I just finished looking at the plans to build Jake's Chair. The
dimensions were given in decimal form. There were several decimals
though that I didn't recognize such as .9 and .6. How are these
You can get strange things like that if the original was in metric units,
with a 'clueless' conversion to ft/inches.
And, of course, there _are_ rulers marked in decimal fractions of an inch.
Relatively uncommon, but they *do* exist.
If somebody uses 1 decimal place for things in "1/8ths", you typically
get decimal parts of: .0 .1 .2 .4 .5 .6 .8 (sometimes .7) and .9
What you're actually dealing with is anybody's guess.
If they're not rounded then I do it when I made it - just figure .9 is
7/8" and .4 is close enough to 7/16" to not make much difference in
building the chairs. It's not a matter of following the actual
dimensions in the plans to the decimal point, but making components with
the same specs the same dimensions.
That sucks if in inches--if metric, makes sense....
To convert to nearest 8th, 16th or 32nd...
0.9*8 = 7.2
0.9*16 = 14.4
0.9*32 = 28.8
Depending on how anal you are you can choose...
For me, I'd look at the 0.8 and figure it was sorry CAD formatting and
figure it was actually 0.875 rounded which would have been 7/8". 0.6
was probably 5/8".
Probably converted from metric measurements.
If you want them in fractional inches, multiply by 64 to get 64ths, e.g. 0.9 *
64 = 57.6 so 58/64 or 29/32. Similarly, 0.6 * 64 = 38.4 so 38/64 or 19/32.
Double-checking: 29/32 = 0.906; 19/32 = 0.594. Within six-thousandths each
time - probably close enough.
If not, multiply by 128 instead: 0.9 = 115/128, and 0.6 = 77/128 (both
accurate within two thou).
Doug Miller (alphageek at milmac dot com)
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