Re: [CAD_CAM_EDM_DRO] Re: Beginner's Mill/Drill to CNC conversion questions

>> Most would prefer this however there are some cavets to this.
> The dovetailed mill/Drills I know are nearly twice the price.
> The good, you can rise and lower the head without losing position. The
> bad, without the dovetail you can swing the head from one side to the
> other inbetween machining and gain a much larger machineable Area
> without reclamping. Can't do this with the tail. Personally I do not
> belive the added price would be justified, if I had the additional
> money for the dovetail version I would be spending it on a larger
> machine to start with.
>

Also you can buy a benchtop knee mill for less than the dove tail
mill drills.
They seem to be a better answer to me.

Garry

> >
> > 1. Once I purchase the Mill/Drill and computer, how
> > much more will it cost to convert to a 3 axis CNC?
> > 2. I would like a machine that will give me 0.001"
> > accuracy. Can I expect that from this type of a
> > setup?
>
> Yes Mill/Drills are capable of this acuracy.
> Most Drivers deliver resolutions higher then this.
> There is a very wide range of cost here depending on the
> performance you expect to get.
> The more you want to get involved in assembly of your drivers
> the more mony you can save, research and shop around.
> The Hardware to mount the motors and such you will be stuck with
> there are no vendors I know of that offer this.
> There are some Kits offering drivers motors and software.
> generaly anything less then $2000.- will likely not have powerful
> enough motors to get satisfactory speeds. You can always gear them
> down to get more torque but this will also reduce the speeds to move
> the axes. Between $2000-$5000 is what gets you into some respectable
> kits. The sky the limit here there are kits for more then $10000.- out
> there I have no Idea if they are any better, too much for me.
>
> > 3. Will I need to install ballscrews, or are they
> > just highly recommended?
>
> Highly recommended.
> Without Ballscrews your machine will have the same capability
> as a manual machine just cnc controlled.
> Dealing with backlash will be a pain, restricting to mostly
> conventional cutting.
> Acurate circle cutting one of the main benefits of cnc will
> not be nearly as acurate eaven with backlash compensation.
>
> > 4. Stepper or servo motors? and why?
>
> This is to complex of a question to answer here, there
> are many good webpages out there to explain the pos and cons.
> Very generalised a machine this type can be retrofitted
> with ether one and function very satisfactory.
> A suitable stepper setup will likely be a little cheaper.
>
> > 5. I am trying to get a mill/drill with a dovetail Z
> > axis. would it be more difficult to convert this type
> > mill?
>
> No most I know still have rack and pinion drive.
> This in any case is more difficult to archive backlash free
> opperation.
>
> >
> > I'm glad I've found this group. there seem to be very
> > knowledgable people here. I'm still reading through
> > the FAQs and Archives. any advice or tips you could
> > give me would be much appreciated. Thanks in advance.
> >
> > __________________________________________________
> > Do you Yahoo!?
> > U2 on LAUNCH - Exclusive greatest hits videos
> > http://launch.yahoo.com/u2
>
>
>
> 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/
>
>