Re: Opinions on $250 cnc machine

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dhiren Shah" <dshah@s...> wrote:

>
> Would this kind of design have an anti-backlash nut or do you need

backlash

> compensation in the software?
>
> We will be very interested in such a design if it is solid and accurate.
>
> What type of step motors and current do you provide for your operation
> everyday?
>
> Dhiren Shah, Dir., Operations
> Solustan, Inc., 165 Chestnut St., #200, Needham, MA 02492
> PH:781-449-7666, FAX: 781-449-7759
> www.Solustan.com
> www.LinkMotion.com
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com]On Behalf Of kz1927
> Sent: Wednesday, November 02, 2005 9:11 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Opinions on $250 cnc machine
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "agerooo12000"
> <agerooo12000@y...> wrote:
> >
> >
> >
> > > It's the standard table moves x-y design but
> > > It's made of 1.5" industrial polyurethane.
> > >
> > > Every bit as solid as aluminum but the design is
> > > reproducable.
> > >
> > > In three years of playing with cnc designs I hardly
> > > ever see this material used but it has serious
> > > advantages to it. There's a section on polyurethanes
> > > in McMaster-Carr that tells about the material.
> > >
> > > My design is also modular meaning one could simply
> > > change the length of the drill rod I use to make the cutting
> > > area larger, though I do think up to approx. 20" is about
> > > the max for this particular design.
> > >
> > > Thanks Again -John
> > >
> >
> > What makes your plastic machine different from other plastic machines?
> >
> > What diameter drill rod do you use?
> >
> > Do you support it just on the ends or in the middle also?
> >
> > What sort of fit do the linear ways have and do you see problems with
> > temperature changes?
> >
> > How large of an endmill/cut can this machine handle?
> >
> > Drill rod is unhardeed tool steel and is prone to flexing, do you see
> > flex in your system? Chatter?
> >
> > How long has your machine been running and what does it cut? Do you
> > have a video of it in motion?
> >
> > I'm interested, but I have many doubts about the use of plastic for a
> > metal cutting machine
> >
> > Bill
> >
>
> Thank you all!
>
> Great questions!
> This design used 1/2" drill rod and 1/4-20 threaded rod.
> Oilite bushings. Supported on ends. That's why it's a small
> machine. Prototype uses a dremel tool to cut wood & plastics
> I'm making tooling right now to use 3/4 rod with 3/8 threaded
> rod. I fully expect to run a laminate trimmer on one soon.
>
> The nuts are polyethylene or brass. Been using one all day long
> for several months.
>
> It's mostly intended for PCB's, engraving, & fine detailed
> stuff. Not for machining steel.
>
> I do understand about the "plastic" doubts, but this stuff
> is different from "plastic"(though it IS plastic).
>
> You can fix it if you drill a hole in the wrong place.
>
> It's VERY solid for small things.
>
> I'm not a salesman but I am convinced an affordable,DEPENDABLE,
> machine can be made.
>
> How do I send a picture?
>
> Thank You -John
>
>
>
>
>
>
>
>
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I've
been using easily replacable "snap-in" polyethylene nuts -no backlash
on the only one I've had to use...It's just a 1" cube drilled &
tapped.

Before I get in any trouble let me say that I'm here to share
and get experienced opinions on something I'm positive will
benefit all. I haven't seen this stuff used and it should be.

I built a disc finisher (polishing machine) 10 years ago out of it
and have used it 15 hrs a week every since.

My first lathe was cast on the end of an old blower motor.
I made actual usable roller bearings out of the stuff.

I,d like to make a sortof "snap-together" customizable
cnc kit and I have.

I do want my idea critiqued, critisized, and taken apart
because the thing HAS to work.

Thanks -John