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I contacted RENDS directly about getting replacement motors for the A-10 Cyclone as I am now unwilling to buy a new one every few months. They basically blew me off which is silly as they could have sold it to me for $50 and I would not have batted an eye. Now I know better. Since I have several to play with, I decided to find a suitable replacement and post that information for those folks that are handy. It ain't rocket science.The original motor is made in China and is a Suntech Development Company Ltd Model #360G-1 with a working voltage of 6V Speed of 100 RPM unloaded and a stall torque of 10.3kgf.cm. In laymens terms, it's a pretty common motor and gear system. I could get them for a buck or 2 a piece if I wanted to by in quantities of 10 thousand or more. To see how close to this I can get in this country I sent one of the broken motor assemblies to a Electronic parts store. I'll report what they say. 3 C Cells equals 4.5 volts. Most hobby motors work in the 3-6 volt range. The only tricky part is the gear assembly which seems to be about a 100:1 ratio for reduction. These motors are sold by Science Supply shops and hobby stores that cater to the robot builder - which includes Car and Boat models. The closest that I've found (and they are pretty close) run about $15 and come in 100:1 300:1 and 400:1. ratio's As the ratio increases the torque is higher and the speed goes down. At this price the gearing is metal and the motor a bit smaller. Conversion is easy, I drill two new holes and screw it in. I'll put the motors in a 1 inch sleeve and size will be perfect. I've ordered 2 of each motor and since I have 2 broken units give them a try. I'll report the results after I try it out. I won't solder, instead I will use standard crimped connectors.The other improvement I suggested was to have the wire path through the side rather then the top of the handle and I'll be adding some foam for noise and I'm still thinking about cooling. Then I can work on ways to hold it in position hands free. .My next thing is to put it on a transformer and go from a wall outlet to a steady 4.5 volt C Cell replacement. What honked me off is that they told me that they could not sell me a motor for safety reasons. 3 C cells doesn't provide that much juice. The Canadian motors seem to run cooler, just as much torque and real metal gears. So, maybe we do have an alternative. ( http://www.solarbotics.com/products/gm20/ ) If not, just use the parts and PVC piping. And it looks like they are considering a stand alone A10 version 2.
I have a horde of motors on the way. The latest test subject is made in America has the exact dimensions and seems to do exactly what I want. I also ordered a AC-DC 5V converter.A more exact replacement might be : DC Motor: High Torque Mini 12V DC Gear Motor, 50 rpm for Hobby Projects MT-050or DC Motor: High Torque Mini 12V DC Gear Motor, 200 rpm for Hobby Projects MT-200 (in case I don't get the torque on the first one at 5V) from http://www.batteryspace.com/dcmotorhightorquemini12vdcgearmotor200rpmforhobbyprojects.aspxNote that all of these all metal gear replacements run less than $15. Rends could have sold the actual cheaper Suntech motor for $25 and made money. God, I do love capitalism.
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