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can linux cnc can cut a thread using only breakout board without using mesa card
- andypugh
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16 Jul 2019 16:30 #139576
by andypugh
A multimeter in diode testing mode should tell you which is the LED.
Then you can try driving that with 5mA or so, and see what the other pins do.
One of the little component testers might also be useful:
www.ebay.co.uk/itm/323851908270
(As a randomly chosen example, not as a specific recommendation)
Replied by andypugh on topic can linux cnc can cut a thread using only breakout board without using mesa card
I have already got some old photocopiers optocoupler switches but the problem is I can not figure out the pins of those switches.
any ideas?
A multimeter in diode testing mode should tell you which is the LED.
Then you can try driving that with 5mA or so, and see what the other pins do.
One of the little component testers might also be useful:
www.ebay.co.uk/itm/323851908270
(As a randomly chosen example, not as a specific recommendation)
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16 Jul 2019 16:38 #139579
by Dinuka_Shehan
Replied by Dinuka_Shehan on topic can linux cnc can cut a thread using only breakout board without using mesa card
max rpm should be 3000rpm
phase A and index pulse
can i add phase B to my system?
phase A and index pulse
can i add phase B to my system?
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16 Jul 2019 17:01 #139582
by andypugh
What is your actual base period? That will decide whether quadrature is possible.
You would also need another input pin, and an extra sensor.
Replied by andypugh on topic can linux cnc can cut a thread using only breakout board without using mesa card
max rpm should be 3000rpm
phase A and index pulse
can i add phase B to my system?
What is your actual base period? That will decide whether quadrature is possible.
You would also need another input pin, and an extra sensor.
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16 Jul 2019 20:50 #139598
by Dinuka_Shehan
Replied by Dinuka_Shehan on topic can linux cnc can cut a thread using only breakout board without using mesa card
Hi Andy,
I don’t remember the exact value right now.
Can you please explain me what is actual base period?
What is for (purpose)?
What are vital factors and limitations?
I’m excited to know.
I have little idea about latency test.
But base value always confuse me.
I don’t remember the exact value right now.
Can you please explain me what is actual base period?
What is for (purpose)?
What are vital factors and limitations?
I’m excited to know.
I have little idea about latency test.
But base value always confuse me.
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16 Jul 2019 21:00 - 17 Jul 2019 00:52 #139602
by andypugh
Replied by andypugh on topic can linux cnc can cut a thread using only breakout board without using mesa card
The base thread period is the period (in nanoseconds) at which the encoder counts will be sampled.
If the value is 20000 nS (20µS) then the sample frequency is 50kHz.
So, if the A / B transitions come more frequently than 50kHz you are likely to miss some of them.
If the value is 20000 nS (20µS) then the sample frequency is 50kHz.
So, if the A / B transitions come more frequently than 50kHz you are likely to miss some of them.
Last edit: 17 Jul 2019 00:52 by andypugh.
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16 Jul 2019 21:18 #139605
by Dinuka_Shehan
Replied by Dinuka_Shehan on topic can linux cnc can cut a thread using only breakout board without using mesa card
From where 50Hz came from?
I am currently install linux cnc to
Pentium 4 D processor 1Gb ram 128 onboard VGA included desktop pc.
What is the highest base thread value to perform threading precisely.
I think I should run latency test first.
But I think you will have a better solution!
Thank you for help you gave me so far and as well as other members
I am currently install linux cnc to
Pentium 4 D processor 1Gb ram 128 onboard VGA included desktop pc.
What is the highest base thread value to perform threading precisely.
I think I should run latency test first.
But I think you will have a better solution!
Thank you for help you gave me so far and as well as other members
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16 Jul 2019 22:19 #139621
by andypugh
50kHz = 1/20µS
Replied by andypugh on topic can linux cnc can cut a thread using only breakout board without using mesa card
From where 50Hz came from?
50kHz = 1/20µS
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16 Jul 2019 22:26 #139623
by tommylight
Replied by tommylight on topic can linux cnc can cut a thread using only breakout board without using mesa card
@Andy
There is 1 zero to many on the base timing.
@DinukaShehan
50kHz, not 50Hz. 50kHz is 50000Hz, or Hertz, or signal changes per second.
Regards,
There is 1 zero to many on the base timing.
@DinukaShehan
50kHz, not 50Hz. 50kHz is 50000Hz, or Hertz, or signal changes per second.
Regards,
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17 Jul 2019 07:45 #139673
by Dinuka_Shehan
Replied by Dinuka_Shehan on topic can linux cnc can cut a thread using only breakout board without using mesa card
I am currently install linux cnc to
Pentium 4 D processor 1Gb ram 128 onboard VGA included desktop pc.
What is the highest base thread value to perform threading precisely
what should be my base thrread value?
Pentium 4 D processor 1Gb ram 128 onboard VGA included desktop pc.
What is the highest base thread value to perform threading precisely
what should be my base thrread value?
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17 Jul 2019 07:53 #139674
by tommylight
Replied by tommylight on topic can linux cnc can cut a thread using only breakout board without using mesa card
Assuming you want to use parallel port , you need the RTAI version of the kernel for that computer, and if it is good as some Dell P4D i had you can safely use 50000 for the base thread.
Linuxcnc will let you know if the base thread is to fast, so start from that and if you do get real time errors, raise it a bit and test again
Linuxcnc will let you know if the base thread is to fast, so start from that and if you do get real time errors, raise it a bit and test again
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