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@GilaMinumBeer: Yes, malt is grain. But you know what I mean. Grain mills usually intend to produce flour. But, it might be usable if it in fact can produce results similar to the Corona (however, I wouldn't buy it based on that assumption, the coarsest setting still may be just flour). And that...

@GilaMinumBeer: Yeah, well that's a grain mill not a malt mill. I'm willing to bet that grinds and not crushes (you can see from the design that it probably has a conical grinding 'wheel'). But still, that, but with with a pair of short rollers instead, is exactly what I mean :)

And I'm arguing that compared to other motorized mills, it is considerably smaller. Thanks though! Thanks! Yes, I really don't think I'd mind hand cranking either... Hmm.. Ah well, I'm almost done now :) Maybe a steam powered mill? Then you could use the hot water to dough in with :)

This morning I fabricated another pair of perspex plates and got the gap down to 1.7mm. That is probably as small gap as it gets with the gears I'm using. That still gives a very coarse crush, but I hope that with overnight mashing efficiency won't take too much of a hit. I already know that...

It probably is. But you'd still need to be *there*, cranking it. That said, I like the corona mill. Well, thanks! Your encouragement really makes me want to share more of my progress on this project. Not. How about you show me *your* motorized roller mill, built only from off the shelf...

Finally the last needed parts arrived. I'll just post a vid here for now. Still work in progress, but pretty much 'there', just some tweaks left to do. (Sorry for the vid being sidways. The gyro in the tablet is borked.) I have put two knurling rollers on each shaft now. Had trouble with...

No, you are unfortunately (for the OP) correct. Beer is too acidic and will eat away at the copper. Not good for the beer and the coil.

Here ya go. Can't think of anything more manly to drink out of than this plastic stein :)

Maybe something @Jaybird can do? See this thread: https://www.homebrewtalk.com/showthread.php?t=582539

I don't have any data on that either, but I really don't think there is any significant heating of the malt from milling. Just touch the freshly milled malt. Does it feel hot? Malt is crushed, flour is ground. I'd expect grinding would produce more heat from friction. But that i just my...

Still... Wind will probably not be significant factor when sizing motor and gear ratio for a malt mill. But you are correct in that the sizing the motor and gear ratio is the key. I'm personally building a malt mill from scratch, that will be powered by an 8W motor (or about 1/100th of a horse...

Yes, you'd lose torque. At twice the speed, you'll have half the torque. You do NOT need 100+ RPM. Slower is better (and well... slower). You just want to stay below a few hundred RPM's to minimize tearing. So the 150-250 RPM that can be seen often quoted as "optimal" is, well..., not wrong, it...

Glanced over the code, even though I already know why that happens (from your description). SP is handled differently in minute FW. It is buffered in memory and not written to EEPROM for every change when running a profile to prevent excessive EEPROM wear. But setting a new SP value only updates...

That is not an A400_P board (and it does not have the correct MCU). Contact the seller to get it sorted.

I haven't even seen a grainfather IRL, so hopefully someone else can contribute some useful info to you (like @kaljade perhaps?). The pump is probably easies to hook up with an SSR, just like kaljade shows a few pages back in this thread. Regarding the parameters, I can't really help with the...

That is the right one. It is the A400_P part that is important. The v1.1 is just the revision of that type of PCB (it got a bit confused before). So you're good!

Beer.

Good that it is working, but that does not sound right. Is your voltmeter ok? It really should output around 12-14v when 'on' and close to 0v when 'off'.

The wiring looks about right to me. I assume then you have set cO to 200, but have you set run mode (rUn) to constant output (Co)? Otherwise there won't be any output (you've only specified what output to use when in constant output mode). If this is not the issue, then recheck the soldering...

That is not nearly enough information to troubleshoot. First of all, is it supposed to output anything? Is the heating or cooling LED lit? Secondly, how do you measure the output? Thirdly, exactly what have you done so far? A picture or two could help. If it worked before, and you have made the...