trigonometry in manufacturing expressions

[prettygoodnotbad]

In the manufacturing workspace, for an operation parameter, is it possible to use sin/cos/tan in the expressions dialog box, if I simply input something like sin(15) I get the wrong number it outputs 0.6503 when it should be 0.2588

[Phil.E]

Do these instructions help?

https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-76272551-3275-46C4-AE4D-10D58B408C20

[Anonymous · Accepted solution]

Looks like F360 calculates in rad(ians) rather than the more known deg(rees). You'll need to multiply with Pi/180 after the angle:

value = sin[angle*(pi/180)].

I usually test in Excel with sin(30) or cos(60) which both should be 0,5.

Formula: =SIN(30*(PI()/180))

Regards

   Peter

[prettygoodnotbad]

This article seems to be about user parameters within the design workspace. I'm attempting to use trigonometry within the manufacturing workspace. For example, for a contour operation with even step downs selected and a wall taper angle of 5 deg, in the radial stock to leave field I could do something like tan(slopeAngle) * (abs(stockZLow)-maximumStepdown) in order to offset the cut to account for the slope angle.

[Anonymous · Accepted solution]

Hi prettygoodnotbad,

I haven't taken care about the workspace you're working in; I was just looking at the calculation results from sin(x). This reminds me to the rad vs. deg thing.

I have not tried to do this in manufacturing ws honestly. Just tried to figure out why the calcs looks odd.

Regards

   Peter

[prettygoodnotbad]

@Anonymous thanks, I saw your message only after posting my reply. But you are correct, what worked in the end with your example is (sin(30 * (Math.PI / 180))) * 1in this output the correct value 0.5

So for the forumla in my previous post I can do:

(tan(slopeAngle * (Math.PI / 180))) * (abs(stockZLow) - maximumStepdown)

This outputs the correct axial offset to avoid machining inside the part when using a wall taper angle.

Now I'm just waiting for someone tool tell me there is a box I could have checked that would have done exactly that. 

[steveETUVA]

The functions appear to convert to the appropriate internal units if you specify the units. If you want a specific number of degrees, then just suffix with 'deg'. E.g. sin(15 deg), or sin(0.261799 rad)