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From: jmfbahciv on 12 Feb 2010 09:01
Andrew Usher wrote:
> Bob Myers wrote:
>
>>> Drills already have interchangeable bits,
>> Ah, another person who's never seen the inside of
>> a machine shop...
>
> OK, perhaps I didn't use the right terminology; I used that which I am
> familiar. Nevertheless, my point stands that you don't normally need a
> different machine for each different size of drilling.

Now ask the question why that is so.

/BAH
From: jmfbahciv on 12 Feb 2010 09:02
Andrew Usher wrote:
> Darwin123 wrote:
>
>>> The truth is, the leftist machine has gotten people's minds to feel
>>> sorry for our measuring system, just like they've gotten white men to
>>> feel sorry for being white and male.
>> Your metaphors are gang raping the English language.
>
> My assertion is not a metaphor here. It's entirely literal: Americans
> now feel they must apologise for having a 'backward' system of
> measure.
>
I'm an American and I have never felt the need to apologize. Why
do you?

/BAH
From: J. Clarke on 12 Feb 2010 09:57
jmfbahciv wrote:
> Andrew Usher wrote:
>> Bob Myers wrote:
>>
>>>> Drills already have interchangeable bits,
>>> Ah, another person who's never seen the inside of
>>> a machine shop...
>>
>> OK, perhaps I didn't use the right terminology; I used that which I
>> am familiar. Nevertheless, my point stands that you don't normally
>> need a different machine for each different size of drilling.
>
> Now ask the question why that is so.

I'm not sure I see the point of this particular discussion. Most drills
have three-jaw chucks that don't really require much of the drill bit other
than that it be round and not so big that it won't fit in the hole or so
small that the jaws won't close on it (typically about a 20:1 range).
Certainly no drill press I have owned or worked with has had any trouble
with bits that are fractional inch sizes, metric sizes, or sizes that are
pretty much arbitrary.

There are machines that require bits with tapered shanks or that use collets
that require shanks of a specified dimension and form, or that require
threaded shanks, but they are relatively rare--most drilling is done with
the bits secured in a 3-jaw chuck and 3-jaw chucks are measurement-system
agnostic.

Now if you're dealing with very small drills, circuit board drills, and the
like, they do often have a standard shank diameter, mainly because their
small diameter would make them difficult to handle otherwise (like you'd
need tweezers and a magnifier to change bits) and there the measurement
system does matter, but swapping out a collet takes seconds.

From: Bob Myers on 12 Feb 2010 11:29
Andrew Usher wrote:
> Bob Myers wrote:
>
>>> Drills already have interchangeable bits,
>>
>> Ah, another person who's never seen the inside of
>> a machine shop...
>
> OK, perhaps I didn't use the right terminology; I used that which I am
> familiar. Nevertheless, my point stands that you don't normally need a
> different machine for each different size of drilling.
>
> And honestly you must know that.

Right - but the point, which you keep ignoring,
was that as long as there as two such redundant
systems in use, shops need to keep two complete
sets of such tooling in place and maintained, for no
particularly good reason.

Bob M.


From: Michael Stemper on 12 Feb 2010 13:02
In article <joo1n55f1f4is2notocvi6elvku27ar5q9(a)4ax.com>, Matt <30days(a)net.net> writes:
>On Thu, 04 Feb 2010 08:39:37 -0500, jmfbahciv wrote:

>Electricity and fields don't care what units we use.
>
>The engineers who design the equipment may care; or they may be more
>interested in the project than a religious war about systems of units.

Of course, all electrical engineering units are metric. Volts are
joules/coulomb, and a joule is a kg-m^2/s^2. An Ampere is (or was)
defined in terms of Newtons of force per meter on conductors separated
by one meter.

No pounds, slugs, or BTUs involved.

>They may dismiss the metric crusaders as noise.

Electrical engineering is already metric. We look with pity upon our
brother (and sister) mechanical engineers, who through no fault of
their own, still need to deal with BTUs and Farenheit degrees.

--
Michael F. Stemper
#include <Standard_Disclaimer>
Life's too important to take seriously.
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