Re: mini-mill and motors

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Danny Miller <dannym@...> wrote:
>
> If you get a Geckodrive, the 48V Sun 25A supply is not only much more
> appropriate, it's actually almost the same price!
>
> ~$35 on eBay with shipping INCLUDED. Versus $20 from Allelectronics +
> shipping isn't much less, and I wouldn't even recommend that supply in
> the first place.
>
> Danny
>
> On 11/14/2011 8:03 PM, turbulatordude wrote:
> > Hi,
> >
> > first off, the mini-mill has a horrible design flaw. you cannot easily lube the ways on the longitudinal travel.
> > if your machine is getting tight at the ends, then the center is worn and the ends are not. that is a mechanical problem that motors might or might not solve.
> >
> > if you are open to driving the motors harder, then you do need to ditch the xylotex and put on something more robust.
> >
> > the geckos will run the machine better.
> > what I would offer is that you get the $20 power supply from allelectroncis and keep the control panel. remove it from the mini-mill and put it on a small table top router type of unit.
> >
> > Dave
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Chuck Merja"<chuckm@> wrote:
> >>
> >> WOW –My initialtion of the Xylotex thread was 3 minutes into Sunday the
> >> 13th, then I went to bed. Dave replied at 12:19, 16 minutes later. Then
> >> later Sunday AM, I sent the thread below (sent at 08:23 on Nov 13) as a
> >> reply to Dave's initial reply about the Xylotex power supply. Somehow it
> >> took 18 hours to hit the listserv and there had already been a lot of
> >> advice, so the question about steppers looks really out of context. Am I
> >> doin something wrong with my posts?
> >>
> >> Anyway, the motors on the minimill that is run by Xylotex whose power supply
> >> just went south are the Automation Direct units described below – they are
> >> about 2.25" square so I am thinking they are NEMA 23. They seem too weak
> >> for the minimill, as if I tighten the gib enough to have the center of
> >> travel reasonably tight I miss steps at the endpoints of travel, so I really
> >> only have about 5" of the "monster" 7" travel on this minimill. I've had
> >> the table off several times, thinking that I needed to do something
> >> mechanical to the ways/gib to make the table drag more uniform, and with
> >> power off I can turn the table to the full "X" range by hand, so I really
> >> think a little stronger steppers is what I'd like. So I'm wondering if a
> >> different controller (than the Xylotex) on these steppers would help or if I
> >> need different steppers. The X and Y screws are ACME 5/8 x 8 thread and I
> >> built a plastic antibacklash nut for X, that seems to work pretty well, but
> >> needs slightly more torque to turn (but I can still get "X" to both ends by
> >> hand with power off).
> >>
> >> And for the router, I'm thinking it would be something like a 12"x12 or
> >> maybe18" gantry type router – maybe a Rockcliff or something similar. I
> >> thot I'd use something like ½"-20 allthread to run the X/Y. Would the
> >> Xylotex run something like that or have I outgrown the Xylotex? I was
> >> hoping to use it (Xylotex) to run both for a while, until there was more
> >> demand for the technology, then we could justify separate controllers, but
> >> maybe I just need to build a totally separate unit/control.
> >>
> >> So many projects – so little time. I was "showing off" to the kids and we
> >> were making our first ever real part for one of our competition robots when
> >> the Xylotex power supply went south. The wind went out of the sails on this
> >> CNC project with that one :o((
> >>
> >> C
> >> first, changed the subject line. not about xylotex anymore
> >>
> >> if you have a decent control box. great. get more cables. do not try to
> >> switch them. only adds a weak spot, one that could blow out the driver. very
> >> risky.
> >>
> >> I would keep that control box, and start a new project for a new box.
> >> and, yes, if you feel your motors are under powered, there are options. a
> >> Gecko would be my recomendation. but which one ?
> >>
> >> first nema 23 ? 34?
> >> what voltage is your power supply ?
> >> what type of machine ?
> >>
> >> before anyone can offer a potential solution, we need the basics.
> >>
> >> Dave
> >>
> >> --- In CAD_CAM_EDM_DRO@yahoogroups.com
> >> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com> , "chuck"<chuckm@> wrote:
> >>> Thanks, a question about steppers... I have
> >>> Automation direct
> >>> Sure step
> >>> 1.8 deg/step
> >>> 276 ozin
> >>> 2.8amps
> >>> Would these fit your definition of "low voltage"? They seem too weak to
> >> me- I have to run pretty light gib pressure. If not, could u recommend
> >> steppers?
> >>> And one other question. I'm looking at making a wood, plastic, light metal
> >> router and am thinking that I'd like to use the same stepper drivers and
> >> computer - at least initially. So I might change motor cables between the
> >> two machines or even find a stack of db9 "AB" boxes. Any thots about that
> >> would be welcome.
> >>> Thx, C
> >>> Sent via my "ChuckBerry" by AT&T
> >>>
> >>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >
> >
> >
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