Register Now!
The HomeBrew Forum > Beer Brewing Talk > Beer Brewing "How-To" Guides > How to build a stir plate for less than ten quid

Help Support The Homebrew Forum by donating using the link above or becoming a Supporting Member.
Reply
 
Thread Tools Display Modes
Old 06-10-2016, 08:12 PM   #21
strange-steve
Quantum Brewer
 
strange-steve's Avatar
 
Join Date: Apr 2014
Location: Galle Crater, Mars
Posts: 1,972
Liked 947 Times on 631 Posts
Likes Given: 299

Default

Quote:
Originally Posted by Martybhoy1980 View Post
Good guide. I'm definitely considering doing this to increase my yield.

What size of stirrer did you use?
Fwiw I'm actually going to order one of these stir bars to use instead. I found the one I have with the little ridge around the center is quite noisy when going at speed and it is rather irritating. The one I've linked to here apparently solves that problem.
__________________
"We're all puppets... I'm just a puppet who can see the strings."
strange-steve is online now  
 
Reply With Quote
Old 06-10-2016, 08:14 PM   #22
strange-steve
Quantum Brewer
 
strange-steve's Avatar
 
Join Date: Apr 2014
Location: Galle Crater, Mars
Posts: 1,972
Liked 947 Times on 631 Posts
Likes Given: 299

Default

Quote:
Originally Posted by IainM View Post
I've got all the parts except the stirrer now. Hopefully I can get it ready in time to build up some Wyeast American Ale II for my upcoming Black IPA.
Good work, I used mine a couple of weeks ago for the first time for a black IPA. The stir plate worked great, the beer not quite so great
__________________
"We're all puppets... I'm just a puppet who can see the strings."
strange-steve is online now  
 
Reply With Quote
Old 08-10-2016, 09:41 AM   #23
cheapbrew
Junk and disorderly
 
cheapbrew's Avatar
 
Join Date: Nov 2015
Location: The Spout of Herts
Posts: 1,515
Liked 555 Times on 432 Posts
Likes Given: 674

Default

The last part arrived in the post this morning so I hope to finally put this together now, I'm gonna use a plastic food tub until I can find a better box.
cheapbrew is offline  
 
Reply With Quote
Old 08-10-2016, 10:49 AM   #24
cheapbrew
Junk and disorderly
 
cheapbrew's Avatar
 
Join Date: Nov 2015
Location: The Spout of Herts
Posts: 1,515
Liked 555 Times on 432 Posts
Likes Given: 674

Default

I've wired the power supply to the controller power input and the controller motor output to the fan, but the fan only starts turning when the knob is turned almost full on, and the fan comes on flat out and if I turn the knob back just a fraction it stops, there is not really any control of fan speed?

If I'm really careful with turning the knob I can get it going a bit slower but not much, I managed to get it going slower once and it squeaked like crazy and got slower and slower and eventually stops,

Anyone have any ideas?
Roughly what speed should it spin at?
cheapbrew is offline  
 
Reply With Quote
Old 08-10-2016, 01:24 PM   #25
JapanBrew
Senior Member
 
JapanBrew's Avatar
 
Join Date: Oct 2015
Posts: 1,290
Liked 367 Times on 303 Posts
Likes Given: 476

Default

Could it be that some fans are rated for 12v only while other fans fun from 5v to 12?
JapanBrew is offline  
 
Reply With Quote
Old 08-10-2016, 01:43 PM   #26
strange-steve
Quantum Brewer
 
strange-steve's Avatar
 
Join Date: Apr 2014
Location: Galle Crater, Mars
Posts: 1,972
Liked 947 Times on 631 Posts
Likes Given: 299

Default

Quote:
Originally Posted by cheapbrew View Post
I've wired the power supply to the controller power input and the controller motor output to the fan, but the fan only starts turning when the knob is turned almost full on, and the fan comes on flat out and if I turn the knob back just a fraction it stops, there is not really any control of fan speed?

If I'm really careful with turning the knob I can get it going a bit slower but not much, I managed to get it going slower once and it squeaked like crazy and got slower and slower and eventually stops,

Anyone have any ideas?
Roughly what speed should it spin at?
Not sure why this is. With mine I have to turn the controller up to about 75% to start the fan but then I can turn it down quite a lot. I can get it spinning as low as 1 or 2 reps per second. Presumably you've checked that nothing is touching the fan or adding friction anywhere? It definitely shouldn't squeak, it should turn very easily.
__________________
"We're all puppets... I'm just a puppet who can see the strings."
strange-steve is online now  
 
Reply With Quote
Old 08-10-2016, 01:44 PM   #27
strange-steve
Quantum Brewer
 
strange-steve's Avatar
 
Join Date: Apr 2014
Location: Galle Crater, Mars
Posts: 1,972
Liked 947 Times on 631 Posts
Likes Given: 299

Default

Quote:
Originally Posted by JapanBrew View Post
Could it be that some fans are rated for 12v only while other fans fun from 5v to 12?
I don't think so because technically a pwm doesn't lower the voltage it just switches it off and on quickly.
__________________
"We're all puppets... I'm just a puppet who can see the strings."
strange-steve is online now  
 
Reply With Quote
Old 08-10-2016, 06:24 PM   #28
cheapbrew
Junk and disorderly
 
cheapbrew's Avatar
 
Join Date: Nov 2015
Location: The Spout of Herts
Posts: 1,515
Liked 555 Times on 432 Posts
Likes Given: 674

Default

After trying another power supply and then testing the controller with a bulb, I finally tracked down the problem to the fan, I dug out another fan and it works beautifully now (sp don't buy the fan linked in the parts list) and just as strange said it needs a bit more than halfway to start against the torque of the motor but once its spinning I can slow it right down. Happy days!

The only question now is I can spin it with no visible vortex, or with a vortex going right down to the stir bar as in strange's picture in OP, but I think it needs to be about an inch or so vortex from the top just like in Jamie's photo in post 6 above?
cheapbrew is offline  
 
Reply With Quote
Old 08-10-2016, 07:08 PM   #29
strange-steve
Quantum Brewer
 
strange-steve's Avatar
 
Join Date: Apr 2014
Location: Galle Crater, Mars
Posts: 1,972
Liked 947 Times on 631 Posts
Likes Given: 299

Default

Quote:
Originally Posted by cheapbrew View Post
After trying another power supply and then testing the controller with a bulb, I finally tracked down the problem to the fan, I dug out another fan and it works beautifully now (sp don't buy the fan linked in the parts list) and just as strange said it needs a bit more than halfway to start against the torque of the motor but once its spinning I can slow it right down. Happy days!

The only question now is I can spin it with no visible vortex, or with a vortex going right down to the stir bar as in strange's picture in OP, but I think it needs to be about an inch or so vortex from the top just like in Jamie's photo in post 6 above?
Glad you got it working, it's a shame about the faulty fan. The one in the link is the exact one I got, I suppose for that price the quality isn't gonna be amazing, but it should at least work.

As for the vortex, I believe you are correct, only a small dimple is required. It's main function is to keep the yeast in suspension so a fairly gentle stir is good enough.
__________________
"We're all puppets... I'm just a puppet who can see the strings."
strange-steve is online now  
 
Reply With Quote
Old 08-10-2016, 08:30 PM   #30
chimpo
Member
 
chimpo's Avatar
 
Join Date: May 2016
Posts: 67
Liked 29 Times on 23 Posts
Likes Given: 13

Default

Quote:
Originally Posted by strange-steve View Post
Not sure why this is. With mine I have to turn the controller up to about 75% to start the fan but then I can turn it down quite a lot.
You need to turn it up to get the starting torque once its spinning it requires very little torque hence u can trim down the pot ( voltage divider)
chimpo is offline  
 
Reply With Quote
Reply

Tags
cheap stir plate, how to make stir plate, stir plate

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY Stir Plate RZH General Beer Brewing Equipment Discussion 3 15-01-2016 07:04 PM
Big stir plate! McMullan The Snug 3 15-12-2015 05:21 PM
Budget Stir Plate Build HisDudeness General Beer Brewing Equipment Discussion 24 08-12-2015 10:41 PM
Stir plate. dennisking General Beer Brewing Equipment Discussion 6 02-01-2014 01:30 PM
DIY Stir Plate will_raymo2000 General Beer Brewing Equipment Discussion 2 06-07-2011 11:07 PM

Newest Threads