With the diameter of drill that you are using, I suspect that you have a
problem with the method used to attach the panel stack to the drilling
table. This could be due to oversize soft tooling holes to name just one.

Dave Rooke
Circo Craft - Pointe Claire

______________________-
>I am in the manufacturing of bare pcb boards. Lately I have been having
shifting
>problem in the drilling section. Sometimes its just a few holes that's
>shifted. Sometimes its random shift. Observation shows the shifting happens
>more on the smaller diameter holes, 0.65mm to 0.80mm. Glad to hear any
>suggestion that can help me overcome this problem. Thanks
>
>Bobby
>
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