Chain Porn - Kawasaki KLR 650 Forum
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post #1 of 29 Old 12-21-2018, 08:14 PM Thread Starter
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Chain Porn

Perhaps about as exciting as PAC10 football for some, but I found these chain-related videos interesting.........


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post #2 of 29 Old 12-21-2018, 10:59 PM
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1. "How It's Made." The industrial-strength chain manufacturing process was interesting. No O-rings or X-rings on these chains, I imagine because . . . at the beginning of every shift, someone must anoint the chain runs by pouring 5-gallon buckets of foul-smelling green lubricant on the entire run. No O-rings/X-rings necessary with such periodic total immersion lubrication. Leastwise, that was my job each day while working on a steam-powered oil drilling rig . . . the chain shown in the video clip appears rather huge, but . . . imagine the chain size necessary to pull 10,000 feet of drill pipe from the earth!

2. Drag-racing Motorcycle Chain. Fascinating! Might be adjusted correctly for the straight-and-level drag strip, but . . . statically, looks kinda TIGHT in the view shown, to me, in comparison with a street/trail bike configuration.

Thanks for sharing, planalp!
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post #3 of 29 Old 12-22-2018, 06:55 AM Thread Starter
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I searched but couldn't find any videos of o/x-ring chain production. Easy enough to envision how those extra steps occur, I guess.

I found the chain video interesting. I'm still trying to figure out if that rear sprocket has some kind of intentional sawtooth design or if the camera angle just makes them appear to be curved. I'm sure a chain probably does the same thing to a lesser degree on the motorcycles we all ride but it shows just how dynamic a chain can be. Maintain That Chain!

As Damocles noted, when sitting still that chain looks like it's very tight but once stuff start's happening, it's flailing around like one of these:

(Drag Racer in the foreground. Planalp in the background.)

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post #4 of 29 Old 12-22-2018, 11:29 AM
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Quote:
Originally Posted by planalp View Post
I'm still trying to figure out if that rear sprocket has some kind of intentional sawtooth design or if the camera angle just makes them appear to be curved.
I, too, noticed the saw-tooth appearance of the rear sprocket; and, like you, discounted the image as an optical illusion/distortion of some sort.

In my opinion, one wouldn't want to drag-race with a sprocket actually having a saw-tooth profile. Throwing a chain at full power and 100-or-so miles-per-hour could result in unhappy outcomes, IMHO, especially considering the barrier and/or the vehicle in the adjacent lane!
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post #5 of 29 Old 12-22-2018, 12:25 PM
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it's just the camera angle and taper of the teeth; no hooks.

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post #6 of 29 Old 12-22-2018, 12:48 PM
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Fascinating that the chain looked tight when stopped, yet like it was going to jump off the sprocket under power.

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post #7 of 29 Old 12-22-2018, 07:28 PM
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Fascinating that the chain looked tight when stopped, yet like it was going to jump off the sprocket under power.
Not to wander too far into the realm of my own FANTASY, but . . . could the phenomenon be a function of CHAIN STRETCH? Under power, the elasticity of the upper chain run might create a little slack; resulting in the video image of the flopping lower chain run.

That said, the chain stretch mentioned above might NOT exceed the elastic limits of the chain, thus permitting return of chain to its original length at rest.

Again; postulation only; no observations/measurements/references available.
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post #8 of 29 Old 12-22-2018, 08:12 PM Thread Starter
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16th-Century DaVinci sketch. From "The Wikipedia."
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post #9 of 29 Old 12-22-2018, 08:30 PM
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Quote:
Originally Posted by Damocles View Post
Not to wander too far into the realm of my own FANTASY, but . . . could the phenomenon be a function of CHAIN STRETCH? Under power, the elasticity of the upper chain run might create a little slack; resulting in the video image of the flopping lower chain run.

That said, the chain stretch mentioned above might NOT exceed the elastic limits of the chain, thus permitting return of chain to its original length at rest.

Again; postulation only; no observations/measurements/references available.
I'll suggest that the drag bike has a very limited amount of rear suspension travel and it is ALL above the center line of Front sprocket, Swingarm pivot & Rear axle centers.

So 'normal' chain tension with the bike elevated would be near 'zero slack'.

With no load on the bike but with wheels on the ground there would be some slack. When launched & accelerating the rear suspension would compress, the wheelie bar would contact the ground and nearly 100% of the bikes weight and therefore traction would be on the rear tire.
As the acceleration tapers off the suspension would start to re-extend and the slack would be lessened.
When the front brake is then applied at the end of the run the slack would again return to 'zero'.

The sides of the rear sprocket tooth valleys are 'fluted' to reduce weight. Some dirt bike sprockets were 'fluted' to allow mud disbursement and reduce weight.

Welcome back, Planalp. I enjoyed the clips.
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post #10 of 29 Old 12-23-2018, 02:34 AM
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I'll suggest that the drag bike has a very limited amount of rear suspension travel and it is ALL above the center line of Front sprocket, Swingarm pivot & Rear axle centers.

So 'normal' chain tension with the bike elevated would be near 'zero slack'.
Agree!

In fact, SOME drag bikes have swing arms that do not SWING; true "hard tails" with solid struts replacing rear spring-and-shock assemblies.

CAVEAT: Neo-off-topic comment follows: Ain't sure, but . . . I think some sport ATVs featured geometrical design with "constant radius" geometry between front and rear sprockets, wherein chain slack remained the same throughout suspension compression/extension. Maybe not, but . . . would be a difficult trick anyway with conventional motorcycle front and rear sprocket placement, IMHO.
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