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Modifying Rocky Doserless switch for continuous grind
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Discussions > Coffee > Machines > Modifying Rocky...  
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HB
Senior Member


Joined: 3 Apr 2003
Posts: 2,913
Location: Cary, NC
Posted Sat Apr 19, 2003, 9:34pm
Subject: Modifying Rocky Doserless switch for continuous grind
 

As I mentioned in my post here, one of the disadvantages of the Rocky DL is its lack of a timer.  Here's a simple modification that alleviates some of this inconvenience at very little cost.

DISCLAMER: ELECTRICITY CAN KILL YOU.  IF YOU UNCERTAIN ABOUT WHAT YOU ARE DOING, STOP HERE.  YOU ALONE ARE RESPONSIBLE FOR YOUR OWN SAFETY.  IF YOU CHOOSE TO CONTINUE, YOU ASSUME ALL RISK AND RESPONSIBILITY.  REMEMBER TO DISCONNECT THE APPLIANCE FROM ITS POWER SOURCE BEFORE WORKING ON IT.

Additional caveat: The main on/off switch is a safety feature, as this grinder is nearly silent when running without beans in the hopper.  If you make this modification, be careful that you do not inadvertently leave it on.


As manufactured, the Rocky DL has two switches.  A white main on/off rocker switch is on the right-hand side.  It doesn't start the grinder, but simply enables the front spring-loaded rocker switch.  The front spring-loaded rocker switch actuates the grinder.  As Thomas Gauperaa and others have pointed out, this requires that you hold the switch down for the 20-30 seconds that Rocky requires to grind a double-shot's worth.  The situation is even more penible if you want to grind enough for several shots.  This modification changes the main on/off switch to a continuous grind switch.  The current grind switch continues to work as before, except that it can no longer be "disabled" by the main on/off switch.

These are not step-by-step instructions.  If you need them, you should instead engage a qualified repair technician to do it for you.  Thus this post is (a) an idea, (b) a diagram, and (c) a parts list.  Refer to the diagram next to the attached photo of the bottom of the machine before modification.

All you need is little over one foot of 18AWG wire (or thicker), four female connectors (w/sleeves) and two male connectors.  Fashion yourself two Y wires as shown in the diagram.  Using the extra connectors avoids cutting any wires that were already there should you later want to restore it to original condition.  Solder the Y connection and cover it with heat shrink tubing.  Pay attention to the wire routing to avoid rub points and add extra protective tubing as necessary.  Total cost is around $4.

When you're done, you'll have a leftover "original" wire that connected switch S1 to S2.  Wrap it up tightly and stored it in the base, should you want to restore Rocky to his original condition in the future.

-- Dan

HB: rocky2.JPG
(Click for larger image)

 
www.home-barista.com
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gauperaa
Senior Member
gauperaa
Joined: 22 Dec 2001
Posts: 327
Location: Oslo, Norway
Expertise: I live coffee

Espresso: Euro2000 Junior, Rancilio...
Grinder: Mazzer Mini, Rancilio Rocky,...
Vac Pot: Mini eSantos
Drip: OBH Nordica King of Coffee
Roaster: Imex-CR100, Princess popper,...
Posted Sun Apr 20, 2003, 1:04am
Subject: Re: Modifying Rocky Doserless switch for continuous grind
 

Great post! Maybe I'll try it sometime.

Thomas.
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HB
Senior Member


Joined: 3 Apr 2003
Posts: 2,913
Location: Cary, NC
Posted Sun Apr 20, 2003, 4:17pm
Subject: Re: Modifying Rocky Doserless switch for continuous grind
 

gauperaa Said:

Great post! Maybe I'll try it sometime.

Thomas.

Posted April 20, 2003 link

Hmm-m, I thought you returned yours.  In any case, perhaps you'll find my rendition of a semi-Doserless Rocky interesting.  As shown below, it sports four colorful 58mm dosing containers (they look suspiciously like my kids' snack cups).  Now I premeasure the beans and line 'em up for successive pulls.  I keep one cup in the portafilter holder since Rocky DL tends to "dribble" a little.

BTW, my measures have confirmed that just slightly less than one gram of grind hangs up.  A little tilt forward/back drops the remainder.  After a cleaning, more than three grams gets "lost" in there somewhere.  Those nooks and crannies eventually fill after 4-5 shots; the loss drops to around 0.5 gram w/o encouraging Rocky to give it all up.

-- Dan

HB: rocky-semi.jpg
(Click for larger image)

 
www.home-barista.com
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BlueJackets
Senior Member
BlueJackets
Joined: 19 Mar 2004
Posts: 48
Location: Columbus, OH
Expertise: Just starting

Espresso: Andreja Premium
Grinder: D-less Rocky
Drip: Clarity
Roaster: I-Roast
Posted Wed Nov 10, 2004, 9:45am
Subject: Re: Modifying Rocky Doserless switch for continuous grind
 

I just completed this mod using a slightly different method that some might find helpful.  I used tap splices pictured below (package of 4 for $.99 at Home Depot).  I cut the wire between S1 and S2 in Dan's drawing.  Using tap splices, I spliced the cut end to the wire on S2 to the "Power In" wire and I spliced the cut end of the wire on S1 to the "To Motor" wire.  It took about 10 minutes.

BlueJackets: 032076101008_4.jpg
(Click for larger image)
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Doug_Olitsky
Senior Member


Joined: 27 Dec 2004
Posts: 1
Location: Long Island, NY
Expertise: I love coffee

Espresso: 'Bucks Barista
Grinder: Rocky
Drip: Press & 'Bucks Aroma
Posted Mon Dec 27, 2004, 7:58pm
Subject: Re: Modifying Rocky Doserless switch for continuous grind
 

Here is something that is even easier, plus there are no cut wires, or extra wires. Try using Radio Shack Crimp-On Quick-Disconnects
Price- $1.69
Catalog #: 64-3064

I moved the switches so the main switch is in front and I put the jumper on one of the unused lugs of the momentary switch to keep it in place.

HERE IS THE LINK:

Click Here (www.radioshack.com)

Doug_Olitsky: 64-3064.jpg
(Click for larger image)
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el_cabong
Senior Member
el_cabong
Joined: 11 Aug 2003
Posts: 396
Location: The Land of Enchantment
Expertise: I love coffee

Espresso: Quickmill Vetrano
Grinder: Mazzer Mini,  Rocky
Vac Pot: Hario Deco, Cory ACB-2
Drip: Capresso CoffeeTEC
Roaster: HWP, HG/CIB, SC/CO
Posted Fri Dec 31, 2004, 1:17pm
Subject: Re: Modifying Rocky Doserless switch for continuous grind
 

Just wanted to extend a hearty thanks to Dan for this excellent mod idea. Works like a champ.

The funny thing is that I've scanned over this post and diagram at least ten times, and thought, "It's a good idea, but too bad it wouldn't allow you to use both the rocker switch and the momentary switch..." Two days ago, I finally read the post and realized that it does!

A long time ago a friend of mine introduced me to the the idea of the "elegant" solution. A solution that not only provides an adequate outcome, but the ideal one. This a perfect example of an elegant solution. It adds functionality, without compromising any, and is totally reversible if you ever want to put it back to original condition.

Thanks again Dan.

Joel

Disclaimer: Rocky is not to be used as a ladder.
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ChicagoSandy
Senior Member
ChicagoSandy
Joined: 29 Jan 2005
Posts: 1,192
Location: SW Coast of Lake Michigan
Expertise: I love coffee

Espresso: Quickmill "La Cora,"  Silvia
Grinder: Mazzer Mini, Rocky DL
Vac Pot: Presses, Aeropress
Drip: postnasal, Technivorm
Roaster: Behmor, I-Roast2, SC/TO
Posted Tue Mar 15, 2005, 2:54pm
Subject: Re: Modifying Rocky Doserless switch for continuous grind
 

uh, what about turning off the main switch, duct taping the grind switch in the "on" position, and using only the main switch to turn the grinder on and off? Totally reversible and no chance of electrocution. Ugly, though. (Use black duct tape).

 
Sandy
www.sandyandina.com
-------------------
Life's too short to drink lousy coffee, play crummy guitars and write with ballpoint pens.
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AlanP
Senior Member
AlanP
Joined: 12 Dec 2004
Posts: 103
Location: Bangor UK
Expertise: I love coffee

Espresso: Isomac Zaffiro
Grinder: Rocky
Vac Pot: Cona
Roaster: Hottop
Posted Wed Mar 16, 2005, 3:10pm
Subject: Re: Modifying Rocky Doserless switch for continuous grind
 

Sandy
That's so simple it's absolutely brilliant
Got any tips on turning lead into gold?
Alan
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Passenger
Senior Member


Joined: 11 Oct 2004
Posts: 76
Location: Wisconsin
Expertise: I love coffee

Espresso: Anita
Grinder: Rocky
Drip: Clarity
Roaster: SCGC and Poppery II
Posted Wed Mar 16, 2005, 3:46pm
Subject: Re: Modifying Rocky Doserless switch for continuous grind
 

too easy.
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snoboy
Senior Member


Joined: 4 Jun 2004
Posts: 452
Location: Rossland, BC
Expertise: I love coffee

Espresso: famous Silvia... now PID
Grinder: modded Rocky SD
Roaster: SC/CO
Posted Tue May 3, 2005, 3:36pm
Subject: Re: Modifying Rocky Doserless switch for continuous grind
 

Just did it, easy and elegant... 2 thumbs up to Dan!
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