On Monday 18 January 2016 06:14:52 andy pugh wrote: > On 18 January 2016 at 01:40, Gene Heskett <[email protected]> wrote: > > Which reminds me, trolling on ebay last night, I came across a 95 > > watt, 60,000 rpm 3 phase spindle with an R11 setup, new, for a > > hundred dollar bill. So I went looking for an inverter. 17 pages of > > inverters later, there was not a single phase powered inverter in > > any size below 2.2KW. > > This one is "only" 1.5kW and runs to 2500Hz. > http://www.ebay.com/itm/1-5KW-2HP-VFD-FOR-ENGRAVING-MILL-7A-SINGLE-PHA >SE-DRIVE-VSD-1-5KW-DRIVE-INVERTER-/252240794914?hash=item3abab91522:g:- >4gAAOSwHaBWjfyV
But it says 0-400 hz. And that motor IIRC only needs 120 volts. But when I went to see if it was still available, the price was $187 USD with $40 USD shipping. It may have been another item number though. Iceweasels bookmarks manager leaves a lot to be desired. Another hit that included the 48mm diameter mounting bracket bracket and apparently the same inverter, was $380 USD and $100 USD shipping. And says the motor is 36volts, 3 phase. That nearly 500 USD is above my pay grade by about 2x. So I guess I'll putter along at 2500 revs and 2 ipm for circuit boards when I need to make some. But my last 60 degree engraving tool, was sharp when I pulled its adapter out of the spindle to put in another .03125 mill for drilling holes, but PCB's gcode exporter drilled some holes too small, and 3 way too big, and missed 3. So that strip of 6 was dust binned. Re-running the exporter for a clean file after doing a lengthwise shrink of about 1/2", I added the missing spot pecks to it, then without rotating it, made it 4 up on the next etch. But the tool had become chipped just laying on the mills table, and wasn't cutting at all clean, so I stopped it, ran the head back up, put it in reverse at 2500, and gently held a badly worn 1200 grit diamond plate against it for about a minute, which seemed to rejuvenate it quite a bit, so I finished the etch, then fixed the drill file using your code, adding the missing holes again too, drilled that and found it wasn't quite big enough for the leads on the schottky diodes, so I raised the diameter of those 4 holes by another 3 thou and re-ran it. Turned it over & hand drilled clearance to the unused copper on the top side of the board, cut it up on the tablesaw, and populated one of them last night. But that motor, at only 48mm in diameter, could be hung on the side of the head casting rather nicely when needed. I've also considered making one, using an o-ring belt drive with about a 1/10 step up to an outboard countershaft, to mount on the spindle nose. I made pulleys for a case tumbler idea but its not been used much, can't get traction between the spinning rods and a plastic Folgers coffee can, and the lid leaks media abrasive, they don't fit tightly enough. I should get a Thumbler but the vibrators are cheaper. So there's the big pulleys. But in scanning for that belt driven spindle, made for a gantry 3020 machine, I keep coming across this: <http://www.ebay.com/itm/1-5KW-WATER-COOLED-SPINDLE-MOTOR-1-5KW-VFD-DRIVE-MILL-GRIND-ENGRAVING-HIGH-LEVEL-/111858311795?hash=item1a0b466273:g:8SAAAOSwYaFWfPrl> $209 USD, free shipping, rated running in the .005mm's. 24k revs. Too bad they don't price it out as a complete kit in the $300 range. But the only complete kit is $470 & shipping from China. What does it take for the water pump, plumbing & whatever is used for a radiator on one of those things? But no water pump, bracket or plumbing on this one. Here is something interesting: <http://www.ebay.com/itm/Fuji-Frenic-Mini-VFD-400Hz-inverter-0-75kW-for-CNC-milling-spindle-/262230698886?hash=item3d0e2aeb86:g:mSoAAOSwX~dWj-HF> $100 USD with shipping from Russian Federation, and he has the motor for $90. That would give me 24k revs, just like the $209 kit with free shipping. Makes the first link above tempting. If I can round up the water pump and plumbing bits & pieces. Anyway, thats the news from Lake Wobegon (Weston), WV, USA 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> ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
