[time-nuts] metric / English

J. Forster jfor at quikus.com
Fri Dec 16 13:33:59 EST 2011


You use the change gears in a ratio of 127:50 (254:100)

-John

==============


> Hi Don:
>
> Sure converting lengths is easy and I have metric, English and weird taps
> and dies, but how do you turn metric threads?
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
> http://www.end2partygovernment.com/Brooke4Congress.html
>
>
> 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
>>> wrote:
>>>> 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!
>>>
>>> Dan
>>>
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