Challenge - fillet and constraint

[Tom_P]

ok let s combine the fillets and (non implemented) constraints to a nice new challenge.

rolling ball, true arc only !

@wim

The developers asked for feedback that would allow them to define that project better but felt that this feedback never came.

well we had this nice topic

@Tom_P

image1300×938 76.7 KB

the challenge

find a nice position for the red/violett surface so the final R15 fillets nicely.
and not as bad as above surfaces.

the main challenge is to find the blue curve (one arc, one line, between (x) and (x))

the result

the green planar Surface and the Radius of the blueish fillet are set to have a single Corner Fillet.

boxWithWingChallenge_00_rh8.3dm (73.9 KB)

i was not able to find a nice solution without cheating with grasshoppers digit-scroller … or use a modeller with constraints - see this Arc - challenge

happy modelling - kind regards - tom

[Gijs (Gijs de Zwart)]

boxWithWingChallenge_00_rh8_sg.3dm (243.6 KB)

The trick here is to offset the surface over the desired radius and than use scaling to align the seams, then offset back and fillet.

[Tom_P]

@Gijs

offset the surface over the desired radius

nice.
yes, that was also part of my approach.

… but your un-fillet surfaces do not hit the dot at z=80

… which let me to this nested arc-construction challenge
… which emphasises that constraints would be nice. ;-D

[Gijs (Gijs de Zwart)]

I missed that condition. So the idea is that the height of the horizontal plane stays put as well? And the tilted surface angle is not defined?

[Tom_P]

sorry if i was not precise about this - but that s the part where constraints would come into play…

@Gijs

tilted surface angle is not defined?

yes the angle is free.

@Tom_P

the main challenge is to find the blue curve (one arc, one line, between (x) and (x))

[jim]

@Tom_P

yes the angle is free.

If the angle of the tilted plane can be anything that makes it pretty easy (see image below)

Make the green surface (any radius that extends far enough)
Then make the cyan fillet (10 mm in this example)
Then split the green surface where the cyan fillet ends (at the black line)
Then make the red tilted plane tangent to the green
then continue with next fillet

boxWithWingChallengex.3dm (111.4 KB)

[Gijs (Gijs de Zwart)]

@jim the constraint you and I missed is that the height of the untrimmed upper edge needs to be 80

It comes down to solving this:

Which might be possible, but is significantly harder without using constraints.

[lander (CAD CAM CNC)]

@Tom_P

… which emphasises that constraints would be nice. ;-D

yes

@Gijs

might be possible, but is significantly harder without using constraints.

yes lets put constraints into Rhino natively

[jim]

@Gijs

the height of the untrimmed upper edge needs to be 80

This is what I get when the tilted plane must go thru the upper corner of the 125mm Radius
I used the same method I used with Tom’s other challenge.

boxWithWingChallengex2.3dm (118.3 KB)

[spb (Steven Burzinski)]

@Tom_P

which emphasises that constraints would be nice.

Tom,

If Rhino had sketch constraints, what would be your workflow to solve this problem?