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Homeroasters.org » BUILDING A ROASTER » Drum Roasters
Who is here? 1 guest(s)
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Gas Fired Drum Roaster - Lets Build It
Lylabrown
The desired features and qualities for this build are:
- Solid drum.
- Capacity up to 2lb.
- Airflow & Propane gas controlled via Laptop/TC4C/Roastlogger.
- Manual overrides for electric/gas components with the flip of a switch.
- Cyclone for chaff collection.
- Simple to maintain; all mechanical, gas, and electric components accessible.
- Safety via PID = Fire ignitor if flame goes out, Fire cutoff solenoid if that fails.
- Good view of beans and flame.
- Fun to build!

I've already built and tested the drum. It's a salvaged 20lb fire extinguisher (thanks AllenB) with a 7" diameter and 3/32 wall thickness, 10" long. The vanes are 1" tall, and set at 20*. Mixing from front-to-back & back-to-front is excellent. There's also a good dead-space in bean rotation on the front face which is ideal for the sight-glass and bean probe (as seen in the attached photo).

Russ
Lylabrown attached the following images:
mixing.jpg vanes_1.jpg testrig.jpg
 
Ringo
That is awesome. That's a very professional design and will work great. You have the hard part done. I love seeing more and more drums getting built.
All you need in life is ignorance and confidence, and then success is sure. Mark Twain
 
Lylabrown
Thanks Ringo. I referenced your drum photos many times when trying to figure out the configuration of the mixing vanes and support arms. That's the beauty of posting build logs, somebody somewhere is bound to get useful information out of them.

I made some progress today!
The rough framing for the roast chamber is complete. The front & rear walls are 3/16" mild steel, which will be strong -- but at the same time keep the thermal mass to a minimum. The roast chamber will be double-walled on the back with 1/8"sheet, and the sidewalls & ceiling (between the drum and exhaust line) in 3/32" thick steel.

I decided to go with an 2" OD exhaust line (probably overkill). Its enclosed in the framing like the probat's. It'll be removable from the rear for cleaning with minimal fuss.

The pressed steel bearing block was too large for my liking (see photo), so I made one out of aluminum instead. It has the added advantage of keeping the bearing that much further away form the heat.

Russ
Lylabrown attached the following images:
bearing.jpg rearish.jpg frontish.jpg
 
allenb
Howdy Russ, this is looking like it will be giving Probat some competition. I've always dreamed of building one that resembled the older probat L-12 shop roasters, someday...

Great work! keep us posted.

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
Lylabrown
I appreciate the praise Allen. Yep, I'm blatantly stealing many of Probat's design ideas, particularly the Probatino. It's a beautiful roaster.

The bean hopper/exhaust manifold is mostly done. Its constructed of 2" tubing and 3/32" sheet steel. The ring at the top of the hopper is leftover material from the drum. The fit-up and welding went relatively fast, the shaping and finishing took forever.

Russ
Lylabrown attached the following images:
jigged.jpg conebend.jpg conewelded.jpg side_2.jpg rear.jpg mounted.jpg
 
Omega
Now THAT'S impressive! Someone has some incredible fabrication skills. The roaster is looking GREAT!
 
Ringo
This roaster is going to be great. I love to see the quality of craftsmanship you are putting into this roaster its going to be great. On my build when welds were in the picture I had too pull back so the poor welds did not show much. I had a friend who is a welder come over and see my roaster and he said "you should have had me weld the thin stuff". Its an awesome thing when you roast the first batch and you think "I made this".
All you need in life is ignorance and confidence, and then success is sure. Mark Twain
 
snwcmpr
Yes, impressive.

Ken in NC
Backwoods Roaster
"I wish I could taste as well as I wish I could roast."
 
JackH
Russ, this looks like a great project! That gear motor looks familiar, is it the one from Surplus center? They were a great deal but I think they no longer have any.

I will be following this and maybe be able to put one together myself.
---Jack

KKTO Roaster.
 
Lylabrown
Wow! Thanks for all the compliments. I'm glad you guys like the progress.

Ringo, Agreed, welding thin stuff is no fun. It's a fine line between too little and too much heat. The great equalizer is an angle grinder with a 60 grit flapper wheel.

Jack, That's the same motor. It's been sitting in a drawer for two years waiting for the right project. It was too good of a deal to pass up!


On a side note: I was prowling google images for good tear-down photos of Probat's and stumbled upon this site: http://translate..../289965659

Check out the "1 kilo CUBE" he made, found on the left sidebar. Neat stuff.

Russ
 
allenb
My vote goes to the paisley cube. But, we want you to stay with classic German roaster colors so don't go getting any ideas. smoking

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
Lylabrown
Not to worry Allen, The finished roaster will be cold and stark (black with some stainless bits), very German indeed.

The pipe burner and gas controls are finished. Here's a video of the basic setup:

http://vimeo.com/...

The solenoid is a clippard mouse valve (http://www.clippa.../ET-2-12-H) with the low pressure/high flow orifice. It'll be controlled via TC4C & Roastlogger. One of the needle valves bypasses the solenoid to provide the low flame state, the other controls flow through the solenoid for the high flame state.
It works surprisingly well.

Russ
 
allenb
Looking good! It looks like you'll have plenty of control with your setup without going proportional. One benefit of this valve versus the proportional is the much lower current draw. My proportional valve runs at 2.3 watts at full open versus your Clippard ET-2 at a little over 1/2 watt.

I'm assuming you can just use a simple transistor circuit switched by the Arduino to drive it?

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
broeker
Thats a pretty cool gas setup shown on your video....... mmmmm are those clip valves difficult to get? maybe I could control my setup with the same thing..... nice work :-)
 
Lylabrown
Hey Allen, Much credit goes to you for blazing-the-trail when it comes to gas control for home roasters. I'm very happy with how the control scheme works. The trick was drilling the right size orifice (#72 drill) in relation to system psi (max. 10psi) to allow for the right btu output (max. 26k), but also to promote good air mixing by the venturi at both low and high pressure for a stable flame. Using appropriately sized needle valves really helps as well.

I liked the low power consumption specs of the valve as well. It has a side benefit of allowing the valve to run very cool. I did an experiment running the valve 5 seconds on/off for an hour using a timer circuit and the valve remained at ambient temperature the whole time.

I'm going to use a DC-to-DC SSR for switching the arduino's output. I want to keep the arduino/TC4C isolated from the solenoid.



Pieter, The clippard valves are easily attained from the manufacturer (with shocking shipping rates). I decided to order mine from "the bay" instead, mine
was under $10 with free-shipping! The hard part was finding one with the "H" designation (low pressure/high flow orifice).
 
allenb
Thanks Russ! It was fun experimenting with gas valves/controls during the design and testing phase. Much credit goes to Stan (Rustic_Roaster) who was my teacher and chief driver board designer during the conceptualization and design phase.

I'm assuming the #72 drilled orifice is the burner orifice at the venturi?

You can't beat a $10 dollar price tag for a solenoid that will handle billions of cycles and one that won't overheat during rapid cycling to boot!

Please post details as to your whole gas burner setup and control so others can benefit from your design. I think there will be many wanting to power their roaster using your approach. If you don't mind, it would also be great to be able to post your burner and control details in our "Electric and Gas Heat Sources" forum.

Keep us posted!

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
TheoBro
This is a wonderful project I wanted to copy but it seems to have stalled. I hope the OP is still around and can update.
 
Turingalad
Lylabrown,
What's the news on your build?? I've ebjoyed following this and learned a lot, and can't wait to see more!
Have you decided what to do with prob-placement/datalogging?
How about airflow/chaffcollecting?

Awesome build so far!
 
Turingalad
Russ, or Allen,

I'm interested in more of a breakdown of the burner setup.

I'm pretty novice when it comes to LP and automation.

I'm using propane, and Artisan (but could switch to another platform if needed), on a 1k drum roaster (very similar setup to Russ).

I started out looking for a simple way to gauge gas input to accurately manually input that data in Artisan, but rediscovered this thread and am now wanting more...

Thanks
 
allenb
Russ, or Allen,
I'm interested in more of a breakdown of the burner setup.
I'm pretty novice when it comes to LP and automation.


Shoot us some specifics of what areas of burner setup you're needing help with. Lots of possible areas to dive into when it comes to regs, solenoids and burners. My preference would be to go with Russ's setup with it's simple proportional on-off mode of operation.

Something to consider with drum roasters is their inability to be controlled well for profile following due to the large bean temperature hysteresis. On the other hand, Tom Coxon has added features in Roastlogger that allow multiple PID settings which may allow one to fine tune it well enough to eliminate large over/undershoots during 1c to finish. I would love to hear from anyone who's been able to tame a drum roaster using Roastlogger with multiple PID settings.

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
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