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Warn users that spindle is too fast in G33 / G95 #167

Description

@robEllenberg

Here are the steps I follow to reproduce the issue:

  1. Have a machine with a slow K axis (ex. max velocity = 60ipm)
  2. Run the following G code snippet
M3 S1000
G0 X0 Z1
G33 Z0 K0.1
M5
M2

This is what I expected to happen:

Some form of warning that the machine can't reach the required feed rate. To execute that motion properly, the Z axis needs to move at 1000 rpm * 0.1 in / rev = 100 ipm (greater than my example limit of 60 ipm).

This is what happened instead:

The cut proceeds without complaint, and cuts the wrong thread pitch.

It worked properly before this:

Probably never, but this seems to have been an issue with 2.6.x as well.

Information about my hardware and software:

Use a simulation config with a slow Z axis (the stock axis simulator will work).

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