You might want to consider the possibility that there is a whole world of
manufacturing that does not deal with millions of a single item. And
prototypes are not part of the process. When a product life might extend
over ten years and you can expect to get orders for two or three per year
(you know there are products that cost tens of millions of dollars) then
high volume is of much less interest. Of course, a single part might
require a five axis machine and then things are again different. I vividly
recall one sales visit when I was only 35 or 40, and still hadn't learned
anything, and found that a very familiar product was still being
manufactured in a room with a dirt floor.
Lee
----- Original Message -----
From: "Chuck Harris" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Saturday, December 17, 2011 9:31 PM
Subject: Re: [time-nuts] metric / English
The manual machines are still in use for limited production runs,
such as are used in prototype manufacture.
Screw machines, and second op lathes see extensive use in
manufacturing because they are quicker than CNC machines...
that and very cheap to use.
I use manual machines because it is quicker to whittle out a prototype
chassis or do-dad on manual machines than it is to do a formal
CAD drawing, and then work out the tool paths to do it on a CNC
machine... and then find you have made it a mistake... wash rinse
repeat... CNC machines are like printers. In theory they save
time and materials, but in practice, they can burn time and waste
materials like no human running a manual machine ever would.
[As a tree farmer, who sells trees into pulp production, computers
and printers have been a godsend. More trees go into paper
production today then ever did before the advent of the "paperless"
office.]
-Chuck Harris
Chris Albertson wrote:
On Sat, Dec 17, 2011 at 4:48 AM, Chuck Harris<[email protected]> wrote:
Which works very well, but unlike all of the English
thread combinations, you must keep the lathe's half-nuts
engaged to the lead screw ALWAYS. That means when you reach
the end of the thread, you must stop the lathe, and back
it up to the beginning of the thread to make the next cut.
That method always works. But another might. There will always be
some integer number of pitches that get you back exactly without
error. But it might be say 5 inches back so there is almost always a
way to run only forward you method might be the best.
But are people still using these old machines for production work?
Chris Albertson
Redondo Beach, California
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