No really quite sure how to describe this but here goes:
I have previously tried designing this many times, but fail every single time. I have a Stokke tripp trapp chair for my kids, and I want to design something that can slide into the ‘tracks’ (?)
I’m struggling with the rounded shape. I have tried taking a picture, and tracing along the edge with the spline tool. I found this extremely tedious, and almost impossible to fine-tune after the fact (didn’t manage to make a shape that fit).
I was hoping that either the circle, ellipse or arc tool would work, but I can’t get any of them to fit this shape…
The next issue is the curvature of the front edge of the chair, in addition to the slope of it. Even when I managed to make a rounded shape that somewhat fit, I had no chance designing the rest of the assembly (attaching it to the chair).
Any guides that might help me? Tools that I have overlooked? My first goal is to be able to basically design the above adapter, before I move on to my design.
Post a perfect side profile pick (90deg) of the chair. Post a front profile pic perfectly inline with the groove so the shape can be seen. We will help you.
Actually you can also download the STL file for the white plastic clip and import it into Shapr. Then you should be able to split the body to get the profile you need for your sketch.
Famous chairs and stuff from Ikea are readily available as 3d models.
There are few different sources where you a download 3d files from a google search.
OBJ is available, you can open it in something like Prusa Slicer and save it out as STL which you can open in Shapr and like Oregon mentioned use that to profile, you could even match the 3d file with picture to confirm even more.
And by quickly looking at it might be an oval. When you profile use a circle and scale the sketch non uniformly to match the curvature.
made an intersection of the part of it where it fits in the groove. Then traced it with the spline tool into a sketch. You can right click on face (windows) and choose sketch on face.
I couldn’t split STL body OR project the face of the STL OR select edges on a body that the STL was subtracted from to project them??? That’s not ideal!
My initial idea was to sketch out the rounded shape that goes into the groove, and then extrude that. From there I’m a bit lost. I have tried sketching on the side-profile, and combining the two objects, but never quite got that. (sorry, I haven’t had the time to sit back down and try this again, I have no pictures to show). Any ideas?
If it’s unclear, I’ll try to sketch it later today and post some picture.
As a quick measure of the radius of the grooves on the chair.
Press a strip of paper in to the groove with your finger, mark with a pen each corner where the paper comes out of the round groove.
Flatten the paper out and measure the distance between the two pen marks.
Divide this measurement by PI and you have the radius.
That looks quite convenient! Will have to look into that. Also very intrigued by a 3D scanner, but hesitant to spend $1k+ when my designing skills are this bad still.
Any suggestions to get started on the next part of this model? The part that wraps around the chair. I feel like whatever plane I try to sketch it on, it doesn’t make sense. I’m obviously missing a bit of experience here, but I’m unable to find any resources that works for this situation.
Construction planes are your friend. You can make an offset plane (and others). Don’t forget you can rotate and move them to create new sketches where you need them. I often make a plane then rotate it 90 to suit my needs.
Where you might be having a problem is how to approach your project. I usually start with external sketches. Do you have a digital caliper for measuring (assuming you have the Ikea trofast)?
In my problem I have a button that has a low angle of force to load filament. Major problem pushing and loading because it is on a shelf overhead. I am importing this photo into shapr to determine the angle I need. And I have another drawing with measurements.
