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As the teacher mentioned finding a 4.5 Module gear is a real problem. I solved the problem by buying an extra gearhead. Remove the cover and remove the first layer of planeteatary gears. A second layer of pinion gears are thicker. They are 4.5Module. I removed one and made a stub shaft that was turned for a press fit with the 4MM hole in the pinion.
The gear ratio on this gearhead is 64:1 reduction. There are three stages of 4:1 reduction within the head.
Unfortunately, as some have noted, the gears are module 0.45 (not 4.5) and it is very hard to find gears with this module, let alone find them in the 18 tooth size needed for the input. One correction to the product description though. This is not an 11mm input gear. It's an 8.1 mm pitch circle with a roughly 8.8 mm OD.
The previous comment that recommended buying an extra gearhead to scavenge the right input gear was a very good recommendation. You can get 6 of the slightly thicker gears and 3 of the thinner gears out of each gearhead. And that's going to be much cheaper than buying a custom made gear. The only challenge is that the gears aren't thick enough to reliably place a set screw, so you do need to go for a press fit onto a shaft. The current hole size is 4mm and I think you could bore it out to 5mm and be OK. Definitely not enough room to bore out to 6mm since the gear root is at about 7mm diameter. So, drill it out to a press fit or a very close slip fit and then use a bearing retaining compound like loctite.
I bought a large number of these to put in kits for a group of middle school aged kids to experiment with. I bought the matching micromo motor which is a fantastic deal for that motor.
A couple things to note. The pinion for that the motors have attached is metric module 4.5...which is nearly impossible to find, so you really need the motors in order to use the gear head at all.
Second, the motors offer a lot of power, but the gearhead planetary gears are not steel. They are either pot metal or aluminum, and really do not match the capabilities of the motor. In low torque situations they are fine and we have used them with good results.
Third, the gearhead is quite loud for a planetary gear. So be aware that if your application need very quiet operation, then one of the other fine motor gearhead combinations offered by All Electronics is probably a better match.
I bought four of these for a 4wd robot platform. These are very impressive with the faulhaber motors they give impressive torque and could be used as direct drive (no pillow block needed) on a 10lb platform. My only complaint is that the output shaft has a bronze bushing not a bearing but that is just a minor detail.
| 100 + | $0.20 each |
| 500 + | $0.15 each |
| 10 + | $0.80 each |
| 100 + | $0.60 each |
| 10 + | $1.25 each |
| 100 + | $1.00 each |
