OK. I assume that is uses just a single screw. I really like how the red screw holding section is cleverly keyed to prevent it from migrating as it is tightened and its wedge shape keeps the line of the screw vertical. The slope of the grey clamp keeps it out of the way of a moving endmill bit too.
I was just considering the mechanical forces being applied as a sideways load from bits sized from 6.35 to 9.53mm in diameter. (my new trim router will accept these sized bits) My newly ordered CNC machine comes with a 710W trim router. Power will be around 0.952 kW at an angular speed of 30,000 rpm. Taking 0.952kW @ 30,000 rpm = 0.3Nm and at 10,000rpm it will be equal to around .90Nm.
I found the clamps that originally came with the SM1 to be soft and somewhat flimsy. The clamp design was not the most user friendly and it intruded a fair amount into SM1’s very restricted CNC workspace (90mm square).
I also found holding the original SM1 clamps and trying to tighten/adjust two set screws was quite awkward. My own modified clamp design has simplified the clamping process without intruding more than 5mm into the workpiece surface area. Additionally, the clamps are made from T6 aluminium which is non distorting, they don’t mark the workpiece and the line of force through the clamp and the additional spacers makes reasonable engineering sense to me.