[time-nuts] metric / English
CollinG at navcanada.ca
Fri Dec 16 12:30:40 EST 2011
Some time ago I was setting up to turn a Metric and discovered that there where a Japanese Metric standard for the thread as well as a German Metric standard both of which where slightly different from the "standard" Metric threadd that was I wanted to cut.
Cheers, Graham ve3gtc
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Brooke Clarke
Sent: December 16, 2011 11:49
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] metric / English
Sure converting lengths is easy and I have metric, English and weird taps and dies, but how do you turn metric threads?
Don Couch wrote:
> The idea that conversion to metric would require replacing all of the machine tools (lathes, mills, etc) is a myth. Any U.S. machine shop has walls and toolboxes covered in conversion charts, converting drill, screw, wire, sheet sizes from one crazy measurement to another. One single additonal conversion chart, inch to metric, and you can keep using your inch machines on metric projects.
> My mill has inch lead screws. I added a low cost digital readout with a little button to show inch or millimeter movements, and now I do everything in metric. No problem.
> Don Couch
> --- On Thu, 12/15/11, Dan Kemppainen<dan at irtelemetrics.com> wrote:
>> From: Dan Kemppainen<dan at irtelemetrics.com>
>> Subject: Re: [time-nuts] time-nuts Digest, Vol 89, Issue 51
>> To: time-nuts at febo.com
>> Date: Thursday, December 15, 2011, 10:29 AM
>> On 12/14/2011 3:59 PM, time-nuts-request at febo.com
>>> It's not like metric is totally absent. We drink
>> 2 liter cokes and defend
>>> ourselves with 9mm pistols. Our cars
>> use mostly metric parts. Even ham
>>> radio operators, arguably the most jingoistic and set
>> in the past bunch
>>> around, get on the 80, 40, and 20 METER bands.
>> I agree with you, and funnily enough the rest of the NATO
>> world uses 7.62mm and 5.56mm rifles. (Both were originally
>> based on standard inch sized rifle cartridges designed in
>> the US)
>> The problem in converting to metric would require replacing
>> a lot of tools. For example Mills, lathes, and other
>> machining tools and measurement devices are expensive, and
>> last for decades. I doubt many of the small tool shops
>> around here could afford it.It's a great idea to standardize
>> in theory, but in practice it becomes difficult. Maybe the
>> whole world should standardize our language. We could all
>> switch to Spanish or Latin or Chinese to speak with so we
>> could all talk with each other. That would probably be more
>> helpful to me on a daily basis, than having to switch
>> measurement systems.
>> While we're on the subject, let me throw time back into the
>> mix. We use months and days for scheduling projects.
>> Meanwhile some of our counterparts use calendar weeks. This
>> is much more difficult to convert between than inch and mm.
>> When is CW 36???
>> There I threw some wood on the fire too!
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