Electric Brewing Supply 30A BCS Giveaway!


Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > What RPM range would you use?
Reply
 
LinkBack Thread Tools
Old 12-30-2008, 02:53 PM   #1
GilaMinumBeer
In yo' garage, steelin' yo parts.
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
GilaMinumBeer's Avatar
Recipes 
 
Join Date: Jan 2008
Location: Oblivion
Posts: 48,115
Liked 4829 Times on 4432 Posts
Likes Given: 59

Default What RPM range would you use?

I have finally figured out how to apply my Minn Kota Trolling motor to my JSP Maltmill.

Per Minn Kota, the motor is rated at 1000rpm at it's highest speed. It'll draw 25 Amps under load. So, basically this means it is a .4 Hp motor with super high torque (value unknown). This motor is a 4 speed motor so, by quartering the RPM I deduce that at speed 1 it runs 250 rpm.

After doing some calculations I have settled on a couple combos.

At a 3.125:1.00 speed reduction ratio I get 80rpm at speed 1 and 317rpm at speed 4.

At 2:1 I get 121rpm over 487rpm.


JSP suggests no higher than 300rpm for the lo0gevity of the mill. Furthermore, a hand cranked crush is estimated at 60 to 100rpm and is the most delicate on the grain husk.

What ratio would you shoot for?

Slow rpm's and a longer crush time per pound (noting that it's automated now).

or

Higher rpm's with a slight sacrifice in crush quality but, gettin' the job done quickly.

I am inclined to go for the slower range favoring a better crush but would like to hear what the community has to say.

__________________
GilaMinumBeer is offline
 
Reply With Quote Quick reply to this message
Old 12-30-2008, 05:10 PM   #2
Blender
Feedback Score: 0 reviews
 
Blender's Avatar
Recipes 
 
Join Date: Jan 2006
Location: Santa Cruz, CA.
Posts: 3,116
Liked 5 Times on 4 Posts

Default

I would go for the slower rpm. There are always things to do while the mill is working.
How much grain will you be grinding?

__________________

Gary

Blender is offline
 
Reply With Quote Quick reply to this message
Old 12-30-2008, 05:21 PM   #3
GilaMinumBeer
In yo' garage, steelin' yo parts.
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
GilaMinumBeer's Avatar
Recipes 
 
Join Date: Jan 2008
Location: Oblivion
Posts: 48,115
Liked 4829 Times on 4432 Posts
Likes Given: 59

Default

Quote:
Originally Posted by Blender View Post
I would go for the slower rpm. There are always things to do while the mill is working.
How much grain will you be grinding?
Of course it varies but, I generally do 10 Gallon batches in the 1.050 to 1.070 range. So, anywhere from 12 to 25 pounds, more or less.

I am inclined to agree with you tho'. Take the time and protect the grain and realize some benifit of improved efficiency from a good crush.
__________________
GilaMinumBeer is offline
 
Reply With Quote Quick reply to this message
Old 12-30-2008, 05:26 PM   #4
eschatz
Feedback Score: 0 reviews
 
eschatz's Avatar
Recipes 
 
Join Date: Dec 2007
Location: Terre Haute, IN
Posts: 3,466
Liked 30 Times on 17 Posts

Default

BrewWare by Karl Lutzen and Mark Stevens states in Appendix A:

"Most people that I've talked to recommend running a mill around 100 to 200 RPM. Faster speeds create more dust, vibration, and so on. Most motors you will encounter are either 1750 or 3450 RPM, gearmotors excepted. If you opt for a standard motor, speed reductions can be achieved using a number of pulley and v-belt combinations. I had originally planned to use a 1750 RPM motor, ...so the the mill was designed to use a 10" pulley to create an effective speed of 175 RPM."

__________________
play the bass, brew the beer

What's tappening? :D
eschatz is offline
 
Reply With Quote Quick reply to this message
Old 12-30-2008, 06:58 PM   #5
GilaMinumBeer
In yo' garage, steelin' yo parts.
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
GilaMinumBeer's Avatar
Recipes 
 
Join Date: Jan 2008
Location: Oblivion
Posts: 48,115
Liked 4829 Times on 4432 Posts
Likes Given: 59

Default

Sheaves and Bushings ordered for the low RPM set-up. I'll source a 4L automotive belt once everything is in place and I can get the proper length.

MotorBoatMill house here we come.

__________________
GilaMinumBeer is offline
 
Reply With Quote Quick reply to this message
Old 12-30-2008, 07:51 PM   #6
Jonnio
Feedback Score: 0 reviews
 
Jonnio's Avatar
Recipes 
 
Join Date: Dec 2007
Posts: 1,525
Liked 7 Times on 7 Posts
Likes Given: 1

Default

sounds pretty sweet, make sure to post some pics. I too would have opted for the slow speed, its not like your sitting there spinning a crank by hand in order to mill the grain, so who cares how long it takes.

__________________

------------------------------------------------
Official member of HBAMAP (Home Brewers Against Murder and Pedophilia)

Quote:
Originally Posted by Revvy View Post
Then that means dumping your beer because you think it's bad is tantamount to abortion! And as Big Kahuna says, drinking a beer too soon is tatamount to beer pedophilia...
Jonnio is offline
 
Reply With Quote Quick reply to this message
Old 12-30-2008, 08:30 PM   #7
Anthony_Lopez
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
Anthony_Lopez's Avatar
Recipes 
 
Join Date: Mar 2008
Location: Groton, MA
Posts: 1,693
Liked 17 Times on 8 Posts
Likes Given: 2

Default

I've said it before, but I'll say it again. Don't waste a working Minnkota on that project. Use a motor guide... Granted, the motor guide will need to be replaced 10 times before your mill shows wear, but damn, save that Minnkota!!!

__________________

I'd rather have a bottle in front of me, than a frontal lobotomy.
--Tom Waits

You can't be a real country unless you have a beer and an airline - it helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer.
--Frank Zappa

My Cheap and Easy Stirplate

Anthony_Lopez is offline
 
Reply With Quote Quick reply to this message
Old 12-30-2008, 08:46 PM   #8
GilaMinumBeer
In yo' garage, steelin' yo parts.
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
GilaMinumBeer's Avatar
Recipes 
 
Join Date: Jan 2008
Location: Oblivion
Posts: 48,115
Liked 4829 Times on 4432 Posts
Likes Given: 59

Default

Quote:
Originally Posted by Anthony_Lopez View Post
I've said it before, but I'll say it again. Don't waste a working Minnkota on that project. Use a motor guide... Granted, the motor guide will need to be replaced 10 times before your mill shows wear, but damn, save that Minnkota!!!
But, I did save the Minn Kota.











For this it appears.
__________________
GilaMinumBeer is offline
 
Reply With Quote Quick reply to this message
Old 12-31-2008, 12:04 AM   #9
BrewBeemer
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2006
Location: island, inside an atoll
Posts: 3,507
Liked 20 Times on 20 Posts
Likes Given: 7

Default

Quote:
Originally Posted by Anthony_Lopez View Post
I've said it before, but I'll say it again. Don't waste a working Minnkota on that project. Use a motor guide... Granted, the motor guide will need to be replaced 10 times before your mill shows wear, but damn, save that Minnkota!!!
I second that in a big way.

For one thing the motor needs water cooling have you considered this?

My Minn Kota Maxxum 50# thrust is a dream machine to use. Only thing wrong I purchased a 83 pound trolling battery that was way too big in amp hour as I can run for three days at 3/4 power with plenty of battery left. Best part it all fits on a built up aluminum hand cart with pole holders, cooler, tackle box, battery, Minn Kota and extended power cord (battery forward in the boat) as a single portable unit. (Best part I cashed in my copper share from work made this a 100% free project. That electronic speed controller sure beats the old heating element resistor type speed controllers of years ago.

I did get a older solid state Minn Kota speed controller free from a service dealer used it on a electric 3/8 scale RC 23 "T" bucket project, added a 1/4 hp 12 volt DC motor. Perfect speed control from 0-100% power. That would be a better motor option for your grain mill.
__________________

Bier Jagdwaffe... Bier 30 zeit.....~~=o&o>..........


BrewBeemer is offline
 
Reply With Quote Quick reply to this message
Old 12-31-2008, 12:15 AM   #10
GilaMinumBeer
In yo' garage, steelin' yo parts.
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
GilaMinumBeer's Avatar
Recipes 
 
Join Date: Jan 2008
Location: Oblivion
Posts: 48,115
Liked 4829 Times on 4432 Posts
Likes Given: 59

Default

If it makes you feel any better. It is a MinnKota 35, 17 lb thrust 4 speed assembled in 1989 and hasn't seen the transom of a boat in nearly a decade. For the juice I have a monster StowAway 800CCA.

It was the Minnkota TM or the 79' Monkey Ward 5hp Outboard pull start.

Frankly, I think the latter has too much torque but I do also have a 75cc weed wacker motor too.

__________________

GilaMinumBeer is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pot for Glass top range Neurot Equipment/Sanitation 22 11-06-2009 05:02 PM
Stock pot range anyone? ChshreCat Equipment/Sanitation 9 07-13-2009 05:46 PM
Which end of given temperature range is the most ideal? GabrielKnight Beginners Beer Brewing Forum 9 04-13-2009 05:09 PM
$15.00 price range? Papinquack General Beer Discussion 51 01-18-2009 06:47 AM
Corny Keg price range prey Equipment/Sanitation 6 07-10-2007 09:55 PM