Limit only Z speed

GRB352

I need to limit Z speed to 80, but keep X and Y at 500.

#define MAX_FEEDRATE_X 500

#define MAX_FEEDRATE_Y 500

#define MAX_FEEDRATE_Z 80

doesn't seem to cut it.

and if I change MaxFeedrate in EEPROM, it changes the max speed for XY and Z

Repetier

What you described is only valid for delta printers. Cartesian printers have x,y and z as separate values in eeprom. For delta this is not required.

GRB352

I have a delta. I would like to limit the Z-speed, but not the XY. What is required?

GRB352

This is why

Repetier

You need to change the firmware a bit. In Printer.cpp go to void Printer::updateDerivedParameter()

and find this line

maxFeedrate[X_AXIS] = maxFeedrate[Y_AXIS] = maxFeedrate[Z_AXIS];

where you see xy max feedrate is replaced by z feedrate. Assign here your xy max speed instead.

GRB352

I can't seem to figure out the syntax...triple equal signs are strange. none of these worked

--------------------------------------------------------------------------------

maxFeedrate[X_AXIS] = 500;

maxFeedrate[Y_AXIS] = 500;

maxFeedrate[Z_AXIS] = 80;

--------------------------------------------------------------------------------

maxFeedrate[X_AXIS] = maxFeedrate[Y_AXIS] = 500;

maxFeedrate[Z_AXIS] = 80;

--------------------------------------------------------------------------------

maxFeedrate[500] = maxFeedrate[500] = maxFeedrate[80];

--------------------------------------------------------------------------------

maxFeedrate[X_AXIS] = maxFeedrate[Y_AXIS] = maxFeedrate[Z_AXIS];

--------------------------------------------------------------------------------

maxFeedrate[X_AXIS] = maxFeedrate[Y_AXIS] = maxFeedrate[Z_AXIS];

maxFeedrate[Z_AXIS] = 80;

--------------------------------------------------------------------------------

500 = 500 = 80;

--------------------------------------------------------------------------------

500[X_AXIS] = 500[Y_AXIS] = 80[Z_AXIS];

I also tried changing

float Printer::maxFeedrate[E_AXIS_ARRAY] = {MAX_FEEDRATE_X, MAX_FEEDRATE_Y, MAX_FEEDRATE_Z}; ///< Maximum allowed feedrate.

to

float Printer::maxFeedrate[E_AXIS_ARRAY] = {500, 500, 90}; ///< Maximum allowed feedrate.

Repetier

Replacing it with

maxFeedrate[X_AXIS] = maxFeedrate[Y_AXIS] = 500;

should work. What is the error message when you do so?

GRB352

There is no Error message, it just runs everything at 80. 

I tried again to be sure, I replaced:

maxFeedrate[X_AXIS] = maxFeedrate[Y_AXIS] = maxFeedrate[Z_AXIS];

with 

maxFeedrate[X_AXIS] = maxFeedrate[Y_AXIS] = 500;

congiuration.h

#define MAX_FEEDRATE_X 80

#define MAX_FEEDRATE_Y 80

#define MAX_FEEDRATE_Z 80

and made sure to set maxfeedrate to 80 in EEPROM

Just for fun I also tried:

#define MAX_FEEDRATE_X 500

#define MAX_FEEDRATE_Y 500

#define MAX_FEEDRATE_Z 500

and 

maxFeedrate[Z_AXIS] = 80

This also runs everything at 80.

If I put everything back It still works at 500

Repetier

You are right, there is a second position that prevents this. That is in motion.cpp line 474

    if(isXMove())

    {

        axisInterval[X_AXIS] = axisDistanceMM[X_AXIS] * toTicks / (Printer::maxFeedrate[X_AXIS]); // mm*ticks/s/(mm/s*steps) = ticks/step

#if !NONLINEAR_SYSTEM || defined(FAST_COREXYZ)

        limitInterval = RMath::max(axisInterval[X_AXIS], limitInterval);

#endif

    }

    else axisInterval[X_AXIS] = 0;

    if(isYMove())

    {

        axisInterval[Y_AXIS] = axisDistanceMM[Y_AXIS] * toTicks / Printer::maxFeedrate[Y_AXIS];

#if !NONLINEAR_SYSTEM || defined(FAST_COREXYZ)

        limitInterval = RMath::max(axisInterval[Y_AXIS], limitInterval);

#endif

    }

    else axisInterval[Y_AXIS] = 0;

    if(isZMove())   // normally no move in z direction

    {

        axisInterval[Z_AXIS] = axisDistanceMM[Z_AXIS] * toTicks / Printer::maxFeedrate[Z_AXIS]; // must prevent overflow!

#if !NONLINEAR_SYSTEM || defined(FAST_COREXYZ)

        limitInterval = RMath::max(axisInterval[Z_AXIS], limitInterval);

#endif

    }

    else axisInterval[Z_AXIS] = 0;

Here you see that the new limit is only taken for non delta systems. Remove the #if / #end lines to store reduced limit