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Thread: Gear reduction grinders

  1. #1
    Senior Member Yelta's Avatar
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    Gear reduction grinders

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Gear reduction grinders

    "Gear reduction grinders work with a set of gears that turn the speed of a high-speed motor into slow-speed burrs with the power to grind without getting bogged down, even on a very fine grind."

    I've been wondering about the reliability of these grinders as opposed to direct drive, seems to me that gearing introduces another level of mechanical complexity that may eventually cause problems or fail.

    What are the thoughts or experiences of others re geared V direct drive?

  2. #2
    Senior Member Vinitasse's Avatar
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    Both my grinder and my roaster have gear reduction boxes. Both have motors spinning at 1380 rpm and the grinder is reduced down to 350 rpm while my roaster runs at just 46 rpm. Both gearboxes are stilling running perfectly. As a case in point, the roaster has done a few thousand batches and even with high ambient temps around the gearbox it has never had a hiccup and I expect it to still be running just fine many years down the road as well. They build these things super strong after all.

  3. #3
    Senior Member Yelta's Avatar
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    What type of grinder do you have? the only geared grinders I've seen are those using nylon/plastic gearing, they don't seem all that durable to me.

  4. #4
    Member ASchecter's Avatar
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    Quote Originally Posted by Yelta View Post
    Gear reduction grinders

    I've been wondering about the reliability of these grinders as opposed to direct drive, seems to me that gearing introduces another level of mechanical complexity that may eventually cause problems or fail.

    What are the thoughts or experiences of others re geared V direct drive?
    Mazzer Robur has a gearbox -- very reliable.

  5. #5
    Senior Member Yelta's Avatar
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    Quote Originally Posted by ASchecter View Post
    Mazzer Robur has a gearbox -- very reliable.
    They certainly have a good reputation.

  6. #6
    Site Sponsor coffee_machinist's Avatar
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    Any large conical grinder will have a reduction gearbox, generally they spin at about 400 rpm compared to the 12-1300 of a flat burr. They are generally planetary type gearboxes so it is nigh on impossible to break them, as three pairs of teeth are constantly meshing. I rebuilt a Robur that had attempted to grind a stainless bolt, it bent the rotor burr mounting shaft (12mm steel) but didn't shear off any teeth or wreck the motor.
    ASchecter likes this.

  7. #7
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    Gear reduction grinders

    La San Marco conical is geared down to 400 rpm. I've never seen any issue

  8. #8
    Senior Member Vinitasse's Avatar
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    Quote Originally Posted by Yelta View Post
    What type of grinder do you have? the only geared grinders I've seen are those using nylon/plastic gearing, they don't seem all that durable to me.
    I have a La San Marco SM TK

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    Gear reduction grinders

    Good choice Vinitasse ;-)

  10. #10
    Senior Member Yelta's Avatar
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    Quote Originally Posted by Vinitasse View Post
    I have a La San Marco SM TK
    Hmmm, have to admit ignorance to the brand name, an obvious gap in my coffee education

    Google tells me it's an impressive high end conical, check out the quality .pdf http://www.lasanmarco.it/media/broch...7_LK_TK_UK.pdf I imagine the retail of almost $2k would seriously limit the number of home owners.

    Nice to see something at the top end after what seems to be a constant diet (lately) of Sunbeam and Breville appliances.

  11. #11
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    Gear reduction grinders

    It's a commercial conical, very few people would want something that large at home. It's a ripper grinder though, I wish I had the bench space at home, just have to resign myself to using it at work

  12. #12
    Senior Member Vinitasse's Avatar
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    I'm lucky in that my home and my roastery share the same address and therefore any toys I buy for work also end up being toys for home

  13. #13
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    Gear reduction grinders

    Once the kids grow up Im sure ill have a lot more space for toys.... Just 16 years to go

  14. #14
    Junior Member proftournesol's Avatar
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    I have a belt drive Versalab that uses gear reduction. The coffee is great, the belt is very reliable, it slips if there's a stone in the grinder (preferable to grinding away the burrs), otherwise it's faultless.



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