Stepper direction on Delta's This is just a query. In the Marlin Firmware it specifically says that DELTA does not invert for the stepper direction. ---------------------------- // Invert the stepper direction. Change (or reverse the motor connector) if an axis goes the wrong way. #define INVERT_X_DIR true // DELTA does not invert #define INVERT_Y_DIR true #define INVERT_Z_DIR true ---------------------------- Is there a specific reason as to why that is? I ask because in tweaking my Kossel Mini to try and get a little larger Printable_Radius I found that that my carriage placement and movement range sort of cuts it down. You see I have a Linear Rail version of the Kossel Mini and the instructions say to to place the rails at a certain distance. With the rails being a certain length the carriages do not go down as far as the pulley versions. My Printable_Radius is more like 80mm so a 160mm diameter. 200mm diameter is what I want and what it should be. So in looking at how it is setup I have two options. I could lower the rails or just invert the carriages. Inverting the carriages would be a lot easier as I have already gone through the process of leveling and squaring everything. But if I do that I need to Invert the directions of the steppers as the belts would also have to flip. Yet the Marlin Firmware specifically says that DELTA's do not invert. So I am wondering why that is. So... Will it cause adverse affects in how things are printed if I do invert them? https://reprap.org/forum/read.php?178,763422,763422#msg-763422 Tue, 09 Jun 2026 14:17:35 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?178,763422,763822#msg-763822 Re: Stepper direction on Delta's https://reprap.org/forum/read.php?178,763422,763822#msg-763822 VectorRoll Delta Machines Sun, 23 Apr 2017 00:03:01 -0400 https://reprap.org/forum/read.php?178,763422,763491#msg-763491 Re: Stepper direction on Delta's https://reprap.org/forum/read.php?178,763422,763491#msg-763491 
#define INVERT_X_DIR false // DELTA does not invert
#define INVERT_Y_DIR false
#define INVERT_Z_DIR false

which is opposite to yours. So I'd say that it's fine to adjust this value.]]> nebbian Delta Machines Fri, 21 Apr 2017 00:47:45 -0400 https://reprap.org/forum/read.php?178,763422,763451#msg-763451 Re: Stepper direction on Delta's https://reprap.org/forum/read.php?178,763422,763451#msg-763451 dc42 Delta Machines Thu, 20 Apr 2017 15:19:18 -0400 https://reprap.org/forum/read.php?178,763422,763422#msg-763422 Stepper direction on Delta's https://reprap.org/forum/read.php?178,763422,763422#msg-763422
In the Marlin Firmware it specifically says that DELTA does not invert for the stepper direction.
----------------------------
// Invert the stepper direction. Change (or reverse the motor connector) if an axis goes the wrong way.
#define INVERT_X_DIR true // DELTA does not invert
#define INVERT_Y_DIR true
#define INVERT_Z_DIR true
----------------------------

Is there a specific reason as to why that is?

I ask because in tweaking my Kossel Mini to try and get a little larger Printable_Radius I found that that my carriage placement and movement range sort of cuts it down. You see I have a Linear Rail version of the Kossel Mini and the instructions say to to place the rails at a certain distance. With the rails being a certain length the carriages do not go down as far as the pulley versions. My Printable_Radius is more like 80mm so a 160mm diameter. 200mm diameter is what I want and what it should be. So in looking at how it is setup I have two options. I could lower the rails or just invert the carriages. Inverting the carriages would be a lot easier as I have already gone through the process of leveling and squaring everything. But if I do that I need to Invert the directions of the steppers as the belts would also have to flip. Yet the Marlin Firmware specifically says that DELTA's do not invert. So I am wondering why that is.
So...
Will it cause adverse affects in how things are printed if I do invert them?]]> VectorRoll Delta Machines Thu, 20 Apr 2017 12:59:52 -0400