Variable speed lab mixers at Amazon.com

Saturday 1st December 2018

You need variable speed (not constant speed). Although some have timers these are not useful. The prices range from $100 to $thousands. They do not always come with the shaft and propeller (but it is easy to get a stainless steel shaft). A table-top device may be rated at 20L capacity, for example, but that is for thin liquids. For thick ceramic slurries, it likely will only handle 8-10L (if the propeller is suitable). Double check and question the RPM rating, the cheap mixers use stepper motors (they require minimal electronics) and only get a fraction of the claimed RPM (so they will obviously not mix slurries well enough). These mixers will only be useful with a large propeller having steeply pitched blades. Buying a propeller is not practical because one will likely cost more than the mixer, be the wrong pitch, wrong direction, wrong size. 3D-printing one yourself is the best way (keep reprinting until it works well). If the shipping weight of the package is 15-20 lbs much of that will be the heavy metal base.

Pages that reference this post in the Digitalfire Reference Library:

Make a useless Amazon mixer useful with a 3D printed propeller, Propeller Mixer

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