendor stores such as

Home Depot, Lowe's, etc. Sadly, the Japanese makes are FAR nicer machinery
and
more reliable than the usual U.S.-made "competition" . But may-well be a
bit
pricier for "same" item.

If the usual NOISE of a "universal motor" (the kind with "brushes" as in
routers) is too much, think on using a HF (High Frequency) 3-phase motor;
running on 400 Hz. Gets very expensive, as you have to have either a
motor-generator to produce the 400 Hz. 3-Ø power for such a spindle-motor,
or, some kind
of electronic source such as a VFD. If initial cost is not a factor, go
with
the HF 3-Ø. It'll last longer and drive fewer operators nuts, with loss of

hearing and tinitus! (NO LOL!) Jan Rowland

************ **Feeling the pinch at the grocery store? Make dinner for $10
or
less. (http://food. aol.com/frugal- feasts?ncid= emlcntusfood0000 0001)

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