ManSpace Issue 3

Issue 3 (otherwise known as Issue 1, 2012) of ManSpace is out now.  Still a massive $6.95, or $5 for subscribers.  An interesting effect on the cover with selective varnishing to highlight details in the images and text.

I have a couple of articles in the current issue: (there are obviously a lot more articles for you to read from other contributors!) A third article has been held over till next time – there was so much content for the current one there just wasn’t the space!

Circle Work: Professing my dislike of a popular power tool, and demonstrating 6 different ways I cut circles in the workshop (excluding handtools, and drilling holes!), whether that be cutting a round disc, or cutting a round hole.

True Grit: which looks at the whole question of abrasives and just how they fit together – sandpaper, waterstones, diamond paste etc – they are all abrasive, and we know to work through the grits but what happens if you don’t have ten different grades of diamond stone?  To complement the article, the following table is what I use to compare abrasive systems.  I have taken a few minor liberties with the numbers, but then no table I have seen seems to totally agree with another anyway.  The other thing you will notice is my table is the only one I have found that places diamond stones in their correct location, and I’ve included some common items to give an idea just how fine some abrasives are.

			Waterstones
Description	CAMI (USA)	ISO/FEPA (Europe)	JIS (Japan)	Mesh	Average functional particle size in microns (µm)
		P20		18	1000 (1mm)
Beach Sand				28	700
	40	P40			425
		P60			269
Fine Sand				60	250
		P80			201
	80				190
		P100			162
				100	150
	100				140
		P120		120	125
	120				115
		P150			100 (0.1mm)
	180	P180			82
Portland Cement				200	74
	220	P220			68
		P240			59
		P280/F230			52
		P320			46
Silt				325	44
		P360			41
120 µm Diamond Whetstone Extra-Extra Coarse					40
Plant Pollen				400	37
	320	F280	360		36
		P400			35
			400		32
	400	F360			23
		P800	600		22
60 µm Diamond Whetstone Extra Coarse	500				20
		P1000			18
	600		800		16
45 µm Diamond Whetstone Coarse		P1200			15
			1000		14
	800	P1500			13
Red Blood Cell				(1200)	12
			1200		11
	1000	P2000			10 (0.001mm)
25 µm Diamond Whetstone Fine		P2500	2000		8
9 µm Diamond Whetstone Extra Fine		F1200	4000		3
Cigarette smoke		F1500	6000	(4800)	2
3 µm Diamond Whetstone Extra-Extra Fine		F2000	8000		1 (0.0001mm)

P – Coated abrasives
F – Bonded abrasives

Related articles

• Natural Abrasives (egrejeen.wordpress.com)
• The Festool Surfix Oiler System, (Part 2) (tutorwood.wordpress.com)
• Why “But We Walked On the Moon!” Doesn’t Mean What They Think It Does [Casaubon’s Book] (scienceblogs.com)