Mikespresso Senior Member Joined: 15 Jul 2012 Posts: 16 Location: India Expertise: Just starting
Posted Fri Oct 5, 2012, 10:05am Subject: Any engineers here...
I was wondering in a flat burr coffee grinder what is it that allows the plate on which the lower burr is attached (the one that rotates) to rotate freely and not touch the fixed structure below it (through which the motor shaft passes). Is there a bearing that is used for this purpose. If anyone knows about a site that has actual pictures of the complete design of a coffee grinder, from the point of view of an engineer, please share the same. I'm just curious on how coffee grinders work exactly and am kind of researching this. Also, would anyone know the range (in rpm) at which most flat burrs rotate, not the rpm of the motor but rather that of the bottom burr.
calblacksmith Moderator Joined: 25 Nov 2007 Posts: 6,905 Location: Riverside, Ca, U.S.A. Expertise: I live coffee
Espresso: ECM Veneziano A1 Grinder: Many different commercial Vac Pot: 40s era Silex Drip: Milita, Bunn&Curtis... Roaster: Cast iron pan, gas burner
Posted Fri Oct 5, 2012, 10:25am Subject: Re: Any engineers here...
Just look on the internet for parts of the grinder of your choice and most parts houses have full diagrams of all parts. Yes there are bearings, the most common design is a long shaft on the motor. The motor is fixed in the housing and the long shaft extends to the grind chamber and there is often a bearing where the shaft passes through the housing, the burr is attached to the output shaft of the motor so whatever speed the motor turns, the burr turns the same speed. I am sure you might be able to find an example that differs from my statement but for most designs that is the way they are made.
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