Yoonseo Log: Difference between revisions

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=October 2012=
'''Left OSE on February 2013 in the aftermath of Nov 2012 conflict arising from zero sharing of CEB Press production profits, and also due in part by certain behaviour and comments by Marcin. Now starting an open hardware business - Open Tech Forever.''' [[User:YK|YK]] ([[User talk:YK|talk]]) 18:53, 19 February 2013 (CET)


==14/10/2012==
=Past=
 
[http://www.youtube.com/watch?v=qadXgdzUZWc Heidendan Vertical Machining Center]
 
[http://www.youtube.com/watch?v=Z9RIYUwQ7Sk Feeler Taiwan Vertical Machining Center]
 
==13/10/2012==
 
Recoveredering from minor sickness
 
Troubleshooting internet slowdowns - [https://en.wikibooks.org/wiki/Tomato_Firmware/Menu_Reference#Conntrack_.2F_Netfilter Tomato Wikibook] - Success!
 
Winterizing, organizing, cleaning Hablab with others. Great results.
 
TIG welder argon flowing! Solution was to use hose clamps on the regulator barb and machine barb.
 
Huge C Clamp order.
 
==12/10/2012==
 
Successfully troubleshooted hablab internet system
 
Oscilloscope on Arduino with Direct Digital Synthesis
 
Acquired tungsten rods and foods
 
Prototyped and documented [[Light Screen]]
 
Continued setting up TIG welder - argon not flowing?! - ah read the manual [[File: TIGTorchmanual.pdf]] and should try adjusting the knob of the regulator with a wrench.
 
[http://www.youtube.com/watch?v=pkeeBRpoJCc Advanced TIG Welding Setup]
 
Ordered 3/4"MPT to 3/4"FPT Lead-Free Brass Elbow
 
Ordered Geiger Counter after thoriated tungsten spook
 
==Thu Oct 11, 2012==
 
[[Inverter]] Development - Extent of Arduino's Functions
 
Successful materials for [[Light Screen]] from Sweiger Shop with Gabi
 
Setting up TIG welder
 
[http://www.youtube.com/watch?v=pg-kLHfXvLg How to Set Up a TIG Welder]
 
[http://www.youtube.com/watch?v=tAJUszNNudc&feature=relmfu How to TIG Weld]
 
Pure tungsten is appropriate for AC TIG welding (ex. 99.5%+ tungsten)
 
[http://www.millerwelds.com/resources/articles/tungsten-electrode-guide TIG Welding: Tungsten Electrode Guide]
 
==10/10/2012==
 
[[Inverter]] Development - Further topology development at [[Inverter Log]] and learnings from [https://en.wikipedia.org/wiki/Buck-boost_converter Buck Boost Converter at Wikipedia]
 
Discussion with Alexander Kiselev
 
[[CNC Circuit Mill]] Electronics Sourcing Research - Stepper Motors
 
[http://machinedesign.com/article/dynamics-of-hybrid-stepper-motors-0217 Dynamics of Hybrid Stepper Motors]
 
Winterizing items
 
==9/10/2012==
 
Organized [[Inverter]] development documentation
 
Produced and documented [[Terminal Block]] x2
 
[http://www.youtube.com/watch?v=1fiJupfbSpg Journey Inside the Cell: Information to Proteins]
 
[http://www.youtube.com/watch?v=i8c5JcnFaJ0&feature=related How Cells Obtain Energy]
 
[[Perspective]]
 
==8/10/2012==
 
Ordered more power strips and a light for the hablab
 
[http://askubuntu.com/questions/132640/dell-d630-with-ubuntu-12-04-fail-to-shut-down Fix for Ubuntu 12.04 Stuck at Shutdown]
 
Successful food acquisition trip with Gabi, Graham, and David
 
Successfully uploaded [[GRBL]] to Arduino Uno R3 using Ubuntu 12.04 - followed documentation from before, adding ruby and avrdude installation steps
 
Successful troubleshooting of [[Powercube]] V6 with Graham - faulty relay, temporary fix with connector-to-connector switching solution
 
Successfully started coordination of [[Inverter]] development, with the [[Inverter Log]] with Aaron
 
==7/10/2012==
 
Preparation for winterizing and organizing personals.
 
Civ5 and starcraft LAN party. Great mental exercise- lots of information processing.
 
==6/10/2012==
 
Mainly group construction work- sealing up gaps to winterize the hablab and organizing the backroom for better tool accessibility
 
Ordered various electronics parts for [[CNC Circuit Mill]] V2
 
==5/10/2012==
 
Specifying and hyperlinking mechanical/electronics/software for [http://opensourceecology.org/wiki/CNC_Circuit_Mill#Electronics CNC Circuit Mill V2]
 
Minor revisions to documentation presentation for the electronics projects in [[Open Source Technologies]]
 
Research into motor selection for spindle designs at [http://opensourceecology.org/wiki/Electronics_Info Electronics Design Info]
 
==4/10/2012==
 
The way to prevent premature latching on the CEB Press is to keep the hall effect sensors mounted parallel to the magnets' moving plane. This resolved all premature latching issues. CEB Press 4.0 fully operational. Optimized CEB Press Testing and Operation Code: [http://opensourceecology.org/wiki/File:CEBOperationTest.ino CEB Test and Operation Code]
 
Restocked food inventory.
 
Performed first aid and health operations on hurt/sick members of on-site team. Arrythmia and pre-hypertension concerns.
 
Improved documentation for the [[CEB Press]]
 
Ordered more aluminum flat bar, mainly for [[Terminal Block]] production
 
==3/10/2012==
 
Installed [[Hall Effect Sensor Module]] x2 on [[CEB Press]] V4.0 with bent pieces of aluminum flat bar and small C-Clamps.
 
Resolved a broken inverter issue with Marcin by connecting the workshop grid to one of the remaining inverters. Reliability is definitely a significant design principle.
 
Discussed short-term implementation of forums/stack overflow-like software to help development process. 2 major factors for the success of such software identified as access and action relevance. Access made easier with invites, action relevance made easier by the right questions to prompt the right answers.
 
Tested the CEB Press with manual control. Teamed up with Marcin to fix some issues. Troubleshooted total non-movement by increasing up the hydraulic pressure from the powercube. Troubleshooted primary cylinder non-movement by loosening front support plate, but discovered that the real problem was a loose quick connector connection from the primary solenoid valve. Full manual control success. Back to solo work.
 
Tested the CEB Press with test code. Troubleshooted weird sensor-triggered movement by examining sensor analog values. So! The hall effect sensors switch and latch on and off, but electrical noise and in-circuit imperfections cause fluctuating output signals. To add to the problem, the magnetic field of the magnets interact with the sensitivity of the sensors as to cause multiple latching events when the sensor passes a single magnet!
 
How to make the sensors work properly?
 
1. Take multiple sample readings and average them into a moderated value; this will diminish the effect of short-lived extreme fluctated signals. Increasing the number of samples per averaged reading and decreasing the delay time after each sample helps, but will be limited by the processing speed of the electronics.
 
2. Use separate upper and lower trigger values for the microcontroller to determine when the sensor has passed a magnet. This ensures that fluctuations that pass a trigger value can be safely ignored to an extent by the microcontroller. 2 values that help determine the upper and lower trigger values are: minimum value in the high-latched sensor state and maximum value in the low-latched sensor state. If possible, have the lower triggger lower than the aforementioned minimum value and the higher trigger higher than the aforementioned maximum value.
 
3. Use post-latch delays. That can be as simple as putting a fixed delay after each latch-switch. This helps minimize the effect of sensor sensitivity to strong irregular magnetic fields but limits the operating speed of the sensor-controlled movement (ex. if the delay is 1 second, then the magnets need to be at least 1 second apart for the microcontroller to have enough time to pick up on the next latch point as it passes the second magnet). CORRECTION: Forget this, the sensor still latches and it's just the microcontroller that doesn't respond until after the delay. No good. We don't want the sensor to prematurely latch in the first place.
 
Made significant revisions to the testing code for extreme troubleshooting ease. [http://opensourceecology.org/wiki/File:CEBOperationTest.ino CEB Press Test Code]
 
Tested the new test code to success after implementing all of the make-sensors-work-properly changes. Started to revise the operation code for continuous brick pressing.
 
Contacted Star Simpson about inverter design topologies.
 
[http://www.youtube.com/watch?v=D1eOQa1gYiU Scraping in a Dovetail - Detailed]
 
[[File: hardenedboxwayslides.pdf]]
 
[[File: dovetailslides.pdf]]
 
[[File: linearwayslides.pdf]]


[[File: cartridgeblockspindles.pdf]]
[http://opensourceecology.org/wiki/Yoonseo_Log_1_2013 Yoonseo Log 1/2013]


==2/10/2012==
[http://opensourceecology.org/wiki/Yoonseo_Log_12_2012 Yoonseo Log 12/2012]


Using arduino IDE 64-bit on ubuntu 12.04 - [http://blog.markloiseau.com/2012/05/install-arduino-ubuntu/ Guide to Arduino] make sure you open arduino as power user with '''sudo ./arduino''' when in the correct folder! Otherwise the serial port will be greyed out.
[http://opensourceecology.org/wiki/Yoonseo_Log_11_2012 Yoonseo Log 11/2012]


[http://opensourceecology.org/wiki/Hall_Effect_Sensor_Module Hall Effect Sensor Module V2] x2 complete
[http://opensourceecology.org/wiki/Yoonseo_Log_10_2012 Yoonseo Log 10/2012]
 
*Research for choosing between rod, dovetail, or boxed way for linear guide (whoa there's V-ways and half-round ways too!) Gah I need a free download of the book "Foundations of Mechanical Accuracy"
 
'''Dovetail'''
 
You are not under the impression that the dovetail cutter needs to be the full width of the female dovetail are you?The cutter only needs to be as tall as the dovetail.Your remark about not having large dovetail cutters prompts my question.
 
Dovetails only need 1 gib
 
Actually the dovetail is the simpler mechanism. It is simpler to make and simpler to adjust in use. The one gib at 45 or 60 degrees takes up slack both sideways and vertically. One adjustment and you are done.
 
I was afraid of the results before I made my first dovetail, but it is a piece of cake if you plan it properly. The setup is the same for both male and female parts. As mentioned above, you do not use a cutter that is the full width of the female dovetail. You use a standard milling cutter to rough out the center, usually to a depth slightly greater than the actual dovetail. then you cut each side individually. The cutter only needs to be tall enough to cut the whole angle at one time.
 
I used a CAD drawing and placed even sized circles tangent to both the angled sides and the flat top/bottom surfaces to give me a way of measuring the width of the dovetail. You can read the distance between them off the drawing to three or four places and them use drills or ground, round stock of the same size to measure your work. Just mike between them on the female dovetail and across them on the male. Real quick way of checking your work on the mill. Of course, with a gib, you don't need extreme accuracy.
 
'''Box'''
 
Boxed way more rigid than dovetail
 
Boxed way conventionally steel with turcite for anti-friction contact surface OR cast iron with oiling OR metal with high-pressure oil (hydrostatic)
 
Boxed way conventionally ground then scraped
 
=Future=
 
Terminal Block Production Run x10+
 
CNC Circuit Mill V2
 
CNC Multimachine
 
Universal Power Supply
 
Encoder Test
 
Mini Clamp
 
Battery Holder
 
Visual Display Module
 
=Past=


[http://opensourceecology.org/wiki/Yoonseo_Log/Archives <2/2012]
[http://opensourceecology.org/wiki/Yoonseo_Log/Archives Yoonseo Log <2/2012]


[[Category:Logs]]
[[Category:Personal Logs]]

Latest revision as of 17:53, 19 February 2013

Left OSE on February 2013 in the aftermath of Nov 2012 conflict arising from zero sharing of CEB Press production profits, and also due in part by certain behaviour and comments by Marcin. Now starting an open hardware business - Open Tech Forever. YK (talk) 18:53, 19 February 2013 (CET)

Past

Yoonseo Log 1/2013

Yoonseo Log 12/2012

Yoonseo Log 11/2012

Yoonseo Log 10/2012

Yoonseo Log <2/2012

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