HomeRoast Digest


Topic: Roaster motor--heavy duty (15 msgs / 334 lines)
1) From: Mark Neuhausen
I have a friend who had great results on a whole pig roaster using a washing
machine motor.  Those could probably be found for almost free and run on
110V.
-Mark
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2) From: Dan Bollinger
I'm guessing that washing machine motors are 1/3Hp and 1750 rpm.  I believe
they have a high and low speed, probably 1050rpm. They are not the easiest
to wire.  To get to 60rpm, you'd need an 18:1 reduction which means a jack
shaft and two belts.  Dan
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washing
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3) From: Ed Needham
I do think I want at least 60 RPM, and a speed control so I can experiment
with optimum RPM.  Motors I've seen on Grainger's are all over $100, so I am
going to look for a better deal on Ebay or elsewhere.
Ed Needhamhttp://www.homeroaster.comed
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4) From: Dan Bollinger
Something I've thought about that might be just right is the motors used in
home electric ice cream makers.  They ought to be cheap on ebay or garage
sales, especially this time of year!  Dan
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am
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believe
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easiest
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jack
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5) From: Ed Needham
Ahhhh...
I have one of those down in the basement...heheheh (evil, mad scientist
laugh).
Ed Needhamhttp://www.homeroaster.comed
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6) From: Dan Bollinger
LOL!  The word you are looking for is canabalize!  ;)   I spell that laugh
as MUAhaha!
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in
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garage
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7) From: floyd burton
Hey that would end up looking a Red Green Machine-heee

8) From: floyd burton
Ed-at 60 rpm would the beans even have a chance to move-think they might be
stuck to the sides of the drum-cntripital (sp????) force???  That is one
rev/second and if it is a 12" drum that is a yard a second-hmm wonder if
anyone has done any roasting experiements at 60 rpm.

9) From: floyd burton
Dan I have an ice cream maker and i will dig it out if i can find it and see
how fast it turns-think it is really slow though.

10) From: Tom Gramila
Your intuition is pretty good here.  The threshold for a bean sticking 
to the wall for a 6" diameter drum can be calculated pretty easily, its 
when the necessary centripedal force just matches that of gravity.  It 
happens at 77 RPM for a 15 cm (about 6") diameter.  
Tom G.
On Thu, 2 Jan 2003, floyd burton wrote:
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11) From: Oaxaca Charlie
 Big pro drum roasters, at least 20 lb.ers, turn at 55 rpm.
About 3' diameter drum-how many yds a second is that? (I have no
idea)
Charlie
--- floyd burton  wrote:
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12) From: Dan Bollinger
That's EASY!  If they turned at 60rpm, the tangential speed would be 2*pi
yards per second. In your case, 55/60*2*pi.    ;)    Dan

13) From: Wendy Sarrett
Or at least Junkyard Wars :-)

14) From: Ed Needham
That's why I want a speed control.  I figure 60 may be about tops as far as
rotational speed is concerned, so I can find the 'top end' speed and play
around with differences.
(sorry about my last post to Floyd.  Sent it without clipping extra text)
Ed Needhamhttp://www.homeroaster.comed
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15) From: Ed Needham
I definitely want the beans to fall off of the stirring vanes, and not ride
the sides.  Barry Jarrett on alt.coffee said his Diedrich runs at about
33RPM, but that's for a 12 pound commercial roaster drum.  He also says that
other commercial roasters run at 50 to 60 RPM.
30 RPM seemed fine for the successful 2 pound roast I did, but a faster speed
might be better.
Ed Needhamhttp://www.homeroaster.comed
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