Ian. I can't see how the polarity of the axes would affect the particular problem I'm having, but thanks for the suggestion.
Bob/Clive
I've gone through the videos and tried operating in metric mode only, but still get funnies. Some progress though.
Let me go through the steps and maybe you can explain what's happening.
– I move the table to the centre of the hole pattern and zero both axes
– I select pcd mode. X and y displays show 0.00, and other display shows CNTR POS
– I press enter and down arrow. Displays show last entered diameter, and DIA
– I enter, say, 10.0 for the required pattern diameter, expecting to overwrite the stored value,but the display shows 0.1, then 0.00 when I press enter !
This was where I was previously getting stuck. However, I have just found that if I press enter again, then 10.0 followed by enter everything works correctly.
I don't understand, but this sequence seems to work reliably every time.
Any suggestions?