umm.. heat sinks. sorry, we're roookies.....

[sanddrag]

Cooling the motor too fast is bad for the magnets and can crack the brushes rendering it useless. A light bit of spray on the outside is okay but I never get them too cold.

[Joe Johnson]

Originally Posted by sanddrag

Cooling the motor too fast is bad for the magnets and can crack the brushes rendering it useless. A light bit of spray on the outside is okay but I never get them too cold.

We have used the cool in a can stuff for years, freezing the snot out of the motors. While I am sure that it is not particularly good for the motors, we have not had a failure that we trace to this practice in 8 years of competitions.

Joe J.

[Wetzel]

I bet most people here will agree that rapidly cooling the motors will shorten the life span of the motors.
However, the typical use period is still far shorter then the design life of the motor. My dad has a 20 year old drill thats seen alot of use, and still runs fine.

Point being, yes, it is bad for the motor but it won't matter in the time it is needed to work.


Wetzel
~~~~~~~~~~~
Design to meet criteria, don't worry a whole lot beyond that.

[KenWittlief]

Some how I doubt you can cool a motor faster by spraying it will a coolant, than it heats up when the motor is stalled and draws a hundred amps for a second or two without spinning

the coolant isnt that powerfull - its not like a magic freeze ray - when you blast it on something in only looks like it has been instantly frozen because dry ice forms on a very thin layer on the surface.

its neat stuff - a powerfull tool when you need it - get a couple cans and experiment with it to get an intuitive feel for how it works - just dont....um....play with it in any way that can be harmfull or dangerous.

[Adam Y.]

We have used the cool in a can stuff for years, freezing the snot out of the motors. While I am sure that it is not particularly good for the motors, we have not had a failure that we trace to this practice in 8 years of competitions.

One thing that strikes me as dangerous to the motors is that condensation that would develop on something being blasted with that cold air.