gantry_sizey = 100; gantry_top = 180; gantry_bottom = -table_thick - table_height/2; gantry_gap = 24; gantry_thick = 12; gantry_posl = 0 - gantry_gap; gantry_posr = table_sizex + gantry_gap; gantry_sizex = table_sizex + 2*gantry_gap; gantry_clear = 80; gantry_rail_size = 8; gantry_rail_posy = gantry_sizey - gantry_thick - 2*gantry_rail_size; gantry_rail_posz1 = gantry_clear + 10; gantry_rail_posz2 = gantry_top - 10;