topic Re: User Parameter Function doesn't validate in Fusion Support Forum

User Parameter Function doesn't validate

petrara — Tue, 05 Feb 2019 10:52:37 GMT

Fusion 360 version 2.0.5350 - my uni did not upgrade yet to latest version.

Not sure if this is a bug or I'm not using the formulas correctly.

Trying to do some operations with a defined User Parameter, but some operations fail.

Parameter: DrvWheel_DIA = 80mm (see attachment)

Can Do:

DrvWheel_DIA + <number>
DrvWheel_DIA - <number>
DrvWheel_DIA * <number>
DrvWheel_DIA / <umber>

Can NOT Do:

DrvWheel_DIA ^ <number>
sqrt(DrvWheel_DIA)
pow(DrvWheel_DIA, <number>)

Obs: sqrt(), ^ and pow() work fine when only numbers are introduced, with no variables.

Please advise.

Re: User Parameter Function doesn't validate

jhackney1972 — Tue, 05 Feb 2019 14:22:18 GMT

You cannot take a square root of a parameter value that contains units. The answer can be found here. All you have to do is remove the units from the variable, inside the parentheses, by dividing by 1/(units).

Re: User Parameter Function doesn't validate

petrara — Tue, 05 Feb 2019 15:54:57 GMT

Thanks for the tip.

It's really confusing and I'd expect more from Autodesk and Fusion... If it can't identify the value and the unit is quite...dumb from software point of view.

Re: User Parameter Function doesn't validate

Anonymous — Mon, 15 Jun 2020 08:46:06 GMT

I think it is quite smart that Fusion 360 is unit-aware. A patch of 1x1 cm is 1 cm^2, but it is 100 mm^2, so the number depends on the unit.

My two cents: it would be nice to get a user warning explaining that the formula is red because of unit related issues.