Simple Machine (help and advice needed)

**Gregor** · 16-12-2014

HI
I have been looking at designing the z axis and I have notice that on my gantry design the bottom off the cross section is only 110mm above the base and building the z axis will lower it by another 20mm if I use aluminium plate to attach to the Hiwin linear rails, My goal was to be able to cut up to 75mm hard wood,Do I need to raise that bottom beam up to achieve that ? I have put the measurement's in the sketch
Cheers

**Ross77** · 17-12-2014

The top and bottom mounting does pull the z axis closer but not by much and you still need to get a ball screw in there any way. Horses for courses i suppose, easy build or extra strengh.

With regard to the diagonal bracing I meant the node as is in the connection point of all the beams. As you have shown them at 45 degrees then they start at a node a go to the midspan of a beam.

If you think of it as a wire frame then where ever the main beams meet there is a junction then this is the node.

**Gregor** · 17-12-2014

Hi Ross Thanks for explaining that,I have changed the side rails in the pics what do you think

**Ross77** · 18-12-2014

Yeah that's the badger. I actually meant the diagonals in the bed but that works as well.

**Gregor** · 18-12-2014

Here's my latest attempt at the gantry and z axis, I think if I can manage the budget I may be able to get the 4way loading bearings rails for the gantry but I haven't priced anything yet.the z axis is 230mmx120mm