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It sounds to me like you have the pot not wired correctly.
To get a variable voltage connect the "top" of the pot to a supply, the "bottom" to 0 volts (ground) and the wiper to the analogue input.
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If you are running a dual core processor it may be sharting the work and not doing it in the right chronological order. There is a way of telling a program to only run on one processor somewhere...

I am a Mach3 user and wanted to use large buttons for start/stop etc somewhere near to the front of my X3 mill. I bought a touch screen with usb interface about 6 x 4 inches. Using the Mach 3 screen...

I have seen this, only bvery occasionally the Mach3 misses a line - don't know why but it always appears to be the Z up move. I have reduced the incidence of this by making sure the computer is not...

I have similar problems. The "cheap" chinese PSU keeps the primary side capacitor charged even after switch off and the 48V output drops to zero. Beware - it is at 450V dc. We check the volts with a...

Try bobcadcam, they will do post procesors for bobcad users.