Re: [Emc-users] Coffecup EDM

hi nicklas some dielectric info http://www.guiacnc.com.br/maquinas-em-geral/eletroerosao-caseira/?action=dlattach;attach=30033 basically the gap distance is goverened by the fluids 'dielectric breakdown strength' a measure of the distance at which a given voltage will allow a 'spark' to jump

Re: [Emc-users] Coffecup EDM

No flushing yet. I guess oil do not have suitable boiling tempereture to run thru coffe machine with filter so I guess it's time to move to real machine. 2016-07-04 9:00 GMT+02:00 Roland Jollivet : > What hasn't been mentioned yet is flushing, which I don't think

[Emc-users] Coffecup EDM

What hasn't been mentioned yet is flushing, which I don't think you're doing in your cup. If you read up on EDM sites, the motto is that EDM is all about flushing, flushing, flushing. Catering to parameters of dirty fluid is lot harder than using a decent liquid flow over the part. And EDM is

Re: [Emc-users] Coffecup EDM

There have been a few days more, I have nailed some problems in my circuit and added parameters to EDM protocol generator. > ... > the important bit is the voltage level of the 'seat' > IF you tune your circuit to track (servo) near this value > THEN the process will stabilize There is a very

Re: [Emc-users] Coffecup EDM

Well it seems to work I got something like a frying sound and machining half of the time with shors and opens. > Nicklas > regarding 'start of period to count' > there is a concept in EDM that was branded ISOpuls and more genericly > iso-energetic > > it is a method concerning WHEN to begin

Re: [Emc-users] Coffecup EDM

I have EDM function without doubt. There is however a difference if on time is started to count at 28 volt or lower there are sparcs but if it start at around 35.0 volt there are not much sparcs. Main current source is turned on during ignition and I suspect there are current flowing before on

[Emc-users] Coffecup EDM

Put a 1uF cap across your spark gap. This will allow you to test whether you have EDM function at all. Even a 10uF cap. It will mess with your control, but you can now get a handle on your fluid, and typical gap. Regards Roland On 25 June 2016 at 10:37, Nicklas Karlsson

Re: [Emc-users] Coffecup EDM

Nicklas regarding 'start of period to count' there is a concept in EDM that was branded ISOpuls and more genericly iso-energetic it is a method concerning WHEN to begin the on-time count. to make each spark have same energy the duration of current flow must be equal so a circuit to detect the

Re: [Emc-users] Coffecup EDM

I investigated further and it seems to matter at which voltage level start of period start to count. As is now current is on during wait for ignition and hence this period may be elongenated with a lover voltage level. Low enough and on time will not start until a sparc happen. I actually

Re: [Emc-users] Coffecup EDM

I've not played with EDM for quite a while. > 10 years so I've forgotten most of what I knew. I know of people that used hardware store lantern oil as EDM fluid. If it sounds like frying bacon you are in the right range. Sounds (npi) like fun. :-) Dave On 06/19/2016 10:07 AM, Nicklas

Re: [Emc-users] Coffecup EDM

Micro controller sample voltage in the middle of the on period and then I adjusted parameters to value in the middle of the period process got quite, see attached picture. Voltage is also regulated to this voltage rather well. There are no sparks so I guess fluid have some resistance. Maybe

Re: [Emc-users] Coffecup EDM

Forgot to mention. The micro controller have two 12 ADCs able to sample with a frequency above 1MHz synchronized to the timers. It is a really great device for just a few dollars if boutght one by one. On Tue, 21 Jun 2016 08:39:28 +0700 TJoseph Powderly wrote: > Nicklas

Re: [Emc-users] Coffecup EDM

Well as is now on & off signal is hardcoded into EDM board and is not available at a higher level. I think frequency is around 16kHz which is 16 times faster than servo period. Voltage sampling is done in the middle of the on period. I will fix the small details, maybe within a week or so. As

Re: [Emc-users] Coffecup EDM

Nicklas hello' could you do another screenshot, but add the oscillator ( on & off command signal )? it would be easier to interpret thanks tomp tjtr33 On 06/20/16 00:07, Nicklas Karlsson wrote: >> On 06/19/16 17:55, Nicklas Karlsson wrote: >>> I tried to tune parameters manually but most of the

Re: [Emc-users] Coffecup EDM

> On 06/19/16 17:55, Nicklas Karlsson wrote: > > I tried to tune parameters manually but most of the time is spent either in > > short circuit or open circuit, > this is called 'hammering' > it actually works but for a poor reason. > if the tools is too far away, you are open > if the tool is too

Re: [Emc-users] Coffecup EDM

Nicklas hello some notes in line... On 06/19/16 17:55, Nicklas Karlsson wrote: > I tried to tune parameters manually but most of the time is spent either in > short circuit or open circuit, this is called 'hammering' it actually works but for a poor reason. if the tools is too far away, you are

Re: [Emc-users] Coffecup EDM

Send that to Hackaday.com From: Nicklas Karlsson <nicklas.karlsso...@gmail.com> To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> Sent: Saturday, June 18, 2016 3:08 PM Subject: [Emc-users] Coffecup EDM I have real machine but coffecup is more

Re: [Emc-users] Coffecup EDM

Then action is normal and not because of bad control loop parameters. Sparc extinguishing seems to work really well but what bother me is current is very low although I got no experience of what to expect. I never run a "real" machine. Regards Nicklas Karlsson On Sun, 19 Jun 2016 07:19:59

Re: [Emc-users] Coffecup EDM

hahaha thats great Nicklas. the action at the gear tells me its real edm too! thanks tomp On 06/19/16 04:08, Nicklas Karlsson wrote: > I have real machine but coffecup is more handy during development and at last > I got my coffecup EDM up and running. > > https://youtu.be/fBOl_pCkDFA > > >

[Emc-users] Coffecup EDM

I have real machine but coffecup is more handy during development and at last I got my coffecup EDM up and running. https://youtu.be/fBOl_pCkDFA Nicklas Karlsson -- What NetFlow Analyzer can do for you? Monitors