Pumpkin Pie.

[Wallace]

Attachment 5653

anyone want to try this for size? I have used the same methods for the rings... but up-scaled it for bangles and collars (I think??)

[trialuser]

Hi Wallace, can I ask why you have chosen 3.147 as Pi?
It seems slightly odd, especially as you have gone to the level of 3 decimal places
Although it probably doesn't make any real difference in practice.

[ps_bond]

Not sure I dare do any arithmetic after last time...
For a 17.93mm diameter, circumference using Pi @ 3.147 = 56.426 to 3 dec places
Using Pi @ 3.1415926535897932384626433832795 (copy & paste, Windows calculator) = 56.329 to 3 dec places.

0.172% error.

Measure with a micrometer. Mark with chalk. Cut with an axe.

[Wallace]

Lol.... Was trying to help. Isn't pi 3.14? At 4 decimal places in mm, it was just the sumif function and being old, the pi was probably rhubarb or something . It worked on the original. But need to check to conversion when I get to my main PC. Thanks for checking. Back to the machine with my calc (works better than my working out the fx iin excel). No- one has to use anything, lol...thanks for checking it though.

[trialuser]

Measure with a micrometer. Mark with chalk. Cut with an axe.

Lol - absolutely agree it makes no difference in real life.
I was just curious as Wallace had gone to the trouble of calculating to 3 decmal places and used a strange value for Pi.
I wondered if (s)he had picked up an anomaly in the original calculator that was needed to get it to work.
Wallace - it would be more usual to use 3.142 - but 3.147 is fine :-)
Thanks for doing it - I had been using the 'at the bench' one.
Martyn.

[Didi]

Thanks to all. Prefer Apple pie to either pumpkin or rhubarb but love easy ways to get it right
Didi

[metalsmith]

Perfection every time ... well almost
http://www.geom.uiuc.edu/~huberty/ma...pe/digits.html

[Dennis]

Great! beats measuring with binding wire.

[Tabby66]

Aaaaaagh

[Patstone]

Well I have used Wallace's chart and it works fine. The other day my 96 year old mum informed me that she had lots of necklaces and earrings now but could she have a ring to match a necklace and earrings that I made her for her birthday, so all I had to measure was a bit of string - worked fine, seems to be more accurate than my maths. Note to Dennis who kindly worked out some maths for me earlier, think I must have been asleep during maths lessons, can add up groceries in my head straight from the trolley/basket but anything more involved .........................