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Old 12-21-2009, 01:25 AM   #11
Deanofid
 
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Default Re: Trying out metric

Metric? Have fun with it, Potman.
It's just for folks who don't know their fractions, you know...
(nudge, nudge, wink, wink.)

Dean


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Old 12-21-2009, 01:58 AM   #12
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Default Re: Trying out metric

Quote:
Originally Posted by ironman
Is that magic number .03037 or .03937? I just ate dinner and my brain isn't on the ball for thinking right now?
.03937


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Old 12-21-2009, 05:26 PM   #13
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Default Re: Trying out metric

[pedant]

Actually, the magic number is 25.4, exactly. The inch is *defined* as 25.4 mm. Yes, that's right, the inch is defined in terms of the metric system. (As are many of the other basic units in the Imperial idiocy.)

1/25.4 = 0.039370078... is an irrational number. That means that the decimal representation goes on forever whereas the 25.4 representation is exact since that's how the inch is defined.

[/pedant]

Clearly, if one is simply estimating, none of this matters - calling a millimeter forty thousandths is good enough. However, if using a calculator, it's less keying to divide by 25.4 than to multiply by 0.03937. Further, most people seem to have less difficulty remembering 25.4.
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Old 12-21-2009, 06:14 PM   #14
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Default Re: Trying out metric

i work in both metric and imperial!

i run CNC's, some are programed in metric and some imperial!

altering an offset to take thou off, is either 0.001 or 0.025! it can make it an interesting night when you are running one of each


wheights still catch me out though, in England its all metric, doing the shopping online i've bought a Kilo of mushrooms (thats a LOT!), pounds and ounces makes sense, but Kilos..............................
 
 
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Old 12-21-2009, 06:22 PM   #15
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Default Re: Trying out metric

Quote:
in England its all metric
Come again?

Pints of beer, stones on the bathroom scale, and, IIRC, miles on distance markers?

Do you still use that hundredweight (cwt) that weighs 112 pounds?
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Old 12-21-2009, 07:15 PM   #16
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Default Re: Trying out metric

CNC runs in both. Just set G20 or G21 Right? I like metric. Too bad it's hard to find good metric lathes in the US at a hobbyist price.
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Old 12-21-2009, 07:33 PM   #17
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Default Re: Trying out metric


Being ignorant about such things....
What makes a lathe "metric"

Is it just the gearing for the screw thread, and
the calibration on the handwheels?

Or is there more to it ?

earl...
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Old 12-21-2009, 07:41 PM   #18
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Default Re: Trying out metric

Quote:
Originally Posted by potman

Is it just the gearing for the screw thread, and
the calibration on the handwheels?

Or is there more to it ?

earl...
Isn't it enough? Working with fractions to me .........
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Old 12-21-2009, 08:56 PM   #19
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Default Re: Trying out metric

Yes, metric leadscrews and dials on the ways and a metric threading lead screw. I work in inches while turning parts no problem, but threading is not so simple. I have to come up with some change gears. I do have a small CNC mill and just received a thread mill. I'm going to try thread milling in the mill.
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Old 12-22-2009, 03:45 AM   #20
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Default Re: Trying out metric

Quote:
Originally Posted by mklotz

Do you still use that hundredweight (cwt) that weighs 112 pounds?
Talk about getting your moneys' worth. 'Course, that would make me even fatter than I already am..



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