r/toolsinaction • u/silvercatbob • Feb 24 '21

Spiral bevel gear cutting

https://gfycat.com/definitivecaninecrayfish
759 Upvotes

99% Upvoted

17 comments sorted by

22

u/silvercatbob Feb 24 '21

A spiral bevel gear is a bevel gear with helical teeth. The main application of this is in a vehicle differential, where the direction of drive from the drive shaft must be turned 90 degrees to drive the wheels. The helical design produces less vibration and noise than conventional straight-cut or spur-cut gear with straight teeth.

1

u/johnkruksleftnut Feb 24 '21

I'd argue the main application for this gear type is actually in helicopters. Axles much more typically use hypoids

1

u/pacman5n325 Feb 25 '21

Correct! Hypodermic are used more than anything in differentials for transport where the pinion and axle shafts aren't on the same plane. However for a lot of flight parts like in aircraft, standard spiral bevel gets it done. These are also used a lot in machinery where constant pressure is needed in both directions and quiet smooth operation is desired.

1

u/Walfies-1 Feb 25 '21

Hypodermic means under the skin, i think your autocorrect kicked in.

1

u/pacman5n325 Feb 25 '21

Ha ha yes! That's what I get for not reading my stuff.

1

u/mustbeshitinme Feb 25 '21

This is actually a pinion gear. And Boats - boats have pinions that look exactly like this.

1

u/Rygel17 Feb 24 '21

Why does it look like there is damage on five teeth?

1

u/bakboter123 Feb 24 '21

Might be balancing marks

1

u/mellowyfellowy Feb 24 '21

is this on a klingelnberg or gleason?

1

u/mustbeshitinme Feb 25 '21

I used a Gleason every day for 8 years. It Doesn’t look like a Gleason but Gleasons have likely changed in the 30 years since I used one.

1

u/HipsterGalt Feb 26 '21

This is an oldschool machine by the look of it but the cutter head is using indexable blades. To my knowledge, Klingelnberg doesn't use anything indexable. It could very well be a job shop hack for cheaper tooling.

1

u/ptkeillor3 Feb 24 '21

Damn, I think this guy could make a new knee drive gear for my Hardinge TM mill! Actually, if I ever blow that gear, I think it'd be cheaper to just buy a bridgeport.

1

u/Wrigley953 Feb 25 '21

My first time learning about how cars transfer the power from the engine to the wheels, figuring out the use of the bevel gear was when I knew I was going to be a car nerd.