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Discussions > Coffee > Home Roast > Z&D Update  
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,317
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 Sat Nov 12, 2005, 11:22am
Subject: Re: Z&D Update
 

Hi Mark,

Thanks for the comments.

Sometime back while I was ordering a chaff screen or something from Lisa at Z&D I mentioned this string and recomended  that she check it out.  I think at the time I just had the thermocuple probe installed and the roaster leads coming out of the case.  It was primitive, but it worked and the concept of a higher power roast heater and temp probe in the roast chamber were there.  I don't know if she checked it out or not.

It could be that their liability lawyers saw it and went into spin-dry.

I believe that if they were to put a temperature probe into the roast chamber and replace the 400 watt roast heater with a 700 watt heater controlled with a phase control lamp dimmer, they would have a machine which Coffee Geeks would be lineing up to buy and it wouldn't cost them much.

Phil


CoffeeSmurf Said:

Wow Phil those are some extensive mods!  Have you considered sharing your ideas with Z&D for their someday next generation roaster?  

Thanks a lot for sharing your ideas and hard work!

Regards,
-Mark-

Posted November 11, 2005 link


 
Philip J. Keleshian
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,317
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 Jun 21, 2012, 1:57pm
Subject: Re: Z&D Update
 

This is the latest update to my Z&D.  Since I started with this thing I have been boosting the voltage to the roast heater to get a faster temperature vs. time ramp.  With my variable transformer I can get to 150 volts which raises the power of the roast heater to ~ 625 Watts from the OEM 400 Watts.  This of coarse has rendered the roast heater a consumable.  Z&D and now Nesco would not hear of selling me roast heaters.  I have been getting by through the generosity of CoffeeGeeks who have sold or given me their dead machine to harvest heaters from.

Since I was on my last OEM heater and it looked pretty decrepit I have been pushed into doing what I've been talking of since 2004.  I have installed a more powerful heater into the machine.

The Doner nichrome coil came from the corn popper heater shown below:

PJK: MVC-200S.JPG
(Click for larger image)

 
Philip J. Keleshian
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,317
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 Jun 21, 2012, 2:04pm
Subject: Re: Z&D Update
 

The image below shows the "new" coil and the remains of an old OEM coil.  Note the string inside the coil. I would like to know what the material is. I did untie it successfully but looking at it with little fibers dropping off I have to wonder if it should be used near something which I plan to ingest. I elected to not use it.

PJK: MVC-201S.JPG
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Philip J. Keleshian
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,317
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 Jun 21, 2012, 2:08pm
Subject: Re: Z&D Update
 

The new coil was too long to fit on the old Z&D form so I compressed it on a nail and heated it with a Mapp-gas toarch to bring its length down. It is ~ 800 Watts as is, so I didn't want to cut it.

PJK: MVC-202S.JPG
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Philip J. Keleshian
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,317
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 Jun 21, 2012, 2:11pm
Subject: Re: Z&D Update
 

Here is the "new" coil crammed into the old Z&D form.

PJK: MVC-203S.JPG
(Click for larger image)

 
Philip J. Keleshian
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,317
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 Jun 21, 2012, 2:13pm
Subject: Re: Z&D Update
 

Different view of "new" heater.

PJK: MVC-204S.JPG
(Click for larger image)

 
Philip J. Keleshian
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,317
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 Jun 21, 2012, 2:34pm
Subject: Re: Z&D Update
 

Since I elected to not use the questionable string the coils looked as they could expand and touch the mounting screws.  I have used a three wire cord and grounded the exposed metal parts so there is no hazard except to the coffee in the even of the roast getting interrupted by a short. I crammed some mica sheet between the screws and the coil and secured it with RTV.

I am regarding this as a prototype as I want to get rid of the mica altogether.  The mica does stand the heat however it does deteriorate.

Ultimately I want just Nichrome and ceramic but this will give me an idea how a high power heater controlled by a phase control dimmer works compared to the OEM heater powered via the variable transformer.

So far I think I am going to like it although I had to go easy on the heat to avoid smoke from the not fully cured RTV.  One thing I did notice is that the EMI from the router controller effected the electronics in the machine as when I changed the power the speed of the motor would change.  It is not a problem except when speed changes in a Z&D one worries that the auger bearing is about to seize.

Below is a picture of the variable transformer which I used with the old heater next to the Harbor Freight router controller which I now use.

Phil

PJK: MVC-210S.JPG
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Philip J. Keleshian
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,317
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 Tue Jun 26, 2012, 12:01am
Subject: Re: Z&D Update
 

So far I am liking this configuration. The RTV smoke has subsided so I can run it full power (~800 Watts).  This is a bit more margin over the old configuration. I no longer have to worry about room ambient temperature.  For the next iteration I may go for ~ 1000 Watts.

Phil

 
Philip J. Keleshian
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oldgearhead
Senior Member
oldgearhead
Joined: 25 Jan 2010
Posts: 388
Location: Go Colts!
Expertise: I like coffee

Grinder: Virtuoso by Baratza
Drip: Chemex,Dilongi DCM900
Roaster: 1/2K Fluid-bed
Posted Tue Jun 26, 2012, 11:05am
Subject: Re: Z&D Update
 

PJK Said:

>snip<
.....I may go for ~ 1000 Watts.

Phil

Posted June 26, 2012 link

You should be able to easily handle 500 gram loads with 1KW.

btw - That 'new coil' mica photo looks like the 'after-burner', not the heater, correct?

Just put one of these in it:

oldgearhead: 861-1633_large.jpg
(Click for larger image)
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PJK
Senior Member
PJK
Joined: 21 Jan 2002
Posts: 2,317
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 Tue Jun 26, 2012, 2:53pm
Subject: Re: Z&D Update
 

Hi Jim,

The new coil is mounted on the form of a failed roast heater.

I'd like that heater which you are showing in there. I have thought of extending the bottom of the machine and supporting the auger drive shaft on two bearings spaced farther from the roast heater and having room for a heater which you are showing.

What my next iteration will probably look like is a bunch of ceramic stand-offs mounted to the roast chamber metal and the heater supported on the standoffs with no mica.  I am looking at the ceramic parts which you gave me.

I hope to have this completed before the present configuration fails.

Phil


oldgearhead Said:

You should be able to easily handle 500 gram loads with 1KW.

btw - That 'new coil' mica photo looks like the 'after-burner', not the heater, correct?

Just put one of these in it:

Posted June 26, 2012 link


 
Philip J. Keleshian
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