I have been thinking a little bit more on this. It occurred to me that you may be better just reading the Z axis DRO into two variables and using the difference between those two values to calculate the angle. That way you would not loose your Z axis setting. Like this:
Angle = -89
Hfeed = 20
Feed1 = 30
Feed2 = 200
NegMove = -50
Posmove = 20
Zdro1 = 0??
Zdro2 = 0
Zdifference = 50
Code "G91 G31 F" & Feed1 & " Z" & NegMove
??While IsMoving()
??Wend
Zdro1 = GetOEMDRO(802)
Code "G91 G31 F" & Feed2 & " Z" & PosMove
Code "G91 G31 F" & Feed2 & " X" & PosMove
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Code "G91 G31 F" & Feed1 & " Z" & NegMove
??While IsMoving()
??Wend
Zdro2 = GetOEMDRO(802)
Zdifference = Zdro2-Zdro1
Angle = ATAN(Zdifference/20)
Note, if you get a negative value for the angle when you want it to be positive then use Zdifference = Zdro1-Zdro2
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