3mm motor output shaft to 5mm

[maxPOWAAA]

I am running a hobbywing 3656 motor and the output shaft is only 3mm but needs to be 5mm for most pinion gears. I have the adapter but even with locktight I managed to spin to adapter on the output shaft. I am thinking a more permanent solution will be necessary. Maybe something like jbweld?

What other options would I have?

 

[ninja turtle]

What pitch and tooth count do you need?

 

[maxPOWAAA]

It's stock gearing in an axial yeti which I belive is 16/64? I am not sure if that is going to give me the top end I am looking for so I might be switching it down the road

 

[Trubble]

Robinson Racing #1716 doesn't fit?

Or the 0160?

 

[k7zpj]

It's stock gearing in an axial yeti which I belive is 16/64? I am not sure if that is going to give me the top end I am looking for so I might be switching it down the road

Axial has 32P 3mm pinions in tooth counts from 11t. thru 17t. No adapter required. The part numbers are listed below.

AX30722 Pinion Gear 32P 11T (3mm shaft)
AX30723 Pinion Gear 32P 12T (3mm shaft)
AX30724 Pinion Gear 32P 13T (3mm shaft)
AX30725 Pinion Gear 32P 14T (3mm shaft)
AX30726 Pinion Gear 32P 15T (3mm shaft)
AX30727 Pinion Gear 32P 16T (3mm shaft)
AX30728 Pinion Gear 32P 17T (3mm shaft)

 

[maxPOWAAA]

Great thanks!! I'd rather not permanently modify the shaft so those are a great option. Now, if I want to gear it for more top end, which pinion and spur should I get?

 

[Trubble]

Larger pinion on the motor and/or smaller spur will get the top end up.

Monitor motor temps and keep them below (imo) 160ish°.

 

[maxPOWAAA]

Are all sizes of spurs and pinions interchangeable or do they run in sets? Like can I run a 68 or a 48 spur on the same 16 pinon?

 

[k7zpj]

Are all sizes of spurs and pinions interchangeable or do they run in sets? Like can I run a 68 or a 48 spur on the same 16 pinon?

As long as the pitch is the same, different size spurs and pinions will mesh.

In picking a spur/pinion gear combo, the first step is to figure out which gear ration you want to run. For example with a 4:1 gear ratio, you have the choice of the following spur/pinion combinations 68/17, 64/16 60/15, 56/14, 48/12. These all produce the same ratio. (I just listed the combo that came out evenly with a 4:1 ratio, there are other sizes in between the ones listed)

Then you pick the combo that results in the motor screws being located approximately in the middle of the motor mount. You want to avoid combos that put the mounting screws too close to the ends of the slots in the motor mounts. When decided between two combos, I usually go with the one with the biggest spur gear.

 

[maxPOWAAA]

Which combo is going to give the most top end with a 4:1 ratio? Or am I better off running a 3:1

 

[k7zpj]

Which combo is going to give the most top end with a 4:1 ratio? Or am I better off running a 3:1

The optimal gearing for your rig is effected by lots of variables like weight of your rig, the surface you are running on and even how you drive.

I would start out with stock gearing and run the rig 5 to 10 minutes so see how the temps are. I use a low cost thermometer gun. You don't want the temps to exceed 160F. If you don't have a thermometer, put you finger on the motor and see if you can hold it there for 3 seconds. If not, then it is too hot.

Based on your initial temp readings you then either increase or decrease your pinion size. If the pinion size is on either end of the available size then you increase or decrease the spur as needed.