QRD1114 home sensors installed and tested

by Stephen Hobley on July 7, 2010

I “test fitted” the sensor circuits to the gantry tonight and I’m pleased to say that they work with a surprising degree of accuracy.

The sensors are wired to input pins 11 (X), 12 (Y) and 15 (Z). I used the Mach 3 “auto set” feature to configure the pins as home for M1, M2 and M3.

A neat feature of the homing functions (Ref) in Mach 3 is that it homes past the switch limit, then backs up to the on position, so the home is always referenced from the same position.

UPDATE : After giving this some thought it occurred to me that the home position doesn’t really have to be at the origin at all. It just needs to be a fixed reference point, so that the machine can “pick up where it left off” from a known location. Changing the tool on the router will typically nudge the motors and cause the software to get out of sync with current position.

I believe it is possible to script Mach3 to move to a fixed offset away from the “home” position, and use this to set the start point for the cut.

I’ll have to put together a movie that shows how Mach3 is configured too.

Share

{ 2 comments… read them below or add one }

ril3y September 23, 2010 at 7:41 am

When did you get this router? I see blogs with your older router. No news announcing this one? :)

Riley

Stephen Hobley September 23, 2010 at 8:33 am

Riley: This is a kit router from http://www.buildyourcnc.com – Patrick Hood-Daniel is the guy that designed it. Mine is the BlackToe 2×4 – my buddy Pete has the 4×8 that he built from the DXF files. Now that it’s tuned up it works pretty well.

My plan is to turn the other CNC into a 3D printer.

Leave a Comment

Comments links could be nofollow free.

Previous post:

Next post: