Re: Best method for linear motion?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "thunder2kal"
<thunder2kal@...> wrote:

>
> Hello people of best forum of CAD CAM!
> I write from Argentina (sorry for the english)
> I want advice about methods/systems for linear motion for a 2D/3D
> cutting-milling machine for MDF (wood) with the best relation
> cost/benefit.
> The searching is orientated to mechanisms to move in 2/3 axis the
> cutter-milling in table of 2800 x 2000 mm with precision of 0.5 mm
> The motors will be Steps of 200 ppr. (No problem with the
> electronics)
>
> Questions:
> 1) What mechanical technology will be used for each movement?
> 2) What torque to the motors?
>
> Any advice is welcome!
>
> Thank you in advance.
>
> Luli.

The optimum is usually the most expensive.

Linear ball slides are desired due to their smoothness and low friction.

for such a large area, one would benifit from a fully supported rail
system.

the accuracy is easy to achieve in many ways, and my first thought is
t use a poly slide on hardened steel.

the poly slide (Delrin or some such) is better at removing the dust
than a bearing with seals.

For the same reason, I think ACME screws would have a slight edge over
a ball screw.

The good news is that you should be able to get either style to work,
and you can use whichever is easier to get.

Dave