Re: [CAD_CAM_EDM_DRO] Re: micro wire-edm project (and software solution)

----- Original Message -----
From: "turbulatordude" <dave_mucha@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, October 28, 2005 9:39 AM
Subject: [CAD_CAM_EDM_DRO] Re: micro wire-edm project (and software
solution)


> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "JCullins"
> <james_cullins@s...> wrote:
>>
>> What voltage and currents do most use for EDM ?
>> Constant current is not hard to produce.
>> Do you maintain given distance away from the material to be cut ?
>>
>> I guess I need to get a book on the subject.
>> Jim
>
> There are two beginners books.
>
> Langolis has been around for a few years and is pretty good. He
> rambles a lot and much of the book is haphazzard writing. It was very
> hard to follow some of the ideas as it appeared he knew what he was
> talking about so he didn't have to write it down.
>
> But, if you can piece together the ideas he puts out, it does cover
> the topic very well.
>
> He did go into theory pretty well, and for some people, that is a nice
> part. for others, it just confuses the matter.
>
> The other book, Build and EDM by Ben Flemming is written in a
> different manner. Ben wrote it almost as an instruction manual for a
> plans set. Very straighforward in a more step by step approach.
>
> I think he missed some of the details, but they are very easily filled
> in my the average person.
>
> There are two yahoo groups for EDM that I am aware of.
>
> http://finance.groups.yahoo.com/group/EDM_CNC/
>
> http://groups.yahoo.com/group/EDMHomeBuilders/
>
> The second is Ben's list where he will answer questions about his book
> and building and such.
>
> In the first, there is a decent links and files section, so both are
> worth visiting.
>
> Hope that helps.
>
> Dave
>
>
>
>
>
>> ----- Original Message -----
>> From: "Graham Stabler" <eexgs@n...>
>> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
>> Sent: Friday, October 28, 2005 4:05 AM
>> Subject: [CAD_CAM_EDM_DRO] Re: micro wire-edm project (and software
>> solution)
>>
>>
>> >
>> >> A current sense resistor has to be able to handle the total current.
>> >> diodes are cheap in comparison. They have a high voltage drop which
>> >> is not always a good thing, but can make monitoring the current easy.
>> >> But, did I mention they are cheap ?
>> >>
>> >
>> > I am still a little confused as the voltage drop over a diode will be
>> > its forward voltage and that is not normally very large. The voltage
>> > drop will not be proportional to current and as you would still need
>> > to limit the current you could use the current limiting resister.
>> >
>> >> Many of the low end RC EDM machines use them as the sense voltage
>> > source.
>> >
>> > So they are not using them as a voltage references?
>> >
>> > I will probably measure gap voltage anyway to be quite honest and if I
>> > were to use a shunt it could be a tiny value, at the low intended
>> > currents it would not need to be all that big or expensive.
>> >
>> > Graham
>> >
>> >
>> >
>> >
>> >
>> > Addresses:
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> Addresses:
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> [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it
> if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
> sister site to the CCED group, as many of the same members are there, for
> OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
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