topic Bow riser with complex handle in Fusion Design, Validate & Document Forum

Bow riser with complex handle

zappyzp — Fri, 23 Apr 2021 03:42:51 GMT

I might have aimed too high for a first design but curiosity got to me.

I tried to make a bow riser to emulate the shape of a reflex bow using modern limbs but the handle turned out to be way more complex than I thought it was going to be. I drew out the general shape of it but have no clue how to turn it into a body that follows the sketch. I did look up how sculpt but I don't know if its possible to replicate the shape without resorting to forms that have over 1000 parts.

Re: Bow riser with complex handle

barry9UDQ6 — Fri, 23 Apr 2021 07:12:29 GMT

I think you have done really well!

Rather have more sketches, with 1 profile/sketch. It makes the loft command work better.

Keep your sketches 2d unless you have no other option. Each 1 of the below is a different sketch on a plane.

And the same for the rails, as above, more sketches.

The only issue with this is the rail on the corner, there must be a point where it doesn't touch 1 of the profiles.

And for your 'star' lines that you have used to position the points on the profile. Make them construction so that your outer profile gets read as closed, as in my first pic above.

Re: Bow riser with complex handle

TrippyLighting — Fri, 23 Apr 2021 12:36:29 GMT

@barry9UDQ6 has already shown how to use the loft command.

However, I'd like to add a few points. The usual workflow in Solid Modeling is to first create mostly sharp edged objects and later add fillets to "round things off", because very few manufactured physical artifacts have these artificially sharp CAD edges. Even in many cases when modeling with surfaces that works fine.

However, where that approach often fails is when you loft from a round shape to a sharp edged one. IN this case ellipses to a rectangle.

If you are fine with these sharp edges on the brackets and don't want to fillet these then that will work fine.

If not I'd suggest filleting those before you loft. That has a potential to make lofting more complicated, but will yield much better results.

Re: Bow riser with complex handle

zappyzp — Fri, 23 Apr 2021 23:02:46 GMT

Changing the internal spokes into construction lines solved my issue.

I did try filleting before lofting but as you said, it really doesn't work for my specific use case.

Thanks for the help.