On Fri, 18 Apr 2008, Kirk Wallace wrote:
Date: Fri, 18 Apr 2008 21:09:31 -0700
From: Kirk Wallace [EMAIL PROTECTED]
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: Re: [Emc-users
Sorry, didn't mean to step on toes. The writer of that portion of the
wiki seemed to be doing OK until they got
to the part about the osc and hunting of servos.
Dave
On Apr 19, 2008, at 7:01 AM, Kirk Wallace wrote:
On Fri, 2008-04-18 at 22:15 -0700, Dave Engvall wrote:
On Apr 18, 2008, at
On Sat, 2008-04-19 at 09:16 -0700, Dave Engvall wrote:
Sorry, didn't mean to step on toes. The writer of that portion of the
wiki seemed to be doing OK until they got
to the part about the osc and hunting of servos.
Dave
My toes are happy. Your comment pointed out that there might have
On Thu, 2008-04-17 at 19:35 -0400, John Kasunich wrote:
... snip
That seems rather low, but making accurate resistance measurements under
an ohm or two with a regular meter is an exercise in futility anyway. I
don't know your general level of electronics expertise, nor the
equipment that you
Kirk Wallace wrote:
I mean that when the motor is commanded to take a step the shaft will
try its best to reach the new step, overshoot and then settle down. If
this over shoot is large enough, it might cause the cutter to cut too
deep for an instant. At moderate speeds, I suspect this isn't
On Thu, 2008-04-17 at 19:35 -0400, John Kasunich wrote:
... snip
If you
have a bench power supply with constant current mode, put a known
current (an amp or so) through a winding and measure the voltage drop.
Ohms law gives you the resistance, and as long as you make the voltage
measurements
On Fri, 2008-04-18 at 12:31 -0700, Kirk Wallace wrote:
... snip
steps I get .001 increments, but I had at least .0005 before. The
machine shudders at low speed now. I am going to try half stepping to
see what happens.
Half stepping or type 9 seems to work well. I get .0005 increments and
On Fri, 2008-04-18 at 22:13 -0500, Jon Elson wrote:
... snip
No, I think I got your point exactly, and I don't think steppers
have a really good answer for this. You can't split a step, or
tell it how long to take to get from one step to the next. When
the step command is given, it goes
On Apr 18, 2008, at 9:09 PM, Kirk Wallace wrote:
On Fri, 2008-04-18 at 22:13 -0500, Jon Elson wrote:
... snip
No, I think I got your point exactly, and I don't think steppers
have a really good answer for this. You can't split a step, or
tell it how long to take to get from one step to the
On Tue, 2008-04-15 at 20:42 -0700, Kirk Wallace wrote:
I am losing patience with the Bandit on my Shizuoka mill, so I am
...snip
touch off after powering up?
It's time to hit the books, but any advise is appreciated.
Here is what I have reverse engineered so far:
On Wed, 2008-04-16 at 21:37 -0400, John Kasunich wrote:
... snip
It sure looks like a unipolar drive to me. They are probably doing
half-stepping, which would give you the counts per inch that you think
you have.
Power is applied to the two center taps, thru two of the transistors
which
On Thu, Apr 17, 2008 at 01:14:37PM -0700, Kirk Wallace wrote:
http://www.wallacecompany.com/machine_shop/Shizuoka/1-1a.jpg
While it's out I'd meter those 220? ohm carbon composition resistors
surrounded by discolored circuit board. Heat is their enemy and
causes their values to drift
My HobbyCNC board says it is a Unipolar Chopper Control
It does 1/2, 1/4, 1/8, 1/16 microstepping. Uses 6 wire (2 common)
steppers.
C
--- Chris Radek [EMAIL PROTECTED] wrote:
On Thu, Apr 17, 2008 at 01:14:37PM -0700, Kirk Wallace wrote:
On Thu, 2008-04-17 at 14:30 -0700, Curtis W. Moore wrote:
My HobbyCNC board says it is a Unipolar Chopper Control
It does 1/2, 1/4, 1/8, 1/16 microstepping. Uses 6 wire (2 common)
steppers.
C
Thanks Curtis. Thats looks close. Too bad it has a 3 Amp max. I need
around 8 Amps with slightly
Kirk Wallace wrote:
On Thu, 2008-04-17 at 14:30 -0700, Curtis W. Moore wrote:
My HobbyCNC board says it is a Unipolar Chopper Control
It does 1/2, 1/4, 1/8, 1/16 microstepping. Uses 6 wire (2 common)
steppers.
C
Thanks Curtis. Thats looks close. Too bad it has a 3 Amp max. I need
around
On Thu, 2008-04-17 at 18:21 -0400, John Kasunich wrote:
Kirk Wallace wrote:
On Thu, 2008-04-17 at 14:30 -0700, Curtis W. Moore wrote:
My HobbyCNC board says it is a Unipolar Chopper Control
It does 1/2, 1/4, 1/8, 1/16 microstepping. Uses 6 wire (2 common)
steppers.
C
Thanks
Kirk Wallace wrote:
On Thu, 2008-04-17 at 18:21 -0400, John Kasunich wrote:
Do you know your motor's rated current and voltage (not supply voltage,
winding voltage, determined by multiplying the rated winding current by
the winding resistance).
There is no data attached to the motors. I
Kirk Wallace wrote:
I scoped the driver board inputs again and corrected my signal diagram
on the schematic. The gray traces are the result of the coil input and
it's inhibit. I confirmed this with scoping the far side of the input
optocoupler. I played with the axis speed and noticed the
On Tue, Apr 15, 2008 at 08:42:44PM -0700, Kirk Wallace wrote:
The motors are not labeled and I don't know
how to determine the steps per revolution.
...
I suppose I can add an index disk and sensor.
Is that perhaps a simple way to determine the steps per revolution?
(Count the steps fed to
Controller (EMC)
emc-users@lists.sourceforge.net
Sent: Tuesday, April 15, 2008 10:42 PM
Subject: [Emc-users] Bandit Steppers
I am losing patience with the Bandit on my Shizuoka mill, so I am
thinking of converting to EMC2 sooner than later. I would like to save
the stepper drivers but they look
At 10:42 PM 4/15/2008, you wrote:
I am losing patience with the Bandit on my Shizuoka mill, so I am
thinking of converting to EMC2 sooner than later. I would like to save
the stepper drivers but they look like they might have a proprietary
integration with the controller. The drives have four
On Wed, 2008-04-16 at 17:23 +1000, Erik Christiansen wrote:
On Tue, Apr 15, 2008 at 08:42:44PM -0700, Kirk Wallace wrote:
The motors are not labeled and I don't know
how to determine the steps per revolution.
...
I suppose I can add an index disk and sensor.
Is that perhaps a simple
Kirk Wallace wrote:
Thanks for your reply, Erik. I was wondering if there was a way to
figure out the steps per revolution with the motors disconnected, but
it's probably not important, because I can adjust settings after I get
the motors working. Although, it would be nice to know to figure
On Wed, 2008-04-16 at 07:00 -0500, Andre' Blanchard wrote:
... snip
Step direction to quadrature conversion can be done, not all that much of a
circuit needed really.
http://www.cnczone.com/forums/showthread.php?t=12066
__
Andre' B. Clear Lake, Wi.
I tried to see what the driver
Kirk Wallace wrote:
I am losing patience with the Bandit on my Shizuoka mill, so I am
thinking of converting to EMC2 sooner than later. I would like to save
the stepper drivers but they look like they might have a proprietary
integration with the controller. The drives have four inputs that
On Wed, 2008-04-16 at 12:27 -0400, John Kasunich wrote:
Kirk Wallace wrote:
Thanks for your reply, Erik. I was wondering if there was a way to
figure out the steps per revolution with the motors disconnected, but
it's probably not important, because I can adjust settings after I get
If you actually have access to all 4 coils - then I would use types 9 or
10. This would be half stepping and give you 2000 steps per inch.
(.0005 per step) 200*2*5.
at a normal base period of 5 - you could get (without using
doublestep) 300ipm easy. Not that your machine would actually
On Tue, 2008-04-15 at 20:42 -0700, Kirk Wallace wrote:
... snip
The drives have four inputs that appear
to take in steps as quadrature signals plus their complements; QB,
QA, /QB, /QA.
QB ___|```|___|```|_
QA _|```|___|```|___
/QB ```|___|```|___|`
/QA `|___|```|___|```
I scoped out
On Wed, 2008-04-16 at 16:07 -0500, sam sokolik wrote:
If you actually have access to all 4 coils - then I would use types 9
or 10. This would be half stepping and give you 2000 steps per inch.
(.0005 per step) 200*2*5.
at a normal base period of 5 - you could get (without using
On Wed, 2008-04-16 at 16:14 -0700, Kirk Wallace wrote:
On Tue, 2008-04-15 at 20:42 -0700, Kirk Wallace wrote:
... snip
I am wondering if this is just a simple H-bridge with current limit? If
anyone has more information on this drive, I would appreciate hearing
it.
Looking more closely at
Kirk Wallace wrote:
On Wed, 2008-04-16 at 16:14 -0700, Kirk Wallace wrote:
On Tue, 2008-04-15 at 20:42 -0700, Kirk Wallace wrote:
... snip
I am wondering if this is just a simple H-bridge with current limit? If
anyone has more information on this drive, I would appreciate hearing
it.
Kirk Wallace wrote:
The IA and IB sink the LED's on two optocoupler inputs each. The high
side of the LED's is driven by the Q and /Q quadrature signals. I am
guessing this forms a NAND function or an Inhibit? I wonder if the
inhibits are needed to prevent shoot-through? If that is the case
I am losing patience with the Bandit on my Shizuoka mill, so I am
thinking of converting to EMC2 sooner than later. I would like to save
the stepper drivers but they look like they might have a proprietary
integration with the controller. The drives have four inputs that appear
to take in steps as
On Tue, 2008-04-15 at 20:42 -0700, Kirk Wallace wrote:
... snip
I seem to recall the Geckos had a non-adjustable I in its PID tuning?
... snip
Oops. Thats for their DC drives. (Dooh)
--
Kirk Wallace (California, USA
http://www.wallacecompany.com/machine_shop/
Hardinge HNC lathe,
Bridgeport
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