Did a search, man there are a lot of drive shaft issues on this site. So if this is a repost, I'm old so I don't care.
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CK5
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Drive shaft tech video
- Thread starter ktmoutfront
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now that's driveline tech for dummy's . 
I can even understand this .
I can even understand this .
NEEDS to be a sticky. Great info. I knew fazing was very important but now I really know why. Good video. Thanks for posting 
I have always understood the principals of the design, I have never seen it shown that way. Pretty obvious now.
Awesome vid...thanks for posting it.
great video Wade, and bold highlights FTW!
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Driveshafts for Dummies. Good stuff.
I already knew about everything they were showing there, but I have never seen it demonstrated in such an obvious way with the card sound and tape on the sprockets. Nice find Wade, should show people a lot of stuff about matching angles and phasing.
A while back I initially thought driveshafts could only vibrate because they are out of balance axially, but I learned then they can vibrate with speed oscillations as well and this shows that very well.
One thing I noticed he didn't do is run the card on the center sprocket when the angles were parallel. The driveshaft itself will still be running eliptical speeds, but the matching angles almost cancel that out at the other end so that the pinion still sees a relatively constant speed.
Also, for reference, with a CV joint all of this cancelling happens at one end of the driveshaft (the double cardan CV is like a tiny driveshaft itself). Which means you want to minimize the joint angle at the other end, not make them parallel when it comes to CV shafts.
Another thing that doesn't usually work but can work is the angles have to be equal, but that doesn't mean the shafts have to be parallel. You can get a similar affect by matching the angle but in the opposite direction. I would like to see him try that on his little test rig.
A while back I initially thought driveshafts could only vibrate because they are out of balance axially, but I learned then they can vibrate with speed oscillations as well and this shows that very well.
One thing I noticed he didn't do is run the card on the center sprocket when the angles were parallel. The driveshaft itself will still be running eliptical speeds, but the matching angles almost cancel that out at the other end so that the pinion still sees a relatively constant speed.
Also, for reference, with a CV joint all of this cancelling happens at one end of the driveshaft (the double cardan CV is like a tiny driveshaft itself). Which means you want to minimize the joint angle at the other end, not make them parallel when it comes to CV shafts.
Another thing that doesn't usually work but can work is the angles have to be equal, but that doesn't mean the shafts have to be parallel. You can get a similar affect by matching the angle but in the opposite direction. I would like to see him try that on his little test rig.
Thats way too cool!
Cool vid, thanks.
I had the driveshaft shop by me spin my square shaft... They were super impressed with the fact that I actually drove with that attached to my truck, but not when the whole workbench started shaking.
I had the driveshaft shop by me spin my square shaft... They were super impressed with the fact that I actually drove with that attached to my truck, but not when the whole workbench started shaking.
