My CNC Router is Plagued with RF Electrical Interference and Triggering False Limit Switch Contacts

I cannot run my home built CNC router without using Mach3's software settings to help filter out all the noisy lines that gives Inputs false positive triggers and halting the machine. The input lines going to the parallel port are for the limit and home switches. I have already grounded all the parts of the machine and that has helped some but it is still necessary to use the De-bounce function in Mach3 control software to run properly.
In this video I show the symptoms of false triggers and how you can use software to help alleviate the problem. A optical isolator breakout board is also wired and tested as a possible means to resolving this problem.

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