[Jewelry making - Article 00588] - Re: [Orchid] FYI conversion chart for Gauge - Inch - Millimeter

[jesse brennan]

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>	Conversion Chart for
>	Gauge  -   	Inch    -  		Millimeter (rounded     to second decimal)
>
>	29          		.013"      		0.33 mm
>	28         		.014"      		0.36 mm
>	27     			.016"      		0.40 mm
>	26     			.018"      		0.46 mm
>	25     			.020"      		0.51 mm
>	24     			.022"      		0.56 mm
>	23     			.025"      		0.64 mm
>	22     			.028"      		0.71 mm
>	21    			.030"    		0.76 mm
>	21          		.032"     		0.81 mm
>	20         		.0355"    		0.90 mm
>	19          		.042"     		1.07 mm
>	18         		.050"      		1.27 mm
>	17     			.058"      		1.47 mm
>	16         		.065"      		1.65 mm
>	15         		.072"      		1.83 mm
>	14         		.083"      		2.11 mm
>	13         		.095"      		2.41 mm
>	12   			.100"     		2.54 mm
>	12         		.109"      		2.77 mm
>	11	         		.120"      		3.05 mm
>	10     			.134"      		3.40 mm


    This chart does not check out with others--- Hoover and Strong,
    McCreight, Rio Grande. The US uses the Brown and Sharp system and I
    Believe most everyone else uses  metric  measurements. A few sizes
    conflicted with memory.. then they don't seem to really check out ..
    This chart seems to be for  the Birmingham  iron wire measuring
    system.   There are at least 8 wire gage systems and several systems
    for sheet metal that are  all a bit different.   Even the old
    Machinery's handbook 1966 edition recognized the problem and
    recommended using decimal measurements when specifying material. The
    old stuff hangs on in some industries with a resulting need to
    always  check  things out when just a gage number is specified. jesse


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