On Thursday 14 February 2013 14:14:52 Billy Huddleston did opine: > My understanding is you use nylon for compliant couplings (ones that > need a bit of give or backlash) and the Acetal disks which are zero > backlash. The only way they're not good with backlash is if you have a > high degree of offset (unlikely in your machine) and you have a high > amount of ware on the disk.. again, more ware if you have more > offset... > > http://www.couplingtips.com/oldham-couplings/ > > Again, I like the fuse feature of the oldham's.. Just my two cents > worth. :) >
So do I, and as my disks are made from the same steel as the hubs, the wear has been effectively zilch. I had one off a year ago, and the machining marks in the mortise's or the tenon's aren't even polished away yet. My goal was obviously zero breakage, and has been met. With my early cobbling of motor mounts, I am sure there is some angular miss-alignment too. They simply don't care! > On 02/14/2013 12:08 PM, Pete Matos wrote: > > Billy, > > > > I am fairly familiar with the oldham style couplers and they have > > some > > > > advantages but I was under the impression they are less than great in > > the backlash area. I want this machine to be able to transmit the > > full power of these motors to the screws and do it without any > > backlash at all....zero... There is enough backlash in any ballscrew > > assembly with the thrust bearings and the ballnuts etc. I don't need > > to be adding to it here. > > > > So far those disk type ones seem to offer some misalignment and > > offset > > > > protection yet still allow zero backlash and the ones in the sizes I > > need are stainless steel it seems. Dunno how much those cost but I > > am sure it is not cheap. Peace > > > > Pete > > > > On Thursday, February 14, 2013, Billy Huddleston <[email protected]> wrote: > >> I like oldham couplers the best. If you have a run-away, the only > >> thing > > > > that breaks is the disk. Yes.. they can wear out if you have a bad a > > major misalignment.. but, in general > > > >> they last a long time. The also are easier to install because you > >> can > > > > install each hub on the shafts and then just insert the motor.. you > > don't have to try to undo the hub if you > > > >> need to remove the motor. I like them better than love-joy or > >> spider > > > > type too because those have a bit of give in them. Helical or Beam > > couplers are nice for Routers, but, on > > > >> this sized machine, you would need to use stainless steel ones, and > >> not > > > > aluminium, AND, you might still have windup issues.. > > > >> Here is a good video on the disk acting as a "fuse" around the 1:04 > >> mark.. > >> > >> Oldham Coupling | RULAND > >> > >> Thanks, Billy > >> > >> On 02/14/2013 11:21 AM, Pete Matos wrote: > >>> Dave, > >>> > >>> Honestly I have never heard of those before and I am lost > >>> when it > >>> > >>> comes to all of the specifics of couplers for my mill. Those look > >>> pretty cool but I did not like hearing of the broken split beam > >>> ones from that other fellow. I was liking the looks of those. The > >>> disk type apparently > > > > are > > > >>> heavy duty and I am now investigating those models. Some of the > >>> websites don't show pricing and that often means if you have to ask > >>> you cannot afford it LOL.... What kind are they using in modern > >>> Machining centers nowadays? Peace > >>> > >>> Pete > >>> > >>> On Thursday, February 14, 2013, Dave <[email protected]> wrote: > >>>> If you can find them at a reasonable price (ebay?) > >>>> > >>>> The stainless steel bellows type couplings are very good even in > >>>> high torque applications. > >>>> > >>>> The price is right! > > > > http://store.reuseum.com/Gerwah_AKD30_20mm_Bellows_Coupling_Motor_Coup > > ler_p/000011213016B13Store.htm?gclid=CN2uyZ6VtrUCFYs7MgodIQUAEQ > > > >>>> Dave > >>>> > >>>> On 2/14/2013 9:33 AM, Todd Zuercher wrote: > >>>>> Helical beam are great for lower tourque aplications. But I was > >>>>> having > >>> > >>> problems breaking them, and oldhams wear out much to quickly. I > >>> havn't > > > > had > > > >>> a flexible ss disk style fail on me (yet) but I have only been using > >>> them for about a year on the machine that was giving me problems > >>> breaking the helical beams. All of our realy big routers used the > >>> flexible steel disk type or something simular OE. > >>> > >>>>> ----- Original Message ----- > >>>>> > >>>>> On 13.02.13 16:17, Pete Matos wrote: > >>>>>> I have actually looked at Mcmaster carr as I usually do but > >>>>>> did > > > > not > > > >>> see > >>> > >>>>>> what I needed. I actually like the looks of those cut bodied > >>>>>> couplers > >>> > >>> but > >>> > >>>>>> I am not too sure of their misalignment ability. A quality > >>>>>> oldham in > >>> > >>> the > >>> > >>>>>> right size should work fine I think....peace > >>>>> > >>>>> I've never done any measurements, but figure that the "helical > >>>>> beam", > > > > or > > > >>>>> whatever you want to call them, couplings ought to have the lowest > >>>>> backlash. An Oldham coupling must wear out, Shirley? > >>>>> > >>>>> Erik > > > > ---------------------------------------------------------------------- > > -------- > > > >>>> Free Next-Gen Firewall Hardware Offer > >>>> Buy your Sophos next-gen firewall before the end March 2013 > >>>> and get the hardware for free! Learn more. > >>>> http://p.sf.net/sfu/sophos-d2d-feb > >>>> _______________________________________________ > >>>> Emc-users mailing list > >>>> [email protected] > >>>> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ---------------------------------------------------------------------- > > -------- > > > >>> Free Next-Gen Firewall Hardware Offer > >>> Buy your Sophos next-gen firewall before the end March 2013 > >>> and get the hardware for free! Learn more. > >>> http://p.sf.net/sfu/sophos-d2d-feb > >>> _______________________________________________ > >>> Emc-users mailing list > >>> [email protected] > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> -- > >> Billy Huddleston Inner Vision > >> > >> *William Huddleston > >> Inner Vision Development Corp* > >> Office: 865.560.2752 > >> Fax: 865.560.2703 > >> > >> http://www.ivdc.com > >> *Development and Consulting... Simplified.* > >> > >> <http://www.facebook.com/pages/Inner-Vision-Development/120023721424> > >> < > > > > http://twitter.com/ivdc> <http://www.linkedin.com/in/ivdccorp> > > > > ---------------------------------------------------------------------- > > -------- > > > >> Free Next-Gen Firewall Hardware Offer > >> Buy your Sophos next-gen firewall before the end March 2013 > >> and get the hardware for free! Learn more. > >> http://p.sf.net/sfu/sophos-d2d-feb > >> _______________________________________________ > >> Emc-users mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ---------------------------------------------------------------------- > > -------- Free Next-Gen Firewall Hardware Offer > > Buy your Sophos next-gen firewall before the end March 2013 > > and get the hardware for free! Learn more. > > http://p.sf.net/sfu/sophos-d2d-feb > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> Father, forgive me, I've been caught using Windows... I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
