Knurling on a Mashmaster Mini Mill

[Smokomark]

9 minutes and 53 seconds for a 25kg sack.
That used to take around an hour.

And a way better looking crush

 

[Parks]

What gap Mark?

 

[Parks]

And two new rollers or one?

 

[Liam_snorkel]

Ok fellas i got them going, thank **** for grinding paste!

 

[Smokomark]

Two new rollers,Troy.
I tried .6 up to 1mm and thought .8 -.9 looked best.

 

[bradsbrew]

Haven't got mine yet, so wetting the grain it is.

 

[user 35653]

After reading the previous I'm worried about fitting these rollers and I'm assuming they're not coming with instructions?

 

[Zorco]

Two new rollers,Troy.
I tried .6 up to 1mm and thought .8 -.9 looked best.

Is the torque transferred to both fluted rollers by gears, like the original knurled rollers? Or is one of them passive - free spinning?

 

[Mardoo]

 

[Parks]

I lost all interest in the experiment worrying about the rollers fitting (sorry guys...) but after that my bushes fit perfectly - phew.

So it's definitely not everyone that has the problem with the new rollers fitting.

HOWEVER...

The keyed drive shaft is now longer than before so I'll have to adjust my coupling. The keyed section of the shaft is the same length but the section that sits in the bushing is longer by 15mm (making it 15mm longer overall).

 

[Ducatiboy stu]

Ok fellas i got them going, thank **** for grinding paste!

So you spend all afternoon lapping the monkey.....

 

[Ducatiboy stu]

HOWEVER...

The keyed drive shaft is now longer than before so I'll have to adjust my coupling. The keyed section of the shaft is the same length but the section that sits in the bushing is longer by 15mm (making it 15mm longer overall).

 

[Liam_snorkel]

I'm getting great crush at about 1.2mm. 18V cordless on low speed reverse it pulls through at about 1kg/25secs. Definitely faster than the original rollers ever did and seems to be less flour

 

[Liam_snorkel]

So you spend all afternoon lapping the monkey.....

Yeah mate it wasn't fun. The bastard bit me too.

Once I got them moving (but still stiff) I hooked it up to the drill with the grinding paste still in there until it rolled nicely. Then cleaned them out and applied some silicone lube.

 

[Ducatiboy stu]

A much better result than butchering it with a dremel.

 

[Batz]

I'm getting great crush at about 1.2mm. 18V cordless on low speed reverse it pulls through at about 1kg/25secs. Definitely faster than the original rollers ever did and seems to be less flour

ImageUploadedByAussie Home Brewer1453542771.208180.jpg

Looks like a good crush.

 

[Liam_snorkel]

Some feedback from Francis if anyone is having trouble fitting the new roller:

"I will be sending out some 180 and 240 grit quality sandpaper with replacement rollers soon, tolerance on the new rollers were a little tighter. its the difference between 0.07 and 0.018mm approximately."

 

[Parks]

Tell you what I wouldn't want to get my fingers anywhere near these when they're going!

 

[Eagleburger]

This is good news. Took over an hour to mill 10kg tonight. Three times as long as it takes to get 71L to 55degC.

 

[Crusty]

Is there a specific purchase date range of affected Mills. I got mine from Craftbrewer a few years back & mine still seems ok. Are they all being replaced? I'm hoping mine doesn't decide to give me grief.

 

[Parks]

I expect it's simply a case-by-case basis Eagleburger. If you haven't had problems now I would think you're fine.

 

[Parks]

Holy Turk these rollers are beasts. This was 1kg of JW Pale at 0.7mm* with the motion dynamics stock worm drive motor (I haven't actually checked the speed but it seems pretty spot on)

It took 1min 10 seconds. 0.9mm wasn't even doable with the old rollers.

It seems to have actually de-husked a lot of grain but leaving both the husk and the inner grain mostly solid (cracked in 2 or 3 pieces).

Very little flour.

15 min into a pale ale in my grainfather and its recirculating perfectly. So happy right now.

*note: I set my gap by adjusting in against the feeler gauge. These rollers would have varying gaps with the depth of the flute so it wouldn't be comparable with other knurled rollers.

 

[Ducatiboy stu]

My 50mm "Tony" mill rollers do 5kg in under 1min @ ~180rpm

 

[Parks]

I should have also noted that the design of my hopper (an old 10-15L Spring water bottle) doesn't make full use of the roller length.

 

[MastersBrewery]

Be interesting to see how the new less flour crush affects efficiency.

 

[bradsbrew]

Be interesting to see how the new less flour crush affects efficiency.

Also how the grainfather handles it at sparge time.

 

[Ducatiboy stu]

Be interesting to see how the new less flour crush affects efficiency.

More flour will give more eff%....BUT.... to much and it turns into Clag Glue. And from personal experience, it is very difficult to sparge.

I found just shy of 30% to be as high as you can go without having to resort to using swear words and un lady-like language

Grain wetting is the go

 

[MastersBrewery]

More flour will give more eff%....BUT.... to much and it turns into Clag Glue. And from personal experience, it is very difficult to sparge.

I found just shy of 30% to be as high as you can go without having to resort to using swear words and un lady-like language

Grain wetting is the go

I have a normal knurled mill and would agree, however the guys with these fluted rollers are finding even at .7mm they are getting very little flour, though the grain is being completely de-husked, something a knurled roller can't do.

 

[Ducatiboy stu]

I have a normal knurled mill and would agree, however the guys with these fluted rollers are finding even at .7mm they are getting very little flour, though the grain is being completely de-husked, something a knurled roller can't do.

This is true

 

[Liam_snorkel]

I have a normal knurled mill and would agree, however the guys with these fluted rollers are finding even at .7mm they are getting very little flour, though the grain is being completely de-husked, something a knurled roller can't do.

I ran a few kg through at about .8mm this morning and that's about right. Completely dehusked, not too floury. I didn't take a photo. The main difference is that it works my drill a *lot* harder than it does at ~1mm.