Is Curved Truss Tool Wrong?

[Haydenovative]

Hey Gang,

I've hit an issue within the curved truss tool and I wanted to bounce it off the community to see if the error lies in the tool or in my understanding of truss circles.

in my case I am working with Global F34 Truss which is 290mm Box. I open the tool and I want to create 4 90° sections and then create a circle. I have set the radius to 2000mm in an effort to create a 4m circle.

After I have created my circle I measure to the outside edges of the circle and I get 4290mm In order to get the desired outcome I am forced to use (2000mm - (290/2)) or 1855mm

Is circle truss often calculated to the centre of each run?

Ideally I would like to see ID (Inside Dimension) and OD (Outside Dimension) both as editable fields. Once the truss dimensions are added ID= x + Width OD= x - Width

[klinzey]

Currently the radius of the curved truss is determined by center-line of the truss, not the ID or OD.

[Haydenovative]

Hi Kevin,

I understand that this is the case and perhaps I should have said that just that to be less verbose. My question to the greater community is, does that calculation method seem intuitive?

We have a team of very experienced production managers who have unanimously decried this method as at least Australian suppliers either use ID or OD measurements. I'm interested if this is a standard elsewhere internationally and perhaps we are a bit backwards (As is often the case down under) or if the tool could/should be tweaked as I had previously mentioned. Can anyone weigh in on this with their opinion.

Thank you all for your time.

[C. Andrew Dunning]

Hayden -

You're not wrong (or backwards) in your expectations as to how the curved truss tool should work. By itself, it simply doesn't "think" the way any of its users do. For that reason, you might find this thread interesting: https://techboard.vectorworks.net/ubbthreads.php?ubb=showflat&Number=199763#Post199763.