Advertisements

CNC 3018-Pro: Home Switches

The CNC 3018-Pro doesn’t absolutely need home switches, but (in principle) they let you install a workholding fixture at a known position, home the axes, pick a preset coordinate system for the fixture, and not have to touch off the axes before making parts.

Having used Makerbot-style endstop switch PCBs for the MPCNC, this was straightforward:

3018 CNC - Endstop switches - overview
3018 CNC – Endstop switches – overview

The X and Z axis switches simply press against the appropriate moving parts:

3018 CNC - X and Z Endstops
3018 CNC – X and Z Endstops

The little tab stuck on the tool clamp provides a bit of clearance around the upper part of the X axis assembly.

The Y axis switch needed a slightly tapered tab to extend the bearing holder:

3018 CNC - Y axis endstop
3018 CNC – Y axis endstop

It’s made from a random scrap of clear plastic, hand-filed to suit, and stuck on the bearing to trigger the switch in exactly the right spot.

You can find elaborate switch mounts on Thingiverse, but I’ve become a big fan of genuine 3M outdoor-rated foam tape for this sort of thing: aggressive stickiness, no deterioration, possible-but-not-easy removal.

The switches need +5 V power, so add a small hack to the CAMTool V3.3 control board to let the connectors plug right in:

3018 CNC CAMTool - Endstop power mod - installed
3018 CNC CAMTool – Endstop power mod – installed

The solid models borrow their central depression around the switch terminals from the MPCNC blocks:

3018 Home Switch Mounts - Slic3r preview
3018 Home Switch Mounts – Slic3r preview

The OpenSCAD source code as a GitHub Gist:

The dimension doodles:

3018 Home Switch Mounts - Dimension Doodles
3018 Home Switch Mounts – Dimension Doodles
Advertisements

,

  1. CNC 3018-Pro: GRBL Configuration | The Smell of Molten Projects in the Morning
  2. CNC 3018-Pro: CD Fixture Probe Camera Target | The Smell of Molten Projects in the Morning

Spam comments get trashed, so don't bother. Comment moderation may cause a delay.

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s