Development of spiral plate complete with straight sections

[ALAN RODDY]

Good morning

 

 

can you please help with the following request:

 

 

Please see image, i am trying to model a spiral which as straight sections on each end. The sprial it self can be developed in sheet metal,

but once i added the straight sections the plate does not flatten. I think its due to the transition between the straight and the spiral

causing the issues.

Can anyone please help.

[ALAN RODDY]

Hi

 

 

i have found a way around my issue, instead of using line + spline + line with coincident constraits i used tangent constraits inbetwwen the lines and spline.

By using tangent constraits it allows me to develop the plate.

 

 

Thanks

[Pablo Ferral]

Hi Alan,

 

That sounds right, the non-tangent condition at the ends may have created a little ridge meaning that the face wasn't continuous. You might have also been able to solve it by adding a bend across the edge, but the solution you found sounds neater.

here are a few more tips you might find handy:

http://graitec.co.uk/blog/entry/autodesk-inventor-sheet-metal-flat-pattern-success-every-time

[ALAN RODDY]

Thanks Pablo

 

 

I am still having a issue with the development of the plate looking a bit odd, its should be a rectangle with two straight end sections.

But I think the tangent constraint seems to be manipulating the development by adding arcs to the flat plate.

I am not sure how to reduce the effects on the spline when using this constraints.

 

 

Regards

 

 

Alan