G100/PC - Should it be spinning all the time?
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Thread: G100/PC - Should it be spinning all the time?

          
  1. #1
    Registered Member Monk's Avatar
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    G100/PC - Should it be spinning all the time?

    G100/PC - Should it be spinning all the time?

    I'm signed up for the Tampa Class and have ordered the Mike Phillips DVD on the Corvette, but meanwhile--am I better off letting the PC spin, or applying pressure. (I read about the 20 pounds of pressure)? Seems any pressure and it basically stops spinning and just vibrates.

    I can't eat or sleep until I get this squared away.

  2. #2
    Registered Member Pete-FWA's Avatar
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    There are some great guides that Mike put on the board. One of them talks about speed, and it can be found under the G100 forum.

    Product and Speed Guide


    With regard to pressure, I'll see what I can find and link that one here as well.
    See the big picture, enjoy the details

  3. #3
    Registered Member Pete-FWA's Avatar
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    Here's the other link I promised. This is a thread Mike did to show the pressure needed in various situations with a DA polisher.

    Pressure for DA Polishing
    See the big picture, enjoy the details

  4. #4
    Registered Member Monk's Avatar
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    Thanks for taking the time to find that link. I have seen the speed guide, and the pictures and description with the scale, (i.e. that link) but if it isn't rotating, the speed just increases the vibration with no rotation, and it seems to me that the slightest pressure, even the weight of my hands and arms, stops rotation. Maybe the PC is defective (can't be me, right?). We are at a speed setting of 5.

  5. #5
    Registered Member Pete-FWA's Avatar
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    Sorry, misunderstood your question

    I write my product numbers on the side of my pads with black marker, so it's very easy for me to pick up the rotation as it does or doesn't occur.

    How are you gauging the rotation? Some people's eyes play tricks and they don't pick up the motion and only feel the vibration, so they assume the circular motion has ceased.

    What size pad are you using? Pads bigger than the 6.5" will bog a Porter Cable machine into submission. These machines are not overly powerful since they were originally designed for wood sanding. Excess friction in the way of great downforce, excess product, or greater than normal contact surface area will slow their circular motion.
    See the big picture, enjoy the details

  6. #6
    Registered Member Monk's Avatar
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    "Sorry, misunderstood your question"

    I probably wasn't clear.

    "I write my product numbers on the side of my pads with black marker, so it's very easy for me to pick up the rotation as it does or doesn't occur."

    Funny--I do the same. And that is how I gauge the speed. I physically watch the pad slow down and speed up from the markings, and can put my finger on it and feel it not rotating--just shaking/vibrating. I about have to lift the PC to get the pad to rotate. I am using the Megs pad 8006/9006.

  7. #7
    Registered Member Pete-FWA's Avatar
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    When I went in business professionally in 1993, I used a pneumatic DA for a finishing polisher. The trick was to get those to be slow enough to be controllable and to polish effectively.

    The PC is on the other end of this spectrum. As you seem to have experienced, a little pressure really has an effect on slowing this machine. The PC is very gentle and is nowhere near as powerful as a rotary or even some other types of polishing machines.

    Accumulator, I do believe, has some experience in comparing the PC against other DA-style polishers. Hopefully we'll have his words on the topic to help you.

    If yours is simply stopping its rotation, that's not good. Is this your first/only PC or DA polisher? I ask because I wonder if you have a machine to compare it against. What gauge and length extension cord are you using (I'm grasping at straws now)? Is your machine getting very hot as you use it?

    Rotation is very important. I have noticed the PC's rotation is less (under 15-20 lbs downforce) than on my pneumatics, but I've had good results using the PC nonetheless. It does tend to be a bit slower than my pneumatics.

    Without having hands on your machine and seeing the way it acts, I'm not able to say anything more certain. I'm sure others will once they see the thread.
    See the big picture, enjoy the details

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    my G100 does the same thing. I have gone so far as to actually do the tip that MIke shows about practicing pressure on a scale w/ clear plastic wrap over it. MIne too bogs down while using 5.0 setting w/8006 when I apply 15-20 pounds pressure. I have a black vertical line marked on the outer edge of my pads so I can see the rotation. It simply quits moving at all very often.....I used it last Saturday and as I see my paint more and more in the light, I'm finding that I got out very few of the scratches I was trying to get. Paint looks good straight on but get at an angle and they are THERE!!!! Very frustrating too me.

  9. #9
    Registered Member Monk's Avatar
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    Pete--6 ft extension cord. Yes it gets hot--I can feel it right into the backing plate when I change pads.

    I have nothing to compare it against.

    LA--Same result/frustration here. Very superficial top buffing only. I can barely keep the rotation going to remove my wax application (NXT) with a 7006/bonnet.

  10. #10
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    Monk I see that you are in FL. What part and are you going to the Tampa class? I am seriously thinking about making the drive and coming down to it. I will have to figure out drive time and decide when to leave, come home, accomodations, ect.....I have been wanting to attend a class and it looks as if this may be the closest one I will ever have opportunity to attend.

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