bandsaw gearbox gears need to have helix angle?

metalmagpie · Jan 19, 2020

Old Rockwell Delta 20-365 vertical bandsaw with 2-speed gearbox. Gears are bad, don't know how. These 4 gears have a small helix angle, maybe 8 degrees. My old Walker Turner gears also had a helix angle.

Wondering if these gears could be replaced with stock gears with straight teeth. What bad thing would happen if this were done?

metalmagpie

steve-l · Jan 19, 2020

metalmagpie said:
Old Rockwell Delta 20-365 vertical bandsaw with 2-speed gearbox. Gears are bad, don't know how. These 4 gears have a small helix angle, maybe 8 degrees. My old Walker Turner gears also had a helix angle.

Wondering if these gears could be replaced with stock gears with straight teeth. What bad thing would happen if this were done?

metalmagpie

Noise and more noise.

johnoder · Jan 19, 2020

As far as swap in off-the-shelf straight cut, unlikely simply due to center distance

Quieter isn't the only reason for helical gears - some of the reason is to make what you want to FIT on a particular center distance

Helix angle is related to center distance - and center distance (or helix angle) is ADJUSTABLE in the design stage

A fact is hidden in the thumbnail

The Diametral Pitch (everybody says DP) is being revised from 4 normal to 3.84 in the plane of rotation (I think I got that right)

metalmagpie · Jan 19, 2020

Traveling without access to my library. I was thinking straight gears because they can be cut in a home shop. Is there any straightforward way to make helical spur gears in a home shop without a universal mill with rotating table?

metalmagpie · Jan 19, 2020

Just remembered I have a friend who owns an old gear hobber. Can someone please point me to a reference where I can learn how to pick a hob to cut these particular gears?

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bandsaw gearbox gears need to have helix angle?

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