Speidel Braumeister (brewmaster)

[pocketmon]

Interesting. I'm still learning my BM20, and I was going to start opening up my mill gap, but now I might close it more. It's crazy how different results are across users...

Crankandstein 3GT at 0.045 gets me ~65% mash efficiency with 0.9mm filter.

IMO, the accessibility of starch is one of the key factor of mash efficiency. In malt analysis sheet or specification, DBFG(fine grind) is always greater than DBCG(coarse grind). Moreover, the specification used in Europe specifies in mashing time which is usually 10 or 15 minutes, which suggests that converting finishes in 15 minutes if the malt is milled as fine as it is in the test procedure.

I set my mill gap to finest when brewing BIAB. When I got my BM20, I didn't change the gap. I am getting satisfying efficiency for recipes of less than 12lbs grains.

 

[GoeHaarden]

IMO, the accessibility of starch is one of the key factor of mash efficiency. In malt analysis sheet or specification, DBFG(fine grind) is always greater than DBCG(coarse grind). Moreover, the specification used in Europe specifies in mashing time which is usually 10 or 15 minutes, which suggests that converting finishes in 15 minutes if the malt is milled as fine as it is in the test procedure.

I set my mill gap to finest when brewing BIAB. When I got my BM20, I didn't change the gap. I am getting satisfying efficiency for recipes of less than 12lbs grains.

Yeah, I switched from doing the same. BIAB with my mill gap as small as possible getting ~80% mash efficiency. So I agree this, but I've trying to follow the recommendations from Speidel. Honesty, if I could get around 75% I'd be happy. I'm going to tighten my gap and see how it goes tomorrow.

Do you get a lot of wort fountains milling that fine?

 

[GoeHaarden]

I think the BM is sensitive to the crush but one big reason I spent so much on a mattmill is because my efficiency was terrible and I thought a new, better mill could improve that. The efficiency was fine for a few brews and since then it's plummeted.

Maybe an obvious question, but have you rechecked your mill gap? If you were getting good efficiency and not after a few brews something has changed.

I was also wondering if maybe your pump could be acting up!?

 

[Newbibrewbi]

Maybe an obvious question, but have you rechecked your mill gap? If you were getting good efficiency and not after a few brews something has changed.

I was also wondering if maybe your pump could be acting up!?

One of the reasons I bought a new mill was that I suspected the crush.
The Mattmill master should last me a lifetime, it's very sturdy and the gap intervals are pre-set.

It could be the pump but I don't know what to look for in a faulty pump. When I run it with water it seems to do its job fine.
Maybe I should get a new one, having an adjustable pump would be nice. But it's a bit hard for me to justify the money if it doesn't solve the problem...

 

[GoeHaarden]

One of the reasons I bought a new mill was that I suspected the crush.
The Mattmill master should last me a lifetime, it's very sturdy and the gap intervals are pre-set.

It could be the pump but I don't know what to look for in a faulty pump. When I run it with water it seems to do its job fine.
Maybe I should get a new one, having an adjustable pump would be nice. But it's a bit hard for me to justify the money if it doesn't solve the problem...

Gotcha. I wonder if you tightened your gap and then just add some rice hulls to help prevent fountains!?

I don't really have enough experience with the BM and I'm really just shooting in the dark here. Sorry. I just know there isn't a lot of support/data for these machines online...

 

[pocketmon]

Yeah, I switched from doing the same. BIAB with my mill gap as small as possible getting ~80% mash efficiency. So I agree this, but I've trying to follow the recommendations from Speidel. Honesty, if I could get around 75% I'd be happy. I'm going to tighten my gap and see how it goes tomorrow.

Do you get a lot of wort fountains milling that fine?

There are some but not a lot fountains. Usually, they don't survive until the end of mash. There are "pump rest" periods during mashing. It is designed to loosen the grain bed formed by pump, which alleviates fountain issues.