Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Electronic Lead Screw & Power Cross Feed | Poor Man''s CNC ?

Henrik,

Its a breakout in a sense with optos and comparators. The macropump within Mach monitors the activity and triggers a feedhold if an error is observed.

I'm not certain on how it does it in regard to speed but, if you'd like to see it operate at the numbers given, let me know. Jim of Sound Logic designed it. I just sell them and handle the support. Of course, like everything else he dreams up, it works great and tuff as nails.


Thanks, Ron



Henrik Olsson <henrik-olsson@...> wrote:
Ron,
Thanks for the clarification. I can't understand just HOW that works but if
you say so....
So what the interface is, basicly, is a breakoutboard that splits the
encoder signals between Mach3 and (if it's a servo system) the drive. + aux
relays. It's the macropump script that does the work.

I once did a spindle RPM sensor and interfaced that to Mach3. Then, with the
macropump I monitored the speed and shut down the machine if it was below a
certain speed for more than 5 samples. I could not get that to work beyond
~10kHz with Mach running @25kHz. That's why I'm so curious about this.....

Thanks again.
/Henrik Olsson.

----- Original Message -----
From: "R Rogers"


> Hi Henrik,
>
> Read that from a few people.... Mach is doing all the counting out and
> in as far as I know. The axis will stall at almost 160 ipm, right where
> the voltage calculation-limitation of the drive dictated that it would.
> Don't have an explanation of how it can do this in regard to speed but, it
> does it. When first started using encoder counts to monitor position, the
> concern was timing constraints. Now they aren't given much attention after
> three machines have exceeded the 22.5k mark without any issues.
>
> The Jet has those folding handcranks on it, in rapid they are a blur (700
> rpm). Thanks for the compliment on the machine.
>
> After using the interface, for close to a year now, I wouldn't want a
> machine without it. It has saved so many workpieces. Some big UHMW details
> (2X6X20) I was running on one of the Bridgeports a few weeks back. Very
> complex 3D surface and about 8 hours into the job, the X gib on the old
> Bridgeport got free of the adjusting screw and totally locked the X
> axis(fixed it). Normally Y and Z would have continued on and destroyed the
> part (80 ipm feed). The following error of .004" was exceeded and the
> interface stopped the machine. Saving the part.
>
> Ron
>
> Jon, Those are very impressive numbers. Thats a nice system you have.



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