MDF Rose Engine 2.0
Nextion Multiple Stepper Control User's Guide

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Used to initiate movement in the indicated direction on an axis. Movement continues until Stop is pushed.

Used to stop the motion of the stepper motor.

Used to return the spindle or the selected axis to the start point of the previous operation.

Used to initiate movement in the indicated direction on an axis. Movement continues until Stop is pushed.

Touch Config on the screen image above to see the details for this screen.
This is used to display or edit the configuration settings for the MaxSpeed and the Acceleration for the respective stepper motors.
Greek Key Pattern Screen

Purpose: This screen allows the user to

Patterns are created by moving the spindle, or one of two axes individually.


File
Touch File on the screen image to the right to see the details for this option.
Used to create a Greek Key by reading values from a file.
 
Pattern Used to create a Greek Key using one of the built-in patterns (2a, 2b, 3a, etc.).

Axial Used to create a pattern axially
 
Radial Used to create a pattern radially (circumferentially)

Built-in Patterns
Segments Pattern
Wide Tall
2 3 2a
6 2b
3 4 3a
8 3b
4 8 4a
13 4b
 

  Count   This determines the actual number of patterns to create. Setting it less than the Patterns/360 value will leave a space at the end of the pattern. Setting it larger will recut the same pattern. This is useful when you want to cut a pattern deeper.
 
  Length   This specifies the length of the shortest Z or X axis segment. Each pattern will have segments which are a multiple of the shortest segment.
 
  Patterns / 360   This specifies how many individual patterns will fit in 360 degree rotation of the spindle. This controls the length of the shortest spindle segment.

 
  B Radius   This is the distance from the center of rotation to the location where the force is applied to drive the rotation.

This field is only visible when moving on the B axis.

Speed The controls on the left and right side of the screen are for controlling the respective stepper motor's speed and acceleration.

To change the Max Speed, touch the number, and you will be presented with the Number Pad Screen.

The slider is a red bar that can be moved up to increase the speed, or down to decrease it. The percentage shown in the bar (96% on the left, 81% on the right) shows the percentage of the Max Speed at which the stepper motor is set to run.

There is a slider for the stepper motor on each axis, and they operate independently.

The top number is the max speed for the respective axis' stepper motor. This is measured in pulses / second. The MDF Rose Engine 2.0 are set to 6,400 pulses / revolution, so a max speed of 8428 would equate to \[ \begin{align} MaxSpindleRPM & = \frac{8,428 \, \frac{\mathrm{pulses}}{\mathrm{sec}} \times \, 60 \, \frac{\mathrm{sec}}{\mathrm{min}}} {6,400 \, \frac{\mathrm{pulses}}{\mathrm{rev}} \times \, 9 \, \frac{\mathrm{motor \, revs}}{\mathrm{spindle \, revs}}} \\ & = 8.8 \, \mathrm{RPM} \end{align} \]

Thusly, at 96%,the spindle's speed is \[ \begin{align} SpindleRPM & = MaxSpindleRPM \times \, 0.96 \\ & = 8.4 \, \mathrm{RPM} \end{align} \]


The other stepper motor (in this case, on the Z axis) directly drives the motion. Thusly, a max speed of 6300 would equate to \[ \begin{align} MaxRPM & = \frac{6,300 \, \frac{\mathrm{pulses}}{\mathrm{sec}} \times \, 60 \, \frac{\mathrm{sec}}{\mathrm{min}}} {6,400 \, \frac{\mathrm{pulses}}{\mathrm{rev}}} \\ & = 59 \, \mathrm{RPM} \end{align} \]

Thusly, at 81%,the motor's speed is \[ \begin{align} RPM & = MaxRPM \times \, 0.81 \\ & = 48 \, \mathrm{RPM} \end{align} \]

And if the lead screw has a pitch of 2mm and 4 starts, it will move 8mm per revolution. At the set speed, this is \[ \begin{align} Movement Speed & = RPM \times \, 8 \frac{\mathrm{mm}}{\mathrm{rev}} \\ & = 384 \, \frac{\mathrm{mm}}{\mathrm{min}} \end{align} \]

 
Acceleration The bottom number (7410 on the left; 4300 on the right) is the acceleration for the stepper motor.

To change this value, touch the number, and you will be presented with the Number Pad Screen.


Limit Switches

Limit switches cannot be used with this function. They can only be used from the Main Screen or One Screen.


Specific Axis Notes

Axis Comments
Spindle
Movement continues until the identified movement distance is completed, or the stop button (shown to the right) is used.
Z Movement on this axis is the same as for the spindle.
X Movement on this axis is the same as for the spindle.
B The fields on this screen are used with the fields and settings on the B Axis Configuration screen to calculate how long to run the stepper motor to achieve the desired rotation.

Movement on this axis is the same as for the spindle.