1200 x 800 Gantry Router Build

[reotilemarine]

After thinking about my options and speaking to JAZZCNC I am changing my plans in terms of build method. I would like to keep the same overall bed size however I am now working towards designing the router using 45x90 extrusions and end plates. The reason for this is that it will be more than strong enough for the work I am proposing to do and reduces the complexity of welding and epoxy y - axis levelling.

I am working on a CAD design at the moment however having never used fusion 360 before it will be a steep learning curve however I feel it is necessary to get all dimensions and sizes of components correct.

So for now I will have to describe my intentions and go from there.

I am planning on using 45x90 extrusions. One down each side of the bed forming the supports for the 20mm linear rail recessed into the end plates.

I shall also include an extrusion down the centre of the bed to provide additional support for the end plates.

End plates and gantry side frames will be 20mm tool plate aluminium.

Gantry will be made up of 2 x 45x90 extrusions in an L configuration recessed into the gantry sides.

I am thinking of twin 1610 ball screws for the y axis, and single 1610 for the x and z.

20mm linear rails throughout.

One thing I am not sure of is whether it would be better to have twin motors for the y axis to aid in homing calibration or wether to utilise a serpentine belt on the two ball screws and rely on them moving the gantry in tandem once calibrated.

Drive motors I am hoping to use closed loop stepper motors so advice on the options regarding power would be great. I can then make a start on the CAD model and put these parts in as a starter for 10.

In terms of linear rail carriages. What is the difference between the standard size versions and the wide / thinner versions?

Image showing the style of machine I am proposing.