A new roaster modification

For several months, we have been discussing and planning a roaster modification that was a little tricky to predict.  After a lot of discussions and then a few tests, we have moved into the production phase of testing.  The modification was a simple addition of a baffle to direct convection of hot air and thereby increase efficiency on the outside of the roasting drum.  Size, placement, and material were something we spent a lot for time on beforehand.  We currently have them installed on both roasters.

Initial results have been noticeable increases in aromas and clarity.  All roasts from the 21st on have this modification and you will notice a positive difference in your favorite coffees.  Special thanks to Luminarecoffee's Andrew Coates for help in the design and installation.

Grinder timer modification

Omron timer (00.01~99.99 seconds), ebay
Aluminum project box, RadioShack
Momentary pushbutton, RadioShack

Reducing coffee waste and able to grind on push of a button, priceless...

How to b-spec your coffee roaster

Take one coffee roaster. Replace every single wire and connectors. Sprinkle in some new components. Add a lot of sweat and frustrations... b-spec!

Before and After(control panel):



Before and After(Power Distribution):



Before and After(Chassis):

Tachometer for Huky300

Bicycle tachometer modified to fit and measure drum rotation rpm. This is done in anticipation of future motor replacement (of a higher rpm unit) and addition of variable speed control. Goal is to have drum rotation as part of the profiling, in additional to gas and air settings.

I replaced the stock 20vdc adaptor with a 24vdc unit, which "restores" the stock motor to it's default speed. The "as-purchased" configuration down-rated the motor (reason unknown). Drum rotation increased from 44rpm to 52rpm.

Trial runs already showed differences in the profile. At first glance, roasts seemed to be much more even at the higher drum speed. How it affect the cup will be determined in the coming weeks...