Recently my dad fabricated a drum roaster attached to a rotisserie on the grill. Our first attempts worked pretty good, but I was wondering if anyon= e else had some advise on this method?? It seemed like the beans roasted fairly quick - is there a certain temperature that the inside of the grill should be through the roast? I'll keep experimenting, but any advise would be helpful. Also, can I put the thermocouple wire probehttp://www.sweetmarias.com/thermo.digital.K.jpgin the grill without meltin= g it? I found a high temp wire (662 degrees F) at this site:http://www.thermoworks.com/products/probe/tc_wire.html. I'm thinking that it won't melt, but I hate to waste the money. So, any help is appreciated. As you can already tell, I'm new to the roasting arena. Thanks, Jon Mc.
Hey Jon, Have a look at some sample profiles from the RK Drum website:http://www.rkdrums.com/drumprofiles.htmI highly recommend heatspreading and the Charbroil diamonds between the flame and your drum. You want even heating with no flames hitting the beans or the thermocouple. I just finished roasting using a K thermocouple about 1/4" above my diamonds; there is about 1/2" clearance between the diamonds and my drum. I recommend taking temperatures here because when my beans are sitting at 470F, the air at the top of the grill is around 700F. Mike On 4/4/06, Jon McShurley wrote: <Snip> one <Snip> l <Snip> ld <Snip> is <Snip>
--- Jon McShurley wrote: <Snip> It certainly depends on how much coffee you are roasting what the grill temp should be at any given moment of roasting. If your beans are roasting too fast try lowering the gas. I pre-heat the grill before starting the roast, and pre-warm the roasting drum by resting it on top of the grill until the grill is almost ready, then I put the beans in the drum and the drum in the grill. The early stages of the roast I run it very hot for a large batch, like 5 lbs., and less and less hot for smaller and smaller batches. Unless you place the beans in a very hot drum they can take a very hot grill temp for at least a few minutes, then let the grill temp come down to where the roast reaches first crack at the time you feel is best for it That takes practice, of course, and maybe some "wasted' Ugh beans from Tom. After first crack gets going there are more temp adjustments nessesary which for me include lowering the gas a fair bit for a couple of minutes before raising again for large batches, but gently raising the gas(after only a very brief lowering) for small batches. For more advanced roasting you'll find the different temps for equal amounts of beans that roast best at higher or lower temps than the average (decaf, monsooned, lower grown, extra high grown etc.). >Also, can I put the thermocouple wire probe <Snip> The only sugestion re. your thermocouple I feel comfortable giving is that the grill temp may well exceed 662 degrees when you're running it empty and forget about it for a few minutes, but it shouldn't reach that high a temp while you are roasting and paying attention, unless you foolishly stick the wire right in the flame ;o) If you can remove or install the thermocouple easily, then no worries. Someone will probably post soon with advice about shielded tubing for the thermocouple wire, which I *think* is what you may need. Charlie Oaxaca dreamin' Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
This is a multi-part message in MIME format. Jon, if you use a thermocouple you will need to mount a tube, Copper = will do so it will sheild the wire from direct heat. I used a 1/2" bolt = and drilled a hole big enought for the wire up to 1/8" from the end and = then a small hole just so bead would fit. I used a length long enough to reach in the grill lid to within 1" of = the center of the drums length and diameter. held to the lid with a 1/2" = nut. I use a analog thermometer, but have used a digital in the past but I = like the analog personaly RK RK
Many folks have funny ideas about thermocouples. I would recommend a 304 or 316 s/s sheathed grounded junction probe of 0.0625-in diameter X 3ft long. It's plenty rugged for the low roasting temperatures we use, and it's very flexible. If you install one in your grill and leave it alone, it'll give you reliable readings. If you need to move it, you can reshape it like a coat hanger. It's not subject to abrasion like the fiberglass or braided stainless covered wire. In any case, the numbers you get will be the temperature of the thermocoupl= e junction, not necessarily the process temperature you want. Cheers -RayO, aka Opa! Got Grinder?