Re: [CAD_CAM_EDM_DRO] Shafting

Hi JJ,
my first XY 3 axis mill used unsupported 28" long x .750" round linear
shafting (Thomson) and it is not strong. The machine frame is .750" thick
mike plate aluminum. I use a Rockwell trim router for a spindle and it bobs
up and down when it is does a rapid traverse. You can easily deflect the
gantry or carriage more than a quarter inch when they are midspan on the
ways. I work around it by keeping my feedrate on the finish pass really low.
I'd wouldn't do an unsupported design again without first proving the
rigidity perfomance. The linear salesman suggested I go with profile ways
mounted to a frame but I was real green and based my design on an old PCB
router which used unsupported round linear shafting. I found out later the
hard way, that router exploits the unsupported shaft design probably because
it's feed rate and traverse speed is so low.
HTH
cheers,
Denis

On Friday 08 November 2002 15:51, you wrote:
> What about using supported shafts with open linear bearings? You could
> use a lot smaller shafts.
>
> Regards,
> JJ
>
> Be Kind, Be Careful, Be Yourself
>
> > -----Original Message-----
> > From: JanRwl@... [mailto:JanRwl@...]
> > Sent: Friday, November 08, 2002 5:46 PM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: Re: [CAD_CAM_EDM_DRO] Shafting
> >
> >
> > In a message dated 11/8/2002 4:43:41 PM Central Standard
> > Time, JanRwl@...
> >
> > writes:
> > > 3/5 hp 400 Hz
> >
> > Correction! 3.5 hp, 400 Hz
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> > 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@...
> > Moderator: jmelson@... timg@...
> > [Moderator]
> > 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
>
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
>
> 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@...
> Moderator: jmelson@... timg@... [Moderator]
> 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
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/