how fast does your cement mixer run?

jCarroll

Well-known Member
Location
mid-Ohio
Just bought one of the old style mixers (in good shape) at an auction. The motor is 1725 rpm, has a 3" pulley, driving a 14" pulley on the pinion shaft. So the pinion is turning at 370 rpm.

Just seems like the mixer drum is turning faster than it should (needs to). Nothing particularly wrong - just really whirrs.

How fast does your run?
 
I"m using an old Montgomery Wards mixer that will do about a wheelbarrow full per batch. I would guess the drum is turning 20 rpm. I think the motor pulley is 2 inch, maybe smaller.

Bob
 
Mine runs too fast. They won't mix properly if they run too fast, and I suspicion yours is too fast also. Centrifugal force holds the concrete to the drum, rather than letting the paddles stir and drop it as it should. I can't reduce the drive pulley size on mine, so it's time to build a jack shaft speed reducer.
 
I found a 1250 rpm motor at a yard sale, works much better then the 1750 motor that was on it.
 
Never did the calculations but the one I use was way too fast.Pulled the pulley off the motor and took it to the hardware store and bought the smallest replacement I could find.Works much better now.
 
370rpm is way too fast. You should be running 20-30 rpm. Here are 2 electric mixers from Northers Tool and they run 26 and 30 rpm.

http://www.amazon.com/Northern-Industrial-Portable-Cement-Mixer/dp/B001A2VCAO
http://www.amazon.com/Northern-Industrial-Electric-Cement-Mixer/dp/B001A2XHWK/ref=pd_sim_sbs_hi_6

Gilson mixers, which is owned by Marshaltown now, run at 25 rpm. Check out the current models and even look manuals for the older units on their website. http://www.marshalltown.com/Mixers.aspx#

Here is a pulley chart to help you pick new pullies to get the right speed. http://www.csgnetwork.com/pulleybeltcalc.html
 
Thx 4 the Marshalltown link. That gives me "hard data" to use since
mine is a "twin" to their 300 model.
BTW, my pinion turns at 370 rpm, not the drum.
 
Mine will run 64 MPH. :lol:
Bob.
17108.jpg
 
370 is at the pinion, not the drum speed.

What you gotta do is count the teeth on the drum and figure out what the gear reduction is there. 10-tooth pinion, and 120-tooth drum makes for about 30RPM at the drum, which is too fast.
 

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