How-To: Make Your Own Rotary Backing Plate Extension!

  • Thread starter Thread starter opie_7afe
  • Start date Start date
rzatch said:
Both of you have made very nice extensions. The solid piece one does look more of a finished item, the tightening slot is a very nice feature. But getting back to Matt’s design if you guys think for one minute it’s going to come apart from centrifugal force then you’re just nit picking his design. I could put that collar in my lathe and spin it a whole lot faster than the rotary could ever go and it won’t come apart. Also there is no way that a rotary will ever develop enough torque to break the bolt or collar.
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I don't think anyone said it will come apart, just that it could come apart, and at a very high speed. I think people are just saying they would rather be safe than save a buck. I also worry about the vibration issue.
 
Flannigan said:
Here is how they should be made to prevent any damage. Also by making them out of one piece it won't cause any additional vibration that can cause damage to the machine. Again, not saying anything is bad, just saying there are some dangers using something like this.

DSC_0728.jpg


Also had a spot machined in to accept a wrench to tighten it.

DSC_0734.jpg
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My shaft is bigger then yours

:)
 
kronos said:
This is for a DA?
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no, a rotary. I've never seen a DA with threads that look like that. Also, I'm not convinced that a DA could use an extension. It has a counterweight, and that would throw it off.
 
i like the looks of that one flannigan,where does the backing plate go ? i know on the end but i don't see male threads, in other words is it for a backing plate system like the flex uses(nut going into polisher shaft instead of polisher shaft going into backing plate)....i tested my extension at max speed on my rotary which is around 3700 rpm and didnt feel any added vibration.i would have made a nicer extension with knurling and make it look cool but i don't have a lathe, i really wish i had a small hobby lathe...

edit: the da could probably use a small extension something 1inch or smaller, reason i say this is look at some of the backing plates for 3"-4" pads that are out one of them has what looks to be atleast a 1" extension vs a normal DA backing plate
 
opie_7afe said:
i like the looks of that one flannigan,where does the backing plate go ? i know on the end but i don't see male threads, in other words is it for a backing plate system like the flex uses(nut going into polisher shaft instead of polisher shaft going into backing plate)....i tested my extension at max speed on my rotary which is around 3700 rpm and didnt feel any added vibration.i would have made a nicer extension with knurling and make it look cool but i don't have a lathe, i really wish i had a small hobby lathe...

edit: the da could probably use a small extension something 1inch or smaller, reason i say this is look at some of the backing plates for 3"-4" pads that are out one of them has what looks to be atleast a 1" extension vs a normal DA backing plate
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On that particular extension the other end acepts a DA backing plate. It was designed so that you could put a very thin (DA) back plate on it to buff under mirrors and other areas that you normally couldn't get a regular rotary bp.
 
Flannigan said:
no, a rotary. I've never seen a DA with threads that look like that. Also, I'm not convinced that a DA could use an extension. It has a counterweight, and that would throw it off.
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I can see where the threads from the rotary would go, but how does it attach to the backing plate? I don't see threads sticking out the other end.
 
Flannigan said:
On that particular extension the other end acepts a DA backing plate. It was designed so that you could put a very thin (DA) back plate on it to buff under mirrors and other areas that you normally couldn't get a regular rotary bp.
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Opie beat me to the punch.
 
AHHHH! blind man says he can see now! LOL thanks for clearing that up flannigan good idea there!
 
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