Fraction Table - Router Forums
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post #1 of 38 (permalink) Old 05-15-2015, 10:15 PM Thread Starter
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Lightbulb Fraction Table

OK, I admit it . . . I'm lazy! One of the very few things that I hate about woodworking is having to convert between decimals and fractions.

Maybe you'll find this spreadsheet handy. At a glance you can find the nearest acceptable fraction for a decimal number, or find the nearest 1/16" increment from a caliper reading in 124ths of an inch. I keep a screen shot on my phone, and a hard copy in a clear sheet protector on a nail near my work area.
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post #2 of 38 (permalink) Old 05-16-2015, 12:23 AM
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Save yourself a lot of time and effort and just buy an all metric tape. Lee Valley sells at least one. No fractions. Everything is base 10.
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Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #3 of 38 (permalink) Old 05-16-2015, 12:47 AM Thread Starter
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But then I'd be spending my time converting back and forth between metric and US measurements . . . lol. Something about old dogs . . .
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post #4 of 38 (permalink) Old 05-16-2015, 12:55 AM
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so get a dual/tri measure caliper that will auto convert from unit of measure to another...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #5 of 38 (permalink) Old 05-16-2015, 01:32 AM Thread Starter
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I don't see where that would help me Stick, my calipers can read in decimal, fractions, or metric but that doesn't help when I get a reading like 73/128" or .573". With a quick glance at my table I can see that it's about 1/128" away from 9/16" which is something that I 'can' find on my marking scale and is close enough for most things.
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post #6 of 38 (permalink) Old 05-16-2015, 01:33 AM
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I don't see where that would help me Stick, my calipers can read in decimal, fractions, or metric but that doesn't help when I get a reading like 73/128" or .573". With a quick glance at my table I can see that it's about 1/128" away from 9/16" which is something that I 'can' find on my marking scale and is close enough for most things.
you doing woodworking w/ those measurements???

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #7 of 38 (permalink) Old 05-16-2015, 01:38 AM Thread Starter
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Did I say that I was new to this?

I'm not trying to work to the nearest 128th, but that is often the kind of number that I read on my caliper. I've tried opening and closing the jaws to try to find a more 'usable' number but that too is frustrating. This is why I created the table.
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post #8 of 38 (permalink) Old 05-16-2015, 02:10 AM
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Did I say that I was new to this?

I'm not trying to work to the nearest 128th, but that is often the kind of number that I read on my caliper. I've tried opening and closing the jaws to try to find a more 'usable' number but that too is frustrating. This is why I created the table.
you need a new set of calipers or stop using them and go w/ rulers...
get a set that only show larger units of measure... dial instead of digital...
in a former life were you a machinist or engineer???

as your experience in WW matures you will more than likely find that working to a 32nd of an inch is very acceptable in woodworking...
too tight of tolerances will work against you more often than they will help...
natural wood movement or the thickness of pencil mark will defeat or lend to a lot of difficulties in attempts to work in finer tolerances...
the part I'm having difficulty with is why all the need for conversions down to such finite measures...
if you need to work in decimals get an engineer's rule...
use the measuring instruments for the units of measure you choose work in....
FWIW.. doing conversions lends to mistakes/measures and will show up in the final project ......
the plus side to that is you will learn a new skill level set working out of the mistakes...
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This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #9 of 38 (permalink) Old 05-16-2015, 02:24 AM
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Originally Posted by Ratbob View Post
Did I say that I was new to this?

I'm not trying to work to the nearest 128th, but that is often the kind of number that I read on my caliper. I've tried opening and closing the jaws to try to find a more 'usable' number but that too is frustrating. This is why I created the table.
you could lean a crude compensation math...
add or subtract a 1/128 and divide that number by two to get the nearest 64th...
add or subtract a 3/128 and divide that number by four to get the nearest 32nd...
add or subtract a 7/128 and divide that number by eight to get the nearest 16th..
you get the idea...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #10 of 38 (permalink) Old 05-16-2015, 03:11 AM Thread Starter
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Quote:
Originally Posted by Stick486 View Post
you need a new set of calipers or stop using them and go w/ rulers...
get a set that only show larger units of measure... dial instead of digital...
in a former life were you a machinist or engineer???

as your experience in WW matures you will more than likely find that working to a 32nd of an inch is very acceptable in woodworking...
too tight of tolerances will work against you more often than they will help...
natural wood movement or the thickness of pencil mark will defeat or lend to a lot of difficulties in attempts to work in finer tolerances...
the part I'm having difficulty with is why all the need for conversions down to such finite measures...
if you need to work in decimals get an engineer's rule...
use the measuring instruments for the units of measure you choose work in....
FWIW.. doing conversions lends to mistakes/measures and will show up in the final project ......
the plus side to that is you will learn a new skill level set working out of the mistakes...
I am an electrical engineer, have been for a long time. As I'm trying to become proficient in WW I want to be able to produce joints that 'fit'. To this end I replaced my dial caliper (.01" res) with a cheap digital caliper (.001" res) thinking that the fractional readout would be useful.

I do most of my measuring and marking with tape, rule, and combo square, but sometimes a caliper is the right tool. Now I can easily relate the ridiculously precise readings to something a little more practical.

As another example, I was just working to a plan that spec'd a 3/8" hole centered 0.360" from the edge and 0.312" from the end. How would you mark that for the drill? With a glance at the chart I marked half way between 11/32 and 12/32 from the edge, and 5/16 from the end. Took all of 5 seconds to figure out.
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