As for pattern length in general less than 36 feet is considered a short pattern, 37-42 feet is considered a medium length pattern, more than 43 feet is a long pattern.
In terms of volume there's not really a set scale, because it's not how much, but where it's at on the lane.
You might read this article:
"Lane Pattern Basics: An Overview of Blend, Taper & Application".
Click here for the article
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But here's a basic scale: Light to Medium (20ml. or less), Medium to Heavy (More than 20ml. (other references will vary this)
The volume of oil will give you a idea of the strength of ball, what surface you will want to use and about how fast you can expect the oil to break down.
Basically the higher volume of oil the more aggressive ball and/or a rougher surface.
A general guideline from Kegel is:
Less than 18 ml use a weaker cover ball
18 - 21 ml use a weak to medium cover
21 - 25 ml use a medium to strong cover
More than 25 ml use an aggressive coverstock
Patterns with lower volume will break down more quickly, patterns with higher volume tend to break down more slowly. Also the lane type and where the oil is applied will affect how the ball reacts
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