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Another 1.5kg or 3lb drum roaster from scratch
yamhill
Thanks for sharing your progress. The photo link above doesn't work for me.
Quest M3 w/ Artisan via ESP32 emulating TC4. Previous roasters include: IMEX digirosto 1500, various popcorn popper roasters, and Behmor. Espresso: Quick Mill Vetrano; previous espresso PIDed Rancilio Silvia. Also Chemex, Hario, and Melitta drip; Cory and Yama vacuum/siphon; bodum French press; aeropress; Mazzer Major, Hario mini, and PeDe Dienes grinders.
 
JackH


I get a 404 error not found.
---Jack

KKTO Roaster.
 
oldgrumpus
I will try to fix the link asap.
Clever Coffee Dripper
Grinder: Macap M4
Roaster: Completed drum roaster project photos shown here:
Photos https://goo.gl/ph...Da6K4wfqw5
Videos https://www.youtu...Bd1NrdpSUH
 
JackH
Post the corrected link when you get a chance and I will place it for you.
---Jack

KKTO Roaster.
 
oldgrumpus
Link to photos of the project:

https://goo.gl/ph...Da6K4wfqw5
Clever Coffee Dripper
Grinder: Macap M4
Roaster: Completed drum roaster project photos shown here:
Photos https://goo.gl/ph...Da6K4wfqw5
Videos https://www.youtu...Bd1NrdpSUH
 
yamhill
Thanks for sharing your progress. I admire your metal working skills.
Quest M3 w/ Artisan via ESP32 emulating TC4. Previous roasters include: IMEX digirosto 1500, various popcorn popper roasters, and Behmor. Espresso: Quick Mill Vetrano; previous espresso PIDed Rancilio Silvia. Also Chemex, Hario, and Melitta drip; Cory and Yama vacuum/siphon; bodum French press; aeropress; Mazzer Major, Hario mini, and PeDe Dienes grinders.
 
oldgrumpus
I posted some photos of my silver brazing to attach the vanes to the drum sides.
https://goo.gl/ph...QBepy2Ka16
Clever Coffee Dripper
Grinder: Macap M4
Roaster: Completed drum roaster project photos shown here:
Photos https://goo.gl/ph...Da6K4wfqw5
Videos https://www.youtu...Bd1NrdpSUH
 
oldgrumpus
Here is a video of my gas setup. I need some help figuring out how to get a bigger flame that has less yellow. I know it needs more air, but how? Is my gas pressure to low? Why is it pulsing?


Clever Coffee Dripper
Grinder: Macap M4
Roaster: Completed drum roaster project photos shown here:
Photos https://goo.gl/ph...Da6K4wfqw5
Videos https://www.youtu...Bd1NrdpSUH
 
allenb
A few questions

Pressure entering the gas valve?
Max allowed gas pressure to your gas valve?
Burner orifice size?
Btu rating of the burner?
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
oldgrumpus
Pressure entering the gas valve has not been tested. I will do that, but until then, here are the specifications of the valve:

Specifications:

Manufacturer: White-Rodgers
Model # 36C03-333
Ignition Type: Standing Pilot
Gas Type: Natural or LP Gas (LP Conversion Kit Included)
Stages: 1
Opening Characteristics: Fast
Max BTU/HR @ 1" Pressure Drop: 230,000 (Natural); 372,600 (LP Gas)
Voltage: 24
Hertz: 50/60
Amperage: 0.230
Pressure Regulator Factory Set To (Natural): 3.5" W.C.
Pressure Regulator Adjustment Range (Natural): 2.5"-5.0"
Pressure Regulator Adjustment Range (LP Gas): 7.0"-12.0"
Maximum Pressure: 1/2 PSI (14.0" W.C.)
Inlet Size: 1/2" NPT
Outlet Size: 3/4" NPT
Pressure Tap Size: 1/8" NPT
Pilot Gas Connection: 1/4" Compression Fitting
Ambient Temperature Rating: -40? F to 175? F (-40? C to 79? C)

It seems more than adequate as far as the BTU's.

I don't understand the pressure specifications.

The burner is rated at 31,300 BTU's.

Orifice size is #120 (#61 drill).
Clever Coffee Dripper
Grinder: Macap M4
Roaster: Completed drum roaster project photos shown here:
Photos https://goo.gl/ph...Da6K4wfqw5
Videos https://www.youtu...Bd1NrdpSUH
 
allenb
If the orifice size corresponds to a #61 drill bit which is .039" diameter, you will be under powered by a large margin, see chart. This would also cause an insufficient draw of air which would be a possible reason for the yellow tips. If your orifice is sized to a #120 drill, you would have around 36,000 btus or 10.5 kw.
allenb attached the following image:
capture_11.png

1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
oldgrumpus
Yes, that is correct. I put a pressure gauge on the output of the pressure regulator. Nothing measurable! The place I purchased it sold me the old style of connection and it is not compatible with my newer gas bottle. So I swapped the fittings so the new regulator would work. Now still no measurable pressure. On closer examination, I discovered it's a low pressure model. Just for my own education I looked at the one on the crab pot burner and sure enough, that one is a high pressure model, so it looks like I'm now on a search for a new regulator!
Clever Coffee Dripper
Grinder: Macap M4
Roaster: Completed drum roaster project photos shown here:
Photos https://goo.gl/ph...Da6K4wfqw5
Videos https://www.youtu...Bd1NrdpSUH
 
specialreserve
Great post I am following along. I am building one similiar to what you have going myself so your posts are helpful and I appreciate it.
Brian

Allenb Im in Louisiana too where you at?
 
oldgrumpus

Quote

specialreserve wrote:

Great post I am following along. I am building one similiar to what you have going myself so your posts are helpful and I appreciate it.
Brian



Hey Brian... Welcome! And thanks for the emotional support! :-) So glad that my posts are being helpful to you! Please let me know if you have any questions!
Clever Coffee Dripper
Grinder: Macap M4
Roaster: Completed drum roaster project photos shown here:
Photos https://goo.gl/ph...Da6K4wfqw5
Videos https://www.youtu...Bd1NrdpSUH
 
oldgrumpus
Problem with the burner (shown in video above) is solved. Got a new regulator.

Clever Coffee Dripper
Grinder: Macap M4
Roaster: Completed drum roaster project photos shown here:
Photos https://goo.gl/ph...Da6K4wfqw5
Videos https://www.youtu...Bd1NrdpSUH
 
allenb
The maximum input pressure rating for your white rogers gas valve is 1/2 psi. Anything over this can cause malfunctioning and/or dangerous conditions. If you aren't able to get the valves rated output pressure when sending it no higher than 1/2 psi (13.85" H2O), you should find out why this is the case and make corrections.
allenb attached the following image:
capture_12.png

1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
CK
Wow, nice commercial grade machine! Using the link, I was mesmerized watching the drum with beans rotation test... Short and cool video. Great work, and good documentation. Thanks for sharing.
 
oldgrumpus

Quote

allenb wrote:

The maximum input pressure rating for your white rogers gas valve is 1/2 psi. Anything over this can cause malfunctioning and/or dangerous conditions. If you aren't able to get the valves rated output pressure when sending it no higher than 1/2 psi (13.85" H2O), you should find out why this is the case and make corrections.


Wow! Thanks for pointing this out allenb! So the answer is not to increase the input pressure, but to drill-out the orifice?
Clever Coffee Dripper
Grinder: Macap M4
Roaster: Completed drum roaster project photos shown here:
Photos https://goo.gl/ph...Da6K4wfqw5
Videos https://www.youtu...Bd1NrdpSUH
 
allenb

Quote

allenb wrote:

If the orifice size corresponds to a #61 drill bit which is .039" diameter, you will be under powered by a large margin, see chart. This would also cause an insufficient draw of air which would be a possible reason for the yellow tips. If your orifice is sized to a #120 drill, you would have around 36,000 btus or 10.5 kw.


Need to correct an error here. I mentioned that an orifice sized to a #120 drill would yield 36,000 btus at 1" H2O. I'm sure the #120 is .120" diameter, not drill #. In running the numbers through the btu calculator, we get 35,859 btus using a .120" diameter orifice at 1" H2O. .120" diameter equates to a #31 drill bit.
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
oldgrumpus
Thanks much! I'll drill it out and see what the effect will be!
Clever Coffee Dripper
Grinder: Macap M4
Roaster: Completed drum roaster project photos shown here:
Photos https://goo.gl/ph...Da6K4wfqw5
Videos https://www.youtu...Bd1NrdpSUH
 
oldgrumpus
I'M STUCK! In my gas setup, I can't seem to get enough pressure through my safety valve to run my burner. All the safety valves I've looked at run with only 1/2 psi on the input side.

(FYI: a safety valve is what you have on your forced-air furnace or your gas water heater. It runs the pilot light and the burner. Also, if the pilot light goes out then everything shuts-down so nothing will blow-up.)

If any of you are running a setup with a safety valve and a pilot light, please help me out if you can. If I don't hear from any of you, then I'll ditch the safety valve and go to running my roaster like a BBQ.

Maybe someone is using a gas fireplace log setup with a pilot light? I don't know... just throwing out ideas...
Clever Coffee Dripper
Grinder: Macap M4
Roaster: Completed drum roaster project photos shown here:
Photos https://goo.gl/ph...Da6K4wfqw5
Videos https://www.youtu...Bd1NrdpSUH
 
JSA Coffee
My Primo Roaster uses a gas valve and control module similar to a furnace. For the time being, I am running it off of a 20# propane tank with a standard regulator. Maybe I can help? Have you checked the wiring diagram to make sure you have the right voltage going to the right terminals?

Also make sure you have the valve adjusted for the right pressure output. Just a couple places to start with.
 
Ringo
My safety valve runs 12 psi. I had trouble finding it. I will look when i get home and see if i can find a part number on it. I recommend using one because if i drop my roasting pressure too much the flame will go out. At 1st crack I usually go to 5 psi and everything is ok but if I go to 4 the burner may go out.
All you need in life is ignorance and confidence, and then success is sure. Mark Twain
 
Ringo
No luck only thing on the valve was an ink stamp t-86. Tried to look it up but no luck. I remember it took me a lot of looking to find one. I will look through old records and see if I can find anything but it?s been 9 years sense my build. One think you might look at is flame eye fire sensors Commercial boilers and home furnaces are all using that now. The mechanical valves may just not be sold now.
Edited by Ringo on 01/17/2019 6:28 PM
All you need in life is ignorance and confidence, and then success is sure. Mark Twain
 
oldgrumpus
Thank you Ringo! If you can?t find any info, a photo might help ...
Clever Coffee Dripper
Grinder: Macap M4
Roaster: Completed drum roaster project photos shown here:
Photos https://goo.gl/ph...Da6K4wfqw5
Videos https://www.youtu...Bd1NrdpSUH
 
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