BallReviews
General Category => Coverstock Preparation => Topic started by: lefty50 on August 08, 2014, 09:27:37 PM
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I was told something last week that is difficult to believe...
What is the net effect of using two different grits simultaneously on a ball with a spinner?
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Steve,
What did the person who told you about this "method" say it would do?
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You've got mail.
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So what does it accomplish?
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I am guessing it's top secret since it's not being posted?
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Please go ahead and tell them what was told to you and why. I think it's worth while to let them know how some people think.
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Sorry. No intent for secrecy, but you never know who's on the boards.. sometimes it's better just to find the real answer...
Bottom line, I was told that using a 500 and a 1000 pad together gave a 1500 net surface... that can't possibly be right under any rationale I can think of. If anything, it would be between the two extremes.
Thoughts?
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"500 and a 1000 pad together gave a 1500 net surface"
That's too funny! ;D
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"500 and a 1000 pad together gave a 1500 net surface"
That's too funny! ;D
Not to someone who doesn't know. This is how ignorance gets perpetuated.
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If anything, it would be between the two extremes.
Thoughts?
The main thing would be that one part of the ball would be different than the other.
Say you set the ball on the spinner and it spins counterclockwise.
You hold the 500 pad in your left hand and You hold the 1000 pad in your right hand.
You spin the ball, sand and stop.
The side closest to you would be about 500, because it came off the 500 pad last.
The side farther from you would be about a 500/1000 surface, because it came off the 1000 pad last.
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WOW!!!!! Is all I can say. And these people work on customers equipment. Are we sure a 500 and 1000 give 1500 and not 750? So by the info here, a 1000 grit in each hand would be a 2000 final finish. They must be multiplying by pi squared.
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Well if we were doing addition then yes I gess that is correct.
I like having a visual to better describe the idea. When using 500 grit you have large peaks and valleys created by the course grit. Coming over top with 1000 or 2000 smoothes out the top/peaks but you still have the underlying valleys.
I regularly use 360/1000, or 500/1000, or 500/2000 and they are nothing like having 1360grit, 1500, or 2500 grit.
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Agreed. There's no way this can be an additive process. I really didn't know how to respond when I heard it.... It was just HUH?
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Just smile and wave.
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Maybe you should ask, "If I cut a 1000 grit pad in half, does that make it a 500?" ;D
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To add to this I don't think you can correct surfaces using a spinner vs. a Haus machine. rpm's are way higher on a spinner vs. Haus.
I could see starting at 360 via spinner to take out tracking etc when resurfacing/de-oiling. But subsequent layers should be done by hand to better replicate a surface IMO. I'd like to see a scanner result of spinner vs. by hand.
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No way I personally would do that by hand. Using a spinner and covering 6 sides with each grit as I go up looks really good when finished. It looks as close to a factory finish as I have seen.
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I've never heard of this. Seems like a waste to me.