On Wednesday 20 February 2019 04:34:14 Lester Caine wrote: > On 20/02/2019 06:01, John Dammeyer wrote: > > And I realize this is not the majority opinion. > > The main problem here is that to China the rest of the world IS a > minority market. The cost of translation to even just English is > something they don't need to bother with WHILE they had sufficient > sales in country, and the likes of newker-cnc are producing turnkey > systems rather than parts we can use. The major flaw with ALL of this > is that this kit is designed to reduce the reliance on the very > commodity that was cheap in China and the rest of the 'developing' > world - people? And it's the same problem the world over? The > automotive sector which is a majority market for this kit just like > the steel and other raw material industries below have more capacity > than customers able to pay the prices? The days of buying a new car > every couple of years just like a new phone, laptop and even mill or > lathe are a thing of the past and it's time to make all of these > disposable turnkey products into something that can be 'upgraded' > which needs to be addressed, so we can add the latest improvements to > last years kit without having to ditch the whole lot. Mine and the > wife's cars are 10 years old - and Korean - and still going strong - > my son bought a UK built Range Rover which has been off the road for > months while he tried to find a new engine because the old one had > failed with a 'problem these engines just don't get'. > > Unless we can make money from this kit for many of us it IS just a > hobby activity? So paying inflated prices for the core components has > to be justified when one can buy turnkey packages at a tenth the price > knowing one will probably spend another tenth improving things ... > which is exactly what I did with the 3D printer. And the basic kit > from china was a quarter of the price of the same kit being punted > under the banner of UK MANUFACTURE when it is nothing of the sort! The > likes of Amazon and eBay need to be made liable for the fraud that > they hide from customers? But we need more openness from all of our > suppliers so we can make kit last longer.
Thats good for a plus 10 right there Lester. And this 6040 I'm building up at the moment is a perfect example. Mechanically its pretty good, particularly the extremely low backlash. Electrically its a piece of shit. Using the cheapest smart driver yet, the TB6560, obviously peak current adjustable but absolutely no docs, its preset, and its designed to be driven by mach3. "its preset", yeah, sure. plug in the 4th axis and the current is obviously too much as the motor is burn you hand hot in just about 10 minutes, and the 24 volt power supply that runs all 4 motors is folded back to about 14 volts Rather that putz with that, go get the 4 driver kit thats been running the failed HF mill for a decade, turn the A driver current down to around 2 amps because the motor looks that small. Works a treat and doesn't heat the A motor any worse than the others now. Might be able to turn it back up one step. Nothing stamped on these motors at all, nothing in the Engrish instructions but how to make mach run it, but they are being moved 10x faster than the HF mill ever moved in its decade of pushing it past 10 ipm and getting stalls. And I had to make dampers for it to get it past 4 ipm. It has a 110 volt vfd, rated for a 1500watt water cooled motor, so obviously the single phase filter cap won't last much longer than the bearings in the motor, meaning both will have to be replaced with higher quality stuff inside of a 2 year time frame, by which time "they" intend to sell me a new one. There are terminals on that vfd to interface it to a spinx1 or similar control, one of the reasons I'm using the 5i25-7i76 combo as I believe I can control it using its vfd interface. But in feeding it a raw pwm signal I found the pwm must swing a full 10 volts in order to get the full speed range. A 99% duty cycle 5 volt signal only gets around 5400 revs, or around 18% of full speed. And I had it running backwards for several hours with zero ill effects in my poking around so I know I can run it backwards with the correct hal configuration. All of which is present in the mesa 7i76 card once I get the 2nd one built up. The box I put it all in needs to be 1/4" deeper to fit the mesa card, but the panels on the first one do bulge a bit when bolted in. The 2nd one will have a bigger cnc4pc C1G version-4 card for the 2nd bob, which will crowd the 2 power supplies so thats todays project, make them fit inside the box. I suspect that will mean jacking up the cards another 3/4" inch or more to make room under the cards, all TBD yet. There is room to do that, and moving the db25 cutouts upwards is not a problem so its not a show-stopper. Making longer standoffs isn't a problem other than the raw materiel. So I am 100% in agreement with Lester, the age of throwaway machines seems to have arrived, and I damned sure don't like it. That, coupled with the poorer stability of our wheezy based install on a pair of intel D525MW boards, does not bode well for LinuxCNC's long term future. 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> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
