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Discussions > Coffee > Home Roast > Z&D Update  
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PJK
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PJK
Joined: 21 Jan 2002
Posts: 2,314
Location: Shingle Springs CA
Expertise: I love coffee

Espresso: Rancillo Silvia, Tonic...
Grinder: Modified Rocky, Elma side...
Vac Pot: Old Silex
Drip: Melitta BCM 4  +Some old...
Roaster: Hottop, Modified Z&D,...
Posted Wed Jan 14, 2004, 11:00am
Subject: Re: Z&D Update
 

Here is the bottom of the lid with the guide tube.

PJK: RoasterLidWithGuideTube.jpg
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Philip J. Keleshian
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,314
Location: Shingle Springs CA
Expertise: I love coffee

Espresso: Rancillo Silvia, Tonic...
Grinder: Modified Rocky, Elma side...
Vac Pot: Old Silex
Drip: Melitta BCM 4  +Some old...
Roaster: Hottop, Modified Z&D,...
Posted Wed Jan 14, 2004, 11:05am
Subject: Re: Z&D Update
 

This is the top of the lid.  I wish I could have used bounce flash.  I also wish I focused better.  Note the flare in the top of the tube.  I left it because I thought it looks more finished and I thought it would be easier on the thermocouple wire.

Phil

PJK: TopOfRoasterLid.jpg
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Philip J. Keleshian
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,314
Location: Shingle Springs CA
Expertise: I love coffee

Espresso: Rancillo Silvia, Tonic...
Grinder: Modified Rocky, Elma side...
Vac Pot: Old Silex
Drip: Melitta BCM 4  +Some old...
Roaster: Hottop, Modified Z&D,...
Posted Wed Jan 14, 2004, 11:16am
Subject: Re: Z&D Update
 

This picture shows how I passed the heater wires out for connection to the Variac.

Note the duct tape to protect the insulation on the wires.

Please note that I don't consider this the finished configuration.  It is just a development step.

If I continue with the Variac I will have a plug on the roaster into which the Variac will connect and a line cord (properly strain reliefed) from the heater to plug into the Variac.  I am thinking of increasing the heating element to ~ 600 Watts and using an incandescent lamp dimmer to control it.  All that should fit in the base of the machine.

I have some pictures with the bottom cover off showing the connection of the heater leads to the PC board.

Phil

PJK: CoffeeRoasterBottom.jpg
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Philip J. Keleshian
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,314
Location: Shingle Springs CA
Expertise: I love coffee

Espresso: Rancillo Silvia, Tonic...
Grinder: Modified Rocky, Elma side...
Vac Pot: Old Silex
Drip: Melitta BCM 4  +Some old...
Roaster: Hottop, Modified Z&D,...
Posted Wed Jan 14, 2004, 5:41pm
Subject: Re: Z&D Update
 

Here is a better view of the top.

PJK: NewTopView.jpg
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Philip J. Keleshian
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,314
Location: Shingle Springs CA
Expertise: I love coffee

Espresso: Rancillo Silvia, Tonic...
Grinder: Modified Rocky, Elma side...
Vac Pot: Old Silex
Drip: Melitta BCM 4  +Some old...
Roaster: Hottop, Modified Z&D,...
Posted Wed Jan 14, 2004, 5:48pm
Subject: Re: Z&D Update
 

Here is a bottom view with the cover removed.  The wires at the left coming out from under the metal peice are the heater leads.  The other end of the leads are pulled up near the top right of the board.  The little black boxes near the right of the board are relays.  No doubt one is for the roast chamber heater and the other is for the cat heater.

PJK: BottomView.jpg
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Philip J. Keleshian
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,314
Location: Shingle Springs CA
Expertise: I love coffee

Espresso: Rancillo Silvia, Tonic...
Grinder: Modified Rocky, Elma side...
Vac Pot: Old Silex
Drip: Melitta BCM 4  +Some old...
Roaster: Hottop, Modified Z&D,...
Posted Wed Jan 14, 2004, 5:51pm
Subject: Re: Z&D Update
 

This is where the roast heater connects to the board.

PJK: Connections.jpg
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Philip J. Keleshian
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74SOHC
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Joined: 14 Nov 2003
Posts: 54
Location: NY

Espresso: L'el.it
Grinder: Rocky Doserless
Vac Pot: not yet:(
Drip: Capresso Coffee Tec
Roaster: HWG, Z&D
Posted Thu Jan 15, 2004, 6:55am
Subject: Re: Z&D Update
 

Thanks for the pics Phil.

Did you do any roasting with the variac? If so, how did it perform? I'm just wondering what would be better, a new heater with dimmer, or the variac route.....

Thanks,
Scott
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,314
Location: Shingle Springs CA
Expertise: I love coffee

Espresso: Rancillo Silvia, Tonic...
Grinder: Modified Rocky, Elma side...
Vac Pot: Old Silex
Drip: Melitta BCM 4  +Some old...
Roaster: Hottop, Modified Z&D,...
Posted Thu Jan 15, 2004, 4:44pm
Subject: Re: Z&D Update
 

Hi Scott,

I have done several roasts with the Variac.  Last night I roasted some decaf Colombian from Costco for my wife.  (don't laugh after resting overnight, this stuff smells good enough to tempt me to be a decaf drinker)

This time I filled the chamber to the normal fill line.  I did preheat the machine.

I did the clone of Jim's Hot-top clone.

I have an old Graylab darkroom timer.  I put peices of tape around the clockface with the temperatures on them.  As the hand on the timer approachs a new temperature I turn the Variac knob up or down depending how far I am from the desired temperature and the rate at which the temperature is moving.

I was able to come real close to his profile except the very begining.  This was a funny story.  Since this is a new setup and I am still in the learning curve I had my DVM hooked across the heater.  The digits on the DVM are about the same size as those on the thermometer.  At the start of the roast  I turned up the Variac.  The temp didn't seem to be ramping fast enough.  I turned it up full.
I read about 136 and it was holding steady.  I then realized I was looking at the DVM, not the thermometer.  I turned down the Variac and bumped the hand on the Graylab up to match the 250 degrees on the thermometer.  The rest of the roast proceded on schedule.

I would say that if you don't mind one extra peice of equipment in your setup, there is no reason not to use the Variac.  My rangetop is getting crowded with the Z&D, the HWP for bean cooling, the thermocuple meter, and the Variac.  The crowded setup is what is prompting me to look at a higher wattage heater and lamp dimmer.

The Z&D load of beans turns out to be a large load for the HWP.  After getting the beans into the HWP and starting the cool cycle in it, I have to pick it up and rock it in a cicular motion to keep the beans agitated.

Let me know how you make out with your machine.

Phil

 
Philip J. Keleshian
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jim_schulman
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jim_schulman
Joined: 19 Dec 2001
Posts: 3,772
Location: Chicago
Expertise: I live coffee
Posted Thu Jan 15, 2004, 6:22pm
Subject: Re: Z&D Update
 

Wow! I didn't think the Z&D was this hackable. With good cooling, and a decent profile, this should be a superb roaster, since the augur system does such beautifully even roasts.

You've definitely made your "hard core home roasting" bones!

 
Jim Schulman
www.coffeecuppers.com
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74SOHC
Senior Member


Joined: 14 Nov 2003
Posts: 54
Location: NY

Espresso: L'el.it
Grinder: Rocky Doserless
Vac Pot: not yet:(
Drip: Capresso Coffee Tec
Roaster: HWG, Z&D
Posted Thu Jan 15, 2004, 9:57pm
Subject: Re: Z&D Update
 

I think a variac would be nice...then I can use it on the gourmet as well. I thought it was gonna cost me an arm and a leg....but when doing some searching on Jims hot top clone....I came across all kinds of posts..and found his review of the krm 590 from coffee bean corral. ...too bad I just got an order from them not too long ago. But, I guess I'll need more green beans sooner or later right?

My girlfriend already thinks I'm nuts...but she loves the fresh roasted beans.  The other night, I caught her sneaking off with the french press and some beans that she just ground up. She was off to a meeting and couldn't bear the thought of having to drink the coffee there. I just chuckled and called her a snob....she replied that she's not a snob, she's just spoiled now......


But I agree with Jim....the Z&D does roast very evenly...and will be even better with using a good profile.

Thanks guys,
Scott
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