I can see two problems with metri system is there nothing like a inch. If metric had constructed units base metric.?
Like 25 mm and use as 1 unit .
Maybe say mi so could say I need 4 mi witch is 100mm.
The other is Celsius 0 to 100 but too 2X? Celsius to out temperature gauge would read 0 to 100°CD witch would be in Celsius 0 to 100° or in fahrenheit 32° to 122°F very close but more usable. I see all time where a country is still using inch and fahrenheit anc say they metric.??
Metric needs to be more friendly and it would a big winner.
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The metric was developed for easy calculations not user friendly?
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Dave?
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On Thu, Jul 25, 2024 at 03:29 PM, Charles Daldry wrote:
The metric system started in Germany 1872.?
On 7/25/24 10:56, davesmith1800 wrote:
I would look at old England standard screws.?
Metric has not been around that long.?
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Dave?
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On Thu, Jul 25, 2024 at 09:50 AM, Charles Kinzer wrote:
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Good question.? You may have to measure threads and diameters to determine what they are.? (Learning how to measure threads is a good idea anyway.)? And whether they are odd sizes (today) or not.? And if an odd size, what is closest.
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It isn't necessarily easy to make threads with a minilathe in all cases if you are talking about single point threading.? The change gears only support a fixed number of thread choices, and some odd thread pitch probably is not one of them.? Of course, if using a die, that doesn't matter.? But for an archaic thread size you might have trouble finding a die.
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And then there is the issue of the screw head.? That can be difficult to varying degrees depending on what type of screw head is required.
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You might try this Groups.IO group:
Topics on specialized replica engineering, fabrication and antique tool?restoration?are all fair game.Created:?10/27/19
Charles E. "Chuck" Kinzer
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On Thursday, July 25, 2024 at 09:25:11 AM PDT, Johannes
<johannes@...> wrote:
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I have got a C1900 "Guhl & Harbeck , Hamburg" pencil sharpener for restoration . Jupiter 1
Some screws are missing, and before I force in some modern ISO screws;?
Had Germany their own screws size 100+ years ago??
I cannot find a " pencil sharpener IO group" , so I am asking you.
New screws can easy be made with a 7x12 lathe ?
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Johannes
Mexico
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davesmith1800