On Friday 11 September 2009, Ian R Upton wrote:
>Gentlefolk,
>
>Thanks for all the comments and suggestions.
>
>Back looking at the basics. How do I know the motor is 50 steps/rev???
>
>The motor is an Epson EM-257 which I have not been able to find much
>about on the Internet.
>
>I held the shaft
On Fri, Sep 11, 2009 at 01:43:46PM +0100, Andy Pugh wrote:
> 2009/9/11 Steve Stallings :
> > If you turn them by hand, you will feel the 50
> > magnetic detents associated with the 50 poles.
>
> Presumably because the poles retain the magnetic polarity from last
> time they were energised?
The so
The most common style of stepper motors used today have
permanent magnets. These magnets are always "pulling" and
will try to orient the rotor to one of the 50 pole positions
even when the stator coils are not energized.
When the two coils of the stator are energized, the poles
of the rotor orien
2009/9/11 Steve Stallings :
>
> The most common stepper motors are 50 pole, which
> results in 200 steps per revolution when driven by the
> 4 possible combinations of magnetic polarity of the 2
> coils. If you turn them by hand, you will feel the 50
> magnetic detents associated with the 50 poles.
A 200 step motor is a good thing if you have a five pitch lead screw
(like on a Bridgeport milling machine) and you want each step to be a
thousandth of an inch. That's particularly true if you were back in the
days of paper tape and minimal computing ability.
Ken
Ian R Upton wrote:
> Gentlefo
nal Message-
> From: Ian R Upton [mailto:upt...@pacific.net.au]
> Sent: Friday, September 11, 2009 3:36 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Stepper motor setup and test
>
> Gentlefolk,
>
> I added a pointer to the shaft of the motor (like
Gentlefolk,
I added a pointer to the shaft of the motor (like a clock hand) so I
could see what the motor was doing.
I then set the current and acceleration values.
I then ran a series of tests at various steps/rev and fiddled the
velocity until I could get stable performance (consistent count
[mailto:upt...@pacific.net.au]
> Sent: Friday, 11 September 2009 4:35 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Stepper motor setup and test
>
> Gentlefolk,
>
> Thanks for all the comments and suggestions.
>
> Back looking at the basics. How do I know
- "Ian R Upton" a écrit :
> Gentlefolk,
>
> Thanks for all the comments and suggestions.
>
> Back looking at the basics. How do I know the motor is 50
> steps/rev???
>
> The motor is an Epson EM-257 which I have not been able to find much
> about on the Internet.
>
> I held the shaft of
Gentlefolk,
Thanks for all the comments and suggestions.
Back looking at the basics. How do I know the motor is 50 steps/rev???
The motor is an Epson EM-257 which I have not been able to find much
about on the Internet.
I held the shaft of the motor and rotated it carefully. 50 "steps"
(harde
- "Ian R Upton" a écrit :
> Microstep = 1:1, (driver pwb also set to 1:1)
>
Something I noticed from my own system, is that I have far better performances
in max speed and acceleration when using half-steping on the driver than
full-step.
I've read stories like this on this list too.
Hello Ian,
you didn't state which version of stepconf you are unsing. I spent months
this winter and spring with pretty much the same behaviour you experienced,
and it turned out to be a bug in stepconf, but only when using the "Test
axis" feature. The problem was that the spaces between pulses
On Thu, 2009-09-10 at 11:23 +0100, Andy Pugh wrote:
> Or (it just occurs to me), you might be the only person ever to use a
> 50-step motor, and everyone else has always used 200 step ones and not
> noticed that the steps/rev setting is ignored. Seems unlikely, though.
I saw a small hexapod in Ger
You might have a 1.8° per step motor which is more common. At least the math
adds up to
that. If you change your steps/rev to 200 I bet your right on.
John
On 10 Sep 2009 at 20:00, Ian R Upton wrote:
> Thanks for the response.
>
> The erratic behaviour appears to be a combination of motor cur
2009/9/10 Ian R Upton :
> Therefore I would expect 50 steps to move the motor shaft 1 rev for a
> jog step of 1.00MM.
>
> But no! I need to have a jog step of 4.00MM to get the motor to move 1 rev.
Wierd. I suspect that something is microstepping somwhere despite
being told not to, or that there
Thanks for the response.
The erratic behaviour appears to be a combination of motor current, step
velocity and stop/start delays.
I read the documentation again..
A lot of fiddling and it is now sitting there repeatedly performing the
same step count.
This stability lets me look at th
2009/9/9 Ian R Upton :
> I have a number of issues but the main one would be inconsistent stepping.
Have you done a latency test, and is the base period set to match?
> What should I get from a "click" on the jog button I would think ONE
> step pulse.
No, you will get enough pulses to move
Gentle folk,
I am a newcomer to the world of CNC and EMC. I have a background in
computers and data communications.
I have linux 6 and the associated EMC software. Connection to the
motor/driver is via the printer parallel port.
I have been constructing the hardware side of a small router and
18 matches
Mail list logo
