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Another 1.5kg or 3lb drum roaster from scratch
oldgrumpus
It looks like we're much closer to a final design for the gas chain. The gauge is from this website:
http://www.aicons...vAod-y0N6w

How's this look?
oldgrumpus attached the following image:
gas_chain.jpg

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
Looks good to me.

Here's a link to a valve with an appropriate CV for your application at the Generant valve site. Click on the flow coefficient tab and look at the standard stem model. We're shooting for a CV of around .099 or round to .1 at a few turns which will give you around 7 cubic ft/hr maximum flow with an input to the valve of 11" H2O (.4 psi) and a downstream pressure leaving the valve of around 7" H2O (.25 psi). 7 cubic ft/hr equates to around 17,000 btu/hr which is equivalent to 5kw which will give you plenty of heat for a 3-4 lb drum roaster with a little headroom :

http://www.genera.../fnv.shtml

You can probably find a good deal on a similar valve on ebay but make sure you find one with a CV/turns value similar to the one in the link to ensure you have good control.

I did a price check for this valve and it would be hard to beat their price! This one is brass with 1/8" female pipe on inlet and outlet:

http://calibratio...;bc=0|2225

Allen
allenb attached the following image:
fnv_chart.jpg

Edited by allenb on 07/09/2016 9:13 PM
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
oldgrumpus
The "titanium" burner I ordered arrived and although of reasonably nice quality, is not titanium, nor is it stainless. It appears to be mild steel sheet metal because it is strongly magnetic. I guess my expectations were too high Grin

Amongst the photos of the burner is one view of the input end which I didn't think about before ordering because it wasn't clear to me what if anything would be needed. Advice needed. It looks like an orifice and supporting mount will be needed... help!


I'm also trying to select a needle valve. Right now I'm leaning toward a Generant FNV in stainless or one from the Screwed Bonnet product line (also a Generant). The Screwed Bonnet is similar to the FNV series, but uses less rotations to open and close.
oldgrumpus attached the following image:
img_2474.jpg

Edited by oldgrumpus on 07/12/2016 3:21 PM
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
"Titanium" burner.
oldgrumpus attached the following images:
img_2473.jpg img_2471.jpg

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

It looks like an orifice and supporting mount will be needed... help!



In a typical burner setup, the orifice will be screwed into a pipe fitting (tee or 90) and the orifice or jet assembly will support the inlet end of the burner (sticking through the hole of the "U" bracket on your burner) and a sheet metal bracket will support the weight of the other end. The bracket should be arranged as to not allow the burner to slide away from the burner jet. I doubt they sell mounting hardware but thin sheet metal should allow you to make one relatively easy.

Looks like the jet is reasonably priced.

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
oldgrumpus
I have nearly all the parts now for the gas system with the exception of the Generant needle valve which is 6 weeks for delivery!

While waiting, I'm pondering how to appropriately size the exhaust system. Any thoughts on that? I could wing-it, but would rather go in confident that it's a good design.
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
Uploaded a video

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's a new video showing a test of the drum and vanes.


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
The back side and motor. No structure yet, just checking out some of the mechanics..
.

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
Some photos:

https://goo.gl/ph...Da6K4wfqw5
Edited by JackH on 01/15/2017 3:15 PM
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. 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
 
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