whats the difference

[CrazyBear]

Another MM question

What is the difference between MM and wet and dry sandpaper. I use W&D up to 1500grit. Now I know that MM goes up to 12000 grit but I believe there is a comparison chart.

Where on MM grading would the W&D 1500 grit fall.

Sorry if it seems like a stupid question but us canny scotts hate spending money needlessly

 

[ctwxlvr]

W/D 1500 = MM 4000, but my experience is that MM will last almost forever if cleaned and taken care of (don't melt it) where W/D clogs up after a few uses max.

MM 1500 is some where around 400 grit on a standard paper, and MM 12000 is around 2500 on standard paper(I think).

here is a link to the charts:

http://www.penturners.org/forum/topic.asp?TOPIC_ID=22645

 

[arioux]

Hi,

Here:
http://www.fine-tools.com/G10019.htm

Alfred

 

[CrazyBear]

Thanks guys.. Those links help

 

[RussFairfield]

Beware of conversion charts for the different abrasive mediums. They don't tell the whole story. There is a difference in the shape of the particle, how the medium is manufactured, and the allowable deviation from the specified grit size. Micro-Mesh is made by a process that puts a more uniform distribution of particle sizes on the sheet, and this leaves a more uniform scratch pattern on the surface.

 

[ctwxlvr]

I have to agree with Russ, not all sand paper is created equal, I know a lot of "400" grit feels more like 80 grit and leaves just as deep of a scratch than other brands sheck out your paper supplier and get the best you can afford, MM is one of the better polishing papers around.

 

[Randy_]

I'm surprised that no one has commented on this. Go back and take a look at the charts provided by Alfred and Tracy and you will notice that the correlations between ANSI and MM sizes are different on the two charts. I wonder which one we are to believe.....maybe neither??