On Sunday 19 September 2021 20:12:01 Chris Albertson wrote:
> Is the PID controller running on the PC under LCNC or is this an
> external PID controller you built?
>
The pid is the stock lcnc pid,
> What are the numbers, the loop period, motor speed and numer of
> encoder lines. and so on?
from
Is the PID controller running on the PC under LCNC or is this an external
PID controller you built?
What are the numbers, the loop period, motor speed and numer of encoder
lines. and so on?
I don't think the fact that there is a worm gear matters. The problem, I
bet is the large inertia of the
Greetings all;
As most of you know, I built a servo from scratch for a BS-1.
But I am not at all happy with its performance.
It is a motor with a worm output, driving the worm of the bs-1. And it
has an A/B quad encoder in it.
But I must rather severely limit its run speed because the PID
I find the pendant great for that. The only issue has been with setting tool
height as selecting and moving an axis with the pendant doesn't change the
buttons on the AXIS screen. So I sneak up to the right hight but perhaps X is
still selected for the keyboard jog buttons. Then I click on
Yes.. I agree. Though my favorite thing to setup on a linuxcnc machine
is an encoder wheel for jogging and overrides... What I use the most is
maximum velocity over ride.. allows you to sneak up on part...
On Sun, Sep 19, 2021, 2:53 PM John Dammeyer wrote:
> Hi Sam,
> I must admit there's
I have a shunt circuit on the 105VDC supply for that. I could build up
another one of those PC boards to do it for a higher voltage supply. But is it
all worth it for one motor that does not match the data sheet winding
resistance and shows up with problems.
John
> -Original
Hi Sam,
I must admit there's a certain amount of fear every time I press the go button
for a CNC program. Especially when I started mucking around with tool #'s and
offsets. My hand now overs over ESTOP when I press start. Watching a tool
that appears too low scream over to the part held in
Is really a pain to debug such issues, i have an old machine with the same
motors connected to gecko 340 (but I have to remove the multiplier), us
digital encoders wont work without the caps.
I hope you can resolve this issue soon, i pull my hair when things like
this show up!
Go John!
El dom, 19
John Figie
On Sun, Sep 19, 2021 at 2:07 PM John Dammeyer
wrote:
>
>
> That's the question. One possibility to try is to grab 110VAC line
> voltage. Put a bridge and caps on it and drive that motor with more than
> the 105VDC power supply. I'll have to check if my transistors are rated
> for
Lol.. I certainly love the electrics part more than the machining most of
the time...
On Sun, Sep 19, 2021, 2:07 PM John Dammeyer wrote:
> Hi Sam,
> See below.
> > From: Sam Sokolik [mailto:samco...@gmail.com]
> >
> > I have never used servo drives that close the loop.. I have always had
> >
Hi Sam,
See below.
> From: Sam Sokolik [mailto:samco...@gmail.com]
>
> I have never used servo drives that close the loop.. I have always had
> great luck with normal closed loop within linuxcnc. (cheap used amc
> drives)
>
> (Actually - I take that back - I have used the stmbl drives. so far
I have never used servo drives that close the loop.. I have always had
great luck with normal closed loop within linuxcnc. (cheap used amc
drives)
(Actually - I take that back - I have used the stmbl drives. so far only
for a spindle..)
This is of course using mesa analog interface hardware.
John Figie
I forgot to post more details about the Hedenhain TNC 151 interpolator.
> http://machineability.com/Bridgeport_series_II.html
>
> On the other hand my Bridgeport series II Interact conversion which had a
> Heidenhain TNC seemed to have some comparators and logic to do
> interpolation
I agree with Eric, Many Sin - Cos encoders like SICK and Heidenhain output
a DC reference voltage on the A- and B- signals and only the A+ and B+
actually change around the reference. Some encoders like Kubler I think
have true complementary differential outputs. In either case the
differential
I have found a manual online. It is a fanuc encoder on the top of a spindle
motor.
I don't seee any trim pots inside the box. Just 5 jumpers.
1is it for 90 or 270 deg for reference.
2nd is high or low impedence input. (not sure what this does)
3-5 is interpolation amount (5x vs 10x) and output
Hi Rick,
It may also have something to do with the DC Servo drive electronics. Although
it's differential encoder signalling the design may have internal issues that
are somewhat corrected by the Henk Olsson module. I had both a small
electrolytic and ceramic capacitors right by the US
us digital encoders with a capacitor across dc+and- works without a
fault
El dom, 19 sept 2021 a las 2:49, John Dammeyer ()
escribió:
> Over 10 years ago I bought two of these for the XY axis of the mill.
>
>
I don't think that's true that they have to be compliments. There probably
is a way to adjust the levels like I mentioned in my previous email. Is the
manual online, or did you just get a paper copy? I wonder if it's an issue
with the signals not being +/- with respect to ground. Is it a
Ok after thinking about it more, the interpolate is expecting that the
incoming sin/cos signals a,a* are actual inverse values. however this
encoder is single ended, it just has a and b signals. the a* and b* signals
are a sort of reference voltage and never change. I'll experiment with it
some
On 9/19/21 00:44, John Dammeyer wrote:
Over 10 years ago I bought two of these for the XY axis of the mill.
https://www.automationtechnologiesinc.com/products-page/dc-servo-motor/nema34-1125ozin-dual-shaft-servo-motor
One of the things that showed up right away was that with identical drives
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