Re: stepper & driver

Have you ever considered creating two separate x-axis assemblies and
slaving them together using your CNC controller software? You'll
have to go through the trouble of making the two complete axis
assemblies but you won't have to worry about the gantry getting out
of alignment. Also it allows you to run two midsize motors instead
of one big one to push the gantry along.

As far was the oak, sealing it with epoxy might be overkill, you
might want to use oil based urethane for floors. It builds well, and
it's spray able (even through a garden sprayer) that way you'll be
sure to get all the nooks and crannies.

Tie that with some brass accents and it will look great :)

Just an idea.

Aaron Moss
www.IndustrialHobbies.com



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Douglas Pollard"
<dougpol1@o...> wrote:

> Hi cnc folks,
> My thinking on using oak to build a cnc router is that I

already have the wood "free". with it screwed and glued together it
will be light. Several coats of epoxy will solve most of the
expansion problems where moisture is concerned. I plan to use metal
ways for accuracy and ease of movement. The x axis rails will be
tied together with metal bars so the expansion of the wood will not
change the y axis width. Only one rail will be bolted tight to the
wood the second will offer support only but will not act as a guide.

> I have 50 ft of roller chain it is about the size of bicycle

chain # 10 I would guess. I am thinking that I will put one piece on
each side of the gantry to drive in the x axis. Each side will be
driven by a # 33 frame motor {I think this is the right designation?}
It's close anyway. I understand that. I that I can hook them up in
series.

> I would consider 30 to 50 inches a min. feed rate with 100

inches rapid traverse a complete success anything faster would be a
bonus.

> The Y and x axis would probably be driven by lead screw. I

see no reason that a second motor on the y lead screw could not be
added if needed also hooked up in series.

> Any comments on the practicality of hooking motors in

series would be a big help. Do you get double the power? Do they
interfere with each other? Does this overload the drivers in some
way. I assume power supplies have to be larger?

> I have seen reference to this practice on line but no real

detail as to, how.

> Doug
>
>
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