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

  • Thread starter Thread starter opie_7afe
  • Start date Start date
chinese bolt? for hardware i only buy made in usa sir.i dunno why you guys are putting my idea down so much saying it will fail, its not like its holding up 1000 pounds of cement or something its for a buffer one made out of gold would probably work just as good.is it because its not bought and its made? what is it??? if your just going to say its going to break and post negativity then please dont post. steel has a fairly high tensile strength i doubt it will break. as i said each their own you dont need to make it but you guys dont need to say it will break because if you had any mechanical ability you would know the limitations of a 5/8th inch bolt, smaller bolts hold together engines for crying out loud.
 
opie_7afe said:
chinese bolt? for hardware i only buy made in usa sir.i dunno why you guys are putting my idea down so much saying it will fail, its not like its holding up 1000 pounds of cement or something its for a buffer one made out of gold would probably work just as good.is it because its not bought and its made? what is it??? if your just going to say its going to break and post negativity then please dont post. steel has a fairly high tensile strength i doubt it will break. as i said each their own you dont need to make it but you guys dont need to say it will break because if you had any mechanical ability you would know the limitations of a 5/8th inch bolt, smaller bolts hold together engines for crying out loud.
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Don't take it so personal. Your idea seems like a good one, that is as long as it doesn't go snap, crackle, BOOM!

This is a discussion forum, no?
 
yes but everyone seems to say "it will break" without providing any knowledge of the true concerns of how and/or why it would break, you just say " it will break" and thats it, there is probably more of a chance my rotary will break before the extension will......anything can break but something like this breaking or "blowing up due to centrifugal force" is a crock to say the least....it seems like if its not bought from AG your in the wrong for posting about it and its a crap product that will fail....i really am tired of it, just because im young don't mean i'm an idiot. and to further prove my bolt will not snap is this link showing bolt strengths in all regions i doubt even if i used a grade 2 bolt it would snap from polishing paint....Bolt strengths
 
If you are not able to handle some honest friendly constructive criticism then perhaps go don't post or try the Barney forum.
 
I come from a generation where things were made out of necessity and not purchased at the local box store. You are not the only one to make this style of extension for a rotary. One member over on DB makes these and sells them on the forum. I like your idea of drilling and pinning them as a saftey feature. I've seen others welded or loc tite used . I would not be afraid to trust the extension that you have made and see no reason it would self destruct any more then a store bought unit. Just remember this is a discussion forum and everone is entitled to their own opinion. Peace.
 
Matt, it's not a bad idea. I would check out this link since it includes the shear strength of the bolts which for this case would be the big issue. For those that aren't sure what shear strength is, think of it like this: Ever break a bolt that is stuck (say on a car) and by twisting the head, you get the bolt to twist off? I guess that's the best way to put it. Anyway, the bolts are going to experience a lot more shear. however, because the rotary head is spinning at the same rate as extension, and the pad is spinning as well, I don't see why a grade 8 bolt would have issues. If you're holding the pad from moving, then i could see an issue. Anyway this is link. This is for a grade 2 bolt remind you Bolt strengths
 
Dr Oldz said:
If you are not able to handle some honest friendly constructive criticism then perhaps go don't post or try the Barney forum.
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i dont see how your comments were constructive, but hey if you think they are then great....im not going to banter back and forth with you older guys because you are set in your ways ect....its ok though its just text and dont bother me one bit lol
 
opie_7afe said:
i dont see how your comments were constructive, but hey if you think they are then great....im not going to banter back and forth with you older guys because you are set in your ways ect....its ok though its just text and dont bother me one bit lol
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Damn those old guys with their common sense!! Im the MAN

Seriously, no one has brought age into the argument except you. Obviously you are sensitive about it. No one is saying you are a dumb kid. You posted an idea on a public forum and you are getting feedback, that's how it works.

PS to the other poster, I sold some on DB, but they were machined out of solid metal, not threaded together.
 
opie_7afe said:
i dont see how your comments were constructive, but hey if you think they are then great....im not going to banter back and forth with you older guys because you are set in your ways ect....its ok though its just text and dont bother me one bit lol
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My bad, I forgot I am older. Have a nice day my friend. I am going to bed. The nursing home is taking us on a field trip tomm. The Depends factory. I am so excited and they are gonna hand out free samples! WOOOOHOOOO!
 
Way to save a buck and create your own backing plate extension Matt! :dblthumb2:

While everyone is entitled to their opinion, lets keep this thread on track and leave the passive-aggressive comments to ourselves. There is no reason for personal attacks or demeaning comments towards others, direct or indirect, because we're all here to help each other out and provide new and fun ideas to make car care that much more enjoyable. ;)
 
i do not want conflict nor do i want this type of nitpicking or arguing going on, i highly doubt the mods want arguments going on in this forum either.this ends here and now please just stop with the rude comments that have been made.i just don't want arguments. i hate arguing, i don't even argue with my wife and she loves to argue.....
 
opie_7afe said:
i do not want conflict nor do i want this type of nitpicking or arguing going on, i highly doubt the mods want arguments going on in this forum either.this ends here and now please just stop with the rude comments that have been made.i just don't want arguments. i hate arguing, i don't even argue with my wife and she loves to argue.....
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Nice Job Opie, I just made one myself a couple weeks ago but didn't post anything, used some 5/8" allthread from Menaards along with a coupler nut, spent like 5 bucks on it and then after measuring and cutting it to the right length, I used some Loctite on the threads and it works like a charm!

Way to go my man, thanks for the write up!

Tom
 
not a problem tom, thanks for the compliments!
 
Flannigan said:
PS to the other poster, I sold some on DB, but they were machined out of solid metal, not threaded together.
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Any chance you have any of these left Dave? I wish I would have gotten one then. I would love to get one now, if possible.:hungry:
 
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
 
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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Oh ya, this is the one I want...Im the MANIm the MAN

Flannigan said:
I think I have one more Tad, let me check and get back to you.
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Please do buddy, I would LOVE to have one!! Those are awesome!!!
 
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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