Re: [CAD_CAM_EDM_DRO] encorer feedback

Jon Elson <elson@...> wrote:

Ron Kline wrote:

>Hi
>I asked this same question some time back on the (mach1mach2CNC) list
>and Art answered that Mach2 is already designed to talk to the encoder
>as long as it is a 5 Volt all you have to do is feed it 5 Volts and tie
>the out put to 2 pins on the parallel port and go into the mach2 setup
>and let it know what pins you are using .
>There are some instructions in the manual also that will help .
>
>

But, Mach2 doesn't actually USE the encoder information, except to
display it on the screen. If a motor stalls and it is a whole inch out of
position, it pays no attention, just displays where the machine actually
is, while blindly continuing to ruin the workpiece. What's the purpose
of encoder feedback, if not to keep track of machine position?

Jon

Ok. I'm confused here. I understood that Geckos after a 128 pulse/count dicrepancy between encoder and drive will fault. At 800 counts per revolution and 2.5 :1 reduction on the drive would only allow about .020" positioning error before faulting. If I understand this correctly. Incidently, I've used a Mach2/Gecko setup on a Bridgeport and have not lost a step/ruined a part due to lost position nor ever lost position in a year and a half under normal operation. To term it a "Hobby" or not a "Real" control software is a bit unfair. It reliably does what it is supposed to do. Without the "Real" software price and they do nothing more than hold position like Mach2. A software that monitiors axis position via encoder feedback is only required when the axis actuator is inadequate for the task at hand i.e. insufficient torque etc. Who wants that anyway?

Ron







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