one more.. https://www.youtube.com/watch?v=_7skJhKzU7Y
Dad is having too much fun... sam On 07/11/2013 08:43 PM, sam sokolik wrote: > quick threading video.. (yes - not the correct cutter - and the exit > move is a bit shallow.. but shows the spindle sync is right on...) > > https://www.youtube.com/watch?v=ERMizV-yy8U > > sam > > On 07/11/2013 02:56 PM, sam sokolik wrote: >> Seems to run nice at 40ipm >> >> http://electronicsam.com/images/emco/EMCOThreading.JPG >> >> video soon... >> >> >> On 7/9/2013 11:34 AM, sam sokolik wrote: >>> ok - some cool news I think. So - with the switch on the interface >>> board set to off (non step/dir mode) the control signals are 4 phase >>> drive. (seems to be unipolar). pins 2 through 5 control one axis - 6 >>> through 9 control the other. I hacked a hal file to setup stepgen to >>> output 4 phase (patterns 5 through 10). >>> >>> First tried pattern 9 (Unipolar Half Step) because the scale was setup >>> for that. >>> the performance was the same. 20ipm max and would probably have to back >>> that off... >>> >>> Second was pattern 10 (Bipolar Half Step) I know - not likely - and it >>> wasn't. Didn't like it. >>> >>> Third was pattern 5 (Unipolar Full Step) I halved the axis scales also. >>> similar performance.. 20ipm max. (and sound so far was pretty crappy) >>> >>> fourth was pattern 6 (Unipolar Full Step (two windings on)) >>> Holy crap. That sounds nice. maxed out at 30ipm and didn't try any >>> faster. Full stepping is .00054ish per step. Workable for sure. >>> >>> That is what the original control/software maxed out at. I will try >>> faster when I get a chance. >>> >>> That is totally usable with linuxcnc - no mods to the control. I need >>> to hook up the index and 100ppr and try some threading! >>> >>> One thing to try is - I think I can put the interface board back into >>> step/dir and full step. I don't know what pattern it does though. >>> >>> sam (happy dancing..) >>> >>> >>> >>> On 7/8/2013 7:13 AM, sam sokolik wrote: >>>> We got a few of these lathes from a local school. they are cute little >>>> cnc lathes. >>>> The technology is pretty old though. The steppers are 72 steps per rev. >>>> >>>> I found this >>>> http://www.maxton.com/ebay/emco/EMCO%20Compact%205PC%20Conversion%20to%20Mach3.pdf >>>> >>>> which talks about converting to mach. They remove the octal latch and >>>> jump through it. >>>> I wanted to see if I could get linuxcnc to drive the board without >>>> hacking the latch out. >>>> >>>> this is what I have found/figured out >>>> >>>> I think this is correct.. (this is with switch 1 on the interface board >>>> set to >>>> 'on' which puts the board into step/dir) >>>> >>>> x step pin 2 >>>> x dir pin 3 >>>> z step pin 4 >>>> z dir pin 5 >>>> index pin 12 >>>> estop pin 11 >>>> 100 ppr sensor pin 10 >>>> 74ls374 enable pin 14 >>>> 74ls374 clock pin 1 >>>> >>>> I setup linuxcnc to send a pulse at every base period for the 'clock' >>>> that latched the outputs of the chip. (thanks Jeff E for the idea) this >>>> is using the >>>> 'reset' option of the printer port that allows for a cycle within each >>>> base period >>>> the same feature that makes 'double step' work. This allows me to >>>> 'latch' the >>>> 74ls374 each base period with the current step/dir pattern. It seems to >>>> work >>>> >>>> Now it took me a bit of tinkering to figure out that I didn't read the >>>> above article >>>> well enough to notice that you needed to set a switch to put the emco >>>> interface >>>> board into step/dir mode. During this time I was flipping bits on the >>>> printer port >>>> to try to figure out why it wasn't working. I think by default the >>>> interface is setup >>>> as phase drive. (4 phases per stepper) as I think I was flipping all 8 >>>> data bits on >>>> the printer port and was getting stepper clunking. >>>> >>>> Well - the performace of these drives/steppers are pretty poor. (assuming >>>> I have the timing right - and I didn't get too much time to play with >>>> it.) In the >>>> above article they talk about around 20ipm is about max. That is what I >>>> was >>>> seeing - plus there is a weird interaction when you run both axis at once. >>>> (they get quite a bit noisier for some reason). Now it could be that I >>>> don't quite >>>> have the timing correct - like maybe the step/dir needs to be inverted or >>>> or something - I will play with it more. >>>> >>>> I would also like to switch it back to non-step/dir mode. (phase drive >>>> maybe?) >>>> because there might be a reason the original software used it.. (better >>>> performance?) plus I think I have the original software and would like >>>> to try >>>> it out also. (need to setup a pure dos machine to test) >>>> >>>> lathe >>>> http://www.electronicsam.com/images/emco/emcoclose.JPG >>>> interface/drive >>>> http://www.electronicsam.com/images/emco/interfaceanddrive.JPG >>>> >>>> sam >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> ------------------------------------------------------------------------------ >>>> This SF.net email is sponsored by Windows: >>>> >>>> Build for Windows Store. >>>> >>>> http://p.sf.net/sfu/windows-dev2dev >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>> >>>> >>> ------------------------------------------------------------------------------ >>> See everything from the browser to the database with AppDynamics >>> Get end-to-end visibility with application monitoring from AppDynamics >>> Isolate bottlenecks and diagnose root cause in seconds. >>> Start your free trial of AppDynamics Pro today! >>> http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >>> >> ------------------------------------------------------------------------------ >> See everything from the browser to the database with AppDynamics >> Get end-to-end visibility with application monitoring from AppDynamics >> Isolate bottlenecks and diagnose root cause in seconds. >> Start your free trial of AppDynamics Pro today! >> http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > ------------------------------------------------------------------------------ > See everything from the browser to the database with AppDynamics > Get end-to-end visibility with application monitoring from AppDynamics > Isolate bottlenecks and diagnose root cause in seconds. > Start your free trial of AppDynamics Pro today! > http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ See everything from the browser to the database with AppDynamics Get end-to-end visibility with application monitoring from AppDynamics Isolate bottlenecks and diagnose root cause in seconds. 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