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

Yo Garry;

I've never seen one of those benchtop knee mills, got any more info, websites,
etc?

Bill

On Fri Nov 8 21:37:52 2002, Garry & Maxine Foster, <garry.foster@...> wrote:

>> 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.
>> >
>> > __________________________________________________
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>>
>>
>>
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>
>
>
>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/
>
>
>

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