PC 7424xp backing plate velcro melted...what did i do?

[MrMike]

backing plate and foam pad velcro melted. Im guessing I over worked it?

[Andrew C.]

Re: backing plate velcro melted...what did i do?

What speed were you using the DA on? Can you provide us the details of what your were doing when it melted?

Contact Meguiar's Customer Service on Monday during their business hours and they should take care of you and probably get you a new backing plate.

[Bill Davidson]

Re: backing plate velcro melted...what did i do?

Sorry, I'm still laughing as I type this.
I think you're on the money. It got too hot.

Either you aren't using enough product for lubrication, you are working at too high of a speed, or the machine overheated.

I'm sure Meguiar's will take care of you, but I'd love to hear about the cause of this. We all learn something from this.

[MrMike]

Re: backing plate velcro melted...what did i do?

Meguiars has nothing to do with it, imo.

I have a PC 7424xp from an online store who gave a free 6" backing pad with purchase.

I was using a LC CCS 6.5" orange pad with UC on speed 6. About 3 hours into use. a quarter sized amount of compound was applied to the pad for every 2x2 section.

The PC gets my baking pad HOT.

[Jimmy Buffit]

Re: backing plate velcro melted...what did i do?

Meguiars has nothing to do with it, imo.

I have a PC 7424xp from an online store who gave a free 6" backing pad with purchase.

I was using a LC CCS 6.5" orange pad with UC on speed 6. About 3 hours into use. a quarter sized amount of compound was applied to the pad for every 2x2 section.

The PC gets my baking pad HOT.

We have TWO PC 7424XP, also from an online source. We are truly amazed by the results using 105 and 205. But...

The backing plate/machine combo tears up 6" Meguiar's pads

http://s428.photobucket.com/albums/q...t=DSCF0312.jpg

tremendous heat buildup at the center/rear of the pad - ~185 degrees!
Additionally, clearly the edge of the backing plate (6" Lake Country) cuts into the outer edge of the pad.

It is obvious that running the machine on speed 6 is causing the problem. But wait, there's more...

The backing plate (threaded) spindle literally came off while polishing, spun away, and the machine 'plunged' into the paint! This happened TWICE!

http://s428.photobucket.com/albums/q...t=DSCF0306.jpg

The supplier is sending two replacement units, with the PC backing plates. We've already acquired Meguiar's W68DA backing plate and a dozen 7" Soft Buff 2.0 Pads. We'll keep the speed at 5 maximum. We'll keep the pads primed and use ' enough' polish.

ANY SUGGESTIONS ARE APPRECIATED!

Thanks.

[Michael Stoops]

Re: PC 7424xp backing plate velcro melted...what did i do?

When you look very closely at how a hook & loop attachment system actually works, and then consider the movement of the pad/backing plate on a D/A you can start to see how the action is literally trying to throw the pad off the backing plate as direction is constantly changing. To prove this, mount a pad on a rotary buffer (properly centered, of course) and turn the rotary on with while just holding it up in the air. The backing plate and pad will just happily rotate in a perfect circle. Now do the same thing with a D/A, even at just a moderate speed, and the pad will break free from the backing plate and fly across the garage.

When the pad is pressed against the paint it is held against the backing plate with sufficient pressure to keep it from flying off. But it is still constantly changing direction and essentially trying to break free from the backing plate. This can generate a lot of heat, and when used in conjunction with a lot of pressure and speed that heat can be very high. We've measured temperatures as high as 231F under extreme conditions! Do that long enough and, yes, you'll break things.

Since a rotary isn't changing directions you just don't get this sort of heat at the backing plate/pad junction.

[Bill Davidson]

Re: PC 7424xp backing plate velcro melted...what did i do?

When you look very closely at how a hook & loop attachment system actually works, and then consider the movement of the pad/backing plate on a D/A you can start to see how the action is literally trying to throw the pad off the backing plate as direction is constantly changing. To prove this, mount a pad on a rotary buffer (properly centered, of course) and turn the rotary on with while just holding it up in the air. The backing plate and pad will just happily rotate in a perfect circle. Now do the same thing with a D/A, even at just a moderate speed, and the pad will break free from the backing plate and fly across the garage.

When the pad is pressed against the paint it is held against the backing plate with sufficient pressure to keep it from flying off. But it is still constantly changing direction and essentially trying to break free from the backing plate. This can generate a lot of heat, and when used in conjunction with a lot of pressure and speed that heat can be very high. We've measured temperatures as high as 231F under extreme conditions! Do that long enough and, yes, you'll break things.

Since a rotary isn't changing directions you just don't get this sort of heat at the backing plate/pad junction.

What's your recommendation. Take breaks, rotate out polishers??? Was 231F due to high ambient temperatures or prolonged aggressive use?

[Michael Stoops]

Re: PC 7424xp backing plate velcro melted...what did i do?

What's your recommendation. Take breaks, rotate out polishers??? Was 231F due to high ambient temperatures or prolonged aggressive use?

Don't run a D/A at speed 6! Meguiar's has always cautioned against using max speed on the D/A, especially for prolonged periods of time. Recently there have been several discussions on other forums about a competing brand of pads failing at a fairly high rate, and most users will grudgingly admit to running them at max speed for extended periods just prior to failure.

We reached 231F while intentionally trying to make a pad fail during testing. In this case it did not fail but we didn't run it for a long period of time either. We literally had smoke coming off the darn thing!

If you find you're in a situation where you just need the extra power that more speed and pressure can give, then swap pads - and maybe even backing plates - frequently. Some older laminated backing plates can be subject to failure if heated too high for too long, but generally the pads will fail first.

For the vast majority of correction projects, however, you shouldn't have to stress the equipment that much.

[edwin111]

Re: PC 7424xp backing plate velcro melted...what did i do?

Nice post.