Using a Bag Motor Without Gearbox

[Coach Norm]

Originally Posted by legogeek24

My question is about bag motors. We want to use a bag motor to run our intake roller, but we don't know how to mount it to a shaft. The obvious choice is a gearbox, but since we're in the UAE, shipping takes a significant amount of time and costs an exorbitant amount of money. Does anyone have ideas for a different way to mount a bag motor to a shaft, like the kit igus bar?

Also, we're not set on the bag motor, we'd be willing to use any of the other kit motors of comparable size (we don't want to use a mini-cim because of weight - it's being mounted at the end of a long arm).

We have never used them before, but I know teams have used drill motors transmissions and electric screw drivers with past KOP motors. Might be something to look into.

I know the Killer Bees, Bomb Squad and Spectrum's John Allen Gregory have had posts and experience with these techniques in the past.

[Richard Wallace]

3620 used a drill transmission for intake in 2012.

Our choice was the classic DeWalt model 940 XRP, mainly because I had some experience with that drill in earlier years. Several teams used it back in the day before such a nice variety of easier COTS gearboxes became available (thank you, AndyMark and VexPro!)

Please look at the classic CD whitepaper "Nothing But DeWalts".

One tip: it will be easier to use a drill transmission if the drill motor you are replacing with a BAG motor has the same shaft diameter (4mm). I have had good results drilling a 9/64" diameter hole in the end of the drill motor shaft to about the depth of the pinion, thereby weakening the shaft just enough so it will deform to let the pinion off.

[legogeek24]

Thanks for the ideas! Due to the unfortunate fact that none of the products mentioned are available locally (and our unwillingness to damage our PG71 gearbox), we decided to just use the mini-CIM or unmodified PG71. It's not perfect, but the best we can do with the resources. Thanks!

[nathannfm]

If you are going to a competition in the states (or anywhere with better shipping rates) you could order the gearbox/motor you want, have it sent to the hotel or a friend in the area a few days early and receive it at the competition. You could look up the mounting pattern and have an interface ready to go, swap out the Mini Cim and you are on your way.