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Homeroasters - Home Roasting Coffee Community » ALL ABOUT ROASTERS » Popcorn Popper roasting

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How I put a glass RC on my popper
Airhan	#1 Posted on 02/15/2015 10:13 PM
1/2 Pounder Posts: 228 Joined: September 29, 2013	Every time I mention that I roast coffee I invariably get requests ffrom curious folk to see my roaster, which I'm generally happy to do, except that my popcorn popper used to have 2 tin cans stuck in the top to act as a chimney and give the RC (roast chamber) enough height to stop beans from flying out the top. No more do I need to worry about the aesthetics of my roaster though: I have a glass tube instead of the tin cans! Beautiful. It is so easy to see the color of the coffee! So how did I do it? I have two threaded rods, 2 small pieces of square aluminum, some nuts, and most importantly a 3"pipe clamp. Here is are some close ups of the works: Alright, keep toe pictures in mind and I'll do my best to explain what exactly I did. My threaded rods are #8 32threads/in and I had to drill out and tap the holes where the bakelite portion of the popper connect to the aluminum base, I didn't drill any new holes, I just changed the ones that were already there. The rods are tall enough to stick out of the top of the bakelite housing of the popper, and two nuts (crown nuts so they look nice) on top hold the whole assembly together. At the base of each rod I have 1" box channel cut to 1/2" and held down with nuts and locking washers, the pipe clamp threads through these to peices of box channel and when you tighten it it will pinch the glass tube and hold it (very) firmly in place. To make it easy to clean, and access, I drilled a hole in the front housing of the popper so I can stick a screw drive in and tighten/loosen the clamp to pull out or replace the glass without taking the whole thing apart! This means that I can clean it after each roast...or every few roasts... or every few months...or well you know that goes. I would like to talk about the glass I used, it is a pyrex bake a round tube that I got from Ebay, but it is specifically the "duo version" that come in pairs, these are 3" in diameter, compred to all the other bake a rounds that are 3.5". Only the duo version will fit. These are rather rare, but if you really want to replicate what I have done here, you can find a local scientific glass supplier and ask for a glass tube that has a outside diameter of 75mm and a wall thickness of 2.4mm and 12" long (the bake around is 12, eleven or ten would be sufficient too) Well, that my bit. If I forgot anything critical then please ask for clarification, comments are encouraged. Aaron "Grind it like it did you some great injustice!"D.L.Clark


snwcmpr	#2 Posted on 02/16/2015 7:18 AM
1 1/2 Pounder Posts: 925 Joined: March 03, 2011	Nice work Aaron. Do you turn the entire roaster over to dump? Is there an issue with the glass swelling against the pipe clamp? Thanks, Ken in NC -------------- Backwoods Roaster "I wish I could taste as well as I wish I could roast." As Abraham Lincoln said "Do not trust everything you read on the internet".


Airhan	#3 Posted on 02/16/2015 8:50 AM
1/2 Pounder Posts: 228 Joined: September 29, 2013	Thanks Ken! It is borosilicate glass, which experiences minimal thermal expansion, I'm sure that if the clamp were over tightened then the risk of broken glass would increase as well, I only ever tighten it enough that the RC is held in place. I do pick up the whole popper and flip it over to dump the beans, the RC hasn't slipped while doing so. Aaron "Grind it like it did you some great injustice!"D.L.Clark


snwcmpr	#4 Posted on 02/16/2015 11:01 AM
1 1/2 Pounder Posts: 925 Joined: March 03, 2011	Thank you Aaron, that's good to know. I too have the same glass in my roaster, built by Allen. The larger Bake A Round. Ken in NC -------------- Backwoods Roaster "I wish I could taste as well as I wish I could roast." As Abraham Lincoln said "Do not trust everything you read on the internet".


allenb	#5 Posted on 02/16/2015 6:33 PM
Administrator Posts: 3650 Joined: February 23, 2010	This is one of the slickest Popper mods I've seen. Great work Airhan and thanks for the detailed description! Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


Airhan	#6 Posted on 02/16/2015 10:39 PM
1/2 Pounder Posts: 228 Joined: September 29, 2013	Thanks Allen! Aaron "Grind it like it did you some great injustice!"D.L.Clark

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