Design the plotter in CAD + build V0

[feeds]

• [x] IMPORTANT(on thursday): is our "fusion cloud" is going to be a file on here, or have we came up with a solution so we can all use Fusion's teams?
• [x] decide a general size and start sketching by hand => until thursday session, change size according to the input given here
• [x] decide clamp size thursday to ensure enough space is left inside for its maximal size
• [x] Motor placement?
• [ ] include camera in CAD design
• [ ] draw a COMPLETE CAD design for the plotter, with the rails as christoph suggested
• [ ] configuration system?
• [ ] If feasible, start building this thing

[pinar-oray]

We will be using freeCAD for this project. Edit: not this week

[malenraychev]

For this week, partial design. Priority for next week.

[malenraychev]

@nourguermazi @gruvw Will help with the CAD design and build prototype for dimensions

[pinar-oray]

@feeds can we use onshape (https://www.onshape.com/en/) for modeling? we have group folders all of us can access and it is on browser. it looks for the moment adequate for the project but we wanted to check it with you first

[feeds]

This seems ok, since you can get a student license! Please go ahead.

[gruvw]

For the record, I will be designing the y-axis part :)

[gruvw]

We went to the shop and ordered the (4) metal bars to make our axes. They should arrive before Tuesday, we will get an email when they are ready.

[gruvw]

Here is also a snapshot of my work during the week for design of the y axis:

(not the final version of course, V1)

Btw, we are still missing some minor parts that you have in the shop downstairs: the belts (same as in personal project) and the "gears" that are in contact with the belts and connected to the motor.

[gruvw]

Hey, so I have been doing a little more designing, and I was thinking of ways to replace the bulky non-practical solenoid by a linear actuator motion controlled by one small servo.

After researching online for inspiration, I found the following two interesting projects:

• https://grabcad.com/library/linear-motion-with-mg90s-servo-1
• https://www.thingiverse.com/thing:3170748

I went ahead and CAD designed a V1 of a contraption that is kind of a mix of both solutions above. I am excited to see how it will turn out in reality 👍

[pinar-oray]

I have a v1 for the plotter itself, the only thing is that the dimensions are looking off to me. I also for the moment set inner wall heights half of the outer wall height. If I have gotten a concept wrong, let me know and I can change it until tuesday. I hope to print+ assemble this tuesday morning.

Also added the magnet holes for the fixed part of the clamp here:

[pinar-oray]

Here's also a version with a base plate, the height probably needs adjustment but it has a 0.5mm offset at the bottom to account for screw heads etc. This needs also the holes on the base plate for clamp: todo monday

[feeds]

Where would the remote be placed? If they are infrared, the way they emit the signal cannot be obstructed by any walls.

[pinar-oray]

@feeds, you're absolutely right 😅 After a discussion yesterday we have this new design, which is lacking the clamp connection, and the laser cut joints until everyone comments on this general idea.

The inner area is divided into two: the bottom (smaller) area is the moving axis starting position, and the rest of this inner area is where the clamp + remote is placed. Before tomorrow we might adjust the height of the columns so that the rods going through them are at a correct height for the belt system.

Here's a read-only link to the design: onshape

(Edit: the random rectangle hovering on the right side is actually the belt, just included that in for reference)

[gruvw]

So today I have tested the new actuation system (replacing the solenoid part) that I designed, and it has proven to work wonderfully!

It provides more than 3 cm of actuation length (which should be enough but can easily be extended if necessary), and I think it has enough force even with the small servo version :)

[gruvw]

So, for the record, this is my final work for this week:

• [X] researched and found 3D CAD alternative that would work for the whole team (onshape)
• [X] setup OnShape team folder and shared with everyone
• [X] provided the team with a remote control with feedback
• [X] design y axis holder
• [X] reasearched and found linear actuation using a servo to replace the solenoid
• [X] designed in CAD a V1 of the linear rail actuator
• [X] print y axis holder v1
• [X] fix problems and improve CAD
• [X] print the 3 pieces of the y axis + assemble
• [X] improve the rail actuation system
• [X] fix CAD with final fixes from final assembly
• [X] get missing parts (belt + gears) from TAs

And here is the result: