Router build

[JAZZCNC]

sand with a 1500kgm3 will add 60kgs to the gantry :S

an idea ....

How do you work that out.? What size boxsection are you using and how long.?
Looking at your pictures of design the box section looks like approx 120 x 80 and not much more than 1mtr long (and your proportions are wrong 120x80 won't have square internal rad they will be approx 5mm.)

So according to solid Works, I've just took the volume of the internal of 120 x 80 x 5 x 1mtr length rectangle section and working on 1470kgM3 which is the closest material I could find in Density which happens to be Melamine resin. The density comes out at 11.29kg per 1mtr length. That's just the internal volume not the Steel.

The same volume with Unfilled Epoxy comes out at 8.45Kg but that's without any filling which you would need. SO I reckon Epoxy/sand or gravel mix would end up weighing much more.!