12-06-2010, 12:09 PM
Sumpter250
These neoprene or silicone tubes have an bugbear.
They are manufactured by extruding, a continous process, and after some cooling down these tubes are rolled on a drum. For this reason they got a permanent bend. I have never seen exactly straight tubes all of them had an curvature or pre-bending as memory effect.
The photo of you show this pre bending curvature.
Used as an driveshaft it will work properly as long as the two shaft ends are exact in line.
Until the first curve. Then the tube is bend under rotation. The material has to be fulled on every rotation to equalize the not in line shafts.
And there is an pre-bend in the tube.
Rotating such an pre bend tube causes in unequal forces to bend it, depending if you bend it in the direction of the pre bend oor against it.
Thus can be resulting in an unequal running of the drive mechanism.
I have found this in the www:
<!-- m --><a class="postlink" href="http://www.clag.org.uk/cv-couplings.html">http://www.clag.org.uk/cv-couplings.html</a><!-- m -->
It may help you.
Pleas excuse my bad English
Lutz
These neoprene or silicone tubes have an bugbear.
They are manufactured by extruding, a continous process, and after some cooling down these tubes are rolled on a drum. For this reason they got a permanent bend. I have never seen exactly straight tubes all of them had an curvature or pre-bending as memory effect.
The photo of you show this pre bending curvature.
Used as an driveshaft it will work properly as long as the two shaft ends are exact in line.
Until the first curve. Then the tube is bend under rotation. The material has to be fulled on every rotation to equalize the not in line shafts.
And there is an pre-bend in the tube.
Rotating such an pre bend tube causes in unequal forces to bend it, depending if you bend it in the direction of the pre bend oor against it.
Thus can be resulting in an unequal running of the drive mechanism.
I have found this in the www:
<!-- m --><a class="postlink" href="http://www.clag.org.uk/cv-couplings.html">http://www.clag.org.uk/cv-couplings.html</a><!-- m -->
It may help you.
Pleas excuse my bad English
Lutz