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Diagram Looks Wrong

Diagram Looks Wrong

Diagram Looks Wrong

The third post has a diagram of a side view of a gantry for a CNC Router and the forces upon it.


Question is, the force arrows look wrong to me. Shouldn't the pivot point be point A in both directions of the exerted force on the cutter (point C) along the x axis, not B? In which case fa and fb should be reversed?

RE: Diagram Looks Wrong

I'm not a member of that forum so the image is very small/pixelated/difficult to read. You may want to ask for permission and re-post it here.

Much depends on the signs of those force vectors. The directions of the arrows are unimportant as long as the signs are corrected so that they equalize.

RE: Diagram Looks Wrong

There's nothing wrong with the direction of the arrows, as long as the signs are correct.

The way they are currently drawn, if Fc is negative than Fa and Fb are positive.

Orienting forces this way can be advantageous, depending on what you're trying to accomplish.

RE: Diagram Looks Wrong

Thanks, hmm time to ponder.

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