Re: [CAD_CAM_EDM_DRO] Doesnt ANYONE have this drawn up??? was: John's CNC plans???

My pleasure. Sorry things aren't better organized. (Thank Bill for
them being as good as they are because I gave him crude drawings...)
I've got a drawing and pictures for the X and Y drives on the mill.
They might be more helpful than what I've shared thus far. It will be
Monday until I can get around to sharing those, provided Bill can draft
my sketches into something more legible.

Kim

On Fri, 2003-08-15 at 04:34, Vince Negrete wrote:
> Jon and Kim, I will check and recheck both theories with regard to my
> Old-Dog of a Mill and see if I can use existing stuff or need to modify with
> a diff. bearing assy to get that ballscrew held firm. Definitely in the
> right direction (with your help), and much thanks to the both of you. Thank
> you Kim for the bearing Part number. Might be worth picking one up to see
> if it would be a more relyable fit than using the original stuff.. I have
> to compare that also to the fact that I only have ONE mill and cant do the
> Milling / Modifying of its own parts unless I want to duplicate the parts
> and modify the duplicates... That would be a job... :) But might just be
> a necessary thing to do.
> I'm glad that I now have options that didnt cost me, for Funky Plans that
> might not have done me any good... :)
>
> Thanks Friends!!!!!
>
> Vince
>
>
> ----- Original Message -----
> From: "Jon Elson" <elson@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Thursday, August 14, 2003 10:12 PM
> Subject: Re: [CAD_CAM_EDM_DRO] Doesnt ANYONE have this drawn up??? was:
> John's CNC plans???
>
>
> >
> >
> > Kim Lux wrote:
> >
> > >I highly disagree with using existing parts.
> > >
> > >First of all, the bearings used on the ends of ACME screws generally
> > >aren't the sort that would be used on a zero backlash ballscrew setup.
> > >The runout, etc. on them is not suitable. In my opinion they need to be
> > >replaced with a more suitable bearing, like a 7302, a precision angular
> > >contact bearing.
> > >
> > >Once you realize the need to replace those bearings, the existing
> > >bearing holders are useless. Making new bearing mounts also allows the
> > >motor to mounted for direct drive.
> > >
> > >
> > >
> > The XF-12 bearings in a REAL Bridgeport screw mounting bracket
> > (Y axis, and the left X axis) are a matched set of spacer-preloaded
> > bearings, and I have tested them, and found them to be BETTER at
> > axially constraining the leadscrew than the angular-contact bearing pair
> > in my high-precision CNC axis drives. (Due to the size of the ballscrews
> > I used, I couldn't use the original bearings.) But, there was NOTHING
> > wrong with them, and they would be fine for a ballscrew installation.
> > Now, I can't vouch for the bearings in a Rong-Fu or some low-budget
> > bridgeport clone from China. Undoubtedly, they are not of the same
> > quality.
> >
> > >Some other thoughts:
> > >
> > >a) convert as large a machine as you can. The speed with which things
> > >can be done on a CNC machine are only limited by the cutting power, so
> > >bigger = faster.
> > >
> > >
> > I wholeheartedly agree with this, but not only for the power reason.
> > A larger machine is almost certainly stiffer, and therefore can be more
> > accurate. Also, the larger machine can accept jobs that the smaller
> machine
> > has to do in several setups, thereby compromising accuracy.
> >
> > >b) don't overlook coolant and chip handling. Coolant is an absolute
> > >necessity on these machines because the cutting rates are easily
> > >adjusted via feed override to be high. Chips will accumulate faster
> > >than you can imagine when running multiple parts and high cutting
> > >speeds.
> > >
> > >
> > Yup, this is also true. And, I always want to point out that keeping the
> > workpiece cool can improve accuracy, and prevent the dreaded
> > "ball up" of aluminum on endmills.
> >
> > Jon
> >
> >
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>
> 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
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--
Kim Lux <lux@...>