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Misc / Amazon seeks exemption to test drone deliveries
« Last post by Admin on July 27, 2014, 02:10:56 PM »
I thought it was just a big PR stunt . . . but it appears Amazon might actually be serious about drone deliveries . . .

http://www.computerworld.com.au/article/549795/amazon_seeks_us_exemption_test_delivery_drones/
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Electronics / Re: Problems running motors with sabertooth
« Last post by jkerns on July 27, 2014, 07:27:39 AM »
If you are running 35 amp motors through a 25 amp drive, it is likely that the driver is overheating and shutting down.

Too small wires will have a voltage drop across them and waste power and in the worst case melt the insulation, but they would not typically cause the symptoms you describe.
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Need help in just about everything related to robotics,
Thanks.
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Software / RTC on axon
« Last post by the_edge123 on July 27, 2014, 04:11:33 AM »
I'm interested in getting the axon2.
I would like to know if the RTC is enabled to timestamp sensor data.

--
Fabien
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Electronics / Re: Problems running motors with sabertooth
« Last post by Tommy on July 27, 2014, 03:12:36 AM »
Quote
I'm running two 24V 35amp motors with a Sabertooth Dual 25A
maceliz, something seems wrong with the above line(using 25A drive with 35A motor?)
do you have a model or part number for the motors your using?

Tommy   
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Electronics / Problems running motors with sabertooth
« Last post by maceliz on July 26, 2014, 09:19:58 PM »
I'm running two 24V 35amp motors with a Sabertooth Dual 25A 6V-24V Regenerative Motor Driver connected to a remote controller and it is working fine but after some minutes the motors stop, my assumption is the wiring is getting to hot as I can feel it and are not allowing the current to flow but I'm not sure.

If I wait some seconds the motors work fine again.

I'm using 12 gauges wires and planning to change it for 8 gauge wires?

Do you think I'm doing the right assumption or might be something different?

Thanks
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Electronics / Re: Airsoft robot fireing system
« Last post by DiegoChavez on July 25, 2014, 07:39:57 PM »
bdeuell that is a great idea. I was thinking of using a sabertooth but that seams easier and cheaper. It is also smaller.
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Mechanics and Construction / Re: Need help finding the pitch of a pinion gear
« Last post by bdeuell on July 25, 2014, 02:18:54 PM »
you could always heat your gear up before you press it on to help reduce the press fit force required, might make enough of a diferance but i wouldnt count on it. This can help when disassembling as well if you dont care about saving your existing motor.

If you do use epoxy a rough surface will be tour friend, you could scuff the surfaces with some sand paper before gluing.


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Mechanics and Construction / Re: Need help finding the pitch of a pinion gear
« Last post by jkerns on July 25, 2014, 08:12:30 AM »
I've had good luck with plastic gears.

Brass is not as flexible and would need to be fixed in place with epoxy.
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Electronics / Re: battery pack charger - DIY
« Last post by waltr on July 25, 2014, 07:47:47 AM »
Did you do a search on how to properly charge NiMh batteries?
There is lots of info on the proper sequencing on controlled current and Voltage.

And yes, building your own charger can be done. It just needs to be done properly else you either just kill the battery and/or start a fire.
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