Questions about mechanical parts

Polymer Craft Machine Development
1

1. For the main frame, I see Dave and others weld the frames in addition to tightening with screws. Is it a must for welding? Locally, we need a license to weld! (which we obviously lack as students)

2. About the motor. I have a motor as belows, planning to reduce its speed with reducer. The power should not be a problem. But:
(a) How can I couple this shaft to a worm? How exactly do people call these shafts with a notch?
Ans: They are called keys and keyways. Keyway couplers serve the purpose well.

(b) Is it a monophase or triphase motor?
Ans: This is a monophase motor because triphase ones don’t use capacitors and there are only two power connections in the wiring (U1 and U2).

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3

@wkhs just in case you wonder, I too have a motor with keyway, and I got my Jaw Coupling from here:

*20mm coupling (for the hex bar): https://www.amazon.com/gp/product/B003HIWPBE/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
*Spider (goes between both jaw couplings): https://www.amazon.com/gp/product/B003HIWQN6/ref=oh_aui_detailpage_o04_s01?ie=UTF8&psc=1
*25mm coupling (this was the diameter of my motor’s shaft): https://www.amazon.com/gp/product/B003HIWPCI/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

5

1: Thanks @davehakkens! How about the shredder parts? It’s not a must to weld, I guess? (Except, well, the sieve perhaps…?)

2a: I have found a specialized coupler for these “keys”. See the attached for the nomenclature

2b: I got an answer from the excellent stackexchange.