How to Install Limit Switches onto Your LongMill MK2 CNC

In this tutorial video, I'll walk you through the installation process of the Inductive sensors for the LongMill MK2. These limit switches unlock a few extra features for your CNC machine. It’ll allow you to have multiple workspaces and a consistent home location for your machine. Limit switches allow you to pause your job if it's too long to come back to the same location at a later time or to recover from a failure.
In the follow-up video, we’ll walk you through the process of enabling the sensors, what hard and soft limits are, and how to set up your CNC machine for success.
How to enable the sensors in the firmware
bit.ly/4arrRka
// FEATURED TOOLS & SOFTWARES
MK2 Inductive Sensor Kit
bit.ly/3wBjOTp
Inductive Sensor Extension Cable
bit.ly/3Ij0psP
MK1 Inductive Sensor Kit
sienci.com/product/inductive-...
Mk1 Inductive Sensor Installation Video
• Introducing the Induct...
Chapters:
0:00 Introduction
0:19 Sensor Placement
0:45 Z-Axis Sensor Installation
1:47 X-Axis Sensor Installation
2:20 X-Axis Sensor Extension Installation
2:58 Y-Axis Sensor Installation
5:35 Sensor Wire Connecting
5:56 Y-Sensor Adjustment
7:12 Z-Sensor Adjustment
8:32 X-Sensor Adjustment
// Resources
MK2 Limit Switches Resources
bit.ly/49LWhxa
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[@shughes599]

I got very lucky on y axis bracket install but I could see it taking hours. I might suggest that with as many spare parts come with initial build the instructions should just have you put one in each corner at initial assembly, tighten them down and forget them until it’s sensor time.

[@SienciLabs]

Thanks for the suggestion! I'll pass this idea along to the powers that be. Really glad that you are up and running, if you have any other feedback, we'd love to hear it.

[@steverowland1898]

When will you be making the video showing how to configure and use the limit switches in g sender? The documentation does not seem as complete or as easy to follow as a video. It seems that another viewer has the same question (Mace Eliason).

[@SienciLabs]

There may be a pt.2 down the line, but in the meantime the instructions for the configuration can be found here: resources.sienci.com/view/lmk2-limit-switches/#firmware-changes

[@IceCreams62]

At 05:35 you inverted X and Z limit switch connectors 🙂

[@kevinmartin7760]

It looks like the Y bracket would be easier installed during assembly of the mill. Alternatively, a hole in the table so a long Allen key can be used from below would also help.

[@SienciLabs]

Technically yes, it would be easier at the start. We do mention and show the assembly process in the last 48x30 assembly video. That being said, we generally don't recommend using the homing switches until getting familiar with the CNC in general, so a lot of people still get it after they started.

[@steverowland1898]

The tricky bit! After 15 minutes I quit fiddling and opened the tee nut access hole with a Dremel allowing the bolt to be pre assembled with the tee nut.

[@mneliason]

We’re can I find the next video on enabeling in gsender? Watched the video waiting for that part and sadly it’s not there

[@SienciLabs]

Hi Mace, we're still in the process of filming the other videos but this whole process is already written in our online resources (the videos are just being made as an alternate point of reference). Because of this, you can still easily finish the setup process using the documentation: resources.sienci.com/view/lmk2-limit-switches/#firmware-changes

[@derekjenkinson8014]

It’s it just me, or when doing the z axis the bolt on the backlash assembly hits the lead screw lock nut? This isn’t ideal, as the newer locknuts are thicker and impact the gantry before the limit is covered.

[@markgiao2489]

Just attempted to install mine and this issue is occurring. The new style backlash adjuster hits the lead screw lock nut before it can even get in range of the sensor. Likely build my own bracket as the current setup needs a bit more engineering.

[@derekjenkinson8014]

@@markgiao2489 I got it to work, but I would suggest that it's something to resolve for the MK3

[@villageidiot8718]

I may have missed it somewhere,. I'm saving my allowance, again, to get a Longmill. Why are we using inductive sensors rather than micro-switches which are more compact and less expensive?

[@SienciLabs]

A lot of the value and reasoning for selecting inductive sensors over mechanical micro switches on a CNC router is that the switches can fail or become less reliable from being in a dusty environment or seeing repeated actuations whereas the sensors have no moving pieces and are fully enclosed. You'll see this choice for greater reliability on other CNCs as well 👍

[@villageidiot8718]

@@SienciLabs Okay, thanks. Good points. I hadn't considered dust.

[@dwaynejohnson7499]

I have my switches and have yet to connect as I did not have no idea how to, thanks for this video, am going to follow it and connect mine.