Motorising A Hario Coffee Grinder

Link to STL files:
www.hangbar3d.com/other-projects
My wife got me a Hario Skerton Plus, but I ended up not using it because it takes me quite a while to grind coffee.
So I decided to motorise it with the help of my friend Barak.
Barak's website:
www.hangbar3d.com
Credit:
Sound Effect from Pixabay
Sound Effect by Alex_Kizenkov from Pixabay
Sound Effect by UNIVERSFIELD from Pixabay
Sound Effects Wiki

[@AlonSmil]

very nice

[@OdedArlevski]

Love it! I need one too!

[@Nightmare-Engineer]

The entire process.... such a GRIND!

[@matanpazi3777]

Touché

[@matanpazi3777]

STL files: www.hangbar3d.com/other-projects Cost details: Must have parts: DC motor - 16 USD Planetary Gearbox - 13.6 USD AC to DC 24V 10A power supply - ~27 USD 3D printing of housing + Miscellaneous - ~ 15 USD Shipping - 20 USD Total - 91.6 USD Engineering curiosity / nice to have: PCB - 40 USD 3D printed metal parts - 23 USD Total - 63 USD If we only used the "Must have", it would've cost us ~92 USD. A comparable off the shelf product, which costs €109,95 (~116 USD) is the "Electro Solo" by Hario: www.hario-europe.com/products/electro-solo-portable-electric-grinder Shipping ~ 25 USD. Still not the best financial decision :)

[@someguy9520]

Call me stupid, but i would wager that seeting the gear box ratio in such a way that the grinder makes 1rpm could help with cup quality. Lots of tests suggest that lower rpm makes less fines and more clarity. Thats especially good for filter/pourover and modern espresso There is a very expensive commandante c40 motor kit for like almost 300bucks. But the low rpm really made excellent shots

[@matanpazi3777]

No need for name calling :). I chose the speed to be as fast as possible without hurting the ground coffee's quality based on the following video: kzbin.info/www/bejne/eny0Z6mblrmgrJosi=nWw2kBimcjNmLaOc It took me around 3 minutes to manually grind a Tbsp of coffee at ~120[RPM] (2 revolutions per second), so 1[RPM] would be insanely slow.

[@someguy9520]

@matanpazi3777 Oh, in that case, it makes sense. Lance hedricks video suggested that the 1rpm mode a very clean cup compared to the 300rpm or so 3 minutes seems like a lot. How many grams is that? The 1zpresso JE-plus, for example, does 14g espress fine in like 45sec For me, personally waiting 4-5min is okay for the occasional "special" coffee with that extra care. After all, i wait a bit for the espresso machkne and portafilter to warm up. Might as well let the grinder do its best

[@dimitrikatsaros9212]

So, what was the total cost (not including the value of your and Barak's time, but including the Hario, the prototype prints, etc.)? Could you have bought a decent powered grinder for the same amount or are you still ahead?

[@matanpazi3777]

Good question. I'll pin a comment with the cost details + comparison to a comparable off the shelf product.

[@dimitrikatsaros9212]

@@matanpazi3777 Thank you! As for supplying it with power for daily use, couldn't you use an AC adapter to get the voltage you need?

[@matanpazi3777]

@@dimitrikatsaros9212 Of course. But I need a 24V 10A AC to DC power supply which is quite expensive. I'll try to get one someday, not exactly urgent :)

[@simontremblay6204]

Is there anyway your friend would share the stl files? I'm trying to do the same to my Hario. Thanks!

[@matanpazi3777]

I'll ask him about it, will update you when I have the answer.

[@matanpazi3777]

Added link in the description.