Re: CNC Router Head/Motor???

Neat idea Carl, it does solve part of the problem. your unit is one
I would like to see on a video clip.

The poster listed this type of work as the sort.
http://www.corpcomp.com/weeks1/mb/mb.html

I think it may be foam. which would change everything if it was
cutting foam.

He mentioned a mortise cutting press. but as I understand that has a
hard and rigid housing around the cutter itself.

if foam were the material being cut, pretty much any type of shape
cutter could be used and certainly a 3/4 hollow shaft and 1" bit are
not out of the question. since the strength is much higher as one
increases diameter, a much larger dia will go far to reduce problems.

point cutting is also much lighter work than side cutting, especially
on long cutters. probably why the video clip shows a carbide ball
mill.

As a final note, the milling of a foam or balsa wood model would be
easy with a light duty rotating axis. it the part was on a
rotisserie of a sort, the cutter length would not be an issue and
neither would cutting forces. Heck, depending on the size of the
table clearance, one could do a complete plane.

Dave





--- In CAD_CAM_EDM_DRO@yahoogroups.com, Carl Mikkelsen <cmm@a...>
wrote:

> For my current Stewart Platform mill/routing machine, I'm using the

Porter

> Cable ~1/2 HP laminate trimmer. It works well with 1/4" diameter
> bits. The next machine uses the 3.25 HP variable speed router,

which

> accepts a 1/2" diameter bit. Getting 6" of z-axis movement isn't a

problem,

> and the tool can be tipped (roll and pitch) to get into some

difficult places.

>
> How large are the pieces?
>
> -- Carl
> cmm@a...
> http://www.foxkid.net/cmm/platform/project-notebook.html
>
>
> 04:06 PM 2/24/2003 -0600, you wrote:
> >I must not have explained myself very well as usual. I'm not

looking to

> >cut 6" with a .25 diameter tool. I'm looking to cut 6" with ???

tool? I am

> >asking what type of machine head can I buy that will allow me to

cut at

> >depths of 6~8" like see at this site
> >http://www.corpcomp.com/weeks1/mb/mb.html Looks like I will need

some type

> >of mill had or something with a morse taper or r8 Spindle that

will allow me

> >to chuck a bigger bit. I've almost thought of using this:
> >http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?

itemnumber=37505 and

> >stripping it down but it doesn't have a spindle that I can work

with, I

> >think.
> >
> >Thanks
> >
> >
> >----- Original Message -----
> >From: <Yesamazza@a...>
> >To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> >Sent: Monday, February 24, 2003 2:45 PM
> >Subject: [CAD_CAM_EDM_DRO] CNC Router Head/Motor???
> >
> >
> > > I would recommend using a 1" dia through hole spindle

and using a

> > > precision 1" dia collet extension. This will allow you to

adjust the

> > > extention up and down for min clearance and maximum rigidity.

Data flute

> > > makes carbide endmills with short flute lengths and long

relieved shanks

> >$$$
> > > but work about the best form my experience. The outside dia.

of the

> > > extension is a fine ground finish suitable for sleeving to a

bearing and

> >most
> > > extensions are hollow so you can adjust the tool in and out too.
> >Extensions
> > > are used a lot in the Aerospace industry due to limited space a

deep

> >reaches
> > > in castings ect. I have never cut 6" with a .250 dia tool and

would

> > > recommend avoiding that kind of tool length if at all possible

I have cut

> > > alum with a 3.0"x .25 dia tool over 6" with a 1" dia extension

and it

> >worked.
> > > Thats my 2 cents hope it is of some help.