Flip - 21-6-2006 at 23:45
Let's say that I have everything but the motor for an overhead stirring setup. So here's my question... once I get the motor, what's the best way to
secure the motor atop the flask? How is it done in the setups that come with the motor?
Extra points for ideas that involve securing it to the flask.
I appreciate your help, guys.
flip
Twospoons - 21-6-2006 at 23:56
I'd use a plain old lab stand and clamps, since I've got them. You don't have these?
Flip - 22-6-2006 at 00:37
I've got stands and clamps, but I don't have a stand that's tall enough or a clamp that's long enough 
[Edited on 6/22/06 by Flip]
DrP - 22-6-2006 at 03:07
You need a big sturdy retort, or better still, build a secure sturdy framework in the back of your fume cupboard to clamp things to.
leu - 22-6-2006 at 06:21
Weld an iron rod onto the motor case at right angles, that's the easiest solution 
Flip - 22-6-2006 at 10:02
I think that's the best idea yet, then perhaps a stand could be built from wood. Thanks.
Ok so a couple more questions on shaded pole motors:
How would the glass stir rod be fixed within the motor, some motors seem better suited to this than others? With some of these motors, I don't even
know how it could be done at all (securely).
Does anyone know of a commercially availiable adjustable speed motor so a variac would not be neccessary?
What types of shaded pole motor are most suitable for overhead stirring?
What might be the range of rpm that wouldn't risk busting (too many) stir rods in a viscous solution?
And here's a "ghetto" idea, what about a fan motor, like from a ceiling or portable fan?
[Edited on 6/22/06 by Flip]
Twospoons - 22-6-2006 at 15:22
To connect the stir rod to the motor use a short, tight length of silicone or rubber tube. For extra security add a drop of superglue on rod and
motor shaft. This does however mean the stir rod will need its own bearing (a hole in a piece of wood would do), and the floppyness of the rubber
tube will allow for some misalignment of motor shaft and stir rod.