Inventor Josh

Inventor Josh

Inventor / Maker / 3D printer-er / Hexagons. Follow along to see my projects, how-to guides, blog posts, and other maker content!

Operating as usual

Photos from Inventor Josh's post 25/10/2020

Today I made a replacement drive cap (??) for an automatic wheelchair.


Turns out you can make helical gears just by adding a twist factor. The main difference is that all gears which mesh together must have opposite helix angles. Pretty neat!


It looks strikingly like the preview :D


There is one design flaw that I keep procrastinating about. There is, erm, nothing other than friction and gravity which keeps the ring gear in place.

Seems fine...

Photos from Inventor Josh's post 26/06/2020

This assembly concept for Axis1-Axis2 is surprisingly very strong and actually worked.

Photos from Inventor Josh's post 25/06/2020

Taking a break from that armature attachment. Instead, I wanted to share a little bit on Axis-1! Here's the planetary gear assembly.


Progress is happening. We've gone from "so futuristic it's not a possible shape to print" to "horrific chainsaw attachment, but technically feasible".


Here's my takeaway for designing a cool looking armature:

- Oval shaped cut-outs are an instant value add.
- Fillet all the things.
- Long and rectangular is better than short and bulky.
- Keep parts that stick out (motor) as close to the center of rotation as possible.


I went too futuristic! This looks cool but is not even remotely functional. It's still a fun exercise in 3D-design though :D


Recently I attempted to put some thoughts into SolidWorks for the third axis. What I came up with is... unsettling. Currently trying to suss out how I can pivot to, well, anything resembling "futuristic" would be nice.


I love making everything parametric in SolidWorks. I might have a problem.


I am hell-bent on using this 0.9deg stepper motor for the first 3 axis of my robotic arm. I am kind of worried that the moment arm for Axis 3 is going to cause too much strain. But we'll see! What else are prototypes for?


My robotic arm project is getting serious. I'm probably going to start a Hackaday page for it soon. Here's Axis-1 and Axis-2 fully printed and attached.

Photos from Inventor Josh's post 12/06/2020

Y'all, my gearbox (and SolidWorks competency) has come a long way.

Photos from Inventor Josh's post 25/05/2020

3:1 stepper ratio - unlocked, in the real!

Photos from Inventor Josh's post 24/05/2020

Alright well that wasn't so bad! After a few small tweaks to make the geometry more 3d-printer friendly, I can prototype it.


The gear I designed earlier is now securely fastened to the shaft of the motor, and housed within a prototype gearbox :D


Of course I made a gear :D


SolidWorks is so cool! The assembly feature is going to make a big difference for my projects, I think.


I used a TINY bit of trig this weekend to create a function in openSCAD where you can give it an array of tuples with [distance, angle] and it creates a joint where each element is relative to the previous one (and rotated correctly)

With this, I made a gearbox generator where I can put how far away each gear segment needs to be to mesh, and then an angle to rotate it so it is positioned wherever I need. This is a much easier way to min/max the final output location without randomly guessing offsets.

Code here:

Photos from Inventor Josh's post 10/05/2020

Looks crazy but I think I have a working plan for how to assemble the first axis of movement on my robotic arm project. Just have to wait most of the day for my final print to finish :D

Photos from Inventor Josh's post 03/05/2020

Today I'm designing a NEMA17 planetary gear mount!

Photos from Inventor Josh's post 21/03/2020

Today's project is building a 4.5ft planter box!

Photos from Inventor Josh's post 20/03/2020

This is either brilliant or horrible. Designing a converter so I can mount this tiny vice using the screws I've got on-hand rather than a giant bolt.


This is a cool design technique. I was able to use a 0.5mm overhang to create a lip on a part which keeps a bearing in place while being able to be printed without support.


This weekend I finished designing & printing my first planetary gear system :D

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