Hi Guys;
I have had terrific results with the double diaphragm couplings.
They don't change velocity during the rotation when misaligned.
They don't create friction when misaligned. Only a very slight torque to
flex the diaphragms.
They are very high torque tolerant. I rammed a small one to the stops many
times
with a 4000 inch ounce (20 ft lbs) torque motor during setup.
I am so partial to them, I made my own when I was unable to buy a small one
for
a confined space. It was rammed against the stops also and is still working.
Hope this helps.
Don
On Thu, Feb 14, 2013 at 12:19 PM, 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
> >>>>>
> >>>>>
> >>>>
> >
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> >> --
> >> Billy Huddleston Inner Vision
> >>
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> --
> 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.*
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