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pisanoal
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· 05/27/2020 10:14 AM
Anyone else have issues seeing the whole window of a thread when accessing from a mobile phone? Any fixes?

allenb
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· 04/02/2020 4:50 AM
Morning Ed, I haven't done any green coffee hoarding yet but am hoping the supplies don't end up like the toilet paper isles!

snwcmpr
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· 03/31/2020 2:53 PM
Hey Ed. Thanks. roar

homeroaster
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· 03/31/2020 11:21 AM
Hey quarantined home roasters! I hope you have great coffee! If they have a run on coffee, I hope you're set with your great home roast! Find me on Facebook! Ed Needham

snwcmpr
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· 03/25/2020 11:49 AM
New Rochelle in the news. I think of you every time I hear it. ... Please stay safe.

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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.servocity.com/motion-comp...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 08/03/2019 4:36 AM
 
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.automationdirect.com/adc/...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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