• If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Announcement

Collapse
No announcement yet.

Question concerning 4" and 7" pads from a new D/A user

Collapse
X
Collapse
 
  • Page of 2
  • Filter
  • Time
  • Show
Clear All
new posts
Previous 1 2 template Next
  • #1

    Question concerning 4" and 7" pads from a new D/A user

    I did some searching but didn't find an answer so here goes. Working from the premise that the 4" yellow polishing pads are produced from the same material as the 7" Soft Buff 2.0 yellow polishing pads(i.e cut,density,etc.), would it be safe to say that using a speed of 5 on my D/A with the 4" pad could be too aggressive compared to the 7" pad? Looking at it from the thought that the smaller pad is making more revolutions than the 7" leads me to think that a reduction in speed to say either 3 or 4 might be necessary to provide the same level of correction and to not possibly cause more defects. Am I working from a sound idea or should I not be worried?
    Tags: None
  • #2
    Re: Question concerning 4" and 7" pads from a new D/A user

    The smaller pad does appear to spin faster and you can really see the centrifugal forces at work as the smaller pad flattens out under speeds 4-5-6. I always dial it down a notch when using the 4" pads. For example, if I polish out a panel at setting 5 with a 7" pad, I will slow it to setting 4 if I use a 4" pad over the same panel.

    Comment

    • #3
      Re: Question concerning 4" and 7" pads from a new D/A user

      I find I get better defect correction ability with a 4" pad over the larger pads.
      Originally posted by Blueline
      I own a silver vehicle and a black vehicle owns me. The black one demands attention, washing, detailing, waxing and an occasional dinner out at a nice restaurant. The silver one demands nothing and it looks just fine. I think the black vehicle is taking advantage of me, and the silver car is more my style. We can go out for a drive without her makeup and she looks fine. If I want to take the black one out, it is three or four hours in the "bathroom" to get ready.

      Comment

      • #4
        Re: Question concerning 4" and 7" pads from a new D/A user

        also because the pad area is smaller there is more pressure on the pad and therefore more cutting action...
        Joel
        1976 Cutlass S
        2001 PT Cruiser
        1990 454SS
        1989         Suburban

        Comment

        • #5
          Re: Question concerning 4" and 7" pads from a new D/A user

          Originally posted by ClearlyCoated View Post
          The smaller pad does appear to spin faster and you can really see the centrifugal forces at work as the smaller pad flattens out under speeds 4-5-6. I always dial it down a notch when using the 4" pads. For example, if I polish out a panel at setting 5 with a 7" pad, I will slow it to setting 4 if I use a 4" pad over the same panel.
          Hate to be that person but it's centripetal forces. Centrifugal forces don't exist. Sorry, had to do it.
          Tedrow's Detailing
          845-642-1698
          Treat Yourself to that New Car Feeling

          Comment

          • #6
            Re: Question concerning 4" and 7" pads from a new D/A user

            Originally posted by Shawn T. View Post
            Hate to be that person but it's centripetal forces. Centrifugal forces don't exist. Sorry, had to do it.
            But you knew what I meant, right?
            Thank you for the clarification.

            Comment

            • #7
              Re: Question concerning 4" and 7" pads from a new D/A user

              Thanks for the confirmation folks, wanted to be sure before I put pad to paint and did some damage.

              Comment

              • #8
                Re: Question concerning 4" and 7" pads from a new D/A user

                A good check is just to use your hands and feel the temperature of the paint. If it's getting too hot then you know you are being too aggressive with the speed.
                -Bob
                NXTti graduate, Meguiars Ford/SEMA Team

                "All Corvette's are red, the rest are mistakes" - John Heinricy (Corvette Engineer)

                Comment

                • #9
                  Re: Question concerning 4" and 7" pads from a new D/A user

                  I read somewhere on here that it's something to be aware of when working on urethane bumper covers and the like.

                  Comment

                  • #10
                    Re: Question concerning 4" and 7" pads from a new D/A user

                    Originally posted by Shawn T. View Post
                    Hate to be that person but it's centripetal forces. Centrifugal forces don't exist. Sorry, had to do it.
                    Actually.... centrifugal is correct, as that is force from the center moving outward, while centripetal is from the outer edge directed inward.

                    Comment

                    • #11
                      Re: Question concerning 4" and 7" pads from a new D/A user

                      Originally posted by Mark Kleis View Post
                      Actually.... centrifugal is correct, as that is force from the center moving outward, while centripetal is from the outer edge directed inward.
                      But, according to what my teacher said last year centrifugal forces are kind of fake forces used to help solve more complex problems where contripetal force needs a certain kind reaction force to do something with the thing that I can't remember......

                      Whatever, the point is, be a little more careful with the 4" pads.

                      I think that is something we can agree on.
                      Tedrow's Detailing
                      845-642-1698
                      Treat Yourself to that New Car Feeling

                      Comment

                      • #12
                        Re: Question concerning 4" and 7" pads from a new D/A user

                        To end the debate centripetal is correct.

                        Centrifugal force is a fictitious force that exists only in a non-inertial frame of reference which is a reference frame undergoing either acceleration or deceleration, and they are used to explain observed motion that arrises from that acceleration. this allows the system to adhere to newton's second law F=d/dt(mv)

                        Now there is also a reactive centrifugal force which is derived from the presence of the centripetal force when a mass undergoes curved motion such as circular motion, where the centripetal force is acting on the mass by another object and Newton's third law states that the mass exerts and equal and opposite force on the object. It is directed away from the axis of rotation and is exerted by the mass on the object.

                        here's a diagram of uniform circular motion to clarify:



                        hope this helps.

                        Comment

                        • #13
                          Re: Question concerning 4" and 7" pads from a new D/A user

                          Don't bring me back to my AP Physics C class. Scary times. lol

                          Thanks for the diagram though.
                          Tedrow's Detailing
                          845-642-1698
                          Treat Yourself to that New Car Feeling

                          Comment

                          • #14
                            Re: Question concerning 4" and 7" pads from a new D/A user

                            I will ask my professor to see if he believes that the pad rotation is caused by centripetal force or if the pad could be considered a non-inertial reference frame in which case i believe both forces are present.

                            Comment

                            • #15
                              Re: Question concerning 4" and 7" pads from a new D/A user

                              Geez, all i asked was if I should slow the speed down with the smaller pads.....

                              Comment

                              Previous 1 2 template Next
                              Your Privacy Choices
                              Working...
                              X