Mikespresso Senior Member Joined: 15 Jul 2012 Posts: 16 Location: India Expertise: Just starting
Posted Fri Oct 5, 2012, 11:05am 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: 8,265 Location: Riverside, Ca, U.S.A. Expertise: I live coffee
Espresso: ECM Vene. A1, La Cimbali M32 Grinder: Azkoyen Capriccio, Major Vac Pot: 40s era Silex Drip: Msl. Com. brewers Roaster: gave it a try, decided no
Posted Fri Oct 5, 2012, 11:25am 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.
In real life, my name is Wayne P. Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!
Feed the newbs, starve the trolls and above all enjoy what you drink!
Symbols: = New Posts since your last visit = No New Posts since last visit = Newest post
Forum Rules: No profanity, illegal acts or personal attacks will be tolerated in these discussion boards. No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum. No SEO style postings will be tolerated. SEO related posts will result in immediate ban from CoffeeGeek. No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum. Who Can Read The Forum? Anyone can read posts in these discussion boards. Who Can Post New Topics? Any registered CoffeeGeek member can post new topics. Who Can Post Replies? Any registered CoffeeGeek member can post replies. Can Photos be posted? Anyone can post photos in their new topics or replies. Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts. Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.