Not all of the are $600. Here is a size 14 "F" type for $125. But you need to add your own stepper motor. ebay.com/itm/Harmonic-Drive-HD-Systems-HPG-14A-21-F0CBKS <https://www.ebay.com/itm/Harmonic-Drive-HD-Systems-HPG-14A-21-F0CBKS-SB-Gearhead-Servo-Reducer-Ratio-21-1/172852806711?_trkparms=aid%3D888007%26algo%3DDISC.MBE%26ao%3D1%26asc%3D41375%26meid%3D4af9911c4b374f95b2633887d25cc222%26pid%3D100009%26rk%3D1%26rkt%3D1%26sd%3D272852528717&_trksid=p2047675.c100009.m1982>
On Thu, Dec 21, 2017 at 2:42 PM, John Dammeyer <[email protected]> wrote: > I managed to get the Canadian Rep for the Harmonic Drive to give me an idea > of price of the upgraded version of the FHA-25B-6015-E150; the FHA-25C > series. > Seems, with drive, one goes for almost $4K Cdn. I was asking because I > potentially have a commercial project for them. Also turns out that their > big market is robotic arms in China and lead time is 39 weeks. > > So when you see the older model, brand new on EBAY for $2070US and that's > without a drive ($599 US on EBAY) the new price makes sense. > > https://www.ebay.com/itm/HARMONIC-DRIVE-New-FHA-25B- > 6015-E150C-FH2000-AC-SER > VO-ACTUATOR/232535240729?hash=item36242e3019:g:4bAAAOSwXrdZ7vsm > > John > > > > > -----Original Message----- > > From: Chris Albertson [mailto:[email protected]] > > Sent: December-21-17 1:38 PM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Off topic: wolfrom drive > > > > Buying on eBay means waiting, checking every few days and waiting. But > you > > do eventually find one. > > Part numbers and specs here: > > http://www.harmonicdrive.net/_hd/content/documents/hpg-catalog.pdf > > > > About 15 second into this he tells you how to read part numbers > > https://youtu.be/mmOnktzifeg?t=1m33s > > > > The nam "harmonic" is trademarked so there is only one company making > > these. Buy a new one for $850 to $1,200 or for 20% of that used on > eBay. > > > > > > As for Prius junkyard parts. They are a little rare as not many have > been > > junked yet as the cars have only been on the road in numbers to 10 or 12 > > years. Car crashes are the only source of parts. Also who really needs > > something that powerful? The bike wheel hub seems better. > > > > But it does look like the 3rd gen Prius uses exactly this drive, two > > internal ring gears and two sets of sun/planet gears. > > > > Do watch the above youtube, this guy as an excellent machinist and > explains > > what he does. In this case he builds a 4th axis for his CNC Mill and > router > > > > > > On Thu, Dec 21, 2017 at 12:34 PM, Gene Heskett <[email protected]> > > wrote: > > > > > On Thursday 21 December 2017 12:39:16 Chris Albertson wrote: > > > > > > > On Thu, Dec 21, 2017 at 2:12 AM, Gene Heskett <[email protected]> > > > wrote: > > > > > On Thursday 21 December 2017 04:18:46 Chris Albertson wrote: > > > > > > To make this really work for rotary tables you need a very fine > > > > > > pitch. I have seen these 3D printed in plastic but they slip and > > > > > > don't handle much torque because the outer ring deforms > > > > > > One idea I had was to press fit the plastic ring gear into a > short > > > > > > section of steel pipe. > > > > > > > > > > > > Put you can buy these drives already made for about $250. That > > > > > > is really not abad price for arc-second level precision and near > > > > > > zero backlash. > > > > > > > > > > Where? > > > > > > > > I wrote that before I figured out how to see the video. On eBay you > > > > can fin harmonic drives. They do the something(roughly 1:100 > > > > reduction) but actually better accuracy. > > > > Here are a few: ebay.com/sch/i.html?_nkw=harmonic+drive... > > > > > > <https://www.ebay.com/sch/i.html?_nkw=harmonic+drive&_in_kw=1&_ex_k > > w=& > > > > > >_sacat=0&_mPrRngCbx=1&_udlo=50&_udhi=275&_ftrt=901&_ftrv=1&_sabdl > > o=&_sa > > > >bdhi=&_samilow=&_samihi=&_sadis=15&_stpos=90278&_sargn=- > > 1%26saslc%3D1&_ > > > >salic=1&_sop=12&_dmd=1&_ipg=50> > > > > > > All but 1 in that 3 page list do not give a list of dimensions, 2 - 4 > > > others only list as needing an 8mm drive end input. Many are obviously > > > incomplete even, I certainly cannot come to any conclusion as to > whether > > > or not I could use one of them in on my small mill with its limited Z > > > overhead. > > > > > > One outfit even goes so far as to show us 3 warehouse racks full of > > > boxes, as if we could blow the pix up and see what the box says on it. > > > > > > And the $170 version seems to be guts only, without the internal rack. > > > Maybe I'm to be considered dumb because I don't know them from long > > > familiarity with using them, but so is assuming everyone has a pile of > > > makers catalogues reaching back 30 years so we can look it up by the > > > part number. > > > > > > Sheesh. > > > > > > I will say thank you Lawrence, specifically for the code you carved a > > > lathe encoder wheel with all those years ago. I've rearranged it some, > > > and adjusted the sizes and slot counts, and made a few disks from it > > > myself. The one on TLM is about as small as it can be and still be > > > functional. I lost another 1/2" of OD trying to fit it into a G0704, > and > > > just replaced its a/b signals with a 1000 line omron on the rear of the > > > motor. The index I still get from the disk on the spindle. Thank you > > > for the loan of that code from the wiki. > > > > > > > > > On Wed, Dec 20, 2017 at 10:15 PM, Lawrence Glaister > > > > > > <[email protected]> > > > > > > > > > > wrote: > > > > > > > very cool Gene.... had some troubles playing the video, but I > > > > > > > seem to have the gist of it. It does seem like a very > > > > > > > interesting design for rotary tables.... just have to figure > out > > > > > > > how to re-purpose some rear end ring gears and pinions.... > > > > > > > hmmm... was thinking of regearing the jeep anyway!. Lawrence > > > > > > > Glaister VE7IT > > > > > > > > > > Now theres a recipe for some bigger machinery, > > > > > > > > Maybe a better source of parts would be a Toyota Prius viable ratio > > > > transmission. It is already set up with planet gears that match the > > > > ring. The parts come off without even needing tools. > > > > See the ring and planet gear on the left and center of this video. > > > > Junk yard price is about $300. Also notice the two electric motors. > > > > They could like be repurposed. > > > > > > Link? > > > > > > > > -- > > > > > > > > Chris Albertson > > > > Redondo Beach, California > > > > ------------------------------------------------------------ > ---------- > > > >-------- Check out the vibrant tech community on one of the world's > > > > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > > _______________________________________________ > > > > Emc-users mailing list > > > > [email protected] > > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > 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> > > > > > > ------------------------------------------------------------ > > > ------------------ > > > Check out the vibrant tech community on one of the world's most > > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > _______________________________________________ > > > Emc-users mailing list > > > [email protected] > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > > > -- > > > > Chris Albertson > > Redondo Beach, California > > > ------------------------------------------------------------ > ---------------- > -- > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
