Thanks for the ideas Scott, I appreciate your reply.
On small or thin acrylic, eg 3mm there is no problem.
ON 10mm, there had been a noticable lean to the left on pieces cut., as if the bean was not vertical, but left & right edges had a leftward lean, front and back were OK.
I agree, it is as if the beam is off centre just a tad, but the lens does not seem to be adjustable.
I am sure the bearings and belts are OK.
I spent 7 hours yesterday cutting 6" letters in 10mm acrylic with it, and it was fine, except for the noticably smaller front face, but I was glueing 3mm acrylic over it, so it looks fine with a face overlap of a small amount. 100% power, 0.8% speed, almost 6 minutes average per letter in 10mm stuff.
The start and end points were not obvious at all this time.
Whereas last year they were a defuinite bump as if there ws potential slop or drag/friction in the system.
So far so good - it must be a lead to plug connection I'm thinking, that was the cause of the main problem I had- and after sitting overnoght to settle, it comes back to good again...
Thanks again
Best wishes,
Ian
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