Workshop made Acetal / DELRIN Rack & Pinion

[davo453]

I have a home made 3 axis wood router (working area 1100mm x 700mm).

It is now basically an extremely competent machine having been upgraded over the months & years.

What I do suffer with is lash (to be expected at speed) on my long (x) axis, this uses Trapezoidal ACME threaded bar (yes I know but it was cheap and has worked up to now).

I'd like to change the x and maybe the y axis to rack and pinion.

I've looked at the commercially available stuff and am not sure that I can easily make the available profiles work with my machine and it is pretty expensive.

Has anyone made their own rack in Acetal? I have machined a fair bit of Acetal on this machine and always had good results.

Any comments or tips?

Dave