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snwcmpr
08/20/2019 3:47 PM
Roasted the last of the SM Kenya Nyeri Katogoto this morning.

snwcmpr
08/20/2019 3:47 PM
So, Allen gets notification. 'renatoa' gets notification. ... I do not. Funny stuff. But not earth shattering.

snwcmpr
08/20/2019 2:01 PM
PM sent

allenb
08/20/2019 10:32 AM
snwcmpr, send me a pm so can see if I'm getting email notifications now. Thx.

snwcmpr
08/18/2019 4:31 AM
Awesome I sent an email to AllenB and JackH The email to JackH failed. I had screenshots of my settings.

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Gearing a motor down
kwrcst
May be an easy question but if I have a 120rpm Moyer and needed to adjust it down to 60rpm, would I just put a gear on the shaft and a gear half the size on the axel of the drum? Or is there more math involved?
 
renatoa
If by "half the size" you mean half teeth count, then you are right.
 
allenb
Smaller gear (A) on motor, larger (B) on drum
allenb attached the following image:
gears.png

1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
kwrcst
Thanks all. I was hoping it was that simple. I purchased a nice motor with a 68RPM speed off of ebay and then got a notice they couldnt find it. I had to go with a 166RPM so I plan to gear it down. I think I will do an 11 tooth to 28 tooth and it should slow me down to 65.35 RPM.
 
renatoa
May the gear be with you !

https://www.servo...nion-gears

My approach would be to use a belt, not direct drive, less wear, heat isolation, shock attenuation (if a hard bean or a small stone block the drum)... and probably other smaller benefits.
Edited by renatoa on 08/02/2019 10:36 PM
 
allenb
My choice of drive and used on my 1 lb drum roaster is the synchronous drive sprockets and belts components as seen here:

https://www.autom...sprockets)
allenb attached the following image:
belt_and_pulley.png

1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
kwrcst
If this fails, I will be looking at the belt system for aure
 
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