Woodworking Router SBD0905

[scratchbuilt_designs]

My design goal was to have a gantry with a very high stiffness. Therefore, I made the gantry beam out of a box structure, which has a high torsional rigidity.

The main part of it is the plate to which the linear rails are bolted to. This is illustrated as blue in the renderings. This is one 25mm thick piece and the 25mm thick side plates are bolted to it from two sides.
The huge cut-out is used for other parts in the build...

In addition this plate is reinforced with two 25x40mm aluminum strips into which the alignment edges for the rails are milled.

The backsides of the two side plates are connected with a 10mm thick plate, which forms the box. Two 25mm thick intermediate ribs, evenly spaced reinforce the whole box structure.
Two thin profiles, top and bottom, close the box and protect the servo from dust.

The servo is fixed to one side plate and the whole spacer unit with the bearings and the intermediate shaft can be adjusted with four grub screws from the front, in order to tighten the timing belt before fixing the servo.
I went for this rather unusual design, because I did not want to have a cut-out for the servo in the side plate, which would have been necessary, if the pulley was mounted directly to the servo...