Stell frame cnc 1500X1000. Adjustable table your opinion please

[Boyan Silyavski]

I bought M25 or so bolts for the machine, soldered the nuts to the legs, thinking that will hold. When the machine was ready i left it on the nuts only and they lay on the hockey pucks. cause i did not find M25 bolts sturdy enough. On your machine M25 6cm bolt on the legs will shake like a plastic, once that heavy gantry starts accelerating.

The pucks are made from hard PU rubber. make sure they are the solid ones, not refilled with something.


You call 1cm imperfection , i have to deal with 6-7 cm inclination in my garage and i plan to level it with cement. Thats what is best to do, to level the floor under the machine. If i had to deal with 1cm, i would simply stick 10mm steel plate below the leg.


Translate for you design:
I meant these pieces in blue Not to be welded until the gantry is ready and mounted and rectified in all directions:



Then bolt these 2 together with a piece of paper between them/that for the later paint thickness



Then bolt all that is in blue together as it would be at the end, trying all bolts to be in the center of the holes. the bolts must not be tightened very much



Now move to one end the gantry and spot weld with 5- 6 spots 1 of the pieces in blue from the first picture. Rotate by hand the screw and move to other end of machine. Now you spot weld the other fixture.

then dismount all in blue, ballscrews , etc. Then weld well the 2 fixtures. No everything is in parallel/guide rails and ball screws/ and perpendicular/ball screw supports.

When painted and ready, mount them the same way. So the only necessary adjustment will me made by the play of the bolts that hold the ball screw end supports to the fixtures. Tighten them when gantry is at that end.

In other words, now all 2 rails and 2 ballscrews are exactly parallel and have exactly same travel. Doesn't matter if one is up or down, otherwise using other method that also should be taken care of.