Re: [CAD_CAM_EDM_DRO] Couplings

Hi,

Yes, I sell flexible couplings at a reasonable price.


http://homanndesigns.com/store/index.php?main_page=index&cPath=21



Cheers,

Peter.

Andrew Werby wrote:

> "Alfredo Sola" alfredo@... alfredosola wrote: Good day Johann et
> al, Following your advice on couplings, I found this. It's Chinese but
> looks pretty decent:
> <http://cgi.ebay.de/3x-Kupplung-Drehstarre-fuer-Schrittmotor-1-4-NEU_W0QQitemZ160382401978QQcmdZViewItemQQptZMotoren_Getriebe?hash=item2557893dba#ht_3281wt_912>
> Also the price can't be beaten at 9,90 euros for 3 units! what do you think?
>
> Hi Alfredo;
>
> If those are meant to couple a motor to a leadscrew, I don't think much
> of them. Unless your alignment is absolutely perfect, a solid coupling
> like that can break the end off your motor, or the stem off your
> leadscrew. What you want for a situation like that is some kind of
> flexible coupling, which will allow for some imprecision in the
> positioning of the two shafts being joined. There are several basic
> designs for this sort of thing; such as the "Lovejoy" type, which has a
> pronged head for each shaft and a rubber "spider" that fits in between
> them, or one that has a helical slot cut in the middle, which acts like
> a spring, or one that has metal ends but a solid rubber center portion.
> The Taig mills I sell have metal cylinders on the end of the motors and
> leadscrews, which are bored with four facing holes with stiff nylon
> tubes making the connection. Any of these solutions would be better
> than what you're looking at on Ebay.
>
> Also, the simple set-screw attachment will tend to give you problems
> over time. A better design is the clamp-type connection, which uses a
> screw to compress the split end of the coupling over the shaft. This is
> less likely to loosen, and if it does, it won't make a gouge in your
> shaft that makes the coupling very difficult to remove. Yes, you can
> save some money going with those cheap solid couplings, but you'd be
> setting yourself up for losing a lot more down the line, not to mention
> the frustration factor of ruining parts and having to tear your machine
> apart to repair it and wait for parts to arrive before you can get back
> to work. I'm not sure who sells couplings in Europe, but I'm sure you
> can find some like this:
>
> http://www.anaheimautomation.com/products/coupling/flexible-coupling.php?tID=114&pt=t&cID=32
>
> Good luck;
>
> Andrew Werby
> www.computersculpture.com
>
>
> ------------------------------------
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., timg@...
> Moderator: pentam@... indigo_red@... davemucha@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
> Yahoo! Groups Links
>
>
>
>

--
-----------------------------------------------------------------------------
eStore: http://www.homanndesigns.com/store
Web : http://www.homanndesigns.com ModIO - Modbus Interface Unit
email : peter@... DigiSpeed - Isolated 10Vdc I/F
Phone : +61 421 601 665 TurboTaig - Taig Mill Upgrade board