Segway Navimow Traction Wheels i Series

Upgraded Wheel and Tread system for the Segway Navimow i Series!

When I first got the Navimow I was so disappointed I was planning on returning it. It couldn't navigate the grass at all. It would get stuck left and right. I turned to online and saw all the comments about how horrible the wheels were, but I wasn't willing to spend $100 for the "Offroad" wheels when I could waste hours and hours and build my own.

I felt the biggest issue with the mower was the low front bumper. The mower would sink into the grass a little bit and then be unable to "plow" through the grass. My main focus was width. I felt if the wheels were wider it could ride along the top of the grass better and the bumper wouldn't be an issue. I also wanted a more aggressive "spike" to help dig into the grass when needed.

Upgrades:

• Wider Wheels (48mm across)
• Aggressive Modular Tread Design
   

Inspiration

While I was busy measuring making the first prototypes of this, I stumbled upon the iRim by Larsih. I took his measurements and built this from scratch in Fusion 360 (vs basing it on a canvas of the wheel). I also took his tread design as inspiration for the V1 Tread. I also took his axle ring as inspiration to make the support requirements a lot more reasonable.

Parts List

When printing, I did not use any supports. The wheel assembly should be printed in a strong UV resistant material. I used PETG-CF. The tread should be printed in TPU, but I have it printed in PLA on mine right now and it has several concrete crossings. While it does not grip the concrete well, it has worked well in the grass / dirt areas.

You only need to print the single print tread or the modular tread. You don't need both!

Eventually I will upload the V1 design as middle rings for the modular design where users can pick and choose which treads they want to use.

Wheel Assembly ( PETG-CF / PETG / ABS / ASA / ETC)

• 2x Navimow Rim.3mf
• 2x Navimow Wheel Ring.3mf
• 2x Navimow Wheel Faceplate.3mf

Tread - Modular Design ( TPU ) 

• 2x NavimowTreadTop.3mf
• 2x NavimowTreadMid1.3mf
• 2x NavimowTreadMid2.3mf
• 2x NavimowTreadBottom.3mf

Tread - Single Print Design (Original Style based of Larsih) ( TPU )

• 2x Navimow Tread V1.3mf

External Parts

• 12x M3 heat inserts
• 12x M3x10mm+ Bolts.
   

Assembly

1. Using a solder iron insert  M3 Heat Set Inserts are heated / pressed into the Navimow Wheel.
2. Press the Navimow Wheel Ring into the Navimow Wheel [Larsih recommends gluing, but I didn't find that necessary].
3. Attach Wheel and Ring to Segway Navimow.
4. Slide tread (either V1 or the Modular top/mid1/mid2/bottom) onto Wheel.
5. Using the M3 Bolts, attach the faceplate to the wheel. 

Future Upgrades

I have a lot of goals for this project. My first priority is to "cut up" Tread V1 and add the middle rings of it so they can be used in the modular design. I want to try out other tread designs (feel free to send them to me) to see if I can get even more traction!

Downsides

The only downside I have found thus far is if you use one of the black crates as a "Garage" for the Navimow, it can barely fit now. If you lift the black crate up a little bit it works fine. 

Wider (48mm)
Heat-Set Inserts to hold wheel cover on.
Different & Modular Style Tread