From:sochi
We have outlined the causes of the deviation, shift and misalignment, along with the solutions to remedy the issue.
The causes of these discrepancies are as follows: the drill bit is shifted during the drilling process; improper cover material; the hole position shifts due to the rise and shrinkage of the base material; improper use of the positioning tools used; improper setting of the presser foot during drilling, causing the production board to move when it hits the pin; resonance during the drill bit operation; unclean or damaged spring chuck; production board, panel off-hole or whole stack position shifted; the drill bit slips when in contact with the cover board; the surface of the aluminum sheet gets scratched or creased when guiding the drill bit down; no pinning of the drill bit; the drill bit is not shifted when in contact with the cover board; sliding of the cover plate; scratch or crease on the aluminum sheet surface of the cover plate, resulting in deviation when guiding the drill bit down; no pin hit; different origin points; adhesive paper not firmly affixed; X and Y axes of the drill machine show movement deviation; and problematic program.
