G'day Gary, You said
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Everyone autoguides because pec is not perfect.
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Yes that is true, as I indicated earlier I have an easy guider on order; in the mean time If PEC was working for me I could manage a few good imaging sessions. I can always use an offset filter to fix egg shaped stars; PEC working would involve less post processing.
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The actual worm gear is not hobbed with an exactly matching profile to the worm.
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I think you mean lapped. Hobbing is only a special type of milling operation.
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BTW, you do not need an expensive extra scope to autoguide, go to:
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I saw that or the prototype about 18months ago. The trouble with that is flexure. Unless mounted on a decent dovetail plate system.~ $350 it'd be a waste of time and a Dovetail plate on an ED 80?
It might pay me to have a new worm and wheel precission ground and lapped if the existing ones are easy enough to duplicate. The PE errors are really quite abrupt; worse that your bad one, though not as extensive.
Since nobody is popping up to tell me I'm recording or playing back incorrectly, I guess the problem is with the 'Clayton's' PEC training sub routine.
cheers,
Doug