Re: want inexpensive 4 Axis CNC controller - plans? suggestions?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "lomcevaktumble"
<lomcevaktumble@y...> wrote:

>
> Hello everybody. I was planning on buying a 4 axis cnc controller for
> a foam cutter from HobbyCNC...but now they're out of stock until
> further notice. The price range of $80 - $90 is where I'd like to stay.
>
> Well, I'd like to find out if there are alternatives out there.
>
> For example, I wouldn't mind building my own controller - but I can't
> seem to find any compelling plans out there. Does anyone know of plans
> that have inexpensive or decent controllers?
>
> Why is it so hard to find this kind of stuff???
>

For a couple reasons. #1 the single chip stuff is from the
manufacturer so no one else is gonna just post copies of the data
sheet. ie: allegro A3977 it's all there.

second, is that the non-single chip methods are much harder and
therefore somewhat secretitive.


My suggestion is to build everything else first, the machine, the
power supply all of it and then see if you can get that controller.

If you want a simple controller get the kits-r-us units, about $16
each or so. They are single step but will do the job of moving things.

And, that would at least prove out the machine.

As for single step, if you use 20 TPI screws and those 200 SPR motors
that is 4,000 steps per inch in full step. not too bad.

Dave