On Wednesday 16 September 2015 04:50:41 andy pugh wrote: > On 16 September 2015 at 02:15, Gene Heskett <ghesk...@wdtv.com> wrote: > > With no feedback, the motor hits about 10 > > grand in about 1 second flat. > > > > I may have to fix that with some hal magic, ought to be easy enough. > > :) > > You could limit the duty cycle unless abs encoder velocity > 10rpm or > similar.
Thats one way, but I'll probably base it on a retriggerable. If in 20 ms, no pulse is seen by the encoder, hit the stop button & shut it down. I think that may be something I can extract from my encoder filter's comp.filter module. If the next sample from the encoder (its in a 5i25), is the same as the present contents of the first stage s/h, then there is no new data and the filter is not updated, and if that equals outout is true for some arbitary time that would never occur if its turning at say 50 rpm, the retriggerable will time out and hit the stop button. That however won't save it from breaking the xl belt under load like it did over the weekend. Belt had an aramid fiber back, just enough to see it, not a huge amount of it IMO. My research on the web says that belt is available in several different strengths, with the strongest rated at 5900 whatever units, but many/most are in the 1700-2300 range. What the belts I was able to get overnight from MSCDirect are is unk, and at the sheckles asked can't be the ultra strong ones, so I bought a pair. They knew the brand name only, GoodYear, so I suspect these are not anywhere near the equ of the steel backed versions, which have a minimum small pulley radii, I assume because of flexure fatigue failures when wrapped around a small pulley. Both of the belts I'll put in today, once the coffee kicks in, are longer, the 160J6 from the motor to the jackshaft is being replaced with a 170J6 so the motor can lay back & down from its present, pulls that belt way too tight by the time the 3rd adjuster bolt is in position. Perhaps leaving it loose enough it could actually slip & save the XL belt? Those J6 belts have many times the pull power of a single vbelt. So some slippage there might be a safety feature. The combo of that & the XL belt being a 126mm, 63 cogs but the new ones are 130mm, 65 cogs, will lower both the jackshaft a couple mm's, making its mounting bolts, currently access blocked by the Z screw, accessable to a socket wrench and tilt the motor lower at the same time. I had to cut the lid of the box its all in and make it 3/4" taller over the flywheel when I put it back together. I also need to fabricate a strip to cover a gap where the 170J6 exits from under the bed as thats a good place for swarf to enter & cause a short in the motors driver electronics that are on the back wall of this box. Its a good example of shade tree engineering as that was out of sight when its pulled out to gain access to the left end of it to work on this. :) About 5 square feet of wrecked UPS stepvan 1/8" thick sheet alu siding were "sacrificed" to make it. Thats the Iowa farm boy recycling & make it do in me, too cheap to buy it new. :) Now, go make some plasma, this cup was yesterdays leftovers. :) 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 Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
