Re: [CAD_CAM_EDM_DRO] Re: Long Acme threaded rod

Hey Steve - I've cut 80/20 with my chop saw - was scary at first but it
cuts just fine - at first I clamped it into place and cut while cringing
LOL but by the time I was done I was holding it with my hand like any piece
of wood - one time I tried to go too fast and the blade seized up - but not
unlike it would on some hard wood or something

Jamie
Check out my CNC projects (and more) at http://www.backyardworkshop.com

On Mon, Jun 17, 2013 at 3:10 PM, AlienRelics <alienrelics@...> wrote:

> **
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Tony Smith" <ajsmith1968@...>
> wrote:
> >
> > > I'm working on designing and building a CNC mill/engraver. I'd like it
> to
> > have
> > > a cut volume of approximately 1000x1500x100mm (about 3ft by 5ft by 4
> > > inches) that can cut aluminum plate and hardwood, at most. I expect to
> > take
> > > multiple passes to cut through an aluminum plate.
> >
> >
> > Belt drive works fine. Have a look at
> > http://www.automatedwoodworks.com/Videos.htm, about 1:10 into the first
> > video might interest you. It's a shame he doesn't mention how long those
> > pieces took.
> >
> > www.mechmate.com is worth a look, might be a bit much though.
> >
> > Ignore hanero and his usual BS about machines being rubbish unless being
> > built of unobtanium & capable of sub-micron accuracy. (Google his posts,
> he
> > has some rather, ahh... amusing gaps in his knowledge.)
> >
> > Tony
>
> Thanks! I think I'll revisit the idea of using timing belts. I don't need
> sub-micron accuracy, after all. The ShapeOko has a static belt with rollers
> wrapping it around the motor pulley, but teeth up. I'd mount it teeth down
> and on the outside to avoid having a lot of debris settling on the belt.
>
> I see some people saying that the cut volume I gave is too small to be
> useful. I am going to guess that those were meant to be funny? I figure,
> large enough to engrave a door, although not the entire thing at one time.
> Large enough for what I want to mill. I'd love to have one that I can load
> a 4x8 sheet of anything into, but don't have the money for it. And I wasn't
> planning on making furniture with this.
>
> I will be comparing the cost of linear bearings with steel rails vs 8020
> and V roller bearings. 8020.net has a bit of software that will give
> deflection vs weight for all their sizes of extrusion, and it takes
> unloaded deflection into account.
>
> So I've only cut relatively thin aluminum with a carbide blade in my table
> saw. Has anyone here had any experience using a table saw or chop saw to
> cut 8020 aluminum extrusion?
>
> Steve Greenfield AE7HD
>
>
>


[Non-text portions of this message have been removed]