Measurement of the upper arm to lower bed alignment is done by measuring the average of the needle centering front to back, starting with the “closest needle.”
Color change to the closest needle (annotated in the base casting, right front corner). Move the needle to bottom dead center and center the needle plate on the needle. If you are not able to bring the needle down into the needle plate hole, the head is out of alignment and the machine will require shipment to the factory for depot repair.
Compare the centering of Needles 1 and 16 in the needle plate hole. If the difference between the two is greater than +/-0.004” [0.1mm], the head is out of alignment. There is no way to measure head alignment. If a visual comparison of the needle centering of Needles 1 and 16 are substantially different, the head is out of alignment and requires realignment. This is best done at the factory and Melco Technical Support should be contacted if this situation is discovered.
Head alignment is best performed at the factory with specialized tools and fixtures.
When a head needs to be realigned on an AMAYA, email Melco QualityAssurance@melco.com prior to attempting to align the head for specific instructions.