# Project HoverArm

**URL:** <https://discourse.odriverobotics.com/t/project-hoverarm/441>\
**Category:** Projects\
**Created:** [February 1, 2018, 10:25am UTC](https://discourse.odriverobotics.com/t/project-hoverarm/441 "2018-02-01T10:25:10Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![madcowswe](https://discourse.odriverobotics.com/user_avatar/discourse.odriverobotics.com/madcowswe/32/1138_2.png) [@madcowswe](https://discourse.odriverobotics.com/u/madcowswe)\
**Post date:** [February 2, 2018, 10:04am UTC](https://discourse.odriverobotics.com/t/project-hoverarm/441/9 "2018-02-02T10:04:55Z")

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## Cooling

 ![image](https://discourse.odriverobotics.com/uploads/default/original/1X/7e5aae9454fef48ef62be5e67b739371ba9817ad.jpg)  
If you look closely at the stator, you can see that it has an airgap all around it, except for the connection to the shaft.

 ![IMG_20180122_224902](https://discourse.odriverobotics.com/uploads/default/original/1X/814bb52779bd16c84835133415fdab71ea77e403.jpg)  
But even there, actually, it’s pretty much air-gapped.

This means that by default, the cooling of the coils will be very poor. I think in the original application there was not so much that could be done since the motors needed to be sealed against water and dirt ingression.

### Drillin’ Holes

 ![IMG_20180130_103208](https://discourse.odriverobotics.com/uploads/default/original/1X/f70a004a8dd4163fe703791ddac7a610b4031031.jpg)  
Let’s get one thing straight, stepped drill bits are awesome.

 ![IMG_20180130_104134](https://discourse.odriverobotics.com/uploads/default/original/1X/ab45d64d66e33e03ca6c2880d243f1e8ce8fed2f.jpg)  
Yep, looks like some air will get to the stator.

 ![IMG_20180130_103401](https://discourse.odriverobotics.com/uploads/default/original/1X/711bcbc131240de1423ca45f4a9967470c18c77b.jpg)  
I did a test-print, and it’s starting to look less like a hoverboard wheel and more like… I don’t know what, but not a hoverboard wheel. Looks cool though.

 ![IMG_20180130_111505](https://discourse.odriverobotics.com/uploads/default/original/1X/06a28ba033ea75b43c668c89f13e4a5e1890143c.jpg)  
On the other side where there is no starfish, we can make big holes! Next time I would probably put them slightly further out. I doubt it makes a huge difference though.

 ![IMG_20180130_112144](https://discourse.odriverobotics.com/uploads/default/original/1X/c4977368b4783dfa3bea4ac1d6568fd90aa50c17.jpg)  
Since the wheel should only spin a couple of turns, we could even add a fan here. This fan is just for illustration, it is completely the wrong size. Not sure how I would attach one, maybe just glue it?

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