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 Post subject: Ra vs grit vs amount of oil
 Posted: Sun Dec 24, 2017 2:57 am Post Number: #1 Post
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Don't quite know how to read these 2 charts. Appreciate help.

http://wiki.bowlingchat.net/wiki/index.php?title=Ra_Grit_Comparison

http://wiki.bowlingchat.net/wiki/index.php?title=Ra_to_Unit_Depth_Comparison

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(Sep 2018)
PAP: 5 1/8 up 3/4
Speed: 15.5 mph (Kegel Specto)
Rev: 350 RPM
Axis tilt: 18-20*
Axis rotation: 60*


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PAP: 5 5/8 up 3/4
Speed: 14 mph off hand
Rev: 300 RPM
Axis tilt: 15*
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 Post subject: Re: Ra vs grit vs amount of oil
 Posted: Sun Dec 24, 2017 3:23 am Post Number: #2 Post
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ads wrote:


Ra_Grit_Comparison
RA is how deep the microscopic peaks and valleys are.
The bottom of the chart is the grit of your abrasives like Abralon, scotchbrites etc
The scale on the left is the depth/height (RA) of the grit.
The red dots show the RA of that particular grit and how it compares to the others. example: 180 grit has a RA of 118.32


Ra_to_Unit_Depth_Comparison
I believe This is comparing the RA of the grit to the thickness of oil (in Units) on the lane example: 180 grit is equal to about 80 units.

I'm guessing those charts are used in a article, which would explain more. But I don't know which one right off hand.

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