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La San Marco SM 92 Grinder Question
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AustenRabbit
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Joined: 26 Mar 2014
Posts: 7
Expertise: I live coffee

Posted Thu Apr 3, 2014, 2:05am
Subject: La San Marco SM 92 Grinder Question
 

Hello, I have bought a used La san marco SM 92 grinder, it was lightly used from the looks of it. Though I dont have an idea of how much coffee was ran thorough it. The doser has a counter on it for everytime you pull a dose The one I have bought only has 1300 pulls on the dose counter. My grinds are coming out abit clumpy, also the burrs looks a little rough on the edge of the blades, but they feel abit sharp. Getting burrs for this machine is more of a task, but it would seem so silly to have to replace them after 1300 doses worth of beans. The burrs are 64mm flat, normal 3 screw mounting. My question is, is 1300 doses alot? and could i use burrs that are 64mm flat that are not made by San Marco? Thanks!
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emradguy
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emradguy
Joined: 31 Mar 2011
Posts: 3,157
Location: Houston
Expertise: I live coffee

Espresso: Duetto II; Twist v2
Grinder: M Major, Macap M4, Pharos,...
Drip: Espro presses; Aeropress
Roaster: H-B "List of Favorites"
Posted Thu Apr 3, 2014, 6:37am
Subject: Re: La San Marco SM 92 Grinder Question
 

first off…1300 doses is a very small number.  For sake of argument, let's figure 20g/dose (which is likely high).  That's 26000g, or 26kg.  It's probably safe to assume the burrs are rated for 400kg or more. So basically, the burrs would be in excellent condition if you could trust that the dose counter has anything to do with how many doses were ground.  But, you can't trust that. It would be akin to believing that a magician actually could make someone disappear, or saw someone in half. The doser counter only reflects how many times the doser lever was pulled - that's all. In my home, I single dose my Major, and if I use a hopper (like, with my Macap M4) I dose as it's grinding...so for me, I pull the lever nearly 20 times, just to make one double. IF and this is a big if, the doser lever was only pulled once for a single and twice for a double, then it might have some meaning to look at the counter, but unless one is operating in a really busy cafe, the lever was likely pulled several more times for each dose.  And at the end of the day, the lever was likely pulled many times to clean the doser out (if the baristi working in the cafe cared at all about staleness). Given your description of the burrs, that counter has turned over to 0 at least 20 times…probably many more than that, in it's life.  Also, given 1) your description of the burrs, and 2) the fact that you don't know their life, you should just go ahead and replace them.

Look on the badge and see how old the machine is, the manufacture date should be there, but sometimes they are embedded in the serial number, like the leading 4 digits are the manufacture year.  I'm sorry I don't know who carries the burr set for that brand, but maybe the Mazzer Super Jolly burrs fit?

 
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Always remember the most important thing is what ends up in your cup!
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AustenRabbit
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Joined: 26 Mar 2014
Posts: 7
Expertise: I live coffee

Posted Thu Apr 3, 2014, 11:26pm
Subject: Re: La San Marco SM 92 Grinder Question
 

Thanks for the reply. My mind never crossed that the counter will reset once it reaches it limit haha. Anyway I measured the burrs and they are roughly about the same measurements as the Mazzer Super Jolly. I will just need to borrow a friend's and compare them both. The manufacture date was 04/20/2013 surprisingly.. so this grinder had a short cafe life. Here is a quick picture of the burrs: http://i.imgur.com/T1PBgOA.jpg http://i.imgur.com/5AFX2Mr.jpg
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,853
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
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Vac Pot: 40s era Silex
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Roaster: gave it a try, decided no
Posted Fri Apr 4, 2014, 5:56am
Subject: Re: La San Marco SM 92 Grinder Question
 

Yes, the counter is moot. It counts how many times the handle was pulled but it may be pulled 2, 3, 4 or more times for each shot depending on how it was used. In a business it helps the owner from day to day to kinda get a count on things but it has no value with usage in it's life but then you knew this by the above post anyway :D

 
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Wayne P.
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Feed the newbs, starve the trolls and above all enjoy what you drink!
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skydragondave
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Joined: 18 Feb 2013
Posts: 167
Location: Ontario, Canada
Expertise: Professional

Espresso: Commercial Only
Grinder: Commercial Only
Roaster: Has Garanti HG5
Posted Sat Apr 5, 2014, 8:07am
Subject: Re: La San Marco SM 92 Grinder Question
 

You can't just go by the ID, OD and thickness of the burrs, you have to also know the bolt circle diameter which is never listed in the catalogues so you can only go by make and model. You will also need to know which direction the burr teeth are oriented either clockwise or counterclockwise. Those burrs look fine to me anyway you'd have to grind a lot of coffee to wear out a burr set in a year.
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