Re: Only 14 gear ratios? Primitive!

On Wed, 04 Dec 2024 14:44:12 -0500, Frank Krygowski wrote:

On 12/4/2024 12:47 PM, cyclintom wrote:

On Wed Dec 4 00:05:00 2024 Frank Krygowski  wrote:

Bike transmissions: Derailleurs are easy to understand. Internal gear
hubs are more complicated. (When I was teaching, I had our machinist
do a cutaway of a Sturmey-Archer AW hub and mount it on a display
stand near an explanatory poster, so interested students could see
what made it work.)
>
Rohloff 14 speed gear hubs are an order of magnitude more complicated
than AWs. But this new gizmo makes a Rohloff look like child's play.
It's a true continuously variable transmission, with an infinite
number of gear ratios, that is completely gear-based. No slipping
surfaces, and supposedly minimal friction losses.
>
Here's the link to the half hour explanation video:
https://www.youtube.com/watch?v=mWJHI7UHuys You may want to start at
about 14:30 before returning to the beginning to digest the
super-complicated explanation of it's operation.
>
No info in the video about prototype weight, efficiency, etc.
>
>

So this is something you consider "super complicated" is it? All
anyoine should have needed is to see the levers slidding in the slots
to grasped the method that was used to both make the tranmission
continuously variable and limit the upper and lower ratios. But I
suppose you needed a half hour showing gears to grasp the idea.

 
Yes, Tom, I do consider that mechanism to be super complicated.
 
Of course, all of us here are familiar with your status as a mechanical
genius. ... um, one whose cranks fall off his bike, whose handlebars
slip, whose seatpost slips, whose derailleurs frequently don't work, who
needs special "non-stretch" cables ...

It doesn't surprise me at all that a man that was fired as a plant
engineer believes a constant velocity transmission with cam operated
sliding ration adjusters would be "very complicated." I designed most of
the hardware for many instruments from the ProPette, the Progroup which
added a turn table with test tubes besides the 3 dimentional plate
mechanism to the mechanical heart valve in my  heart/lung machine.