Hi guys,
i wanted to try to draw this stand but honestly i have no idea how to draw it.

I tried but I can't recreate that shape .... do you have any ideas ??

Hi Tony,

Just a few started suggestions:

Make a few basic shapes, and remove unwanted portions. Also use fillet, maybe blend.
The ball shape can begin as a revolved (quarter) circle. Maybe use blend also.

Extrude 3/4 of a 2D rectangle (with added thickness) to make the "U-Channel", to your desired dimensions, with extended length.

The rise in the middle, an extruded rectangle, maybe tapered. Then add fillet's. Remove bottom.

The neck?

- Brian

I did not understand the steps is it possible if you do not mind attaching the procedure to me in outline?

Hi Tony,

1. Establish some desired dimensions.
2. Use Rectangle to make an end 2D profile. e.g. width 6" by 2". (red & green lines)
3. Offset to the inside to give the U form thickness. e.g 0.25".
4. Remove the top of the rectangle to make a U. Trim with lines or extend two interior side lines and trim, close top 0.25 gap. (Red end surface)
5. extrude to 12'' (Only about 6 to 10 inches will remain in the finished bracket.)
6. Boolean Difference the 2" sides at an angle, say with a sloped line. The U is now a solid
7. Use Rectangle and extrude again to make the center rise. 0.75" tall, 3.5" wide, and 8" long. A solid.
8. Place solid in the center of the U, about 1" from the end profile of the U.
9 Fillet the solid center, top edge and bottom edge...Remove excess bottom side...

10. Make the "trailer ball mount" It could be a sphere, offset, with bottom 5/8 cut off. Or just revolve an arc, or an offset arc, or ...

11. The "neck" could be made in various ways...

- Brian

I'm sure others will help...

(model not to scale...)

Thanks, I'll try the various steps;)

Order of fillets is necessary else they will failed! ;)
So don't make all in the same time!

Hi Tony, do you possibly have any other views of it?

I'd probably concentrate initially on the bottom plate and the central raised area as a separate object booleaned on like Pilou's screenshots show above.

If you get stuck please post the .3dm model file of what you've tried.

- Michael

I was thinking Blend a portion of the bottom edge of the "ball" into a trimmed Pilou "neck"...
- B

Hi Michael ... I followed the advice of Pilou and Bemfarmer

The most complicated part (at least for me) is the central support in the sense that when I make cuts the surface becomes irregular ... certainly due to the "wrong" curves I create to eliminate the useless portions.

I attach the 3dm

Same as above! ;)

Put a thickness to your up piece
Boolean union all
and make the same order of Fillets as shown above!

Like this you can make anything you want! ;)



and with the Transform / Flow function you can maybe make some funny volumes
if you take target surfaces / volumes adapted! ;)

Hi Tony, I've attached a result where I cleaned up some coplanar pieces to be large single planes, constructed another revolve to give it thickness, and used Edit > Trim to cut pieces and then Edit > Join to glue it together into a solid.

Is this going in the right direction for what you need?

Then for the center area see what Pilou is doing above - you would probably want to build a separate solid for that, then boolean union with this one and then fillet edges like Pilou shows above.

- Michael

Yes Michael is the effect I wanted .... the only thing that I am not good at is drawing a line to make the sides homogeneous for a fillet .... in the sense that if I draw a rigid line it gives me acute angles. ... I don't understand how but above all where to draw a line to avoid sharp cuts on the model.

If you see the original model it has a sort of 45 ° bevel on the sides ... that's what I can't achieve .... the rest is good or bad :)

General advice : why put thickness on general form before any operations ?

Because all will be very more difficult after for any drilling, Trimming, Flow etc...

Hi Tony, for that I'm thinking maybe building the full extended shape like this:



Then the projection of the 45 degree line onto that will look like this:




So maybe adding in some additional cutters from a side profile:





Is that looking like it's closer?

- Michael

You can make also more brutal boolean Diff ;)
Like this you draw any form of curve from Top view!
Here a simple Arc curvature but anything can be drawn!
As you see i make a little rotation (or any move) for any position you want...

Yes, much better Michael ..... I didn't understand well ... but after the projections how do you cut the model at the height of the round part?

Thanks Pilou .... I can't see the video well :(

Curious! You should...but another format maybe :)

Hi Tony, so the problem is that with the projections happening from 2 different directions it will still yield a sharp area like this:



To avoid that sharp edge there it could be good to form a smooth path by putting in a blend curve, and then since the blend curve is not directly on the surface you would need to form a parting surface by something like a sweep:







- Michael

Pilou if I understood correctly in this way?

I am attaching the 3dm