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lovepotion
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Re: How to make a _good_ magnetic stirrer for cheap [Re: starbones]
#26896153 - 08/23/20 11:07 PM (3 years, 5 months ago) |
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good luck out there pal
-------------------- Staying Out to Lunch
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dothedew69
Relearning



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Re: How to make a _good_ magnetic stirrer for cheap [Re: Blue Helix] 1
#26909682 - 08/31/20 12:42 PM (3 years, 4 months ago) |
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I made one of these too but I ran into some issues and I figured it was probably due to the lid size. When I used the jar and put a hole in the lid I couldn’t tighten the lid down. So I used a forstner 1/2 bit and cut a hole in it which fit the entire motor through and after wiring it, it stuck up like 1/16 of an inch which allowed me to glue it to the lid to be stationary. I put some caulk on the bottom so it would be extra secured and cushioned as well. Buuuut, ran into another problem, now with the added height the metal lid with weights was hitting the top of the second lid. Found some styrofoam laying around and cut some pieces to act as spacers. Glued the top spinning lid down with my magnets and then glued the top lid to the styrofoam. I will have to take it apart however, the magnets I used were way too big and way too powerful so I ordered some 15mmx3mm magnets to replace it, going to use 3 of them. But considering how it is now it works perfect. When I make my few changes I’m going to shave the foam down and wrap the thing in colored craft foam for a nice finished look. Here’s how it looks right now, it works beautifully thank you!
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Blue Helix
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Re: How to make a _good_ magnetic stirrer for cheap [Re: starbones]
#26930106 - 09/11/20 02:34 PM (3 years, 4 months ago) |
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Quote:
starbones said:

Hey, before the total drivel above that I basically skimmed over, the troll dude does show an interesting picture of slow spinning culture. That actually was interesting. Can anyone else with the maturity of an adult confirm this speed from a unit under $30?
So all I need is (a) the exact model your purchased, (b) an animation demonstrating the magnet's turning speed at the lowest stable setting (not the LC's turning speed but the magnet's), (c) the total price including shipping, and (c) the source of your purchase.
I'd love nothing more than to close this discussion with a commercial alternative for a reasonable price. I couldn't find it, but since troll man likes to show pictures but leave somewhat critical details unsaid, I need you all to help me.
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Blue Helix
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Re: How to make a _good_ magnetic stirrer for cheap [Re: dothedew69]
#26930282 - 09/11/20 03:58 PM (3 years, 4 months ago) |
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Quote:
dothedew69 said: I made one of these too but I ran into some issues and I figured it was probably due to the lid size. When I used the jar and put a hole in the lid I couldn’t tighten the lid down. So I used a forstner 1/2 bit and cut a hole in it which fit the entire motor through and after wiring it, it stuck up like 1/16 of an inch which allowed me to glue it to the lid to be stationary. I put some caulk on the bottom so it would be extra secured and cushioned as well. Buuuut, ran into another problem, now with the added height the metal lid with weights was hitting the top of the second lid. Found some styrofoam laying around and cut some pieces to act as spacers. Glued the top spinning lid down with my magnets and then glued the top lid to the styrofoam. I will have to take it apart however, the magnets I used were way too big and way too powerful so I ordered some 15mmx3mm magnets to replace it, going to use 3 of them. But considering how it is now it works perfect. When I make my few changes I’m going to shave the foam down and wrap the thing in colored craft foam for a nice finished look. Here’s how it looks right now, it works beautifully thank you!

Yeah, it's REALLY tight in that half-pint jar and the second lid for that matter. I almost just wrote that folks should use a full pint jar with a spacer of some sort for the lid. How ever you got it to work, though, congrats!
Edited by Blue Helix (09/11/20 04:06 PM)
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
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Re: How to make a _good_ magnetic stirrer for cheap [Re: Blue Helix]
#26930297 - 09/11/20 04:08 PM (3 years, 4 months ago) |
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Quote:
Blue Helix said: It has come to my attention that at this point, this thread is useless. Essentially people are just trolling me, and getting a kick out of my reaction. Toward that end and because I'm such a nice guy, let me provide one last absurd post for the enjoyment of the trolls, okay?
While I'm glad I can provide some meager level of entertainment to you, I actually find it kind of annoying and, ultimately, boring personally. If someone would like to message me with an alternative commercial magnetic stirrer that is inexpensive (say less than $20) and doesn't spin over say 200 RPM, I would be greatly appreciative, but I somehow doubt that will happen (in the same way I doubt anyone reading this has achieved 320% biological efficiency as I have). I'm out of here.
*mic drop*
Jesus dude grow up. One random person made you cry this much... And you're still going on about it. Ignore the fucking guy lol. All he did was post a very reasonable reply. Why would you build this if you can get something as good or better for under 50
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JHOVA
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Re: How to make a _good_ magnetic stirrer for cheap [Re: Blue Helix]
#26930303 - 09/11/20 04:11 PM (3 years, 4 months ago) |
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-------------------- 🅃 🄴 🄰 🄼 🄲 🄻 🄸 🄽 🄶 🅆 🅁 🄰 🄿
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CubePusher
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Re: How to make a _good_ magnetic stirrer for cheap [Re: Blue Helix]
#26930307 - 09/11/20 04:14 PM (3 years, 4 months ago) |
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Any thoughts on a design that could stir like 16 jars at once on the cheap? Just a thought. Probably best to go with a bunch of cheap fans running through some sort of speed controller at that point, right?
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verum subsequentis
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Re: How to make a _good_ magnetic stirrer for cheap [Re: CubePusher]
#26930312 - 09/11/20 04:17 PM (3 years, 4 months ago) |
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This post is strange to me. Your name is "cube pusher", you have 12 posts and you want a stir plate that stirs 16 at a time. hmmmmm
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bodhisatta 
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Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: How to make a _good_ magnetic stirrer for cheap [Re: CubePusher]
#26930315 - 09/11/20 04:19 PM (3 years, 4 months ago) |
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Not cheap but automotive paint used to mostly be stored in these mixing banks/cabinets
https://byrdsautomotive.com
They're constantly stirred by one motor attached to a drivetrain that goes to a stiring bar for each jar
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CubePusher
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Re: How to make a _good_ magnetic stirrer for cheap [Re: bodhisatta]
#26930332 - 09/11/20 04:27 PM (3 years, 4 months ago) |
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Quote:
verum subsequentis said: This post is strange to me. Your name is "cube pusher", you have 12 posts and you want a stir plate that stirs 16 at a time. hmmmmm
It's a play on squarepusher (musician), that math almost checked out though lol
Quote:
bodhisatta said: Not cheap but automotive paint used to mostly be stored in these mixing banks/cabinets
https://byrdsautomotive.com
They're constantly stirred by one motor attached to a drivetrain that goes to a stiring bar for each jar
Creative idea but waaaay too pricey and I'm hoping for something with a relatively small form factor, like a tray I could fit on a shelf.
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bodhisatta 
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Posts: 61,889
Loc: Milky way
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Re: How to make a _good_ magnetic stirrer for cheap [Re: CubePusher] 1
#26930338 - 09/11/20 04:31 PM (3 years, 4 months ago) |
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I think if you had a shop that made tinkering cheap for you that you could take one motor and have it drive 16 spinning chucks that each hold a magnet
like an arthur ganson style machine of sorts.
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Blue Helix
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Re: How to make a _good_ magnetic stirrer for cheap [Re: dothedew69]
#26930342 - 09/11/20 04:33 PM (3 years, 4 months ago) |
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Quote:
dothedew69 said: I made one of these too but I ran into some issues and I figured it was probably due to the lid size. When I used the jar and put a hole in the lid I couldn’t tighten the lid down. So I used a forstner 1/2 bit and cut a hole in it which fit the entire motor through and after wiring it, it stuck up like 1/16 of an inch which allowed me to glue it to the lid to be stationary. I put some caulk on the bottom so it would be extra secured and cushioned as well. Buuuut, ran into another problem, now with the added height the metal lid with weights was hitting the top of the second lid. Found some styrofoam laying around and cut some pieces to act as spacers. Glued the top spinning lid down with my magnets and then glued the top lid to the styrofoam. I will have to take it apart however, the magnets I used were way too big and way too powerful so I ordered some 15mmx3mm magnets to replace it, going to use 3 of them. But considering how it is now it works perfect. When I make my few changes I’m going to shave the foam down and wrap the thing in colored craft foam for a nice finished look. Here’s how it looks right now, it works beautifully thank you!
A couple quick questions: which motor (RPM @ what voltage) and what voltage did you use to it? And is it almost silent? A big problem I've had in the past with gear head motors is sound. Some of them can be outright loud if running at the full RPM, so that's why I was asking.
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Blue Helix
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Re: How to make a _good_ magnetic stirrer for cheap [Re: JHOVA]
#26930348 - 09/11/20 04:39 PM (3 years, 4 months ago) |
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Quote:
JHOVA said: https://www.amazon.com/ANZESER-Magnetic-Stirrer-Stirring-Capacity/dp/B07J59QVGQ/ref=mp_s_a_1_3?dchild=1&keywords=anzeser+magnetic+stirrer&qid=1599862065&sprefix=anzes&sr=8-3
Its $30 shipped.
Wow, I had no idea this request would be so incredibly difficult for folks. Let me review what I asked:
(a) the exact model your purchased (b) an animation demonstrating the magnet's turning speed at the lowest stable setting (not the LC's turning speed but the magnet's) (c) the total price including shipping, and (c) the source of your purchase.
Now arguably you provided (a) and (c) but the money shot is (b). Like I said, I've ordered two such spinners and they are now in a landfill somewhere.
Again, has anyone bought this exact spinner and have photographic non-altered animation evidence of it running around 100 to 200 RPM? I don't want GIF manipulated animations and stuff. Yes, I can do that myself through a simple animated GIF editor. I want someone who would be kind enough to confirm this.
PS - I don't want 16 spinners. Believe it or not, I had an four spinner one already. I HATED IT! Let me rephrase that: it was loud as fuck and I instantly smashed it with a hammer for the magnets (and the motor was so shitty that I just tossed it). Got the picture? Quiet matters to me more than 4, 8, 16 32, 64, or 128 spinners. I usually have one or two LC going here; I'm not a mushroom lab. And I have to sleep in the room they are spinning, and I am a very light sleeper. The leaves rustling outside can wake me up.
Edited by Blue Helix (09/11/20 04:45 PM)
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bodhisatta 
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Loc: Milky way
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Re: How to make a _good_ magnetic stirrer for cheap [Re: Blue Helix]
#26930356 - 09/11/20 04:45 PM (3 years, 4 months ago) |
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Doctored gifs
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Blue Helix
bold hand


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Re: How to make a _good_ magnetic stirrer for cheap [Re: bodhisatta]
#26930358 - 09/11/20 04:47 PM (3 years, 4 months ago) |
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Quote:
bodhisatta said: Doctored gifs 
Oh, it's a thing! I'll show you the one I like:
https://ezgif.com/
Those guys are awesome. You can make a porno with the load lasting a full five minutes with them! j/k I'm not interested in seeing that.
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JHOVA
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Re: How to make a _good_ magnetic stirrer for cheap [Re: Blue Helix]
#26930364 - 09/11/20 04:51 PM (3 years, 4 months ago) |
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You really are something else and i thought my wife was demanding and emotional. I use LI and syringes npt LC, and i looked up the stir plate as a favor to the readers. You can take it from here chief.
-------------------- 🅃 🄴 🄰 🄼 🄲 🄻 🄸 🄽 🄶 🅆 🅁 🄰 🄿
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Blue Helix
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Re: How to make a _good_ magnetic stirrer for cheap [Re: JHOVA]
#26930388 - 09/11/20 05:03 PM (3 years, 4 months ago) |
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Quote:
JHOVA said: You really are something else and i thought my wife was demanding and emotional. I use LI and syringes npt LC, and i looked up the stir plate as a favor to the readers. You can take it from here chief.
Okay and thank you for calling me chief - makes me feel more important than Trusted Cultivator. Maybe I could become the Trusted Cultivator Chief or TCC? Hey gotta dream big you know!
Well, if anyone could show it off in an animation, that would be great. Given I think LCs are the best thing since sliced bread, I'm really curious about it. $30 is right at the border between "Kind of pricey for a spinning magnet" and "We know you need this so we will now totally rip you off with the old 'lab equipment' serious sounding shtick". I'd rather see it at $20 but even at $30 it sounds pretty good if it works just perfectly.
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CubePusher
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Re: How to make a _good_ magnetic stirrer for cheap [Re: bodhisatta]
#26930516 - 09/11/20 06:17 PM (3 years, 4 months ago) |
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Quote:
Blue Helix said: PS - I don't want 16 spinners. Believe it or not, I had an four spinner one already. I HATED IT! Let me rephrase that: it was loud as fuck and I instantly smashed it with a hammer for the magnets (and the motor was so shitty that I just tossed it). Got the picture? Quiet matters to me more than 4, 8, 16 32, 64, or 128 spinners. I usually have one or two LC going here; I'm not a mushroom lab. And I have to sleep in the room they are spinning, and I am a very light sleeper. The leaves rustling outside can wake me up.
Understandable, I was just looking for ideas. Noise isn't as much of an issue for me as that stuffs nowhere near my bedroom. I'd like that kind of capacity for the gourmets though. Thanks for your write ups lately by the way, that LC looks bomb.
Quote:
bodhisatta said: I think if you had a shop that made tinkering cheap for you that you could take one motor and have it drive 16 spinning chucks that each hold a magnet
like an arthur ganson style machine of sorts.
Good idea, there's a shop down the road I'm friendly with. Might have to spend a few evenings there.
Edited by CubePusher (09/11/20 06:39 PM)
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Blue Helix
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Re: How to make a _good_ magnetic stirrer for cheap [Re: CubePusher]
#26930593 - 09/11/20 07:00 PM (3 years, 4 months ago) |
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Quote:
CubePusher said:
Quote:
Blue Helix said: PS - I don't want 16 spinners. Believe it or not, I had an four spinner one already. I HATED IT! Let me rephrase that: it was loud as fuck and I instantly smashed it with a hammer for the magnets (and the motor was so shitty that I just tossed it). Got the picture? Quiet matters to me more than 4, 8, 16 32, 64, or 128 spinners. I usually have one or two LC going here; I'm not a mushroom lab. And I have to sleep in the room they are spinning, and I am a very light sleeper. The leaves rustling outside can wake me up.
Understandable, I was just looking for ideas. Noise isn't as much of an issue for me as that stuffs nowhere near my bedroom. I'd like that kind of capacity for the gourmets though. Thanks for your write ups lately by the way, that LC looks bomb.
Quote:
bodhisatta said: I think if you had a shop that made tinkering cheap for you that you could take one motor and have it drive 16 spinning chucks that each hold a magnet
like an arthur ganson style machine of sorts.
Good idea, there's a shop down the road I'm friendly with. Might have to spend a few evenings there.
The 4-spinner one I had also wasn't working very well because the drive belt was skipping. No doubt that was making it a lot louder. It was actually kind of cool inside, though. There was a motor with a rubber belt (like a timing belt in a car but smaller, of course, and without teeth) that delivered torque to all four magnets with a pully of sorts. The issue was that I think the belt had stretched over the probably decade and a half it was in service, and there wasn't a tension adjustment. And the motor itself was loud and sounded like it was on its way out. I am sure it was wildly expensive when new, though. I'm thinking easily over $400.
I actually wouldn't mind a four-spinner unit using the motor in this write up. Maybe I'll throw something together, but my main point with the write up was to kind of demystify these spinners and put a plug in for cheap gear head motors that can direct drive the magnet at the lower RPMs. I know you can spend $300 down to (so I am told) $30 on one or find them at used lab equipment places or through brewing supplies, but fundamentally they are very simple devices. And it is worth it to get one rather than use a marble if you are half serious about LC techniques. They really do make a difference.
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sonoramo
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Re: How to make a _good_ magnetic stirrer for cheap [Re: Blue Helix]
#26972960 - 10/06/20 09:46 PM (3 years, 3 months ago) |
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Nice write-up. I see that you bought a large number of large Teflon-coated stir bars. On Amazon, they seem kind of expensive for just a piece of steel covered in plastic! Is there a cheaper source?
My home-made ones are a 2cm-long piece of 1/4 inch mild steel rod (6.2mm dia), with two of those same small NdFe craft magnets self-stuck on each end. These cost about $6 for 100 pieces, good for dozens of stir bars plus random crafts and so on. I'm careful to get the two magnets pointing in the same direction. That means they are oriented N-S--N-S, with the steel bar between. They will stick to the steel even if they point N-S--S-N, but then their net dipole moment is small and they don't lock to the stirrer very well.
One problem with this is that the NdFe actually corrodes a bit in solution. It looks ugly but I don't think it actually hurts the culture.
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