Simple sweep sees naked edge repeatedly

Rhino Rhino for Windows
1

Hi,
V5
c-d says naked edge.
how can this be when I sweep face b along that edge ?
that edge is one of two rails, surely it has to follow the edge ?

hours spent trying to create my cowling, and the most simple two faces are refusing to behave.

I stayed away from rhino the last 3 weeks, bliss !
and battle after battle. simple sweeps giving naked edges, redone some 4 times, then another pops up,
naked edge simple sweep.3dm (52.5 KB)

aaaaaagh !

AND i JUST SWEPT IT AGAIN AND IT WONT EVEN JOIN.

Steve

2

your part is 1140mm long and you are using .001mm as your tolerance…

any reason you are working so tight?

you can run matchsrf on this as is and it will join.

if you run match on the original curves then run sweep, it’ll join.

when you work at this tolerance, you will be doing alot of matching of curves and surfaces.

for something this large, you could work at .1 mm and be fine.

3

Hi,
well thats interesting.
Originally this item was ok for 1mm,
Looking at properties, I see Model tolerances and Layout tolerances.
Whats the difference ?
It was 1.0 mm for model, I never thought to look for Layout.
I then copy pasted the parts I needed out to a new file to messaround trying out some theory etc.
That was 0.01mm model and layout 0.001mm
then I copied that out again to the file for the unit emblem post to this foum, and model became 0.001mm, layoit remaining already at 0.001mm as I never look there.

so copy paste out doesnt retain tolerances.

would export selected do so ? I shall have to experiment.

A warning for us all ?

So what effect does Layout tolerance have, and also relative tolerance %

Something to read about but on items where original build plan drawings were in 1mm increments 1 seemed enough. The recipient was happy with +/-4mm in fact for their build tolerances.

Cowling tolerances
Cowling tolerances1100×1351 280 KB

Steve