Denso Window Motor

So, I took a look at the window motor we got in the KoP this year, and it’s a little different from what we’ve got in the past. Has anyone found a reliable way to attach to the output (like the hubs we had for the old ones)? What about mounting it? There are some apparent mounting holes, but they don’t go all the way through, and tapping them didn’t really seem to work out so well.

Honestly, I looked at those motors and sighed. Then tossed them back in the tote and that’s where they are still.

Kind of a shame really, I’m not sure how good the motors themselves are? But they sure don’t seem like they want to back drive

Of course not…they’re window motors. You wouldn’t want someone to be able to slide down your car window, would you?

Just wishing they had an output shaft that was a bit more user friendly.

Sounds like a good application of a 3D printer. Print some hubs?

SenorZ Honestly, I looked at those motors and sighed. Then tossed them back in the tote and that’s where they are still.

We were also very disappointed in the new kop window motors. We also just tossed them back into the tote. We are using the old type window motors on our robot this year, but we need more of those black hubs that fit onto the output. I have scoured the internet to try and find them, but they are nowhere to be found. Does anyone know where to buy them? Any help would be much appreciated.

If you have other local teams nearby ask them they may be able to loan you one

You can print this if you have a good 3D printer

Unfortunately that won’t work on the 2016 KoP Denso motor.

Last year we used 3/4" 12 point sockets. It fits the spline output pretty close and if you want it to stay put carefully add a little Liquid Steel or epoxy. Gives you a nice 3/8" square output. We drove lead screws with them.


Not knowing what and how you plan to use this for limits responses.

We 3d print many adapters for the Denso motors. They work quite well depending on loading. If there is going to be shock loads you would need to use metal and bearings with supports so the transmission doesn’t take the abuse.

Depending on output needed you can…

CAD an adapter and have it 3D printed. - Many local teams can help with this, even us if you need.
Take a hex axel and mill it down, cut some groves on either side of the output for an “E” clip. Or drill out the end and tap it for a retaining bolt and washer.

From a quick look at this motor in CAD the opening is .238 which is roughly 15/64th…
Which is one step down from 1/4".

If you take a 1/4" hex shaft it will require very minimal grinding / milling to get it square enough to fit. Then use an adapter to get to the require output size.

Post a little more what you plan to actuate with this motor. 1/2" hex, sprocket, pulley, etc.

We have used Denso motors every year since our rookie year. This might be our first year NOT needing to use one.
We do have lots of experience using these window motors and would love to help you integrate them into your design.

Good luck,


Not knowing what and how you plan to use this for limits responses.

We will be driving plate sprockets using the bolt circle. They will be taking heavy load. We are going to be getting about 400 oz-in of torque out of the motor and we are supporting them on the opposite end with a 1/2" shaft so they are not cantilevered.

You can print this if you have a good 3D printer

Thanks for the link! I think I will try it at practice tonight. We need the bolt circle but I can easily modify the cad for that. I am a little concerned about 3D printing them though. We have a mediocre 3d printer that is capable of making them, but they will be taking heavy load. Do you have more experience in this in order to know if 3d printing will be strong enough for high-load applications? (We have only used our 3D printer for parts once before I was on the team and I was told they broke)

If you have an older 3d printer you are more than likely printing with PLA. We have done some heavy loading with PLA but you have to make them very think, print as a “solid” (which it really isn’t) and have many replacements because they will break under match conditions.

In my opinion for a heavy load you are better off making your own axle out of some metal stock. Especially if you are considering hanging your robot from this motor. It is meant to hold up a car window roughly 20 lbs, depending on the car.:slight_smile:

I think making a 1/4" axle with a 1/4" to 1/2" hex adapter would be a good solution. Also you will be better off putting a bearing on both sides of the axel.

Such as the 1/4" hex axle comes out of the motor. Then the hex adapter, support structure with a 1/2" hex bearing, rest of the 1/2" axle connected to whatever, then the other support and 1/2" hex bearing.

Hope this made sense,

Looking forward to some pictures of this mechanism.

Good luck with this, keep us informed.