Thanks for the reply Imran,
I checked the distance between the read head and the tape and it doesn't vary. What i did however just try, was zeroing the read head at 600mm and 800mm and then again at my known point of 86.1mm. Then when i put it back to 800mm it was reading correctly. I then put the fence to 700, then back to 100mm stopping to check every 100mm, and every time it was spot on regardless of which direction i was travelling. I really can't explain what happened. It's like it calibrated the readhead on the tape or something. Is that even possible? I thought the mag tape was based on alternating magnetic fields that were spaced 5mm or whatever apart. Again, i cannot explain it, but it looks as though the descrepancies i was getting are resolved.....Ok, after i wrote that, i realized i hadn't taken the fence off, put it back on and zeroed it again at my known point, so i just went and did that, and sure enough, it is reading dead on again! It looks like it's spot on thanks Imran, I don't know how you did it, but you did it!!! ?
I will have to keep an eye on this over the next few days or even weeks, and keep checking it. I will report back in a while and let you know what if anything i have found. Hopefully it is now resolved, and the issue doesn't occur again.
Regards,
Bryce
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Bryce Comer