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Old 07-12-2014, 10:26 PM   #1
Smellyglove
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Default Grain mill shaft and lovejoy couplings

I'm looking into motorizing my mill. First brew with the new mill (MM3 2.0) consisted of 90 minutes of grinding for a 10gal batch...

I slaughtered a kitchen-appliance and took out the motor and gears.

After doing some research here i understood that lovejoys are the way to go. I've read some build-threads but I'm missing one thing.

It seems like the lovejoys have a hole on their side. Does this mean I have to drill a hole in the shaft of the grainmill, and use some sort of locking pin through it?

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Old 07-12-2014, 11:10 PM   #2
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The hole on the side has a set screw in it. you put it onto the shaft then tighten it down. If your mill shaft has a flat side you line the flat side up with that screw.

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Old 07-12-2014, 11:24 PM   #3
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Quote:
Originally Posted by Chrisl77 View Post
The hole on the side has a set screw in it. you put it onto the shaft then tighten it down. If your mill shaft has a flat side you line the flat side up with that screw.
Aha! Excellent. Thanks!

But a lovejoy will work no problem with a shaft which has three flat grooves, for a drill-chuck?

And. How snug must it be to work? The gear-shaft is in mm. It's 12mm. 1/2" is 12.7mm. 0.7mm is 0.0275591 inches. Will it work?
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Old 07-13-2014, 12:51 AM   #4
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Quote:
Originally Posted by Smellyglove View Post
But a lovejoy will work no problem with a shaft which has three flat grooves, for a drill-chuck?
Some folks file a little bit wider flat on one of the sides so the screw has more area to bite. But yes, they work with that style shaft.


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And. How snug must it be to work? The gear-shaft is in mm. It's 12mm. 1/2" is 12.7mm. 0.7mm is 0.0275591 inches. Will it work?
That's the really cool thing about spider couplings like the ones from Lovejoy, they're available in lots of different shaft sizes, including metric! Just get one that's 12mm. They don't have to be the same size on both halves. The halves just have to be from the same series so the center spider fits with both sides.
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Old 07-13-2014, 12:56 AM   #5
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Quote:
Originally Posted by reynolds5520 View Post
Some folks file a little bit wider flat on one of the sides so the screw has more area to bite. But yes, they work with that style shaft.




That's the really cool thing about spider couplings like the ones from Lovejoy, they're available in lots of different shaft sizes, including metric! Just get one that's 12mm. They don't have to be the same size on both halves. The halves just have to be from the same series so the center spider fits with both sides.
Allright. I allready see myself grinding more than 5 grains at a time!

Guess I'll have to do some more searching then, the reason I asked was because I couln't find 12mm.
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Old 07-13-2014, 01:07 AM   #6
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Mcmaster Carr has them:

http://www.mcmaster.com/#6408k11/=st78h2

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Old 07-13-2014, 01:23 AM   #7
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And one final Q.

Will I be fine even if the gear-shaft has grooves in it? I don't know how to describe it (And I'm off work, hence no (camera)phone) but, sort of threads, just that they don't twist. They were there to keep the plastic I removed to stick. I can shave down an area to make the locking-screw to make a good contact. I just don't know if it's the screw which is the key element to making the lovejoy not to slip.

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Old 07-13-2014, 02:36 AM   #8
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The locking screw is the only thing that's going to keep the coupler from slipping. Your motor output shaft is splined, but you could file a flat for the screw. As long as the coupler doesn't slip or wobble you should be ok...

Cheers!

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Old 07-13-2014, 09:24 AM   #9
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Thanks!

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Old 07-13-2014, 06:07 PM   #10
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How many splines are on that shaft?

Lovejoy has a jaw for a 12mm shaft with four 1.8mm splines.

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