RE: new listmember

[Kurtis Martineau <klmartineau-at-shaw.ca>]

Tim,



> -----Original Message-----
> From: emc-at-nist.gov [emc-at-nist.gov]On Behalf Of Tim Goldstein
> Sent: Tuesday, July 02, 2002 12:40 PM
> To: Multiple recipients of list
> Subject: Re: new listmember
>
>
>
> Welcome to the list. I personally have no experience with the Rong-Fu, but
> know that there are a number of list members that have them and like them.
> >From your background it sounds as if the only area you may have
> to stretch a
> little is electrical. Other than that you sound better equipped than most.
>
> Don't be afraid of getting a 3 phase machine. You can just
> connect them to a
> VFD that is drawing power from a single phase 220 line and they will run
> just as if you had 3 phase in the shop. Most VFD's do need to be downrated
> 50% for this type of use so if you have a 2 hp machine you will
> use a 4 or 5
> hp VFD. They do not change voltage though so you need to be sure
> the machine
> can run on 3 phase at the voltage of your single phase.

VFD's are not power supplies.  Nothing better for motor control, but I don't
think it is a good idea to use one as a power source for servo amps or any
equipment that may be removed underload.  (ie.. any control voltage power
supplies that come with the machine)

Some VFD's do change voltage or have a wide operating range.  (ie..120v
input  0-230v output, or 380v to 500v input range)


> I started with a Sherline with a Camtronics controller then moved up to a
> Shoptask with the same controller. I then upgraded to servos using Gecko
> G320 drives and now have a Bridgeport Series II using the Gecko
> servos drive
> and EMC. For heavy work there is no comparison between the small machines
> and a series II.
>
> Good luck and don't be shy about posting to the group.
>
> Tim
> [Denver, CO]
> http://www.KTMarketing.com/CNC.html
>
> ----- Original Message -----
> From: "Clarke Williams" <clarkewilliams-at-halcyon.com>
> To: "Multiple recipients of list" <emc-at-nist.gov>
> Sent: Tuesday, July 02, 2002 10:56 AM
> Subject: new listmember
>
>
> >
> > Hello all.  I just joined the list.  I'm interested in adapting
> a Rong-Fu
> > RF-45 mill-drill to CNC using the em.
> >
> > A little background on me:
> > Mechanical Engineer
> >
> > 20 yrs doing PCs and computer networks professionally
> >
> > I have a mild programming background.
> >
> > I am familiar with Linux.  I can re-compile a kernel.  Very
> familiar with
> > PC hardware at a low level (I worked at Compaq in Systems Engineering).
> >
> > I've never attempted anything like this before.
> >
> > Any feedback on the choice of the Rong-Fu RF-45 would be appreciated.  I
> > have *not* purchased the mill-drill yet.  What I am looking for is
> > milling/drilling performance as close to a Bridgeport Series 1
> as possible
> > that can be reasonably easily moved (I'm not in a permanent
> location yet)
> > and preferably uses 1 phase 220 -- 3-phase is simply not available at my
> > location.  If anyone has any info or feedback on the RF mill-drills or
> > other similar machines I would very much appreciate the feedback.
> >
> > Any other suggestions would be very welcome.
> >
> > Once I get the mill-drill CNC working I'd like to do similar
> with a small
> > 13x40 or 14x40 bench lathe.  Suggestions regarding these small lathes
> would
> > be welcome, too.
> >
> > My application is ultimately commercial (I have a transmission to 4x4
> > transfer case adapter designed as well as some other products),
> not hobby.
> >
> > Thanks all!
> >
> > Clarke Williams
> > <clarkewilliams-at-halcyon.com>
> > Coos Bay, OR
> > 541-266-0300
> >
> >
>
>
>