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General Category => Coverstock Preparation => Topic started by: Grayson on May 28, 2008, 12:03:26 AM

Title: Grit to Âµm
Post by: Grayson on May 28, 2008, 12:03:26 AM: I am searching for certain ways to resurface bowling balls... and one is special material. But the particle size is given in Âµm (micrometer) and I wanted to know if maybe somwone here knows how GRIT and Âµm are transfered into each other?

Thanks for any help.
--------------------
Sebastian Koch
"Have fun and bowl well!" - Grayson
"Some things are made so even idiots won''t fail using them.... But I ask what about the genius?" - Grayson

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Title: Re: Grit to Âµm
Post by: dizzyfugu on May 28, 2008, 09:10:56 AM: You might laugh, but the info is in the FAQ section you have in your sig!

TRIZACT GRIT CHART (Courtesy of Charlest)
A long while back when this confusion first arose I sent an email query to 3M who invented Trizact and manufactures it. This is their answer:

To extrapolate the micron to grit conversion from 3M:
A35 ~ 35 micron ~ 360 grit,
A10 ~ 10 micron ~ 1100 grit
A5 ~ 5 micron ~ 1600 grit

Trizact and micron(u) grading are two separate things. Trizact products
are graded on their own scale ranging from A6 - A160.
3M Superabrasives are micron graded, that is, measuring the average size
of an individual particle on that product.
Standard abrasive grading is based on the screen mesh used to separate
out the particles for a particle grade. In simplest terms, in a 1"
line of grade 24 product there are ~24 particles. In a 1" line of
grade 600 product there are ~600 particles.
In comparison, 9u=1200 grit, 15u=600, 20u=500, 30u=400, 40u=320
--------------------
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Title: Re: Grit to Âµm
Post by: charlest on May 28, 2008, 10:20:25 AM: Grayson,

Here are some charts I've encountered in my internet travels:

http://www.taunton.com/finewoodworking/pages/w00006_sb2.asp
http://www.alliedhightech.com/polishing/waterprfabr/
http://www.mirka-usa.com/downloads/pdf_files/grit_chart.pdf
http://www.buffpolishgrind.com/pdf/gritcomps.pdf
--------------------
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Title: Re: Grit to Âµm
Post by: BeansProShop on May 28, 2008, 09:44:05 PM: Great informative post. Wish we had more like this!!!!

beans
--------------------
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--------------------
Thomas "Beans" Biniek Jr.
PBA Member and Lane#1 Ball Drilling Expert
Thanks for reading and be sure to check us out at the Lane#1 booth in Albuquerque. Check out current eBay auctions at:
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Title: Re: Grit to Âµm
Post by: Aloarjr810 on May 28, 2008, 10:32:24 PM: Click for bowling_grit_chart.pdf (http://"http://home.earthlink.net/~litefrozen/downloads/bowling_grit_chart.pdf")
Title: Re: Grit to Âµm
Post by: BeansProShop on May 28, 2008, 10:47:14 PM: I didn't mean posts on this topic. I meant in general.

beans
--------------------
www.beansproshop.com
--------------------
Thomas "Beans" Biniek Jr.
PBA Member and Lane#1 Ball Drilling Expert
Thanks for reading and be sure to check us out at the Lane#1 booth in Albuquerque. Check out current eBay auctions at:
http://cgi6.ebay.com/ws/eBayISAPI.dll?ViewSellersOtherItems&userid=bowling_with_leah
Official Pro Shop of "ALL" F.O.S. Members!!!
Title: Re: Grit to Âµm
Post by: Grayson on May 29, 2008, 01:21:15 AM: Thanks folks!

yeah... I also found out 1/2 hour after I asked that
"micron" = Mikrometer in German

LOL 4 everyone on my cost !!!
--------------------
Sebastian Koch
"Have fun and bowl well!" - Grayson
"Some things are made so even idiots won't fail using them.... But I ask what about the genius?" - Grayson

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Edited on 5/29/2008 1:22 AM