Well fellas, still working dilligently on the wiring diagram for my retrofit. Have made some decisions and have reconsidered some decisions. Right now I am thinking about the spindle and the eventual toolchanger setup. This machine has a 7.5hp motor that is coupled to the spindle with a dual timing belt. The existing machine used a resolver on the motor and a set of three switches that received information from a came lobe built into the spindle body to tell the motor when it was on toolchange position or 180degrees out. Then apparently the resolver would do the rest. I think that may be overcomplicated and have been considering making a slot wheel that would be attached to the spindle body itself and use some leading edge timing with a photointerruptor or other sensor to locate toolchange position as well as track spindle speed for rigid tapping operations. I would love to hear from you guys about what you recommended for this setup. Is a single position wheel ideal or is it better to try to adapt an encoder to it. I want to have the most simple dead reliable situation with the toolchanger control and spindle alignment is paramount for that. I will be using a simple vfd so there will probably be a need for a low speed alignment somehow ....any ideas or suggestions will be appreciated. Thanks and Good Mornin'! !!
Pete On Thursday, February 14, 2013, Billy Huddleston <[email protected]> wrote: > 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! 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