How a differential gear works (1937) [video] • Hacker News Board

Re: How a differential gear works (1937) [video]

#31

Post by mxfh » Mon, Oct 27, 2014, 11:37 AM UTC

Around the Corner (1937)

Producer: Handy (Jam) Organization ☞

Sponsor: Chevrolet Division, General Motors Corporation

Probably the source of this re-encode, with significantly less artifacts, on archive.org: https://archive.org/details/Aroundth1937

☞ Named after Jam Handy: https://en.wikipedia.org/wiki/Jam_Handy

Re: How a differential gear works (1937) [video]

#32

Post by haphazardeous » Mon, Oct 27, 2014, 11:58 AM UTC

Brilliant video. It's definitely a lot better to see the basic principles and evolution of those principles in action.

Re: How a differential gear works (1937) [video]

#33

Post by VLM » Mon, Oct 27, 2014, 12:18 PM UTC

I'd like to see a Torsen gearcase. Strange little things, they look like pepper grinders.

Re: How a differential gear works (1937) [video]

#34

Post by smilefreak » Mon, Oct 27, 2014, 12:35 PM UTC

I guessed some of the next steps, and considering I have the automobilic knowledge of the ancient greeks, that was pretty impressive.

An education in how to present to a lay audience.

Re: How a differential gear works (1937) [video]

#35

Post by draker » Mon, Oct 27, 2014, 3:29 PM UTC

I had not seen this particular video but have seen the "How a manual transmission works" from the same series.

https://www.youtube.com/watch?v=aAWxZRuBXtw

Re: How a differential gear works (1937) [video]

#36

Post by k2enemy » Mon, Oct 27, 2014, 3:34 PM UTC

spiritplumber wrote: post #5

If you like videos like this, check out Retrotechtacular on Hackaday. They have a series on mechanical firing computers on navy ship that is nothing short of mech-eng porn, and I mean the classy kind.

That was amazing, thanks. I found the integrator and multiplier especially simple and clever.

Here is a link to a youtube playlist: https://www.youtube.com/user/navyreviewer/videos?query=mecha...

Re: How a differential gear works (1937) [video]

#37

Post by noblethrasher » Mon, Oct 27, 2014, 3:51 PM UTC

charlysisto wrote: post #18

I was generally not bad at physics but I remember not getting my head around this one... What a great lesson for decoupling systems. I wonder what's the software equivalent in design pattern land. The facade maybe ?

Not sure about a corresponding design pattern, but the content neatly maps (no pun intended) to function composition.

Re: How a differential gear works (1937) [video]

#38

Post by jonmrodriguez » Mon, Oct 27, 2014, 4:07 PM UTC

Is it possible to create a "negative differential gear" that puts more torque into the wheel that is stuck? (in the hopes of forcing it unstuck)

Re: How a differential gear works (1937) [video]

#39

Post by clebio » Mon, Oct 27, 2014, 4:20 PM UTC

The actual explanation doesn't start until about 2 minutes in: https://www.youtube.com/watch?v=K4JhruinbWc#t=110

Re: How a differential gear works (1937) [video]

#40

Post by birdmanjeremy » Mon, Oct 27, 2014, 4:23 PM UTC

jonmrodriguez wrote: post #38

Is it possible to create a "negative differential gear" that puts more torque into the wheel that is stuck? (in the hopes of forcing it unstuck)

Yes. You are referring to a locking differential, of which there are several types. Some use clutch plates, and will work even if one wheel has no traction at all, others use more complex gearing and can transfer torque from one to another at some multiple (called a Torsen Differential) and cannot drive when one wheel is completely unloaded.