7' X 4' Combi

[JAZZCNC]

Having Lowered the gantry already i didnt want to lose any more Z travel so ive opted for this configuration of bearings..




540x300x30mm Ali Plate, Should Give an Assembled measurement of less than 95mm from gantry to front of plate..

Rick

Don't like the fact the Z axis bearings are so far up the back plate, your creating probably 70mm more leverage. Reducing this flexy leverage is more important than having a slim Z axis any day.
The 300mm for Z axis front plate is a bit of waste has well and will make more work for the stepper and reduce feeds/accel at 30mm thick. 200mm width is fine so thats effectively 540x100x30mm and £23 of wasted plate and if 6 series ali 4.3KG of weight thats not required.!!

If you must have narrow Z axis then I'd go with some thing like the pics below.
It's wider on the Y axis by 60-70mm were bearings are located but slimmer on the rest and Z axis front plate but more importantly the bearings are lower down.
Also it's actually slimmer at approx 70mm from gantry, will be much lighter and estimate approx 10-12KG lighter over all and will probably use less material depending if you can use the same shortened back plate.?

Obviously I've had to guess and used 20mm linear bearing models and dimensions here so depending what your actually using things could workout slightly different.