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Generally, when I encountered the humming it meant that the various poles on the motor are not being enabled/disabled in a sequential order or that you are not using a high enough voltage to get the motor to turn. I had a bit of trouble getting the 5V motor I used to nicely rotate with 3.3V logic.
Hi MordiemerM,I would personally go with the B series (presuming it's not a huge element you're working with) since you can still use the B series size for some (not all) precision work as well as the larger components without taking too long or burning anything out. They're pretty versatile in that way.
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Hi quinnsullivan,Oh goodness, I haven't gotten back to that! Thank you for pointing it out. I eventually got an account (apparently by not clicking to agree to the terms and service, having it tell me I needed to, and then clicking it). I uploaded the project to there now, but I'm still waiting for it to finish uploading and give me a final url. I'll post back when I can see it.
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