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. :) 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_Coupler_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 -- 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
