wet vs dry is easy but the grit thing 980 vs 220 vs 400 is there any technical reason for those numbers?
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size of the grit...
larger the number... finer the grit...
http://en.wikipedia.org/wiki/Sandpaper
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming
WOW!!! What a Ride!
Forget the primal scream, just ROAR!!!
I don't think this is the exact reason, but I think of it as the number of grains they can fit in a square inch.
micrometer measurements of the grains or the grains that fit thru that size sieve...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!
Forget the primal scream, just ROAR!!!
"Some days it's just not worth chewing through the restraints"
From Woodworking For Industry, by John L. Feirer: 1963
"Abrasives used in sandpaper originally come in chunks which are mechanically crushed.
The broken particles are then sifted into certain grit sizes by passing them over a series of very accurately woven silk screens. The mesh of these screens (or number of openings per inch) ranges from very fine to very course.
Mesh numbers are used to designate grit sizes. For example, grits that pass through a screen with 80 openings per linear inch are called grit size 80. The more openings per inch in a mesh, the smaller the opening. Therefore, grit sizes get finer as the number goes up. "
Cool
thanks guys!
the old... i'm just ask'n this for my grandkid......
p:)
No really
they are all into intendo and power rangers etc etc. where will they learn about mechanical things???
<g> my little girl... now 11 use to would climb a 40ft ladder and spend the day on a roof with me... loves the motorcycles and the jetskis and her 4 wheeler... she's not as interested as she once was... but before she rides It's my deal that she understand how it works... why it goes... why it stops... ect...
my 5yo boy... is already past "play plastic tools" has had his own 18v cordless drill since he was 4... he's real good at take'n stuff apart...... every box becomes a car or boat or plane... i bring him home 1x wood scrap... 1x4...1x6 1x8... i gang cut em... 6 & 12" long... he has a ball building stuff with em...
BUT he always tells people "all my daddy gives him is old scrap wood to play with"
he can spend hours painting the scraps and stack'n em
when he goes to work with me... I do my best to answer every question... and there are MANY... but he always remembers what each tool is and why we do things the way we do.....
p
Maybe it's all relative now. Like an 80 compression golf ball versus a 100 compression ball. What? Or the Spinal Tap amplifier that could go up to 11. May have no real significance. What does a 140 tire tread life figure mean? Maybe better than a 100, but how does one translate that into real life? I just rated my own alarm clock at 175 -- eat your hearts out guys.
what ever those numbers are for ...
my current box van sports some added handles at the back door.
2 pieces of 2x2, sanded smooth and screwed to the rails to help ya climb up in.
my boy is now 7 ... 2 and a half years ago when I first got it ... he "helped" me build the shelves in the back. One of his most important jobs ... sand those two sticks smooth.
I made him sand ... and sand ... and sand.
ask him ... he'll still tell ya!
he'll also point them out each and every time he see's the back door open.
picking up a new truck this weekend, and that one will be sold by spring.
not sure yet if it'll be sold with out those fancy extra handles ...
or if I'll find something new to add to the new truck for him to work on.
no matter what the grit ... get the kids out there and make them sand for real.
matter of fact ... the very first screw he drove for real ... all by himself ...
is in the back of that truck. It's circled in sharpie and marked as such!
Jeff
Buck Construction
Artistry In Carpentry
Pittsburgh Pa
Some day somebody will buy a van with "Corey's first screw" written in the back....You GOTTA in stall Shag carpet before you sell it!!!.
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"After the laws of Physics, everything else is opinion" -Neil deGrasse Tyson
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If Pasta and Antipasta meet is it the end of the Universe???
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according to statistical analysis, "for some time now, bears apparently have been going to the bathroom in the woods."