Has anyone considered using the Trinamic drivers to do sensorless dual endstops? For those who aren’t aware, some of the stepper drivers produced by Trinamic can sense the feedback from the force being exerted on a stepper (like running into something). Sensorless Endstops? In 3D printing, this is …

I should probably get in on this chat :slight_smile: YES I have a SKR 1.3 with TMC2130’s and dual endstops on Y and Z and sensorless homing on all axis. I havent tried stall detection yet though. With the LR2, there are a couple things to watch out for before you ruin your CNC, as it’s not design…

That’s really neat! I imagine that will be the way everything is done in the future. Marlin has a firmware definition to tell it where to do the Z homing… I think it’s SAFE_HOMING or something like that

Now, that’s what I’m talking about! I wasn’t really looking for Z homing as I just assumed that the leverage from the Z screw mixed with a very pointy bit would inevitably mean that the cutting edge sinks into the material a tiny amount before it registers, leaving a mark and potentially throwing o…

[image] colt45: Now, that’s what I’m talking about! I wasn’t really looking for Z homing as I just assumed that the leverage from the Z screw mixed with a very pointy bit would inevitably mean that the cutting edge sinks into the material a tiny amount before it registers, leaving a mark and po…

Ideally you could home to make the Z square (possibly at Zmax) and then probe to get the workspace Z=0.

Just don’t try homing z with a v bit endmill. I did that once, and it buried it up to the collet. Didn’t even slow down. This was in half inch plywood. MDF might have broken the endmill.

[image] twolf: Colton McCormack wrote: Now, that’s what I’m talking about! I wasn’t really looking for Z homing as I just assumed that the leverage from the Z screw mixed with a very pointy bit would inevitably mean that the cutting edge sinks into the material a tiny amount before it registers…

[image] barry99705: Just don’t try homing z with a v bit endmill. I did that once, and it buried it up to the collet. Didn’t even slow down. This was in half inch plywood. MDF might have broken the endmill. I have a Z homing setup with a pressure disc and an aluminum plate on top. Could proba…

Saw an MPCNC burn to death on the V1 Facebook page due to the Z-axis plunging into the work surface unexpectedly (power loss? bad g-code? interference?). I think that’s a great example of why stall detection is a good idea, especially with a relay controlled spindle that can be immediately powered o…

That is a good lesson in not leaving your machine alone. Stall detection won’t help if you have bad gcode, or you mount the bit at the wrong depth. These are way more dangerous than 3D printers and they need to be watched by humans.

Sensorless Dual Endstops and Stall Detection - Trinamics

LowRider CNC Advice

KCGreg January 27, 2020, 7:57pm 23

Hi all, I just created a post where this is working on a new Marlin build with minimal changes to just configuration.h and configuration_adv.h. Here is the link: