Dual Endstops Rambo 1.4

LowRider CNC Troubleshooting
1

Forgive me for being daft, but I have looked everywhere for a clear explanation of this. I wish there were pics of the wiring to the Rambo board of a completed project. I am trying to hook up these steppers and endstops but seems quite confusing . The X direction on the lowrider only has one stepper motor, and the Z axis has two. Yet, the boards are always marked with X0, X1 and a single Z on the board. Do you connect the z stepper motors to the x0,x1 and the single stepper motor of X travel to the Z pins?

Thank you in advance, had it working without endstops and reflashed with dual endstops. Really, simply want to get autoleveling with the Z axis as one side is always a little higher than the other. When I power down the gantry moves to the bed.

Mark

2

The Low Rider needs a change in the firmware to configure it to swap the second Y with a second Z. I don’t think Ryan flashes dual endstops in the LR configuration. @vicious1 can correct me if I’m wrong.

But if you did have the right firmware, X1 is in the port labelled X. Y in Y. Z1 in Z. X2 in E0 and Z2 in E1.

If you have an MPCNC, then it it would be X1, Y1, Z, X2, Y2. We onky ever use one of the Z ports. Those are actually the same and wired in parallel (which is inferior to series).

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3

Am I this ignorant? Isn’t there only one X stepper motor and 2Y and 2 Z stepper motors? Using V1CNC Dual firmware on Rambo 1.4 board.

4

You’re not ignorant. I swear!

The MPCNC is different than the Low Rider.

The MPCNC has 2xX, 2xY, 1xZ motors

The Low Rider has 2xX, 1xY, 2xZ motors. If you rotate the table, and not your coordinates, then you can have 2xY and 1xX. I thought Ryan’s nomenclature was to have 2xX though…

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5

Steppers are wired in series, so you only need one driver for the two y steppers, and two z steppers.

@jeffeb3 Pretty sure x has always been the single stepper.

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6

OK, starting to get it. I built a Lowrider2 4x4 ft. X axis with the gantry (only one motor). Will have one endstop on X, Y0,Y1 endstops for autosquaring, Z0, Z1 endstops for autolevelling

lr2pic
lr2pic1960×4032 1.72 MB

7

That is right, for dual endstops. You also need to change fhe firmware a little on the rambo.

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8

I will play with this some more Thank you Jeff and Barry. Your timely responses are so appreciated. This is such a great forum.

Mark

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9

Hi there!
I’m building the lowrider2 with a Rambo1.4 and using the V1CNC_Rambo_Dual firmware. My problem is that E0 is used for X1 and E1 for Y1. So how do I have to change the pins to get it working?

10

In configuration_adv.h you can find these settings. You have to comment out dual X and enable dual Z.

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11

That was easy!
Thank you for responding so quickly. I don’t know where to give you guys feedback so thanks for offering these builds and maintaining the website. Without you I weren’t be able to build or afford a cnc.

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12

So this is how it needs to be set up to use the x2 port on rambo 1.4 to get the 2nd z motor get be able to left the Lowrider 2 up

//#define X_DUAL_STEPPER_DRIVERS
#if ENABLED(X_DUAL_STEPPER_DRIVERS)
#define INVERT_X2_VS_X_DIR true // Set ‘true’ if X motors should rotate in opposite directions
//#define X_DUAL_ENDSTOPS
#if ENABLED(X_DUAL_ENDSTOPS)
#define X2_USE_ENDSTOP XMAX
#define X2_ENDSTOP_ADJUSTMENT 0
#endif
#endif

#define Y_DUAL_STEPPER_DRIVERS
#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
#define INVERT_Y2_VS_Y_DIR true // Set ‘true’ if Y motors should rotate in opposite directions
#define Y_DUAL_ENDSTOPS
#if ENABLED(Y_DUAL_ENDSTOPS)
#define Y2_USE_ENDSTOP YMAX
#define Y2_ENDSTOP_ADJUSTMENT 0
#endif
#endif

//
// For Z set the number of stepper drivers
//
#define NUM_Z_STEPPER_DRIVERS 1 // (1-4) Z options change based on how many

#if NUM_Z_STEPPER_DRIVERS > 1
#define Z_MULTI_ENDSTOPS
#if ENABLED(Z_MULTI_ENDSTOPS)
#define Z2_USE_ENDSTOP XMAX
#define Z2_ENDSTOP_ADJUSTMENT 0
#if NUM_Z_STEPPER_DRIVERS >= 3
#define Z3_USE_ENDSTOP YMAX
#define Z3_ENDSTOP_ADJUSTMENT 0
#endif
#if NUM_Z_STEPPER_DRIVERS >= 4
#define Z4_USE_ENDSTOP ZMAX
#define Z4_ENDSTOP_ADJUSTMENT 0
#endif
#endif
#endif

13

That doesn’t look right for dual Z steppers. That looks like it still only has one Z driver. How do you have that wired?

14

2 both plugged into the z ports side by side but one motor can not lift the X axis and gets uneven.

15

Those ports are wired in parallel, you need to have them wired in series…

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16

tring to use x2 port on board

17

The Z2 should be plugged into E1. You need to change that line to:

#define NUM_Z_STEPPER_DRIVERS 2
18

thanks I did that now arduino decided to crap on me and will not load in the program or my bad arduino will not open up

19

Thanks for the help is is working now and z motor does not hang up anymore thanks so much for the help guys. :grin: @jeffeb3

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20

1 of the z motors do not go down when using the z probe that came from V1 . one of the motors are in the y plug and you helped me get that working so no more not going up thanks @jeffeb3 for the help maybe , hopefully you can help e with this