Medium roasts are preferred, dark oily coffees seldom sampled, either @ home or away.

The Macaps are dosed via Saunders/LPL ET-500 0.1s timers. With lighter roasts, dose weight accuracy is really quite good.

Last time I checked the MC4, for 15 shots over 5 days, the dose was 8.7 or 8.8g in 8.5s Similar performance on the MXK. Both grinders use a mini hopper and bean damper. Shot to shot pour is consistent.

A few months back, a normally Milanese roast coffee blend migrated way south of Napoli : MUCH darker and oilier. Grind time and shot consistentcy went south along with it. [One useful side effect of the bean damper is one can visually see the feed rate. Normally quite consistent with drier coffees, oilier ones feed somewhat jerkily.]

I purchased a Sulawesi Toraja SO, roasted darker still. Grind times and shot consistency for the same measured weight are abysmal.

Reasoning inconsistent feed equals inconsistent grind with portions ground ala single dose and portions loaded hopper, I adjusted the MXK grind for single dose. Voila, consistency returned.


Point to ponder : Is Titan consistency due to larger throats and steadier burr feed?

Point to ponder : Is Titan consistency due to larger throats and steadier burr feed?

That could be the case. A large blade would cut a bigger chunk at once, meanwhile a smaller one would need several passes (more fines?) for the same result. The throat could act as a restriction that prevents an even feed. Maybe some grinders perform better with small beans.

some extra factors to consider:

Humidity plays a big role, 5% being ideal (time of the year is important)
Some SO beans are bigger than others
Blends may have different bean sizes/densities which could potentially contribute to unevenness
time after roast affects crunchiness (more fines more body)
bean density and weight

Beans should be part of the equation as well as the burrs

Cheers

Single dosing at home began because home roasters mostly switch blends with every shot. We either single dose or buy three to five grinders.

Hmmm... never did that... too much cross pollination... although I did single dose consecutive shots of the same coffee for a while... too much of a PITA compared to timed dosing... dif'rent strokes

Single dosing at home began well before home roasting became popular. (Plus, I would guess that a reasonable fraction of home roasters do already have 3-5 grinders.)

Welcome, David. It isn't Usenet, but it thankfully isn't alt.coffee.

Hallelujah!, I'm no longer the most senior altie, and no longer bound to trot out semi-relevant reminisces.

I've lurked here occasionally over the years, mainly when Roger B. directed me to a thread, but never got around to posting. I guess I was always hopeful that a.c would rise again from its toxic ashes.