Quote: Message: 6 Date: Tue, 22 Nov 2016 22:16:12 -0500 From: Dave Cole <[email protected]> Subject: Re: [Emc-users] Wiring up a 7i77 To: [email protected] Message-ID: <[email protected]> Content-Type: text/plain; charset=windows-1252; format=flowed
> The front panel terminal block sources 12VDC for switch closures, but the > inputs are 24V tolerant for external wiring. Are you sure about that? Unless they changed the specs and I didn't realize it, the Teco Servo drives are not. Dave ------------------------------ /Quote: OK Dave - You kicked in my Paranoia. Confirmed: Page 16 in the original provided manual, and page 18 in the downloadable PDF manual. Wiring diagram for external 24VDC of TM2 input terminal block. But this is a TECO FM50-203 VFD, not a servo drive. I been digging through Hurco wiring diagrams, Mesa manuals, the Whole LCNC 2.8pre documentation pdf so I was suddenly worried the wires might have gotten crossed in my gray matter. Thankfully there it was in bold large type, proof I have not gone senile yet. Thanks Dave - I'd rather get false alarms, then sleep through the fire. _______________________________________________________________________ Quote: From: andy pugh <[email protected]> To: Greg Bentzinger CC: Enhanced Machine Controller (EMC)Nov 23 at 9:55 AM Message body On 23 November 2016 at 16:47, Greg Bentzinger <[email protected]> wrote: > Being a BridgePort type clone you need FWD and REV because what is considered > FWD depends on if you are in High Gear (500-4000) or Back gear (low) 60-499 > RPM. I see a very simple solution: Fit a microswitch on the high/low speed gear selector and use that to operate the reverse input. /Quote: Andy I have seen that done a few times, and each instance it looked as if the slightest touch would cause the switch to fall off. I have seen this done using nothing more than double sided tape with exposed spade wiring. - This is not for me right now. However, after this machine has allowed me to get caught up I will dig into my 1990 KM3P with the Hurco MAX32 control. I hope to revive that 80386/80387 16MHz Dinosaur to its full OEM splendor which really was great for Conversational programming or loading DXF wire frames and defining how they were to be machined. It can also run its tripped down version of RS274D Gcode. When the 1990 KM3p is working I will pull the head on the 1987 KM3 and use the KM3p to do my best to replicate Jon Elson's tooth sensor/encoder mod and also drill through and tap the chassis for a prox sensor which can sense if the back gear is in the lower position and wire this into the spindle direction logic. Also while the head is torn down I will put in fresh bearings for the Vari-Drive supports and any other non Quill spindle bearings. ______________________________________________________________________ Now I have an idea, and I don't know if it is something I can do via HAL or CL or if it would need to be a feature request. Many LCNC machines were manual machines users converted to CNC. Often these machines had step pulleys or gear change levers to set spindle speed at rated motor rpm. Some times step pulleys are removed or reduced to only 2 or 3 speeds and speed would be controlled within that gears range. Running the motor near its rated nameplate RPM helps with proper motor cooling and best torque output. A step pulley Bridgeport head has 8 speeds (IIRC). Running this on a VFD would allow the user to tune (S####) the RPM to eliminate the gaps between the manual speeds, yet run an older non-inverter rated motor near its nameplate RPM (Hz). Now what I would like is a way that the first M3|M4 executed for a given speed range would start the spindle to about 10% or whatever the lowest usable percentage above 10% is - then check tach or encoder feedback to verify that the machine is in the proper manually selected gear. This start at 10% and once proper gear is confirmed, go to programmed S#### would only need to be done on the first M3|M4 for that speed range and would not need to be done again until a S#### that falls beyond that gear range is called. Am I making any sense here? Almost always the spindle is not under any load but its own inertia until after a spindle at speed signal is active, so running the motor at 10% for a second should have minimal effect other than the brief pause. Likewise the test would be complete before any spindle sync motion call would be started. Thanks for the feedback. Greg out Yonder in Yoder CO. ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
