Fractions

[jerry_stanek]

Hey jack where are the metric equivalent on that. I use mine all the time but now I need the metric measurements for other projects.

[adrianm]

Exactly my point from my earlier post. I think people are missing the fact that the original list that started the thread has imperial fractions, imperial decimal equivalents and metric equivalents.

Fractions converted to decimal is not the same thing as metric.

[Kyle Stapleton]

I have been told there is no true metric to English conversion. My thinking is that the conversion would leave an irrational number (like "pi" were the decimal never stops or repeats)

[myxpykalix]

Since i don't work in metric i guess i didn't think you needed that, however here is a handy conversion utility that will convert all kinds of things including what you need:
http://joshmadison.com/convert-for-windows/

[Zeron]

I have been told there is no true metric to English conversion. My thinking is that the conversion would leave an irrational number (like "pi" were the decimal never stops or repeats)

You were told wrong. In 1933 American Standards Association changed the definition of an inch to exactly 25.4mm following the British Standards Institution who did the same in 1930.

[steve_g]

Oh.. I thought it was still "three grains of barley, dry and round, placed end to end, lengthwise"

SG

[Brady Watson]

Oh.. I thought it was still "three grains of barley, dry and round, placed end to end, lengthwise"

SG

No, no, no. You're probably thinking in cubits!

Get a pen kit for your tool and make whatever chart you want for your shop. Hang it on the wall...You could include ANY conversion you want on the same chart.

Interesting the path some of these threads take. The road to hell ain't paved with asphalt...

-B

[dana_swift]

Kyle- I have the problem of having an inch based drill index, and both inch and metric taps. In the past I just figured out what drill to use each time I needed one. This thread got me thinking I could create a table of mm hole sizes and the nearest drill size above and below the exact size.

I have attached the PDF file of my results. Note there are 5 tables, each for different drill index step sizes.

Enjoy! And Merry Christmas

D


(PS this was done with a short program in C#)

[curtiss]

That is quite a chart Dana,

I suppose I could ask the next dumb question, do they make drill bits that come every 1/128th of an inch or even 1/256th ???

I don't think I even want to know...

[steve_g]

For you visual learners like me... I made a chart.

SG