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Author Topic: Question on grit progression  (Read 4413 times)

duvallite

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Question on grit progression
« on: December 07, 2010, 10:30:11 AM »
I want to try this surface finish out using my spinner, but I'm not sure what it means or how to do it when grits are repeated, like in this example:

"I had mine pin over bridge, cg kicked right a bit. Took my surface to 500/500/4000/4000 and it was a house shot beast".

How is this different from just doing a single round of 500/4000 at 15sec/40sec each?

 

ldkelleyb5

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Re: Question on grit progression
« Reply #1 on: December 11, 2010, 11:04:05 PM »
I'd like to know this as well.  I've searched and not seen this discussed elsewhere, but I'm seeing Ebonite now showing info like this:

Factory Finish: 800 Abranet, 1000, 2000, 2000 Grit Abralon

Just not sure what it means.

Thanks for any help anyone can give.

vilecanards

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Re: Question on grit progression
« Reply #2 on: December 12, 2010, 12:32:30 AM »
me too...
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Life is not a matter of holding a good hand, but of playing a bad hand well. (R. L. Stevenson)

jensm

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Re: Question on grit progression
« Reply #3 on: December 12, 2010, 01:14:16 AM »
I don't remember where I got the text below, but I have found it useful:

"Here are a few useful combinations:
500-grit This reaction causes the ball to read extremely early. This usually on works well on extremely heavy patterns or very direct angles
by speed dominate players.
360, 1000-grit This reaction gives the ball more length than 500 alone, but still has a significant ability to generate friction in heavier oil. This works
well on heavy patterns with fresh back-ends.
500, 2000-grit This reaction is a very good benchmark reaction as the ball has enough topography to still generate friction in medium to light oil,
but not enough to cause the ball to read too early in most cases. This finish delays the hook transition, allowing for a strong entry
angle.
500, 4000-grit This reaction works extremely well on multiple patterns, giving the ball easy length through the heads, a subtle but noticeable midlane
reaction, and an enormous amount of friction at the end of the pattern. This finish can generate some of the strongest entry
angles possible on fresh patterns, but may start to skid too far as the pattern carries downlane.
Of course, there are multiple methods, resurfacing mediums, and grits available on the market, all of which will yield slightly different results causing
a ball to read earlier or later, with more or less on the back-ends.
As a final recommendation, whenever making surface adjustments, our research has shown that the lowest grit should be applied with more
pressure, but for a shorter duration. The higher grits should be applied with less pressure, but for a longer time. This will have the desired effect of
creating strong surface deviations to displace oil, but will also round the edges, peaks, and valleys enough to get the desired amount of skid."

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Regards,

jensm
Regards,

jensm

Aloarjr810

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Re: Question on grit progression
« Reply #4 on: December 12, 2010, 03:59:35 AM »
500/500/4000/4000 on a spinner would be like this. Put the ball on the spinner and keep the finger and thumb hole on top. sand the ball with 500 flip over 180 degrees sand again. Now place the finger holes so they are pointing at your stomach sand the ball with 500 then flip 180 sand again. Then repeat this with the 4000.
With the right pressure this would give you a crosshatch pattern.
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Edited on 12/12/2010 5:32 AM
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ldkelleyb5

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Re: Question on grit progression
« Reply #5 on: December 12, 2010, 11:18:49 AM »
Isn't this just the standard 4-sided process?

quote:
500/500/4000/4000 on a spinner would be like this. Put the ball on the spinner and keep the finger and thumb hole on top. sand the ball with 500 flip over 180 degrees sand again. Now place the finger holes so they are pointing at your stomach sand the ball with 500 then flip 180 sand again. Then repeat this with the 4000.
With the right pressure this would give you a crosshatch pattern.
--------------------
Aloarjr810
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Click For My Grip

Edited on 12/12/2010 5:32 AM

Aloarjr810

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Re: Question on grit progression
« Reply #6 on: December 12, 2010, 12:06:51 PM »
quote:
Isn''t this just the standard 4-sided process?


In the standard process you''d also do all the in between grits also.

here they start at 500 then skip the in between grits and go straight to 4000.

Now if done right using a spinner this will give you a crosshatch pattern. like this# which would be closer to the random pattern a Haus or similar machine would leave on a ball.Like they come from the factory.

Now that''s how I''ve heard it. I''m sure there''s other opinions on what it means.

Edited on 12/12/2010 1:10 PM
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ldkelleyb5

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Re: Question on grit progression
« Reply #7 on: December 12, 2010, 12:25:42 PM »
Sorry, no, I meant that what you describe is the standard 4-sided process, so 4 sides at 500, then 4 sides at 4000.  At least, that's always been my understanding - that each step was a 4-sided process.

With the OPs question, there is a second 500 and a second 4000.  Or, in my case, it starts at 800 Abranet, then 1000 (something), another 1000 (something), then 2000 Abralon.

duvallite

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Re: Question on grit progression
« Reply #8 on: December 12, 2010, 05:51:39 PM »
Asked about this over on BBE, and was told that for a 500/500/4000/4000 finish, you would do it like this:

1.  500 on 4 sides
2.  Repeat again with 500 on 4 sides
3.  4000 on 4 sides
4.  Repeat again with 4000 on 4 sides

I was told that there is a BIG difference between finishing a ball at 500/4000
and finishing a ball at 500/500/4000/4000.  Haven't tried it out yet, but will
pretty soon.

Anybody know what kind of reaction difference this would probably produce?


ldkelleyb5

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Re: Question on grit progression
« Reply #9 on: December 12, 2010, 11:03:58 PM »
OK, good to know.  I assume the results would be different than if you just double the times, ie, using the times from your original post of 15 at 500 and 40 at 4000.....doing a second pass on each step is different than doing 30 seconds at 500 and 80 seconds at 4000, right?

Also - any idea what 800 Abranet/1000/1000/2000 Abralon means?  Obviously the first stage is 800 Abranet and the last is 2000 Abralan, but are the 2 1000 steps Abralon also?  Just not clear on this......

Edited on 12/13/2010 0:05 AM