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Need new motors? Grind a gearbox? Adding teeth to a pinion?
User avatar
By spellow
#147929
so much info on this site, but I can't keep it all straight.

I have a corvette, 7R gearboxes, 1 motor burned up at 18V...so looking to replace them...what is a motor I can but, put the 23 tooth pinion on it and run at 18V safely?

is the Titan the new choice?
User avatar
By Hammer-fm
#147941
I measured the Corvette motors I had at around 19500 RPM at 12V, so you're running around 29k RPM at 18V. A fairly direct match would be these two motors:

http://www.robotshop.com/en/rs-550-motor-19300rpm-12v-6249oz-in.html
http://www.robotshop.com/en/banebots-rs-550-motor-12v-19300rpm.html

The specs are basically almost the same (one is $2.25 cheaper and has a rear shaft, which won't hurt anything; it also is in stock which is a bonus). Biggest gripe is that the front shaft is fairly short; the factory gear will press on and should be ok, but I haven't used this exact motor. You'll want to use some red loctite or other sleeve retainer and rough up the shaft surface. I'm fairly certain it has a fan based on the model name, but the pictures aren't clear; the Banebots one definitely does.

For 20% more speed (but likely even poorer longevity), you could try the 23000 RPM Nichibo motors from Jameco ($3/ea):

https://www.jameco.com/z/KC3SFN-8021F-75-Nichibo-Taiwan-12-Volt-DC-Motor-19455-RPM_2258540.html
(or their ebay link here: Nichibo Ebay link )

I was happy with their performance with Corvette 23T pinions on a PW Mustang, but only ran it at its rated 12V. Buy 4 and plan on replacing them ;).
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