[time-nuts] metric / English

Don Couch couchclocks at yahoo.com
Sat Dec 17 05:05:14 UTC 2011


Hi, Brooke,

To cut metric threads on an inch machine, I mesh the 127 tooth gear with the 100 tooth gear that came with my Sherline lathe threading attachment. Works great.

Don Couch

--- On Fri, 12/16/11, Brooke Clarke <brooke at pacific.net> wrote:

> From: Brooke Clarke <brooke at pacific.net>
> Subject: Re: [time-nuts] metric / English
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Date: Friday, December 16, 2011, 9:48 AM
> 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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> 
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