topic Re: Old Dog Chasing a boat in Fusion Support Forum

Old Dog Chasing a boat

draftingrus — Fri, 16 Nov 2018 01:49:07 GMT

Greetings

I used AutoCad for a long time ... a long time... with almost no time on inventor ...

I am trying to get a handle on the new fangled fusion 360 (Thank you Auto Desk for Access)

So I started with a back yard project - lone star 16 sailboat conversion to a mini cruiser

1. I imported three canvases on three planes and Calibrated all three

2. Created three sketches (one on each plane) defining the outline of the boat

3. Set my preferences to allow 3d sketching

And am now trying to create a loft of the boat hull

Problem - I was going to create lines along the top view shape of the deck heights to get the 3d arcs for lofting and cannot get the copy command to place them properly

Question : Is this approach too "Old School" for fusion? should I using some sort of projection instead ?

Thanks for any help in advance The drawing file is attached

Re: Old Dog Chasing a boat

norbertut — Fri, 16 Nov 2018 09:52:09 GMT

The approach to use canvases is correct, and Loft would do fine.

But Loft requires two closed profiles to work. You have the side and you need to work on making a closed profile on the back. Be careful that the back is not vertical when looked at the side shape.

So for the back I would use a construction Plane at angle. And then readjust the back canvas position and draw the profile. To use correct references between sketches you need to make projections of the points (depending on your references it does it automatically or through Sketch/project/include).

Then you can use the shape of the boat taken from the top as a rail. But rails need to be touching both profiles. So I would draw it from the top corner of the back to the top front points. For this I used a three point construction plan. Created a sketch there and projected points of the two other profiles corners to connect. Then Loft using both profiles and the last line as rail. And mirror to complete the other half of the boat.

I did it quick and dirty in this file. Hope if helps to understand.

Re: Old Dog Chasing a boat

lichtzeichenanlage — Fri, 16 Nov 2018 10:17:31 GMT

Here is a great post about projections. Helped me understanding that bit and might help you, too.

Re: Old Dog Chasing a boat

jeff_strater — Fri, 16 Nov 2018 18:35:15 GMT

@draftingrus - welcome to Fusion! Boat hull modeling is a frequent topic on the Fusion forums. I've never tried to do one myself, but I understand there are some challenges involved. Here are some threads to check out if you are interested:

Re: Old Dog Chasing a boat

draftingrus — Wed, 01 Sep 2021 23:43:50 GMT

Thanks for the input .... I went back and started over watching youtube videos trying to better understand the processes and workflow - as I was not getting accurate results with simpler objects ... So it was not the tool but the operator ... Norbertut- Your results are outstanding and give me fresh hope - I have a side view and can photograph the back - Tried to chase down the accurate line drawings - but with both designer and companies long since gone that avenue has been a dead end ... Trying a few of the free photogammetry software was a bit of a bust - as they prefer high contrast and sharp edges to better define and match mesh edges - Thinking to create a grid of black crepe tape on the inverted hull so the camera has more data points to "see" might yield better results with that approach. Old School data collection of creating a table of offsets from at least two datums ... or cutting hull shape patterns every 6 inches or so - are other options ... Thanks for the help

Re: Old Dog Chasing a boat

lichtzeichenanlage — Thu, 02 Sep 2021 09:06:12 GMT

Regarding the scanner problem: Google 3d scan spray and pick one of the removables. Should be better than tape. In general those free photogammetry results aren't super accurate (if this is important). Additionally they produce a very high number of triangles, that Fusion 360 can't handle. It's also nothing you can modify in Fusion 360 well. If you want to use it as a template to model around than it's a good idea. If you search for Fusion 360 Reverse Engineer Scan on youtube you can find tutorials like this go get a starting point:

If you still try to create many data points you will never get a smooth surface. Start with as less as possible and start increasing the points if needed.