More dust collectors

Project history

  1. Previous project: Testing the Kreg K5 Master System
  2. current posting
  3. Next project: ...

After I had designed the dust collector adapter for the Kreg K5 Master System
to Kärcher and Festool 36mm hoses, I had to go on and make some more:

Kärcher/Festool to Makita PJ7000J Lamello/Biscuit Joiner router


The local FabLab had a Makita biscuit joiner that didn't fit the local Festool shop-vacs.
So I quickly adjusted the diameter and labeling.
(Hooray for parametric CAD.)

Kärcher/Festool to Bosch GKS 12V-26


The new 12V battery operated circular saw is making quite a mess.
So for it's cute, tiny dust-collection part I made an adapter too...



Testing the Kreg K5 Master System

Project history

  1. Previous project: ...
  2. current posting
  3. Next project: More dust collectors



 Pocket holes?

I plan to build some pieces of practical furniture that does not need to look pretty.
As the local FabLab is just next door, I have easy access to a Lamello milling cutter and other eqipment. Apart from dovel pins, these "biscuit joiners" seems to be the prefered joining technique in Europe.

The preference in the US seem to be pocket holes.

Now the strongest joint for particle boards is of cause to glue it. Since it is made of glued particles anyway, this maked it one solid pice.
But to glue something you need two things. alignment and pressure. 
Lamello -type Biscuit joiners provide great alignment and the limited ability to slightly correct that alignment in one axis but they need clamps for pressure.
Pocket holes provide no alightment but a lot of pressure.
So combining these two should allow me to build very strong furniture without having to use clamps and wait for effectively the next day for the glue to set because the screws in the pocket hole will clamp it down no matter where I take and put the unfinished piece.

After reading a lot about the topic, I decided against buying the cheap 30€ Wolfcraft Undercover Jig that is sold everywhere around here and get myself the big Kreg KregJig Master System in the current K5 version.
It's the big set. I just can't resist good tools. It's not the real big one that has the drill built-in.
It was a good decision because
  1. the dust-collector is a godsent,
  2. the side-extensions (with storage space and easily available screw-size table on the inside) are very useful,
  3. having the lever on the side you are on make working with it a lot of fun. (As opposed to the older K4 version with the lever on the wrong side of that large piece of wood.)
The only downside was that the vacuum cleaner attachment had a different diameter then the auto-start/stopping Festool workshop vacuum cleaners we have in the local FabLab.
...but a few minutes of CAD and <40 0.5mm="" 3d="" a="" aesthetic="" br="" did="" for="" height="" layer="" me.="" minutes="" mm="" needs="" no="" not="" nozzle="" of="" part="" printing="" qualities="" stop="" that="" time="">

Festool vacuum cleaner adaptor


Results I

Obviously the first on I build was would be crap.
So I got myself some 1€ pieces of leftover material of the same type I wanted to use but wrong thickness and  with a lot of defects and got working.
Without a plan I made some mistakes in judgement, some logical mistakes (forgot to subtract the thickness of the back wall,..) but not many mistakes in craftsmanship. Apart from working with too thin a material.
Access to proper tools made sure that the work was quick to do, quick to fix things and everything was square and how it was supposed to be.

Results I

So here I am, ready for a real piece of furniture that will actually be used. (In a place where nobody but me will ever see it.)

What I learned:
  1. Combining "Lamello" biscuit joiners and Pocket Holes is not worth the effort. Just skip the Lamello, meassure twice and double up on your clamps.
  2. You can not clamp down the K5 Master System onto a workbench.
  3. The dust collection is sow worth it.
  4. Use some kind of physical spacers for anything that needs to be clamped "in mid air" unless  you have a second pair of arms.
  5. SPAX backpanel screws are stronger then the Kreg screws and they have a standard Pozidriv crossed slot. I would have prefered Torx here to have the screw on the driver and reach to a far away hole this way.
  6. You need to clamp down everything for fastening the 4.0x25mm or 4.0x30mm SPAX backpanel-screws in the pocket holes. They tend to bend onto the side with the hole with a LOT of force.
  7. The tiny Wolfcraft "ES 22" (3051000) are much stronger then they look.
  8. The Kreg clamps open up way too wide and are a pain to work with unless you have giant hands.
  9. The Kreg clamps are very strong but you need to adjust them first.
  10. Sawing melamin coated wood is hard without damaging the surface. I'll have to do more experiments here. 
  11.  You will want a very strong screwdriver with replacable batteries even for small projects such as this. Preferable 3 batteries and 2 chargers.
  12. While I only ever see pocket holes in solid woods, they works like a charm in particle board. Just limit your screwdriver to 8-10Nm to not outsight squash the board.
  13. Update: For Melamin-coated wood, pre-drilling through the pocket-hole makes sure the screw doesn't push the 2 pieces apart when threading inside the first part but not having penetrated the coating of the second one yet.

I had the chance to try the Bosch Professional GSR 12V-15 FC screwdriver+cordless drill with replacable heads and  I think it's the perfect tool for this. 20Nm is plenty. I can't use more then 10 without destroying the wood. The excenter+90° head combines reach into the back of cabinets and to screws close to a wall. I have not switched between drill and screwdriver yet but I imagine it to be a godsent for pocket holes.

Sadly there is no Sortimo L-Boxx for the Kreg. Only some Kreg case made for Husky Boxes.
So I will have to build that myself to combine both cases into one stack.

I asked SPAX about Torx backpanel screws because the Pozidriv bit can't hold on to the screw when reaching far into cabinets.

Sehr geehrter Herr Wolschon,

vielen Dank für das nette und freundliche Feedback. Es freut uns sehr, so etwas zu hören.

Die Rückwandschrauben führen wir nur mit Pozidrive Antrieb, nicht mit Torx. Der PZ-Kraftangriff ist vor allem bei der maschinellen Verarbeitung besser geeignet.

Mit freundlichen Grüßen / with kind regards

i.A. Christoph Hessel, Dipl. Ing. (FH)
Product Manager
SPAX International GmbH & Co. KG



Bonaverde: testing Henry Hück

Project history

  1. old posting: 'roast only' on the Bonaverde - Familia Alfaro
  2. current posting
  3. next posting:

This time I tried
Bean Type:  not specified
Process "natural"
Grown by Henry Hück
of Nicaragua
Store: Bonaverde Store entry for these beans

This is one of the larger bean packs I got from a coffee delivery for my Bonaverde Berlin roast+grind+brew coffee machine.

Results I

I used: roast+grind+brew via the alpha version of the "Coffee Concierge" Facebook Messenger Chat bot.
No extra time after roasting for CO2 could be released.

I used  600ml of freshly filtered water.

filter coffee

At first I got the same, distinct sour taste along both sides of the tongue,
that I seem to get with all coffee I try. I can't get rid of it.
After a while I cleaned my mouth with filtered water. Used a fresh glass and tried again.
The sourness is only very faint and in the back of the mouth
but sadly it's the only taste I can find apart from the obvious.
Given the horrible results I had before, this however is a great success.
I will have to find out wether to attribute it to the green beans, the roasting profile belonging to these beans, the slightly cool glassware I used instead of my regular earthen coffee mugs or whatever.

PS: Obviously it still gets sour quickly when it has cooled down. Like any coffee.

Henry Hueck | Coffee Producer from Bonaverde on Vimeo.


3D models of Küpper workshop furniture

Project history

  1. Previous project: name with link
  2. old posting with link
  3. current posting
  4. next step
  5. Next project: designing a chain link tool library

I modelled some of the Küpper workshop furniture elements in Alibre Design
for the purpose of planning the layout of a workshop in 3D.
The meassurements are taken from the assembly instructions.
Some thicknesses that are not important for planning are guesswork.



'roast only' on the Bonaverde - Familia Alfaro

Project history

  1. old posting: Coffee with bottled water
  2. current posting
  3. next posting: Bonaverde: testing Henry Hück

This time I tried
Bean Type:  Rojo
Grown by Familia Alfaro
of El Salvador

This is one of the larger bean packs I got from the first coffee delivery  for my Bonaverde Berlin roast+grind+brew coffee machine.

Results I

I used "roast only" in the alpha version of the "Coffee Concierge" Facebook Messenger Chat bot a few days ago. So CO2 could be released.

I used freshly filtered water instead of having a can of filtered water in the cooler as before.
I did not use bottled water this time as it would damage the machine in the long run.
I did NOT use the roasting profile for these beans because for "roast only" I can still only use a generic default-profile.

filter coffee

I made the coffee in the Bonaverde Berlin maching using 600ml of water.
Result: definately sour. I am still at a loss why I always get this sour taste.
The temperature of the coffee doesn't change the taste.
I did NOT experience that in the Bonaverde Coffee Corner in Berlin.
Only when I try to do it myself in Freiburg with the terribly hard water here.
(That's why I use the filter.) 
Don't get me wrong, this is not like a lemon or exceptionally bad. It's just
one distinct taste that overshadows all others that may be there. 


Coffee with bottled water

Project history

  1. old posting: 'roast only' on the Bonaverde - Aldo Parducci
  2. current posting
  3. next posting: 'roast only' on the Bonaverde - Familia Alfaro


Up to now I have used tap water with a filter for my coffee experiments.
According to the water plant the water should be very hard but be only slightly above Ph neutral.
I always had the issue of always having an acidic taste.
Some coffee cups had a very balanced acidic taste, some where so strong as to be undinkable.
Especially freshly roasted coffe that was not given any time to release trapped CO2.


Now I experimented with using cheap bottled water insted.
Absolutely no sour taste anymore. Roasted the day before and even freshly roasted (with all the CO2 still in there and ALYWAYS tasting distinctly sour before) it tasted like a good cup of coffee.

Sadly it contains 500mg Ca/l+64mg Mg/l=>84,86dH and thus will just about kill the machine with scale if used often.


 Let's have a look...
The bottled water was from REWE "Aqua Mia Still" from the Alwa Spring in Sersheim.

There is a nice comparison of German bottled waters here. It has pH values (the content only lets you calculate hardness)


The water plant says, we have 23.1mg/l.
The bottled water says, we have 29.0mg/l
0mg/l is perfect
effect: in high temperature/pressure this creates hydroloric acid thatg eats away on metal.
There is nothing I can do anything about this except maybe carbon filtration.
But I don't care enough about this minor effect to do that.


The water plant says, we have 7.57pH.
The bottled water says: nothing
Water #2 says: nothing

7.0pH is perfect,
6.5-7.5pH is acceptable
effect: abovr 7.5pH this causes excess scale

Next steps: I ordered a digital pH and TPS meters from China for less then 2eur.

Hardness (Calcium only)

The water plant says, we have 75,8mg/l of Calcium
and a total hardness (considering not just the Calcium) of 12.5°dH or 2.19mmol/l
The bottled water says, we have 500mg Ca/l+64mg Mg/l=84,86dH

7°dGH/68mg/l is perfect
17-85mg/l is acceptable (first source).
8-12 °dH is acceptable (second source).
3-7 °dH is acceptable (third source).
Above 85°C this forms scale.
High hardness makes coffee go bitter quickly.
Low hardness supresses the taste of the coffee.

Here is a nice calculator between °dH, mg/l of Calcium-Oxide and ppm CaCO3,...
Or you calculate °dH = 0.1402*[Ca in mg/l ] + 0.2307*[Mg in mg/l ]
Or mmol/l= [Ca in mg/l] / 40 + [Mg in mg/l] / 24,3 .

Sodium (DE: Natrium)

The water plant says, we have 10.2mg/l.  But ADD what the water filter releases.
The bottled water says, we have 18.0mg/l

10mg/l is perfect.
Anything near that level is acceptable.

The problem may of cause also be that the water filter with my very hard water (12.5°dH or 2.19mmol/l) releases enough sodium (DE: Natrium) to exceed 10mg/l.
The original water already has 10.2mg/l and is thus at the brink of the acceptable level.
Above 50mg/l this seems to cause a sour flavor. (Very low sodium levels seem to cause sweet flavors. That sounds very interesting as it's a taste I generally like.)

TDS=total dissolved solids

The water plant says, we have 75.8mg/l of Calcium + 7.3mg/l Magnesium + 10.2mg/l Natrium+1.7mg/l potassium (DE: Kalium)
= 95mg/l  I'm not sure I did this calculation correctly and am not missing anything.
The bottled water says, we have 500+29.0+64.0+18.0+5.0=616mg/l

150mg/l is perfect
75-250mg/l is acceptable.
low=overextraction, tannic taste (DE: Gerbsäure), dry mouth
high=mineral taste, overextraction

Total alkalinity

The water plant says, we have TODO
The bottled water says: 1130mg/l of Sulfate + 414.0mg/l of Bicarbionate (DE: Hydrogencarbonat)
TODO: I need to refresh my chemistry on this topic.

40mg/l is perfect.
Anything near that level is acceptable.
effect: high=gum up outher layer of coffee and cause uneven extraction. Also scale buildup.



Setting up an OpenHab with a Homematic CCU2

Project history

  1. Previous project: name with link
  2. old posting with link
  3. current posting
  4. next step
  5. Next project: designing a chain link tool library


 I want to:
  • meassure the energy consumption of an air dehumidifier that I have running in the hobby workshop.
  • Meassure moisture, temperature and maybe even CO2 around the house.
  • Control the heating via my Google Calendar (because it shows when I'm away).

Chosen hardware:

  • Homematic parts for energy consumption and heating. 
  • I could have chosen a DIY alternative for the Homematic CCU2 but that was too much DIY for a first step that already involved way too many things I was not yet familar with.
  • Alternartive parts for energy consumption that are not completely DIY (safety) are not fully supported by EasyESP yet.
  • EasyESP on ESP8266 with various sensors and actory via MQTT at a later point.

Setting up OpenHabian

HOWEVER, do NOT edit anything in the openhab.config except maybe the Wifi password.
Else it will not boot.
(Either that or I had a broken flash the first time.)

Setting up Homematic with OpenHab

There is a very nice tutorial, that I was following.
Sadly there is one thing it is missing out on.
The CCU2 has a firewall-setting in
Einstellungen->Systemsteuerung gibt es einen Punkt “Firewall konfigurieren”,
By default is in there but if you are using e.g. 10.x.x.x, you have to enter the address of your OpenHab there.
Because it's also not mentioned in the Homematic manual, I was at the brink of throwing this out the window, shortly before I found it.

I'll probably not use Homematic in the long run and switch to Z-wave instead.

Meassuring energy consumption with OpenHab

I had another tutorial to follow here....and gave up on it.
It is written for an OLD version.
This /etc/openhab2/services/rrd4j.cfg  looks much better
Strategies {
 everyMinute : "0 * * * * ?"
   everyHour : "0 0 * * * ?"
    everyDay : "0 0 0 * * ?"

Items {
 // all items, all updates
 * : strategy = everyUpdate, everyMinute


 I did not get graphs to work until I added a
to each and every Chart in my sitemap. Then it suddenly worked.




Using RFIDler on Windows

I just borrowed an RFIDler and am trying to get it to work on Windows to read the content of some NFC cards.

Because this information was hard to pull together, here is what I found:

Firmware update on Windows

You can get mphidflash.exe from here:

You can get the latest firmware from here:
Currently it is 0203-beta (debug)

The command line simply is:
mphidflash-1.6-bin\binaries\mphidflash-1.6-win-32.exe -r -w RFIDler\RFIDler.X.production.hex

Reading cards

Positioning the cards seems to be hard.
I did not get it to work yet but it should be:

Open Putty
Open a serial connection with 115200bps 8n1 no flow control.
type enter to enter CLI mode.

should identify the type of card.

set tag  
sets the type of card

now provides information reat from the card.

source:  https://www.scip.ch/?labs.20151022


'roast only' on the Bonaverde - Aldo Parducci

Project history

  1. old posting: 'roast only' on the Bonaverde - Rodolfo Ruffatti
  2. current posting
  3. next posting: Coffee with bottled water

This time I tried
Bean Type:  Burbo
Grown by Aldo Parducci
of El Salvador

This is one of the larger bean packs I got from the first coffee delivery  for my Bonaverde Berlin roast+grind+brew coffee machine.

I used "roast only" in the alpha version of the "Coffee Concierge" Facebook Messenger Chat bot last night and ground+brew the coffee this morning.
Change to previous attempts: I used a water filter. (Water here has a PH of 7.57 but an extreme 12.2dH of hardness.)

Update: See Coffee with bottled water for later experiments with water that resulted in much better coffee.


 Again I used my Hario Skerton manual coffee grinder at the finest setting (dust).


not yet

filter coffee

Absolutelay GREAT!!!
Very balanced. Not sour at all. I can really taste distinct flavors.

Other changes 

I did add a new label "Coffee" to this blog. So you can see all postings related to it.

Also the "Coffee Concierge" Facebook Messenger Chat-Bot that controls the "Berlin" coffee machine has a new "abort machine" command. It however isn't recognized in all states and does not seem to abort a brewing cycle that has already started.



Fusion360 - you can NOT flip an axis in CAM

I just found out, that it is impossible in Fusion360 to have a single axis on your CNC be oriented differently.
All options to flip the direction of one axis in a CAM setup, also flip one of the others.

Looks like this will also never be fixed.

See: Fusion360 CAM support forum.