mycnc:mycnc_pulse_width_setup
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mycnc:mycnc_pulse_width_setup [2019/04/17 12:50] – ivan | mycnc:mycnc_pulse_width_setup [2019/04/24 13:32] – ivan | ||
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- | -===== MyCNC Pulse Width Setup ====== | + | ===== MyCNC Pulse Width Setup ====== |
- | ==== MyCNC Pulse Width elements ==== | ||
*In myCNC software, navigate to **Settings** | *In myCNC software, navigate to **Settings** | ||
*Open the **Hardware** tab | *Open the **Hardware** tab | ||
Line 10: | Line 9: | ||
====Selecting the Appropriate Pulse Width for your motor==== | ====Selecting the Appropriate Pulse Width for your motor==== | ||
- | A common issue is selecting the appropriate pulse width for the signal going from the controller to the step/servo motor on the CNC machine. The pulse impulses sent from the controller to the motor have a certain width (as seen below), that cannot be too large due to the signal overlap that occurs otherwise because of each individual signal interfering with the next one. However, as seen in the following instructions from Panasonic' | ||
- | {{:mycnc:pulse-width: | + | A common procedure required for proper motor operation is selecting the appropriate |
- | {{:mycnc: | + | |
- | As another example, the Yaskawa' | + | {{: |
- | {{: | + | As another example, the Yaskawa' |
- | Therefore, the pulses have to have both a minimum width, such that the motor (or the particular setting of that motor, as with the Panasonic MINAS A5-series) is able to register pulses that are sent to it, and a maximum | + | {{: |
- | **In order to select such an appropriate | + | A step motor also requires a minimum pulse width, which is considerably higher than that of a servo motor (around ten to twenty times higher higher when comparing the specs for the Leadshine step motor below to the Yaskawa servo drive): |
+ | {{:mycnc:pulse-width:step-2-1.png}} | ||
- | *Choose | + | As such, the pulse impulses sent from the controller to the motor have to have a certain minimum width for the motor to be able to register those signals. However, that signal width also cannot be too large due to the signal overlap that would otherwise occur due to each individual signal interfering with the next one. This is done by ensuring the controller sends impulse signals |
- | *Convert | + | These constraints on the minimum and the maximum pulse width create a permissible range of pulse widths for each motor depending |
- | *For example, if the desired **[meters/ | + | |
- | *Locate the minimum **[seconds/ | + | ====Pulse Width Calculations==== |
+ | *Choose the speed at which your machine will move in **[meters / minute]** | ||
- | *Using the **[revolutions/second]** value and the minimum allowed | + | *Convert |
- | *For example, if the **[steps/ | + | |
+ | < | ||
+ | 5 meters/ | ||
+ | 80 millimeters/ | ||
+ | The value for the [revolutions / second] | ||
+ | </ | ||
- | *Using the **[revolutions/ | + | *Locate |
- | *For example, | + | |
- | *The value for the **Pulse Width** in myCNC software must be equal or higher than the actual **[seconds/ | + | *Using the **[revolutions / second]** value and the minimum allowed **[seconds / step]** value of the motor, calculate how many **[steps / revolution]** the stepper driver will have to make. |
- | *For example, if the **[seconds/ | + | |
+ | < | ||
+ | 1 ÷ (16 revolutions/ | ||
+ | The value for the number of [steps / revolution] will be equal to 7812.5 steps/ | ||
+ | </ | ||
+ | |||
+ | |||
+ | *As discussed earlier, the value selected on the stepper motor must be equal or smaller than the number of **[steps / revolution]** obtained from the previous step for the motor to register the signal and function properly. | ||
+ | *//For example, if the **[steps / revolution]** value has been calculated to be 7812.5 steps/ | ||
+ | |||
+ | *Using the **[revolutions / second]** value and the updated stepper driver **[steps / revolution]** value, calculate the actual **[seconds / step]** value of the motor. This actual **[seconds / step]** value will always be equal or higher than the minimum allowable **[seconds / step]** value of the motor due to selecting a lower **[steps / revolution]** value in the previous steps. | ||
+ | | ||
+ | < | ||
+ | 1 ÷ (16 revolutions/ | ||
+ | The value for the [seconds / step] will be equal to 9.76 μs/step. | ||
+ | </ | ||
+ | |||
+ | |||
+ | *The value for the **Pulse Width** in myCNC software must be equal or higher than the actual **[seconds / step]** value of the motor. | ||
+ | *//For example, if the **[seconds / step]** value was equal to 9.76 μs/step, and an ET6 or an ET7 board was used, 12 μs would be selected from the chart in the **Common Hardware Settings** tab as it is the closest value that's higher than 9.76 μs// | ||
{{: | {{: | ||
- | *The 12 μs corresponds to Setting 7 in the chart, thus the **Pulse width** value should be set to 7. | + | *The 12 μs corresponds to Setting 7 in the chart, thus the **Pulse width** value should be set to 7 in myCNC software. |
+ | | ||
{{: | {{: | ||
- | *The pulse width setup is now complete. | + | *The pulse width setup is now complete. |
mycnc/mycnc_pulse_width_setup.txt · Last modified: 2024/01/22 11:05 by ivan