Tuning question, stepper motor mill

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22 Feb 2019 14:05 - 22 Feb 2019 14:10 #126909 by Leon82
I have my dirhold and dirsetup at 60000. I inflated my max jitter numbers initially.

Velocity was set at 2 in per sec and it stalled out so I dropped it to 1.75 and it runs but sounds like it may be missing a couple steps. On wheezy it's fine but I'm testing out stretch. The jitters is around 20k for both on stretch

I could increase voltage (40v Currently) on the nema 23 motors also

I would be happy with 100 ipm max velocity.


May get a mesa card but want to try and tweak this first.
Last edit: 22 Feb 2019 14:10 by Leon82.

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22 Feb 2019 14:13 #126912 by pl7i92
can you tell Here what Board are you using
100ipm on a parporrt is quite easy
that is 40mm/sec

and 40 VEL and 250 ACC is a Standard that can be done by a simple TB6560 at 100000 latency

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22 Feb 2019 14:54 #126920 by Leon82
It's a sainsmart breakout board with gecko 201s

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22 Feb 2019 17:07 #126922 by Leon82
These are the hal values

setp stepgen.0.steplen 1
setp stepgen.0.stepspace 0
setp stepgen.0.dirhold 60000
setp stepgen.0.dirsetup 60000

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22 Feb 2019 19:02 #126932 by pl7i92
is it the one i use
here is my channel
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22 Feb 2019 20:21 #126950 by Todd Zuercher

These are the hal values

setp stepgen.0.steplen 1
setp stepgen.0.stepspace 0
setp stepgen.0.dirhold 60000
setp stepgen.0.dirsetup 60000


There is one more pertinant thing needed from your hal file. From the above numbers you must be using the reset funtion of the parallel port to get a full step/ base-thread cycle. We need to see what that reset time is because it becomes your step length time. Look for a line like:
setp parport.0.reset-time ...

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22 Feb 2019 20:39 - 22 Feb 2019 21:35 #126957 by Leon82

These are the hal values

setp stepgen.0.steplen 1
setp stepgen.0.stepspace 0
setp stepgen.0.dirhold 60000
setp stepgen.0.dirsetup 60000


There is one more pertinant thing needed from your hal file. From the above numbers you must be using the reset funtion of the parallel port to get a full step/ base-thread cycle. We need to see what that reset time is because it becomes your step length time. Look for a line like:
setp parport.0.reset-time ...

it's 5000
Last edit: 22 Feb 2019 21:35 by Leon82.

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22 Feb 2019 21:35 #126959 by Leon82
It's 5000 for the port reset

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22 Feb 2019 22:59 #126962 by Leon82
I set the reset to 35000 and it sounds good.

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23 Feb 2019 02:27 #126980 by Todd Zuercher
35000 is pretty long for a reset time, I would suggest not using a rest time longer than half your base-thread time. if you have trouble at that speed,either try inverting your step signal or don't use the reset feature.
The reason being the reset feature holds the real time system hostage for the amount of time it counts down and if your computer is twiddling it thumbs for more than half the time... you get the picture.
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