Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread Chris Albertson
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

Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread John Dammeyer
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 t

Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread Chris Albertson
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

Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread andy pugh
On 21 December 2017 at 20:34, Gene Heskett wrote: > 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 ba

Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread Gene Heskett
On Thursday 21 December 2017 12:39:16 Chris Albertson wrote: > On Thu, Dec 21, 2017 at 2:12 AM, Gene Heskett 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

Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread Chris Albertson
Sorry, here is the video https://youtu.be/dLNDGUISTYM?t=9m38s NOTICE. We see the first set of planetary gears THEN the guy reaches over and picks up the SECOND set of sun/planet gears and shows how the assemble onto the shaft.The neat part about Toyota design is ease of assembly./disassembly.

Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread Chris Albertson
On Thu, Dec 21, 2017 at 2:12 AM, Gene Heskett 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

[Emc-users] Ethercat hardware

2017-12-21 Thread Nicklas Karlsson
I made my own Ethercat card similar to this one http://www.microchip.com/DevelopmentTools/ProductDetails.aspx?PartNO=EVB-LAN9252-SPI which I could buy. It have little bit different connecter, ordinary 2.54mm header instead of the fine pitch connector. It have connector with SPI connector + SYNC

Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread Kenneth Lerman
The issue I see is how to machine this so that it fits "perfectly" so as to have zero backlash. An alternative might be to have three sets of planetary gears with some sort of spring loading so as to take out the "slop." Ken On Thu, Dec 21, 2017 at 5:21 AM, Gene Heskett wrote: > On Thursday 2

Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread andy pugh
On 21 December 2017 at 03:36, Gene Heskett wrote: > Grumpy's video is now on my site in the sig, with a link from the front > page. Enjoy. Sure, its only plywood, but it works as a proof of > concept. I may see if I can make one in steel, with bearings. A useful source of components might be bi

Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread Gene Heskett
On Thursday 21 December 2017 04:47:46 Roland Jollivet wrote: > The video shows only one planetary gear, which is obviously two gears, > stacked. > > Can there be three planetary gears, maybe each with a different > top/bottom offset? > I can't figure out if it would work, or just jam up? > I think

Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread Gene Heskett
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

[Emc-users] Off topic: wolfrom drive

2017-12-21 Thread Roland Jollivet
The video shows only one planetary gear, which is obviously two gears, stacked. Can there be three planetary gears, maybe each with a different top/bottom offset? I can't figure out if it would work, or just jam up? On 21 December 2017 at 11:18, Chris Albertson wrote: > To make this really wo

Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread Chris Albertson
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

Re: [Emc-users] Off topic: wolfrom drive

2017-12-21 Thread Chris Albertson
That's great. How is it built and of what materials. You can always post a video to You Tube On Wed, Dec 20, 2017 at 9:36 AM, wrote: > I got my first prototype working. It came out to be 60:1. > sun = 15 > first planet = 15 > first ring = 45 > second planet = 14 > second ring = 45 > I have a