At the start of a cut the machine moves at a positioning rate, reading the gap
voltage, and possibly current, watching for when the signal indicates that it
is close enough to the workpiece to stop moving. This is the same algorithm
whether the electrode is 5cm away or 0.002mm away. It's all about keeping the
erosion conditions within the specified range, regardless of how far away the
workpiece is. While the voltage is > high limit, the keep moving.
Agie used to (and likely still does) support a rapid traverse mode where it
moved at X-speed without monitoring the gap conditions. They called it motion
with crash detection turned off. The only time I ever moved with crash
detection turned off was when retracting from a cavity. Otherwise every move
was in erosion mode, regardless of distance. It always works if you're not
already stuck in a cavity.
Pete
On Friday, February 26, 2016 9:29 AM, EBo <[email protected]>
wrote:
Thanks for the info. Out of curiosity, when starting a new cut, how
does the conventional EDM move onto the part? The equivalent of a G0
might be fast enough that by the time it senses that it has touched the
part, you could be moving fast enough to break the tool or wire. So, do
you do a slow G1 onto the part, and then G1 fast, or G0 through the
part? Just curious. I have never run a commercial EDM before.
On Feb 26 2016 7:38 AM, TJoseph Powderly wrote:
> nicklaus
> there is NO feedrate for edm
> period!
> the process determines the correct position
> the control system should move to the correct position as fast as
> possible
> the correct position should be close if the control system is at all
> adequate for edm
>
> there is NO feedrate for edm
>
> tomp
> 40+ years in EDM design repair and modification
>
>
> On 02/26/2016 03:34 PM, Nicklas Karlsson wrote:
>> Anybody familiar with EDM who could tell me how to adjust the feed
>> rate for EDM operations?
>>
>>
>> Nicklas Karlsson
>>
>>
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