Myfordman":2p5mblhk said:As far as precision squares are concerned you would be better off buying an engineers square and keeping in a decent box to calibrate other everyday squares with.
Four 90° angles, all faces square to all edges
Stainless steel blade triple riveted for permanent accuracy
Finely ground and with polished finish
Conforms to DIN875/II, guaranteed square and straight
Notch on inside corner aids accuracy of reading
Supplied in a foam lined case
transatlantic":2vsz34xq said:they seem fairly cheap.
Nelsun":miw67kpb said:This PDF lists the various DIN 875 tolerances with 2 (guessing that to be "II" in Axminster parlance) being the least accurate:
I'll put my hands up to not knowing exactly what the "Maximum variation (angle) µm" measurement equates to in real life. Anyone able to enlighten me?
Between 10 μm and 100 μm
10 to 55 μm – width of wool fibre
17 to 171 μm – diameter of human hair
70 to 180 μm – thickness of paper
JohnPW":2tph0teh said:Nelsun":2tph0teh said:This PDF lists the various DIN 875 tolerances with 2 (guessing that to be "II" in Axminster parlance) being the least accurate:
I'll put my hands up to not knowing exactly what the "Maximum variation (angle) µm" measurement equates to in real life. Anyone able to enlighten me?
µm is micrometre/micron, there's 1,000 µm in 1 mm.
The 100mm DIN 875/2 square is within 30µm,
30µm = 0.03mm (30/1,000), or 3 hundredth of 1 mm
Between 10 μm and 100 μm
10 to 55 μm – width of wool fibre
17 to 171 μm – diameter of human hair
70 to 180 μm – thickness of paper
I've answered my own question, it may be class 1 buy when I viewed it at my local toolstation it had silverline branded on it. Said no ta asap.Estoril-5":5n8ow29l said:What baffles me is you can get a Class I square for half the price of the Axi Class II, see below (both same size)
http://www.toolstation.com/shop/Hand+To ... are/p23063
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