Kran wrote: The grind adjustment is similar but also different from the other Eureka grinders. The hard stop seems to be a function of the top of the threaded rod running out of thread. Actually a threaded cap that is attached to the rod that the adjuster screws on to. The way to see it is to remove the top plate and then screw on the adjuster until it bottoms out. You'll be able to better see how it the mechanism works.

On my grinder if I remove the rotating burr and then re-assemble everything I have 10.25 full rotations of the adjustment knob before it locks. At this point if I rotate the bottom burr carrier using my fingers to turn the bolt it slightly binds, I assume this is the wipers touching the upper plate.

Thanks for the insight. Yes, the hard stop is indeed caused by the bottom of the rod running out of thread, and not necessarily because of the grind size adjustment mechanism reached its limit.

I've came up with putting shims on the grind dial, and I can grind finer now, though not at the chirp point.

I've a picture of my grind size adjustment knob, it's an older generation than Khan's, so it probably is shorter.

Hi all,
Great info - I was looking for 85mm Titanium / Red replacement burrs but I guess I'll have to go the 75mm route instead. Most days I'm just doing AP as I'm short on time but I also use an Elektra Microcasa Semiautomatica (1998 version) when I want more depth. It seems to be fairly forgiving on fines, etc.

I am a roaster (13 years - just closed my business) and got a great deal on the Drog. which was useful for customers wanting ground coffee. I'm hoping to get more blueberry out of my ethiopian if I switch the burrs.

Any other recommendations would be appreciated.

Just an update on my MCD4 + aligned 75mm Mythos burrs after using it for a few months and being mostly satisfied.



Alignment of 75mm Mythos burrs:
Per not being able to grind fine enough, I indeed needed two 0.25mm shims for the 75mm's burrs, after which it can easily grind past burr touch. However, it was very hard to perfectly align both top and bottom burrs in planarity and position, since there's additional degree of freedoms in the screw position of the burr's mounting and top plate. In my experience, the marker test with hand-cranked rotations didn't give a good alignment at all despite close to full marker swipe (I believe I should've run the motor to chirp). Instead, I found that using a cheap 0.1mm dial indicator gave a pretty respectable alignment and it saves a lot of time with the marker test trial and errors. It's very annoying to screw and unscrew this hunky thing 5-10 times.

Zero retention:
When you open the top plate after grinding beans, the chamber would store a lot of ground around the outer edges because of distance between the sweep arms and the edge. After using post-it-notes/name-card taped to sweep arms, it helps sweep them. This is by far the easiest and most effective mod I've done to reduce retention, even more so than RDT or air puffer alone. The only caveat is tape it securely and avoid the tape dragging too much friction.
In addition, I also drilled away the metal slit in the chute, which was very intensive but it helped avoiding build up grounds at the chute. Now, my retention averages around around +-0.1g, even after switching between pour-over and espresso setting. The first shots after cleaning the grinder would have up to 0.4g retention.

Compared to the Atom 75, I'd say the MCD4+Mythos1 wins with no taste/workflow compromises as a single-dosing grinder.
But... if there's only a way I can fix the static and chaffs build up.

Cartmarn wrote:I've done the comparison. The Mythos2 85mm burr won't fit.

Hey Leo

Do you still have the mythos 2 burr set? Also, any chance you have an 83mm Mazzer-esque burrset to compare against? If yes to both, any chance you could identify if the hole spacing is the same or not?

The eureka Zeus will have 85mm burrs. I expect those to be the same as the mythos 2 85mm, not the mcd 85mm burrs.

Assuming the former, I thought it's be interesting to know in advance if 83mm burrs may be able to be dropped in the Zeus.

Ty

JonnyTran wrote:Just an update on my MCD4 + aligned 75mm Mythos burrs after using it for a few months and being mostly satisfied.

Compared to the Atom 75, I'd say the MCD4+Mythos1 wins with no taste/workflow compromises as a single-dosing grinder.
But... if there's only a way I can fix the static and chaffs build up.

Hello John,

My name is Rhys Watkins and I own a scientific coffee company.

We have considered testing what you are doing but have been unable to justify the expences as the burr designs look to be the same except for size.

Do you believe the burr design to be the same with a different coating?

If this is true do you believe you could just use the 75mm Titanium burrs instead of "Mythos Burrs"?

Please advise as we have 5 customized MCD4 in our shops.

Thank you and I look forward to your response,
Owner
flow Scientific Coffee
Rhys Watkins

Rwatkins wrote: We have considered testing what you are doing but have been unable to justify the expences as the burr designs look to be the same except for size.

Do you believe the burr design to be the same with a different coating?

If this is true do you believe you could just use the 75mm Titanium burrs instead of "Mythos Burrs"?

Yes, I think the 75mm titanium burrs and the 75mm Mythos I burr appear to have the same size and geometry, so the MCD4 grinder can use either. However I do think the 75mm Mythos produces qualitatively better grinds (when well-aligned on the MCD4 grinder), although the differences are small.

buckersss wrote:Hey Leo

Do you still have the mythos 2 burr set? Also, any chance you have an 83mm Mazzer-esque burrset to compare against? If yes to both, any chance you could identify if the hole spacing is the same or not?

The eureka Zeus will have 85mm burrs. I expect those to be the same as the mythos 2 85mm, not the mcd 85mm burrs.

Assuming the former, I thought it's be interesting to know in advance if 83mm burrs may be able to be dropped in the Zeus.

Ty

Hi, buckersss,

Actually I've done the comparison between T151A by Mazzer and Mythos2 by putting them together. To my surprise, they have the same size. The pacing of the holes are also the same according to my naked eyes. So here is my guess：Mythos2 85mm burrs share the same fitting shape with IT/Mazzer/Fiorenzato and etc.

But this is only my guess. More real world tests is needed to confirm it.

And I'm also considering an initiative to build a crowdsourcing database of Compatible Burrs. Users could share their own individual knowledge or experience about burr replacement compatibility. We've a lot of 83mm-burr grinder on the market, but we know so little about the compatibility of the burrs.

Does it sound interesting to you guys? Let me know if you have any thoughts or ideas.