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The fabulous fifteen cent Hario Skerton stepless mod
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fwtechwiz
Senior Member


Joined: 19 Feb 2010
Posts: 530
Location: Fort Wayne, IN
Expertise: I live coffee

Espresso: Gaggia Evolution
Grinder: Hario Skerton
Posted Fri Oct 8, 2010, 3:54am
Subject: The fabulous fifteen cent Hario Skerton stepless mod
 

I finally got frustrated enough with my Skerton to do something about it not being stepless.  I picked up an 8MM Nylok nut from the hardware store for about 15 cents and replaced the adjustment cog with it.  The nylok works great to keep it from moving while grinding, and now I can adjust the grind coarseness easily with an open end wrench.  Highly technical terms here....I can move the adjustment a bit (one sixth turn), a tad (one 12th turn) or a scoach (1/24th turn)  hehe
BTW, you still have to install the forked washer, or the handle won't tighten down right, but it still fits nicely around the nut.
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IMAWriter
Senior Member
IMAWriter
Joined: 4 Jul 2002
Posts: 5,841
Location: Brentwood, TN
Expertise: I live coffee

Espresso: Bezzera Strega
Grinder: Forte, OE Pharos,...
Vac Pot: Adcraft SS, Yama 8 cup
Drip: Brazen, Kalita, Chemex,...
Roaster: Behmor 1600, CO/UFO combo
Posted Fri Oct 8, 2010, 9:52pm
Subject: Re: The fabulous fifteen cent Hario Skerton stepless mod
 

Good work! Truly worthy of a Geek!
Perhaps your solution might work on some of the other cylindrical style grinders that are stepped.
Let us know if the results remain consistent grind to grind. Those little guys can be tricky.

 
Rob J (LMWDP #187)
My Music Production web site:
www.robertjason.com
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fwtechwiz
Senior Member


Joined: 19 Feb 2010
Posts: 530
Location: Fort Wayne, IN
Expertise: I live coffee

Espresso: Gaggia Evolution
Grinder: Hario Skerton
Posted Mon Oct 11, 2010, 6:02pm
Subject: Re: The fabulous useless fifteen cent Hario Skerton stepless mod
 

Well, the stepless mod has proven to be stable, has not moved yet.  So after extending the burr mount with a nylon bushing to stabilize the moving burr shaft, and replacing the stepped adjustment with the lock nut, I have A COMPLETELY USELESS HAND GRINDER FOR ESPRESSO !!!  The shaft that the moving burr mounts on has worn to the point that the burr shifts from side to side by about 1/10 of an inch, no matter how tight I make the bottom nut which holds the burr onto the shaft.  Another serious design flaw with this grinder.  Here is a link to a YouTube video which illustrates this flaw.  
click here
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AndyPanda
Senior Member
AndyPanda
Joined: 12 Jul 2010
Posts: 769
Location: San Francisco Bay Area
Expertise: I love coffee

Espresso: Olympia Cremina, Various...
Grinder: Mazzer Major, Fiorenzato,...
Vac Pot: vintage Corey
Drip: AeroPress
Roaster: BreadMachine/HeatGun
Posted Mon Oct 11, 2010, 11:59pm
Subject: Re: The fabulous useless fifteen cent Hario Skerton stepless mod
 

J.B. Weld?
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fwtechwiz
Senior Member


Joined: 19 Feb 2010
Posts: 530
Location: Fort Wayne, IN
Expertise: I live coffee

Espresso: Gaggia Evolution
Grinder: Hario Skerton
Posted Sat Oct 16, 2010, 1:49am
Subject: Re: The fabulous useless fifteen cent Hario Skerton stepless mod
 

AndyPanda Said:

J.B. Weld?

Posted October 11, 2010 link

I've analyzed the wear on both the threaded rod and the burr itself, and it seems there is no wear on the threaded rod.  I measured the threaded rod all along the length where the burr mounts, even at the end, where the nut screws on, and the thickness is the same.  The inside measurement of the hole in the burr, however, is quite a bit different at the top vs. the bottom.  Clearance between the shaft and hole at the top is about .004, but clearance at the bottom (the end where the nut makes contact) is .011.  This means that either the burr was manufactured with the hole in a 'conical' shape, or has worn significantly at the lower end of the hole.  I've applied a small amount of silicone caulk on the shaft, taking care not to extend the silicone beyond where the threaded rod comes out of the bottom, in an attempt to create a silicone 'bushing' between the rod and the burr.  After it sets up, I'll see if stability of the burr on the shaft has been restored.
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fwtechwiz
Senior Member


Joined: 19 Feb 2010
Posts: 530
Location: Fort Wayne, IN
Expertise: I live coffee

Espresso: Gaggia Evolution
Grinder: Hario Skerton
Posted Sat Oct 16, 2010, 5:55pm
Subject: Re: The fabulous useless fifteen cent Hario Skerton stepless mod
 

Update on the Skerton mods:  The silicone has stabilized the rotating burr, it no longer has any play from side to side.  An addition of a couple of small 8mm washers and a spring between the burr and the nylon shaft stabilizer has eliminated any chance of vertical movement of the rotating burr while grinding.  So now the rotating burr is completely stable both horizontally and vertically.  So far, this has resulted in visibly more uniform grind size and nearly eliminated the annoying 'stop and go' while grinding.  I'll now work on dialing in the right grind size again for my espresso, and when I get it to the requisite 25 second 2 oz pull, I'll try the bottomless p/f again and see if the channeling problems I had have been fixed.
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fwtechwiz
Senior Member


Joined: 19 Feb 2010
Posts: 530
Location: Fort Wayne, IN
Expertise: I live coffee

Espresso: Gaggia Evolution
Grinder: Hario Skerton
Posted Sun Oct 17, 2010, 12:04pm
Subject: Re: The fabulous  fifteen cent Hario Skerton stepless mod
 

Picture of the spring addition to the burr shaft.  The nylon spacer still gave a bit of side to side slop, so I added the screw insulator to further reduce the I.D. of the bushing so it's a nice tight fit now.

fwtechwiz: DSC00401sm.jpg
(Click for larger image)
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fwtechwiz
Senior Member


Joined: 19 Feb 2010
Posts: 530
Location: Fort Wayne, IN
Expertise: I live coffee

Espresso: Gaggia Evolution
Grinder: Hario Skerton
Posted Sun Oct 17, 2010, 12:13pm
Subject: Re: The fabulous  fifteen cent Hario Skerton stepless mod
 

Skerton fully assembled with horizontal stabilizer bushings, washers, veritcal stabilizer spring and stepless adjustment.

fwtechwiz: DSC00404sm.jpg
(Click for larger image)
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fwtechwiz
Senior Member


Joined: 19 Feb 2010
Posts: 530
Location: Fort Wayne, IN
Expertise: I live coffee

Espresso: Gaggia Evolution
Grinder: Hario Skerton
Posted Sun Oct 17, 2010, 12:15pm
Subject: Re: The fabulous  fifteen cent Hario Skerton stepless mod
 

Picture of stepless adjustment.

fwtechwiz: DSC00405.JPG
(Click for larger image)
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EricBNC
Senior Member
EricBNC
Joined: 22 Jun 2010
Posts: 1,866
Location: North Carolina
Expertise: Just starting

Espresso: QM Silvano, LP Stradivarius,...
Grinder: K30, Major, Preciso, Pharos,...
Vac Pot: Sunbeam C30, Bodum Santos...
Drip: Bonavita BV-1800,...
Roaster: Behmor, Melitta, Fresh...
Posted Sun Oct 17, 2010, 1:21pm
Subject: Re: The fabulous  fifteen cent Hario Skerton stepless mod
 

very cool.

You inspired me to try adding a spring.  I took the wire backing from a spiral note book and 2 washers and placed this on the burr shaft between the burr and the bottom of the plastic middle bushing that is attached to the upper bean chamber.  It felt smoother while turning (no "impact" beans) even when resistance slightly increased from time to time as it normally will.  The Grind is fine but not powder and looks more even than I can recall using this coarser setting.  

Thank you.

 
I chew coffee beans with my teeth while gargling with 195 F water to enjoy coffee. What is this "coffee brewing" device you speak of?
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