Re: [CAD_CAM_EDM_DRO] Doesnt ANYONE have this drawn up??? was:

Hi guys;

Once again, are these .dxf type files? If so I can use them, if not, I may need
to view them with something else, not sure what. Haven't seen what you put out
so far.....

Bill Vance

On Fri Aug 15 07:17:35 2003 Kim Lux wrote:

>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
>> >
>> >
>> > Addresses:
>> > FAQ: http://www.ktmarketing.com/faq.html
>> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
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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
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>> >
>> > 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
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>> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., timg@...
>> Moderator: pentam@... indigo_red@... [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
>>
>>
>>
>> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>--
>Kim Lux <lux@...>
>
>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@... [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
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

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