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Pythagoras will give you the distance between the start point and the end point. So if D is the distance between the start and end points up 3mm and across 20mm then D?=3?+20?? ? D?=9+400=409? ? so D is the square root of 409 which is 20.22mm and is not an angle. It is not what you asked for.

Are you using a probe to check stock angle? For example descend until the probe makes contact, set z axis to zero, rise something like 20mm, move across 20mm then descend until the probe touches, note reading on z axis. If so then ATAN is what you should use. The problem is MACH3 does not make it easy to then do something based on the result, there is no IF option in MACH3 but you can do it in a macro so you could have something that puts out the message "The angle is" or lets you know if the part is simply too steep or too shallow. So if you are writing a macro then that should make what you want to do possible.

Example macro, note I have not checked but I think 802 is the correct value for the Z axis. What you do in the macro after calculating the angle depends on what you propose to do with the information. I also have not checked what I have written it is just based on things I have done in the past for probing.

Angle = -89
Hfeed = 20
Feed1 = 30
Feed2 = 200
NegMove = -50
Posmove = 20