Gustave Build : Woodworking router

[NordicCnc]

-for a serious Z axis you would like to move the rails not the bearing carriages, furthermore overhang should be as minimal as possible and that a key in for a perfect finish on metal.

I would like to challenge this claim a little bit: The spindle motor is as stiff as its axis, bearings and housing. Take the allowed clamping area of the spindle motor, which is usually 150mm. Add the tool length and tool holder length to that, and you will have a 200mm gantry clearance, if the spindle is clamped in the spindle bracket at its highest allowed point. This means that you can have a short front plate, only as long and wide as you want to space the carriages. What becomes critical here is how you design the upper part of the rear plate. This design needs to be stiff when machining with the Z-axis raised up high.

In the end, rails on the front plate will be stiffer and will allow a greater gantry clearance. But if 200mm gantry clearance is enough for you, then I think the design I have described is better.


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