Backward stabilization of a Z-axis (with image)

[Max551]

Hi,

I'm trying to build a vertical lifting axis. Overall weight would be around 20-30kg that's needed to be lift.
Now I'm struggling at a certain point of decision. I have 2 HGR20 steel linear rails with a length of 1200mm. Those I want to attached with M5 screews to a 12mm aluminum 5083 plate. Each 60mm the rail is attached with a screw. On the back of that plate I considered two pieces for stabilization which I would mount with M4x20 countersunk head screws every 60mm or 120mm. I have now two options:
1) placing the stabilization right behind the rail
2) or on the edge of the plate.

my thoughts:
2) is easier to aligne
1) maybe more robust? but it may make the plate/underground more uneaven and so the linear rail?

What would you suggest me? I'm having hard times to decide what's best?
Thanks a lot, Max

 

[3DDave]

Don't the screws for the rail come from beneath? If the screws for the support come from the top you won't be able to access the one installed second if the rails align with the stabilizing plates.

 

[Max551]

Hi Dave,
no the 12mm plate will have threads and the rails just have holes. So I would first mount the support and after that the rails

 

[buildinggalileo]

Interesting project!

 

[3DDave]

They have counterbored holes, which is a significant attribute.

Neither will be "easier to align" as the M4 countersunk screws need to be precisely placed to match threaded holes in the stabilizing plate.

 

[Max551]

Maybe I should have mentioned that I will do the drilling with my cnc machine. So placing would be fine.
I linked here a detail of the rail. For the rail I would use cylinderhead hex screws