Can someone help me understand forced rotation?

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gofastman

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I was wondering, does the flex VRG have 2 axes of rotation? That is, does the spindle rotate and orbit around? Or is the pad locked in place and it only orbits around the center point?

I ask because I just bought a dynabrade for my rotary. It seems very well made, I guess I was sort of expecting a little more mechanical sophistication, like a planetary gear setup or something.
Are all forced rotation machines similar in the way they move?
 
Here's a parts list and exploded view of the
Flex 3401 that shows the direct drive gearing,
along with the orbital gearing's "offset-pinning"...
{I once had a (bad) habit of just calling them
concentric/eccentric drives.}

Parts for XC3401VRG | Powerhouse Distributing


Hope this helps out a little bit.


Bob
 
being forced rotation (gear driven) means that it will consistently spin/rotate (no matter how much pressure is applied), but you already knew that. as far as having the same rotation pattern/footprint like other 8mm throw traditional PC-style DA's, i have wondered that as well. it seems like it would be a little more refined in pattern (maybe less curvy). hopefully someone can chime who knows for sure as i have wondered this as well for quite some time. btw, the flex 3401 is a beast...
 
VISITOR said:
as far as having the same rotation pattern/footprint like other 8mm throw traditional PC-style DA's, i have wondered that as well. it seems like it would be a little more refined in pattern (maybe less curvy). hopefully someone can chime who knows for sure as i have wondered this as well for quite some time. btw, the flex 3401 is a beast...
Click to expand...

As I said in my previous post, Todd Helme (perhaps in conjunction with Kevin Brown) had a thread somewhere where he detailed the pattern (using a backing plate with pens or pencils stuck in it) of the Flex, but I can't find it.

Edit: I'm going to say it was an old TID thread, which would be somewhere in the Autopia archives.
 
In the case of the Flex 3401, take a standard random orbit machine, like the PC 7424xp.

Then imagine a series of teeth inside the spindle housing, and a backing plate with a corresponding series of teeth.

These teeth engage as the spindle travels around the housing, thus preventing any slippage.

There was once a thread here asking if the PC could be converted to forced rotation. There is, but it would involve customization to the spindle housing, and backing plate. Basically, teeth would need to be added, and adjustments to accommodate space for such a modification, etc...
 
So it would seem to me that the rotation of the spindle in indeed locked in place.
I was thinking it was sort of like the earth and sun, the earth rotates around its own axis and obits around the sun. I guess it's sort of like if the earth was locked in place facing one direction and it orbits the sun
 
FUNX650 said:
Here's a parts list and exploded view of the
Flex 3401 that shows the direct drive gearing,
along with the orbital gearing's "offset-pinning"...
{I once had a (bad) habit of just calling them
concentric/eccentric drives.}

Parts for XC3401VRG | Powerhouse Distributing


Hope this helps out a little bit.


Bob
Click to expand...
That's perfect, thank you! Pictures are very helpful to me. :dblthumb2:
 
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