Re: Some tecnical questions...

For most steper motors you can find a torque curve showing the available
torque at different step rates. Depending on your setup you probably won't
be able to get up to speeds at which the torque is at much less than 10% of
max. As an example, given your objective, a 200-step per revolution motor
would require 200,000 steps per minute, or 3333 full steps per second. From
the charts I've seen you probably could do that with good drivers and
appropriate microstepping. To be sure you have to know how much friction is
in your machine.
--
Phil Mattison
http://www.ohmikron.com/
Motors::Drivers::Controllers::Software

----- Original Message -----
From: Maxi Bertotto <tiwanacote@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, April 04, 2008 6:41 PM
Subject: [CAD_CAM_EDM_DRO] Some tecnical questions...


Hi!!! may be you can give me a hand.. :)

1) I`m making a 5 axis mill for work soft materials. I`m planing the
machine with a 10mm/turn screw and 2000microsteps/turn configuration stepper
motor. Do you think that is posible to get 10000mm/minute using a Gecko
driver (Or in other words: 1000 RPM in a stepper motor) ??? Which percentage
from the holding torque you think I woul use at 1000RPM - In an optimized
Sanyo-Denky motor?

2) I will use 5 steppers with 4amp/fase (Especificated in serial
conection - 4 cables) and 60V. The power supply current is: 5(motors) x
4(amp/fase) x 0,7071(Sin-Cos) x 2(Fases) = 28 Amp ????

Regards!
Tiwanacote


turbulatordude <dave_mucha@...> escribió:
There are some spray waxes that you can use for that.

Dave

--- In CAD_CAM_EDM_DRO@yahoogroups.com, gary <garyclick@...> wrote:
>
> Suggest that you consider painting the screw with a coat of enamel
> before casting the nut. Coat the outside of the painted screw with
the
> mold release and after removing the cast nut clean off the paint.
This
> should give enought clearance for the nut to operate.
>
> gary
>
> Mike Pogue wrote:
>
> > I cast some bearings around some socket head shoulder screws this
way...
> > They seemed to work OK, although it was a bit messy. The bearings
ended
> > up being quite tight.
> >
> > I used West Systems Epoxy (105/205) with 423 graphite powder,
> > and a MS122AD PTFE release agent. I tried several ratios
> > of graphite, and they all seemed to work pretty much the same.
> >
> > I thought about also casting a zero backlash feednut, but I
figured
> > that the natural small tolerances in the threads (I'm not using
> > a precision leadscrew) would result in too much binding.
> >
> > HTH,
> > Mike
> >
> > Jon Elson wrote:
> > > efraimbarkbit wrote:
> > >
> > >>What about making a batch out of: quality epoxy resin, graphite
powder
> > >>and atomized (at least very fine!)PTFE? Any ideas on
proportions etc.?
> > >>I can get all of the above within reasonable financial limits,
and
> > >>could do a trial run of let's say 10 batches for making
zerobacklash
> > >>feednuts. It should be possible to make something similar to
> > >>Mogliceputty (or injectable Moglice)
> > >
> > > Graphite can be quite abrasive, depends on how it is made.
> > > Moglice has Molybdenum diSulfide, not graphite, as the
> > > lubricating element.
> > >
> > > Jon
> > >
> >
> >
>
>
>
> [Non-text portions of this message have been removed]
>






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