Author Topic: Garage door opener  (Read 9212 times)

Offline euge

  • I must live here
  • **********
  • Posts: 7658
  • Estilo Casero
    • View Profile
Garage door opener
« on: July 13, 2012, 11:00:41 PM »
I have an old Craftsman garage door opener laying in my garage that needs to go. I'm wondering if the motor would be right for running my Barley Crusher.

It already has a sprocket and I might be able to use part of the chain if the links can come apart. All I'd need is another one for the mill.

Ideas? Suggestions?
The first principle is that you must not fool yourself, and you are the easiest person to fool. -Richard P. Feynman

Offline tschmidlin

  • I must live here
  • **********
  • Posts: 8197
  • Redmond, WA
    • View Profile
Re: Garage door opener
« Reply #1 on: July 13, 2012, 11:04:13 PM »
Hmmm . . . I've never looked inside one, but in my mind it would turn your mill really slowly.  What kind of RPMs do you get out of it?
Tom Schmidlin

Offline euge

  • I must live here
  • **********
  • Posts: 7658
  • Estilo Casero
    • View Profile
Re: Garage door opener
« Reply #2 on: July 13, 2012, 11:30:52 PM »
I don't know it came with the house. The sprocket diameter is pretty small on these things, but I'm looking for maybe 200 rpm at the mill.
The first principle is that you must not fool yourself, and you are the easiest person to fool. -Richard P. Feynman

Offline tschmidlin

  • I must live here
  • **********
  • Posts: 8197
  • Redmond, WA
    • View Profile
Re: Garage door opener
« Reply #3 on: July 13, 2012, 11:37:25 PM »
You'll need to put a much larger sprocket on the motor then, and move the small one to the mill.  I'd measure the RPM of the motor and then do some math to see if it even makes sense.
Tom Schmidlin

Offline weithman5

  • Senior Brewmaster
  • ******
  • Posts: 1681
  • naperville, il
    • View Profile
Re: Garage door opener
« Reply #4 on: July 14, 2012, 03:59:02 AM »
i would play with it, bet it would work fine, with a little eugenuity.
Don AHA member

Offline hopfenundmalz

  • Official Poobah of No Life.
  • *
  • Posts: 6306
  • Milford, MI
    • View Profile
Re: Garage door opener
« Reply #5 on: July 14, 2012, 05:19:03 AM »
The only drawback is that a chain will not slip like a belt if a small rock gets into the rollers. I had one bag of British malt that had 4 small rocks in it.
Jeff Rankert
Ann Arbor Brewers Guild, AHA Member, BJCP Certified
Home-brewing, not just a hobby, it is a lifestyle!

Offline weithman5

  • Senior Brewmaster
  • ******
  • Posts: 1681
  • naperville, il
    • View Profile
Re: Garage door opener
« Reply #6 on: July 14, 2012, 06:20:25 AM »
if you have to pull the sprocket off you could probably mount a pully to use a belt instead of a chain. in fact that would probably be easier than adjusting chain length anyway.
Don AHA member

Offline euge

  • I must live here
  • **********
  • Posts: 7658
  • Estilo Casero
    • View Profile
Re: Garage door opener
« Reply #7 on: July 14, 2012, 09:20:41 AM »
I was thinking belt pulley too. Thinking back to analytical geometry... would a larger diameter pulley on the mill side make it work more efficiently?
The first principle is that you must not fool yourself, and you are the easiest person to fool. -Richard P. Feynman

Offline Jimmy K

  • Official Poobah of No Life.
  • *
  • Posts: 3629
  • Delaware
    • View Profile
Re: Garage door opener
« Reply #8 on: July 14, 2012, 03:08:48 PM »
I was thinking belt pulley too. Thinking back to analytical geometry... would a larger diameter pulley on the mill side make it work more efficiently?

Define efficient. A larger wheel on the motor will increase rpm. A larger wheel on the mill end will decrease rpm.
 
Mill RPM = Motor RPM * (Motor Pulley Diameter / Mill Pulley Diameter)
Delmarva United Homebrewers - President by inverse coup - former president ousted himself.
AHA Member since 2006
BJCP Certified: B0958

Offline bluesman

  • Global Moderator
  • I must live here
  • *****
  • Posts: 8808
  • Delaware
    • View Profile
Garage door opener
« Reply #9 on: July 14, 2012, 04:39:20 PM »
The ideal speed for a mill is 400rpm.  You would need to make a design change to allow for more rpm at the motor.  This would likely involve a larger drive pulley at the motor side. Again, you'll need to calculate the size pulley needed to drive the mill at approx. 400 rpm. 
Ron Price

Offline Thirsty_Monk

  • Brewmaster General
  • *******
  • Posts: 2205
  • Eau Claire WI
    • View Profile
Re: Garage door opener
« Reply #10 on: July 14, 2012, 05:40:11 PM »
The only drawback is that a chain will not slip like a belt if a small rock gets into the rollers. I had one bag of British malt that had 4 small rocks in it.
Those pesky Brits. The same happened to me with MO malt.
Na Zdravie

On Tap At The TapRoom:
Bohemian Pilsner
Bohemian Dark Lager
Smoked Bock
MaiBock
American Brown Ale
Marzen
Root beer

Offline hopfenundmalz

  • Official Poobah of No Life.
  • *
  • Posts: 6306
  • Milford, MI
    • View Profile
Re: Garage door opener
« Reply #11 on: July 14, 2012, 07:10:29 PM »
The only drawback is that a chain will not slip like a belt if a small rock gets into the rollers. I had one bag of British malt that had 4 small rocks in it.
Those pesky Brits. The same happened to me with MO malt.

My conclusion was that the maltser needed to change some of the filter screens, must of had a hole in one.
Jeff Rankert
Ann Arbor Brewers Guild, AHA Member, BJCP Certified
Home-brewing, not just a hobby, it is a lifestyle!

Offline punatic

  • Official Poobah of No Life.
  • *
  • Posts: 4583
  • Puna District, Hawaii Island (UTC -10)
    • View Profile
Re: Garage door opener
« Reply #12 on: July 14, 2012, 09:34:43 PM »
The ideal speed for a mill is 400rpm.  You would need to make a design change to allow for more rpm at the motor.  This would likely involve a larger drive pulley at the motor side. Again, you'll need to calculate the size pulley needed to drive the mill at approx. 400 rpm.

Can you share where the 400 RPM number comes from?  6 and 2/3 revs per second seems a bit fast to me.
There is only one success: to be able to spend your life in your own way.


AHA Life Member #33907

Offline weithman5

  • Senior Brewmaster
  • ******
  • Posts: 1681
  • naperville, il
    • View Profile
Re: Garage door opener
« Reply #13 on: July 15, 2012, 04:12:28 AM »
i am more curious how speed affects the crush.  if 400rpm is ideal, there are a lot of hand millers suffering.
Don AHA member

Offline jeffy

  • I spend way too much time on the AHA forum
  • ********
  • Posts: 2879
  • Tampa, Fl
    • View Profile
Re: Garage door opener
« Reply #14 on: July 15, 2012, 04:59:56 AM »
I'm happy with my crush and I have the mill turning way slower than that.
I use a DC motor from a tread mill and chose a very large pulley for the grain mill to save the motor from too much stress.
Jeff Gladish, Tampa (989.3, 175.1 Apparent Rennarian)
Homebrewing since 1990
AHA member since 1991, now a lifetime member
BJCP judge since 1995