dig , how mine works with amps for the berg

[jombo]

i am not too fond of shorting the motors because it puts way too much stress on the esc so this is what i came up with....
here is what i am using for dig, it cuts the amps down and stops the motor but also keeps the amps enough to not make the motor move
you need 2 resistors ,which is radio shack part number


and now to how it works



you also still need the switches the single pole double throw. also on the switched it dosent matter which side is the esc and the motor just make sure the resistor is in the middle so when the switch is activated it goes through the center pins. or for reference do them both the same .
hope this helps

[Kamikaze]

Actualy when you short the motors out the way we are it makes it easier on the esc.

[jombo]

i could not get any of the diagrams to work, i saw the one where you had the positive lead going to the center but when i tryed that killed both motors or gave me free wheel when i switched it around. i can see this method working if you used 2 esc but the way the diagrams show it just kills the positive or negitive and gives dig by the resistance of the motors without a load .
my way still has a load but not enough to turn the motor. i am just showing another way to do it so if others have problems like i do they can do it this way

[Kamikaze]

If you set it up right like the diagram it will completely isolate one motor from the esc all together, effectively halving the load on the esc. Its always good to see options, but for $6 you can't go wrong with the dual dud. Good to see some new tec on the site.

[Robbob]

what about heat? i remember those old Tamiy/Kyosho resistors getting hot to where you couldnt even touch them. i know we're not running full wood like then but would have to think its gonna get hot.

nice thinking outside the box though.

[jombo]

when i used 1 resistor it got warm after about 1 minut but with 2 it dosent even get warm after 2 minuts of use . in the video i had the battery hooked up full load and i could hold the resistors in my hand . i was going to use some transistors but radio shack was out of them,
thanks guys for the kind words

[Kamikaze]

So if the resistor gets warm during a dig, aren't you waisting battery life while digging????

[Robb]

Yes, heat in the resistors would be energy wasted by the batteries.

In the video, the motor is running in "no load" condition (low draw), which should be very different than "full load." Amp draw, or brake horsepower, is based on work produced, in which no load pull would be the minimal of.

[jombo]

yes , this way you dont use the esc transistors as a short and use resistors to dissapate the extra current . this way there is no strain on the electronics. and when the resistors finally die all that will happen is it will give you no more dig just a straight run without dig. in all the videos i have seen no one used dig longer than a minute at a time , i dought these will ever fail unless they shatter on a fall

[Kamikaze]

I don't think you get the dud setup. When you kill a motor with a properly set up dig, you completely remove it from the esc's loop. There is no extra strain on the esc, actually you half the strain on the esc. The dynamic braking that the "dug" motor produces is a closed loop. An electric motor, when forced to turn becomes a generator. This "generation" of current is the power supply to brake the motor, not the esc. Take a closer look at the diagram and you will see.

Try it for yourself. Put a pinion on your motor and spin it by hand, then solder the + and - together and spin the pinion..........

[Robb]

How do resistors die?

[jombo]

yes, i did that and it killes both motors because it fed back , like i said i could not get the other setups to work for some reason.

[jombo]

Originally Posted by Robb

How do resistors die?

i have always had the ceramic break and just leave parts of the wire hanging

[Kamikaze]

You must be wiring it wrong...... no resistors needed, and pre berg......

http://media.putfile.com/100-2923-output

http://media.putfile.com/100-2966

[akguanja]

heh, makes it look so easy anyone could understand it ;D

- tre

[Robb]

This would be how it is wired at a diagram level: