A useful Imperial/metric conversion table - Router Forums
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post #1 of 31 (permalink) Old 08-25-2017, 07:49 AM Thread Starter
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Default A useful Imperial/metric conversion table

This is a very useful table.
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post #2 of 31 (permalink) Old 08-25-2017, 09:23 AM
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I recently bought a one meter rule marked in both metric and imperial. The problem for me hasn't been measuring, but being able to visualize the actuall size of something 600 mm long. I also have a metric/imperial tape measure, which helps. But for the most part, I work and think in imperial--must be old guy ridgidity.

The more I do, the less I accomplish.
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post #3 of 31 (permalink) Old 08-25-2017, 11:14 AM
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I recommend against those using hybrids. You are asking for errors using them. You can't accurately measure from one side to the other and sometimes you have no choice but to read one way from one side and the other way from the other side which gives one measure in Imperial and the other in metric. I have maybe a half dozen tapes in all Imperial, 2 more that are only metric, several rules that are all Imperial, and a couple that are all metric. The metric rules are all brass, 1 metre long, and were used in the fabric industry for measuring cloth.

The worst thing to do is to convert from one to the other. Either work in Imperial or work in metric but converting back and forth doesn't work well.
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post #4 of 31 (permalink) Old 08-25-2017, 12:55 PM
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Amen, Charles!!! Sooner or later you'll regret doing a conversion.
Having said that, it's handy to be able to figure out when you're in the ballpark; something calls for a 19mm whatzit and the chart lets your fading memory know they're talking 3/4". (Who remembers this stuff?! )
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post #5 of 31 (permalink) Old 08-25-2017, 01:52 PM
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I continue to be of the opinion that the USA should have made the change to metric years ago. Now we are still stuck with a fractured system that use both but primarily imperial. I have both types of measuring devices and use both from time to time but not at the same time. I have found a converter app called Units Plus to be very handy as it converts lots of things. As Charles said use only one system at a time. Trying to switch back and forth on a project is sure to invite a mistake.
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post #6 of 31 (permalink) Old 08-25-2017, 04:01 PM
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Richard a lot of people in the US may not realize it but almost all international trade is already in metric. US made products cannot be sold in Canada for example unless they have the metric measure on them. It's the law here and I suspect that that holds true for many other countries. I can't remember if it was under Carter or Reagan when the change was considered but if I remember correctly the reason not to was because it was going to cost so much to recalibrate scales and meters to read metric. It was an unfortunate decision because the change is inevitable and the cost just keeps going up over time.
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post #7 of 31 (permalink) Old 08-25-2017, 04:03 PM
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Quote:
Originally Posted by DesertRatTom View Post
But for the most part, I work and think in imperial--must be old guy ridgidity.
Way I see it, you use what you grew up using. And I'm way too old to change something like that. Inches all the way for me, and my woodworking.

However, best to keep an open mind, at times it is a definite advantage to using metric.
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post #8 of 31 (permalink) Old 08-25-2017, 06:11 PM
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Exactly, Theo! In spades!!


I've never been able to get used to our metric week and clocks though...
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post #9 of 31 (permalink) Old 08-25-2017, 07:28 PM
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For those of you have joined later, several year ago @harrysin started a thread entitled "The Utter Stupidity of the Imperial System". Those who followed that thread know where I stand, and have stood for over a half century. Briefly, among other things, I find it frustrating that things such as router bits and wood, plastics, etc. are described in Imperial units.

Quote:
Originally Posted by Cherryville Chuck View Post
Richard a lot of people in the US may not realize it but almost all international trade is already in metric. US made products cannot be sold in Canada for example unless they have the metric measure on them. It's the law here and I suspect that that holds true for many other countries. I can't remember if it was under Carter or Reagan when the change was considered but if I remember correctly the reason not to was because it was going to cost so much to recalibrate scales and meters to read metric. It was an unfortunate decision because the change is inevitable and the cost just keeps going up over time.
I also know the history of efforts to get the US to make the change. @Cherryville Chuck , as with many things, President Carter started or promoted many modernization and globalization efforts that President Reagan stopped. The conversion of the US to everyday use of the metric system. The US Imperial system measurement standards are in fact defined in metric system units.

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post #10 of 31 (permalink) Old 08-25-2017, 09:28 PM
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Geez, I hope we're not opening that can of worms again.
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