Re: EDM home brew units ?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "agerooo12000"
<agerooo12000@y...> wrote:

>
> > > Forced displacment is normally what they use in commercial
> machines I
> > > think as you are trying to force fluid through tiny gaps. I have
> no
> > > ideas about motorbike pumps :)
> > >
>
> > My concern is the wear on the pump.
> >
> > I don't know fluid, but in moving air, there are different types of
> > fans. some for moving huge ammounts, but cannot generate any
> > pressure. others that can create huge pressure but no volume, and
> > lots inbetween.
> >
> > A suction would place the filter before the pump, so that may offer
> > some protection.
> >
> > Also, automotive oil filters are spring loaded so they will allow
> > bypass when filled. This may or may not be a problem.
> >
> > Dave
> >
>
>
> The KZ650 pump is a gerotor pump. Positive displacement flow control
> can be by both a motor control to the DC motor that will drive it and
> a blow off valve if an over pressure occurs. I'm not too worried
> about wear. I have two of them and they were free. I'm a packrat
> don't ya know. I have worked with an industrial size EDM and know
> that the pumps deliver a fair amount of pressure in order to force
> swarfe up the tiny gap between the electrode and work. Too much
> pressure can have an adverse affect on the electrode if it is a thin
> tube by forcing the tube to the side and causing a short.
>
> It is all a balancing act.
>
> It seems to me that if you were swiching power to the electrode, you
> still need a cap in the system, or you would need a robust power
> supply in order to drive the spark. Langlois' system had MOSFETs for
> both charging the (small) cap(s) and more MOSFETs for discharging
> them. (the duty cycle of charge/discharge) This system gives a nice
> finish and speed (If you can think of an EDM as being speedy... )
>
>
> Bill
>
> This all started when I broke a tap and refused to toss the $20 of
> aluminum away. Now I'm thinking of machining personalized forms into
> punches for the custom bike market. Builders can punch their mark in
> undisclosed areas in order to prove ownership in case of theft.
>

That will disappear when RFID is more widley available. it is a way
to drive aournd and find the bike parts instead of having to check
each one. not sure of the range, but is would save an agrument if a
drink saw you looking too closly.

Dave