Re: type of mill table slides? (drawer slide CNC tips)

Bill,

AIRC, Dan used "General" brand drawer slides in that machine. From
memory, that was in N&V in '91!

You can make a reliable pcb driller and router using drawer slides
from Accuride, or any of the typical "pre-european bottom mount
powder coated" types from other mfrs.

The important things to remember are:

1) A drawer slide is made to resist forces in ONE direction and
EXPRESSLY designed TO ALLOW force changes in the other TWO. IOW,
these thigs are designed to work in a cabinet opening that mayu not
be exactly the right width.

So from a use-in-CNC standpoint, you have to be aware that if you
mount them "flat" as in dan's design, they can/will move up and down.
And if you mount them vertical--as designed for drawer use--they will
alow th etable to move a bit from side to side unless yo understand
the reasons and design OUT their "ease of mounting for cabinetmakers
feature".

One way to simply do this is to use 3 or 4 slides per axis. with one
set 90° to the others. This way the axis motion is constrained in
BOTH of the unwanted directions; leaving only the desired travel
direction. AND...

The other weakness of these guides in a CNC application is that they
get "weaker" as they extend. (Means a table mounted to one set will
better resist the cuttig forces when the DS's are in their "closed"
position. The additon of the third and/or 4th sldie let yo minimise
this as well. Place the added pair running OPPOSITE the first--when
one pair is "opening" , the related pair is "closing". Hint, you'll
have to mount at least one pair with screw at assembly since you
won't be able to "disassemble" the two DS parts of all 3 or 4 slides.
Try it and you'll see what I mean<G>

Hope this helps,

Ballendo

P.S. There are TWO companies called "General" selling drawer slides;
One is a heavy duty high end mfr; the other is a cheap clone mfr. The
high end "general" slides are sold for pantry and RV slide-outs and
they are likely as expensive as a "Proper" linear bearing unless
purchased used/surplus. They may also bve less accurate than "office"
style DS' though theit ratings will be higher. (Shouldn't be a
problem, a typical Accuride "desk" DS has a rating of 150# and if you
use 4...




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Bill Davis" <wdavis@...>
wrote:

>
>
> ----- Original Message -----
> From: "Steve Stallings" <stevesng@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Sunday, July 30, 2006 12:19 PM
> Subject: [CAD_CAM_EDM_DRO] Re: type of mill table slides?
>
>
> > They look like good quality drawer slides to me.
> Well, ok, but what are they? what brand and who makes them? Maybe

home made,

> from what I can see of them I can't figure out how they're

constructed.

> bill
> >
> > Steve
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "wdavis364" <wdavis@>
> > wrote:
> >>
> >> Under Files section folder PLANS, creator Km64, I see pictures

of a

> >> milling machine with slides that I'm not at all familiar with.

Can

> > some
> >> tell me what is type, name, or discription of these slides? the
> > mill
> >> table is x, y combo with two carrier slides each (4 total).
> >> thanks
> >> bill
> >>
> >
> >
> >
> >
> >
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