I need to make a worm gear for a film projector If it's at all possible.
Buying the part is out of the question because it's way too expensive for me.
It's nylon or similar and appears to be prob an 8 start thread but I won't know that til I pull the covers off the projector tomorrow and have a look.
At this stage I'm guessing it will be around 30-35mm diameter and I saw a photo where the pitch was measured at 2.5mm. So if I've got that correct, means the pitch is actually 20mm for 8 start ?
Here's photos from my lathe plate and the new part.
Is there some trick to making it on my lathe ?
Gear.jpgP1030768.jpg


PS Just found the other photos.
gear 2.jpg
Attached Images




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