On Thursday 14 February 2013 11:26:47 Pete Matos did opine: > 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
I think the confusion is almost normal Pete. For instance, I am using some cheap ebay sourced helical couplings on my lathe. Because the motor shafts are small, 6.35mm, one of the things I had to do was to lubricate the clamp screws because they were threatening to strip out by the time enough grip was attained to stop a 425 oz motor, so in addition to that, I wound up superglueing them. Windup of the helicals can be detected if the screws are locked, but is not more than 3 or 4 degrees, and has always sprung back. Dull or chipped edges in the chips in the tools may throw it off by a thou, but they are usually detected, feed rates are slid to zero as is the spindle over-ride, the QC holder removed and the chip replaced before the cut is finished. For me on a small job 2 days back, windup was not a problem as I had put 2 'spring passes' in my code without removing a measurable amount of metal once the chip was fresh & sharp. I was expecting the spring passes to be needed, but that seems to have been an artifact of a previously poorly adjusted carriage. > 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_Couple > r_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 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> Power, like a desolating pestilence, Pollutes whate'er it touches... -- Percy Bysshe Shelley 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
