LowRider 3 CNC, LR3 Release notes

[vicious1 (Ryan)]

@juicyjesus

the z motors are plugged into the two Z motor ports. Is that correct?

No. Wiring The Steppers - V1 Engineering Documentation
Or individually wired since you have the option for 5 steppers. That is most powerful.

[juicyjesus (Aden)]

So my RAMBO has a X, Y, Z, Z, E0 and E1. Does the dual Z only count as one stepper?

In the documentation, it says to put X2 and Y2 into the E steppers.
I now see a small note about Z2 if it’s a low rider.

That makes sense, I had Y2 in E1 and noticed it was moving when I was testing the z motors.

Back to try again!

[juicyjesus (Aden)]

Still getting issues after connecting properly.

video 1660816195

Is it a rod alignment issue perhaps?

[jeffeb3]

@juicyjesus

So my RAMBO has a X, Y, Z, Z, E0 and E1

Those two Z are wired in parallel, which will half the current. Don’t use the second Z. Either use dualLR firmware, which will make the E1 port Z2, or use a serial wiring adapter on the first Z port.

You also need to lube leadscrews.

[juicyjesus (Aden)]

Thanks Jeff.

The documents show where to wire the endstops for Z1 and Z2, but those are for the parallel option.
When using E1 as Z2, how do I wire the end stop?

[jeffeb3]

There are three ways to wire it:

Dual LR, or independent. One motor per stepper driver. You just wire Z2 to E1.

Parallel, which is wiring two motors to one driver and splitting the current between them. This is just wiring wire 1 of both motors together and wire 2 of both motors together, etc. This isn’t a good way to do it.

Series (I sometimes say serial, sorry), which is wiring two motors to one driver, but in a way that the current has to go through both coils. Wiring The Steppers - V1 Engineering Documentation

Don’t wire them in parallel. The two Z ports on the rambo are wired to the same driver, in parallel. Either make a wiring harness to make them series, or better yet, just flash the rambo with the dualLR firmware and put the second Z in E1.

[juicyjesus (Aden)]

OI was asking about the endstops now, but I think I found my answer. Z1 motor in the normal z stepper, and z endstop.
Z2 in E1 stepper, and Xmax endstop. Right?

[azab2c]

@azab2c

What lengths should endstop wiring be (4’x8’ build) for folks needing to crimp/solder wiring with SKR boards? For the dupont-to-spade connected SKR-to-endstop wiring.

Didn’t see wiring length list in LowRider CNC V3 - V1 Engineering Documentation , or, on LowRider V3 Calculator - V1 Engineering Documentation if wiring length varies with build dimensions.

@KL2001 asked similar question today. Didn’t come across any recommendations during my build, so…

Just posted some endstop wiring info sharing what I did, what I learnt, and clips showing how I wired/built my LR3. Hope that helps folks.

[juicyjesus (Aden)]

I’ve completely assembled my lowrider (yay)
Now that the vacuum tube and router are installed, the z motors can’t lift all the way to the end stop if the X carriage is on its side.
Is there a way to tell the X to home first then move to the centre before Z homes?

Additionally, my x axis is long enough that the homing process times out and fails before completion. Can I tell it to home for longer?

I know I need to edit the firmware but not sure where to begin.

[vicious1 (Ryan)]

@juicyjesus

I’ve completely assembled my lowrider

Let’s do this in your build thread, and please post some pictures if we can look for obvious issues. Where the router is should never have any impact on lifting. The machine is capable of far far more weight than a router.

[adamantium1987 (Adam)]

Does anyone have a way to print the dxf files to use as a template for to cut on manually ?

[vicious1 (Ryan)]

Most any program that can view a DXF will print them out to scale.