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

Goto
http://www.grizzly.com
Search for a G3102


This is a newer version.

There are others that I liked better called an A1S style..
Griz has quit carrying these but they are available from other
sources. The Griz Model numbers were 1004 and 1008 with the 1008
having power feed.

I think the Gem 500 is a small knee mill also but am not sure about
that.


Also available on the used market are the Clausing 85xx series and a
Rockwell that I don't know the model number of.

Garry


To: CAD_CAM_EDM_DRO@yahoogroups.com
From: Bill Vance <ccq@...>
Date sent: Fri, 8 Nov 2002 22:41:01 -0800 (PST)
Subject: Re: [CAD_CAM_EDM_DRO] Re: Beginner's Mill/Drill to
CNC conversion questions
Send reply to: CAD_CAM_EDM_DRO@yahoogroups.com

> 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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> 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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>
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