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    stephenwyker
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P/T accuracy

I'm sure this has been discussed before, but how does one deal with a college and repeatability? I was to do a 2x6 college (which looked great) but then the client also wanted another look around the room for opening. I didn't think about it until rehearsal and clicked back to the college and all the alignment was off. Not by a lot, but enough that the college couldn't work.

Thought it was my programming, updated and tried again and same situation. Any good advise (besides not moving them)
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    Stephen,

    A couple of things I always recommend to make sure you get the best accuracy/repeatability out of the fixtures:

    1) Clean the encoders. Because the DL.3s/DL.2s use an optical encoder for high accuracy, they are also more sensitive to dust and other debris. This is why we added dust covers to the encoder wheels, but they can still get gunk on them. A soft cloth with isopropyl alcohol is best, and make sure you clean both the top and the bottom.

    2) Make sure the pan belt is tensioned properly. Over time, the rubber teeth on the belts wear away creating a bit of slack in the belts (this also creates some of the dust that gets on the encoders!). All you have to do is loosen the 4 bolts that hold the pan motor plate to the chassis, allow the spring attached to the plate to tension the belt, and re-tighten the 4 bolts.

    3) After the encoders are clean and the pan belt is re-tensioned, run motor calibration as Marty stated. Be sure the fixture is very still for this as the calibration routine is very sensitive (no swaying truss, people bumping the fixtures, etc). Calibration should take less than 2 minutes.

    Also, as Chris stated above, it's not a bad idea to make sure that the set screws on all of the pinion gears are tight to the motor shaft.
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    Stephen,

    A couple of things I always recommend to make sure you get the best accuracy/repeatability out of the fixtures:

    1) Clean the encoders. Because the DL.3s/DL.2s use an optical encoder for high accuracy, they are also more sensitive to dust and other debris. This is why we added dust covers to the encoder wheels, but they can still get gunk on them. A soft cloth with isopropyl alcohol is best, and make sure you clean both the top and the bottom.

    2) Make sure the pan belt is tensioned properly. Over time, the rubber teeth on the belts wear away creating a bit of slack in the belts (this also creates some of the dust that gets on the encoders!). All you have to do is loosen the 4 bolts that hold the pan motor plate to the chassis, allow the spring attached to the plate to tension the belt, and re-tighten the 4 bolts.

    3) After the encoders are clean and the pan belt is re-tensioned, run motor calibration as Marty stated. Be sure the fixture is very still for this as the calibration routine is very sensitive (no swaying truss, people bumping the fixtures, etc). Calibration should take less than 2 minutes.

    Also, as Chris stated above, it's not a bad idea to make sure that the set screws on all of the pinion gears are tight to the motor shaft.
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