Subject:
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Re: Hold on primitives by pneaster
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 11 Jun 2003 15:54:31 GMT
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Viewed:
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567 times
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Niels Karsdorp <nkp.nkp@hetnet.nl> schrieb im Newsbeitrag
news:HGBE24.1IJM@lugnet.com...
> Sorry, i don't know who pneaster is, but he did put a hold
> on some primitives for differences in values.
>
> I would like to know how these values are to be calculated
> (and who calculated the correct values, me or pneaster)
>
> I calculated the first value with the formula:
> 7 * SIN( PI / 8), where PI = 3.14159265358979
> (Excel can't handle more digits for PI)
> Which results into 2.67878402655563, rounded to 2,6788
>
> If I use Windows Calculator with
> PI=3.1415926535897932384626433832795
> the result is
> 2.6787840265556284020992198882128
> rounded as 2.6788
>
> How does pneaster get the result 2.6789 ????
I've the same problem on my parts.
The parts is (maybe) checked by inlining the edge.dat and then
multiplied this with the radius (for example in MLCAD).
This comes to the result of the review. The points of the edge
with radius 1 is approximate by 4 digits, but this leads to an
error when you multiply this with R to get a new circle with
this radius.
So the question is how to calculate new (round) primitives?
a) With the correct points new calculated as you write above?
or b) With the R=1 points multiplied with the new Radius?
CU Bernd
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Message has 1 Reply:
 | | Re: Hold on primitives by pneaster
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| (...) It's me... (...) I have had a few emails with the Parts Tracker admin's lately to discuss the creation of primitives. I was INCORRECTLY using the rounding method that rounded only the final results. Like this; round( r* sin( Angle ), 4). The (...) (21 years ago, 11-Jun-03, to lugnet.cad)
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Message is in Reply To:
| | Hold on primitives by pneaster
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| Sorry, i don't know who pneaster is, but he did put a hold on some primitives for differences in values. One of the primitives involved is 4-4con7.dat (...) I would like to know how these values are to be calculated (and who calculated the correct (...) (21 years ago, 11-Jun-03, to lugnet.cad)
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