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10/19/2021 6:22 AM
Welcome tarunk!
10/17/2021 12:40 PM
Ploni and nader fouad, Welcome!
10/15/2021 2:19 AM
merlot85, maycondelpiero and hoeltz, Welcome !
10/14/2021 10:06 AM
Thanks for the addition to the group. Seriously considering building a drum roaster along the lines of oldgrumpus's. Love the design and craftsmanship.
10/14/2021 4:00 AM
Morning, ar3mia ! and... 
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 Sight Glass
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| BobbyS |
Posted on 07/06/2011 12:47 AM
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 1/4 Pounder  Posts: 179 Location: Joined: July 02, 2011 |
Hi, Noob here. Been roasting about a year or so with a turbo and then a bbq grill with a drum. I am going to start getting stuff together for a drum build this winter. Where the heck do people get the sight glass/windows they use. I saw where Boom used what looked like two different ones in his build. Appreciate any help. ;) Thanks, BobbyS |
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| Koffee Kosmo |
Posted on 07/06/2011 2:56 AM
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 Administrator  Posts: 1572 Location: Brisbane Australia Joined: December 31, 2008 |
I am of the opinion that any piece of glass will do the job Heat will not be the problem I do however like the idea of using the business end of magnifying glass This will also give you a larger and clearer view of the roast Having said that, you can also find a pair of round rim eye glasses in a thrift store use one and have one for a spare KK I home roast and I like it. Designer of the KKTO
Roaster Build information https://forum.hom...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster. |
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| Daveziol |
Posted on 07/06/2011 11:03 AM
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 Newbie  Posts: 21 Location: Joined: June 17, 2010 |
Hey Bobby - I searched online for borosilicate glass, like what Pyrex products or lab equipment are made out of. I found little 1/8" thick discs on McMaster-Carr: http://i.imgur.co... Be careful though! It didn't like being sandwiched directly up against metal and it chipped on the edges. I bought a new one and made some gaskets out of a kind of heat-proof card stock material that I had laying around. -Dave |
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| seedlings |
Posted on 07/06/2011 11:07 AM
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 1 1/2 Pounder  Posts: 4226 Location: Kansas City, Missouri Joined: June 27, 2007 |
+1 for any glass... except... do NOT have glass directly touch the metal. Make sure the glass is attached via high-temperature silicone. If you want an inexpensive piece of thick tempered glass, buy a cheap 500W halogen shop light. Remember you can't cut tempered glass or pyrex (a good glass shop can, though). Or you can google on-line glass suppliers where they will take a custom order for whatever you want. CHAD Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500 Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover |
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| BobbyS |
Posted on 07/06/2011 12:51 PM
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1/4 Pounder Posts: 179 Location: Joined: July 02, 2011 |
Ok...thanks! I was under the impression it had to be high temp glass and all the places online I found were huge manufacturing places and big $$$$. I'll give a regular one a go. I have some hi-temp silicon. Thanks again! BobbyS |
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| BobbyS |
Posted on 07/06/2011 12:57 PM
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1/4 Pounder Posts: 179 Location: Joined: July 02, 2011 |
Quote Daveziol wrote: Hey Bobby - I searched online for borosilicate glass, like what Pyrex products or lab equipment are made out of. I found little 1/8" thick discs on McMaster-Carr: http://i.imgur.co... Be careful though! It didn't like being sandwiched directly up against metal and it chipped on the edges. I bought a new one and made some gaskets out of a kind of heat-proof card stock material that I had laying around. -Dave I will also give McM a look also. Awesome cutout work on your pieces by the way! |
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| dja |
Posted on 07/06/2011 3:04 PM
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 1 1/2 Pounder Posts: 701 Location: Choctaw Oklahoma Joined: November 07, 2008 |
if you looking for a small round sight glass such as is used on boilers it depends on where you live but you might want to check out burner and boiler places, they are usually easy to deal with if you can explaine to them what your hunting. The quartz yard lights can yield up s pretty good sized piece od BoroSillicate glass, it can be cut as Chad said finding a glass guy to cut it may be kinda hard, you can always use a diamond wet saw to do it with, Tile saw, you may want to talk to Dan more about cutting the stuff he says he has some experiance in this area. I don't really hold with the idea of using regular glass, its just not made to handle the stresses of what a roaster can be put thru, I bumped my roast chamber the other day accidentally now i have a spot like a rock chip in a windshield on it, tiny but I know its there, what it will do I don't know, I know I hope I don't have to buy another tube. what are you using to cut your parts with looks like a flowjet, or did you do it on a mill using cnc??????????More pictures of your project please David I pour Iron and roast Coffee Beans
 If life seems normal your not going fast enough Mario Andrette |
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| nfcwest1 |
Posted on 08/13/2011 9:49 PM
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Newbie Posts: 28 Location: Joined: August 12, 2011 |
Go get your self a little 2" halogen puck light , the glass is heat tempered and round. YOU can get them at Home D. for $9. I know a little pricey for a little piece of glass. |
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| Ringo |
Posted on 08/15/2011 6:14 AM
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 Pounder  Posts: 474 Location: Joined: January 14, 2010 |
When I built my drum I used this glass from Mcmaster Carr,http://www.mcmaster.com/#8477K41 I just made a loose fit, no gaskets. Just metal to glass with room for expansion. My view hole is only 7/8 dia but it works. I did end up having to put in a second one, the one in the dump door was not usable because the beans flew by too fast. I cut my hole for the glass with a 1" hole saw and a hand drill. The wobble gave me the clearance I needed. Drilled the first hole almost all the way through, then I used a 7/8 holes saw and drilled all the way through. This gave me a nice pocket for the glass. Ringo All you need in life is ignorance and confidence, and then success is sure. Mark Twain
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| boom |
Posted on 08/15/2011 12:40 PM
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1/4 Pounder Posts: 150 Location: South Africa Joined: June 08, 2009 |
Hi BobbyS I haven't been active on the site in a long time, but I'd like to get back into it. The first site glass I used was a simple heat treated (tempered) glass. Unfortunitely, it broke quite quickly. They heat the glass gradually to 600 deg C to temper it, but it is not very shock resistive. ie, you cannot change the temperature rapidly with the glass. Also, using it in a roaster that heats up and cools down slowly reduces the amount of tempering, which reduces it's strength. I found that, when roasting, there's a lot of moisture retained in the drum. When it cools down and you fire it up again, condensation forms on the glass which quickly cracks it. So tempered glass is not the best route. Keep in mind that ANY drilling into the glass reduces it's strength. Small cracks in the glass from the drillbit can easily create larger cracks, so don't go this route. My new machine has a boroscilicate sight glass specially made for the machine. It was only about $15, so it's not too bad. Look out for guys who do laboratory equipment and test tubes. They can usually point you in the right direction. Good luck and keep us updated! A good espresso should give you hair on your chest!
Nuova Simonelli Mac Cup S, Mazzer Super Jolly, 1962 Faema President 2-group Lever, 1960 Faema Urania Grinder, 2kg profile controlled roaster |
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| boom |
Posted on 08/15/2011 12:42 PM
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1/4 Pounder Posts: 150 Location: South Africa Joined: June 08, 2009 |
Oh yes, like seedlings said, do not have the glass touch any metal surface directly. Wrap the glass in a cermic woven fibre. You can find strips at any good fireplace shop. It's the same kind they use to keep glass panes in fireplaces in place.
A good espresso should give you hair on your chest!
Nuova Simonelli Mac Cup S, Mazzer Super Jolly, 1962 Faema President 2-group Lever, 1960 Faema Urania Grinder, 2kg profile controlled roaster |
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| BobbyS |
Posted on 08/15/2011 5:04 PM
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1/4 Pounder Posts: 179 Location: Joined: July 02, 2011 |
Thanks everyone. I got a glass from McMaster and made a brass frame for it. Would high temp silicon work to keep the glass isolated from the metal? Thanks! |
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