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How to add length to an ARC Length


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Hello, have a question about adding length to my ARC length. Here is my formula and a couple pictures. The formula is giving me 9.198 and i am looking for the 9.387 dimension as shown on the print. Do i have the formula set up correctly? When i try to add the .191 that is asking to the formula it doesn't come out correct to the 9.387? Thank you in advance for any help with this. 

Add Length to Arc.JPG

9.387.JPG

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Don't pcm allow you to use PI word?

Did you try out your formula with nominal values? If it matches, then your actuals are a little different so there is your mismatch.

Also there is an "angle" in radians - would be better to use Length option

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My apologies gentleman, i am not used to using formulas as often as most. This is a mirror of another ARC Length that i used from a previous but similar program. I just changed the numbers. What gets me is that I am using the correct angle and Radii that is shown. I just feel that i myself am not correct in this. This is why i ask if i add to the end of the formula + ("getActual 0.191") why it doesn't compute? Does it matter if i use the word pi compared to typing out the number? I will try it with nominal values and see if that is different. Thank you. 

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There is no need for a "getActual" if you just want to add a value. getActual is calling for the measured value of whatever feature or characteristic you specify in the parentheses following it, with the ".~~~~" following the parentheses further specifying what measured value you are looking for. If you just want to add a value, all that should be needed is +0.191. However, as indicated above, it is unlikely that arbitrarily adding some value is the correct solution, and more likely the problem is that you have measured data which is inherently imperfect, so calculating using imperfect data yields non-nominal results. To test, change your getActual to getNominal and see if things calculate correctly using nominal values, although this will also only work if your nominal values are correct in the items you are calling. 

 

Looking at the formula, there are a few additional things I see that should be checked after checking with nominal values.
1) We do not know what 7.025 Radii or Angle 75 are in Calypso (feature or characteristic type), so we cannot identify if getActual().actual is an appropriate call to return the intended value
2)as everything is in a single set of parentheses, it is possible there is some sort of order of operations issue, especially with the /360 portion. I would move the /360 outside of the parentheses, and consider the use of additional sets if needed to control order of operations and not allow Calypso to determine calculation order

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Inside the Result Element you should use Length instead of Angle (see picture). 

Moreover the angle getActual("Angle 75").actual is already in radian, so there is no need to convert it.

Provided that you have measured the radius and angle, the arc length is given by

getActual("7.025 Radii RHT").actual *  getActual("Angle 75").actual 

 

1.png

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thank you Tom, i have figured out that i had to convert the 0.191 to radians which gave me 0.0033 rad. Then when i added that to the end of the formula it gave me the correct dimension i was looking for. 

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Thank you all for the response', much appreciated. They were all educational for myself hence that is why i always refer back if i come across any programs that are needing these items.

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