I made a bit more progress on the arm today. I finished up the design for the pen gripper and the holder for multiple pens. So I think the two links of the arm are just about done.
To hold down the paper I designed four simple corner pieces that are held down with a bolt and spring. I can reach about 90% of the paper shown below with this design, so I'm pretty happy with that. I'll post dimensions of everything when I finalize the designs, but the paper shows is ~8"x10". Once I get into the programming, and depending on the actual rotation available in the servos, I might be able to get to every bit of the paper.
I have a few other projects going on, so we'll see how much progress I make over the next few weeks on this.
I need to do some clash detection and make sure I get the full range of motion that I want and all the components are clear of each other. Another thing I need to do is a test assemble digitally, to make sure I can assemble it and have clearance to insert bolts, insert servos, etc. I've had issues in the past designing things to a very tight tolerance. The laser cutter can easily achieve that but the problem comes when the other components are not so exact. Servos have cords and grommets coming out of them, wood pieces might be warped, etc.
Hopefully I can get the pieces sent out to be laser cut, and then it will be simply putting it all together. Then I can really focus on the programming and electronic components of this project.
thanks for following along!