Click image for larger version.  Name: y gantry.jpg  Views: 2096  Size: 71.0 KB  ID: 8060Click image for larger version.  Name: y gantry.jpg  Views: 2127  Size: 75.6 KB  ID: 8059Click image for larger version.  Name: profile y gantry.jpg  Views: 3751  Size: 79.5 KB  ID: 8058

this is what i had in mind for the gantry y axis after do some basic calcs and using the spread sheet on here

the deflection for y and z had a tolerance of 0.054, this being 2 x 4 " ali u channel and 1 6 " channel with y axis = to 1500mm but this may get reduced to 1350mm this may be wrong

my calcs may be wrong as i may have use the ss in the wrong way

please put me right

ric