Re: Rotary table indexer
![Quote](images/misc/quote_icon.png)
Originally Posted by
dnaman
I've noticed that, if I have the motor connected to the indexer but not it's power-supply, when I turn the motor by hand the LCD panel backlight lights up. Presumably the motor is acting as a generator. Is this likely to do any damage? The motor is attached via an easily released connector so it's easy to avoid but I'd like to know anyway.
Absolutely yes!
Most motors when manually rotated will generate a voltage that can exceed safe limits of the circuit and backfeed, destroying unprotected devices. With most motors normally a snubber diode would be used to re-circulate the current so it stops backfeed, but this isn't practical in a lot of cnc applications as this would cause current to continue flowing.
Connect your multimeter to the stepper leads and spin it, you might be surprised by the level of voltage generated.
cheers, Ian
It's rumoured that everytime someone buys a TB6560 based board, an engineer cries!