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Ceramic vs metal grinder - which is better
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Discussions > Espresso > Grinders -... > Ceramic vs metal...  
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CraigA
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CraigA
Joined: 19 Dec 2001
Posts: 11,254
Location: Rexdale, Toronto, Ontario, Canada.
Expertise: I live coffee

Espresso: PID/PressureMod 2001...
Grinder: BUNN FPG-2 DBC, Baratza...
Vac Pot: Bodum Santos manual, Yama 5...
Drip: Behmor BraZen, BUNN VPR-APS,...
Roaster: Refurb Behmor 1600, BBQ...
Posted Wed Sep 5, 2007, 8:18pm
Subject: Re: Ceramic vs metal grinder - which is better
 

JonR10 Said:

Maybe have a closer look at your references sir.  
Tungsten (W) is a metal that light bulb filaments are made from.

Posted September 5, 2007 link

Sorry, my mistake!, & easy enough to do.. I know light bulb filaments are made from it.

Tungsten CARBIDE (WC) is a metal-ceramic compound much harder than any common metal

I've used tungsten carbide cutters, bits, inserts, etc in 3 machine shops every day, but years ago. I'm just too punchy & tired, again sorry., & time to call it a night...

 
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JonR10
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JonR10
Joined: 26 Apr 2004
Posts: 10,376
Location: Houston, Texas
Expertise: I love coffee

Espresso: E61 Legend, Livietta,...
Grinder: Robur, B-Vario-W
Vac Pot: Hario Tabletop, Yama...
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Roaster: 1-lb US Roaster, Behmor 1600
Posted Wed Sep 5, 2007, 8:22pm
Subject: Re: Ceramic vs metal grinder - which is better
 

CraigA Said:

I've used tungsten carbide cutters in 3 machine shops every day, but years ago...

Posted September 5, 2007 link

Here's the REAL question for your experience:  
Is a carbide tool more quiet than a tool-steel tool of the same geometry?  (I honestly don't know)

 
Jon Rosenthal
Houston, TX
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CraigA
Moderator
CraigA
Joined: 19 Dec 2001
Posts: 11,254
Location: Rexdale, Toronto, Ontario, Canada.
Expertise: I live coffee

Espresso: PID/PressureMod 2001...
Grinder: BUNN FPG-2 DBC, Baratza...
Vac Pot: Bodum Santos manual, Yama 5...
Drip: Behmor BraZen, BUNN VPR-APS,...
Roaster: Refurb Behmor 1600, BBQ...
Posted Wed Sep 5, 2007, 8:26pm
Subject: Re: Ceramic vs metal grinder - which is better
 

JonR10 Said:

Here's the REAL question for your experience:  
Is a carbide tool more quiet than a tool-steel tool of the same geometry?  (I honestly don't know)

Posted September 5, 2007 link

Dunno Jon, can't remember., it was 25 years ago.. Over & out. {;-)

 
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gstcyr
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Joined: 21 Jan 2013
Posts: 2
Location: Montreal
Expertise: Professional

Espresso: Aroma SS w/ naked pf
Grinder: Baratza Virtuoso
Drip: AeroPress, Chemex
Posted Wed Apr 3, 2013, 10:17am
Subject: Re: Ceramic vs metal grinder - which is better
 

simply quoting kyle anderson from baratza to answer your question (11+ years of experience in designing coffee grinders):

"Heat and grinding coffee beans: the big misunderstanding

Thermal conductivity of the burrs (i.e. The material they are made from) has NO BEARING on the root cause of heat build up in grinders which comes from a combination of internal friction as the coffee bean is crushed, and from minor friction in the actual cutting of the bean by the burrs. The sharper the burrs ,the less heat is created in the cutting of the bean. The majority of heat creation comes from the crushing of the bean. One could actually argue that the higher thermal conductivity of steel burrs can actually decrease the heat of the ground coffee in small batches. This is because the heat is created IN the bean and is then transferred to the burrs. If the burrs are steel, they will do a MUCH better job of transferring this heat away from the coffee and to the housing of the grinding mechanism. The actual surface temperature of the grinding surface will be similar whether the burr is steel or ceramic, except for that heat which is able to transfer through the burr and away from the coffee. In large industrial coffee grinders, the burrs are mounted to a plate that has water cooling running through it. The burrs conduct the heat away from the beans (and the grinding surface) to the water. A secondary source of heat in ground coffee comes from heat that is stored in the burrs and grinder housing (from coffee ground earlier or immediately preceding) and transferred back into the coffee being ground in the moment."

Bottom-line: Durability is the main difference between steel and ceramic...ceramic will be significantly more durable is not chipped by a rock hiding in coffee beans.

g
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