Greetings; I went out and wired up a breadboard, using software stepping, including 2 of the 3 motors today, setting quite leasurely timings in the opto drive, but ran into a stepconfig limit when entering the horrible latency of this computer, finding stepconfig cannot set a base thread any slower than 50 u-s. I made the motors turn the correct amounts I think, so I saved it and ran lcnc to the new config. Boom at launch a realtime delay by the time it had drawn the axis screen. But what the heck, its a test.
Looking at the waveforms with that slow pocket scope, it appears the on-off transition is the slower of the two, but is capable of a 2 or 3 microsecond reset time on the port. The drivers are faster than that by a good margin, so when the 5i25 arrives, I can probably use a .75 u-s reset time & can then move the motors quite a bit faster. I also wheeled that isolation tranny to where I could take a meter to it and read the label, it has two windings and 5 leads as there is a green wire that may be to a static shield between the windings or ??? Each winding is rated 127 volts and about 17 amps. It has a hole filling central plug, with a nylon strap fixed so it can be used as a handle to carry it. I haven't investigated how hard it would be to drive out the plug, and uncover it enough to be able to remove a few turns to lower the secondary voltage. I did some ebay searching, but haven't found anything I could use as a 24-36 volt buck, yet. A 36 volt buck should give me about 127 volts dc with a cap input filter, which sounds about the right ballpark. The thought crosses my mkind to use a choke input filter, which would also, given enough Henry's, would be about the same voltage, BUT a shutdown from heavy drive would quite likely run the output up to blow the caps levels unless I could find the correct varistor to absorb the surge, and that seems to require some knowledge of the black arts I haven't had to use yet from a design standpoint. I don't have Jons driver yet either, or the 5i25 & hopefully faster BoB, so I seem to have some downtime, which if I feel like starting it tomorrow, might be time to start on the mill teardown and see about getting the Y screw installed, or the Y carriage machined for the X nuts pocket as I've seen on youtube. My toy mill can do that easy enough, and a hell of a lot neater job than the guy on youtube did using a drill press. I also noted that Hoss has put some better ball bearings in the spindle, in his, which it appears I will have to do too, these roller bearings in it now will never run cool enough to be useable when 15 minutes no load wide open runs the bottom of the quill up to around 170F and makes it drip grease. No way in hell to control the spindles growth and do precise work with it heating like that. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Monitor 25 network devices or servers for free with OpManager! OpManager is web-based network management software that monitors network devices and physical & virtual servers, alerts via email & sms for fault. Monitor 25 devices for free with no restriction. Download now http://ad.doubleclick.net/ddm/clk/292181274;119417398;o _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
