Re: [Emc-users] oversize transformer question
Mark Pictor wrote: > What are the drawbacks of an oversized transformer? Bulky, not as > efficient, ??? > > The one I am looking at is a little over 2 times the size I > guesstimated that I need. At $100+ for shipping, I'm not sure if > it's worth it or not. It would allow future expansion, but would > probably still be overkill. There are lots of transformers out there. I sure wouldn't pay $100 shipping for a transformer except in very special cases! There HAS to be a better deal somewhere, unless this is a 5+ KVA transformer, or you need it FedEx'ed next day. Jon - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] oversize transformer question
What are the drawbacks of an oversized transformer? Bulky, not as efficient, ??? The one I am looking at is a little over 2 times the size I guesstimated that I need. At $100+ for shipping, I'm not sure if it's worth it or not. It would allow future expansion, but would probably still be overkill. Thanks Mark - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Threading Hickups
On Tue, Oct 16, 2007 at 09:06:29PM -0500, Jon Elson wrote: > With the spindle running, you should see > regularly-spaced narrow pulses on index. If they are not > regularly spaced, you are picking up noise on the encoder index > channel. If you are getting some threading passes in the wrong place, I agree this is what's happening. - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Threading Hickups
Kirk Wallace wrote: > After having some success with my tuning, I went back to making threads > without much success. Randomly, but close to every third or fourth pass > comes out being about a half thread off. I have Halscope graphs here: > > http://www.wallacecompany.com/cnc_lathe/HNC/emc2/g76-bad.png > > http://www.wallacecompany.com/cnc_lathe/HNC/emc2/g76-good.png > What you want to do is put ppmc.0.encoder.02.position, (or whichever axis is the spindle encoder), ppmc.0.encoder.02.index-enable and ppmc.0.encoder.02.index on the halscope. With the spindle running, you should see regularly-spaced narrow pulses on index. If they are not regularly spaced, you are picking up noise on the encoder index channel. > They aren't annotated but have the same configuration as my other > graphs. > > For a reference, I put a bar in the collet and touched off. I invoked my > G76 program and E-stopped after the first pass. I then touched-off X > such that the cutter came close to the bar, but not touching on the last > pass of the G76. I re-ran the program and screen copied good an bad > passes determined by comparing the tool position to the reference pass I > made at the beginning. I can't really see much difference between the > "good" and "bad" graphs ,but there was an obvious indication with the > tool and reference pass. I don't actually see much difference in the two graphs except for the trigger point. But, then the computer doesn't know the wrong place has been picked up by the encoder index signal, so the graphs shouldn't look different. But, if you display the enocder index signal too, then you will clearly see if there is an index in the wrong place. > > I assume that the spike in the spindle velocity data is due to a counter > reset at the start of each pass? > > Another problem, that I had read about a while back, cropped up too. > When I invoke the touch-off dialog, I get a "Bad Number" error unless > the first thing I do is forward arrow and leave at least the original > leading zero in the data entry box. The message just means whatever is in the box isn't valid - just correct the characters in the box. For instance, "-" or "." are invalid all by themselves, but "-.5" is OK. Jon - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Threading Hickups
After having some success with my tuning, I went back to making threads without much success. Randomly, but close to every third or fourth pass comes out being about a half thread off. I have Halscope graphs here: http://www.wallacecompany.com/cnc_lathe/HNC/emc2/g76-bad.png http://www.wallacecompany.com/cnc_lathe/HNC/emc2/g76-good.png They aren't annotated but have the same configuration as my other graphs. For a reference, I put a bar in the collet and touched off. I invoked my G76 program and E-stopped after the first pass. I then touched-off X such that the cutter came close to the bar, but not touching on the last pass of the G76. I re-ran the program and screen copied good an bad passes determined by comparing the tool position to the reference pass I made at the beginning. I can't really see much difference between the "good" and "bad" graphs ,but there was an obvious indication with the tool and reference pass. I assume that the spike in the spindle velocity data is due to a counter reset at the start of each pass? Another problem, that I had read about a while back, cropped up too. When I invoke the touch-off dialog, I get a "Bad Number" error unless the first thing I do is forward arrow and leave at least the original leading zero in the data entry box. Any help with these would be appreciated. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Can anyone recomend me some Stepper Motor Drive
A good place to start is: http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl John On 15 Oct 2007 at 16:11, [EMAIL PROTECTED] wrote: > Hello everybody, i'm trying to make my own CNC Machine with EMC based > as control, and i dont know how start, i mean what Stepper motor > drive interface i need, or if exist some guide to build one, maybe > i'm can build it, i has see some examples in internet using Darling > Transistors, .. i has read about the Parallel port .. but something is > no clear. > > For example, what is your recomendation about the Driver card for > Parallel port and.. motors, if anyone can recomend me a brand and type > of servo motors for start my experiment, i want to attach in Milling > machine, but for start.. i only want test.. > > I'm not sure but, i think, i need a Stepper motor drive interface with > the capacity for use motors, depends of the capacity ... what amp have > that motor, how much big is.. what voltage.. and that thinks.. > > Well excuse me for all that questions.. mm if anyone have a guide > about how to build a prototype or a list of hardware to test EMC > linux, please answer Thanks in advance guys!! - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
