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Messages - jon@daysite.net

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General Mach Discussion / Re: Homing LURCH issue, Mach3
« on: November 14, 2015, 09:27:46 AM »
Thanks for that Robert!  The motors and drives work properly, in that the machine actually produces accurate parts. The other odd thing is that X and Z home switch cables run through a cable chain tightly bundled with all kinds of power cables including the 5hp spindle cables.  The Y axis home switch cable is only about 3 feet long, yet it is the only problem child.

...... brainstorm .. 30 minutes later

OK Problem solved.  The 4 conductor cable that connects the Y axis home switch WAS shared with the tool height switch.  2 for the Y home switch and 2 for the tool switch. Just to eliminate all the possibilities, I clipped the wires that connect the tool switch, and now Y homes as it should, even after lowering the debounce to 5.  I don't get that at all!  But whatever.  Hopefully the problem with not return after a separate cable is run to the tool switch.  :)

Thanks again to you and Gerry for the suggestions.


General Mach Discussion / Re: Homing LURCH issue, Mach3
« on: November 14, 2015, 07:36:06 AM »
I replied a couple of days ago... not sure where the post went.

Thanks for the reply.  That worked!  Y axis now moves as it should.

The debounce was set to 0.  Set it to 500, and that helped, but the axis would stop short of the switch.  Kept increasing till it reached 5000, and all works properly now.  Have begun to work on noise issues for a more permanent solution.

Thanks again....


General Mach Discussion / Homing LURCH issue, Mach3
« on: November 12, 2015, 02:28:45 PM »

Ok, so this is weird.  Both X and Z axis' home just fine.  They travel to their switch, stop, then back off the switch, just as advertised.  Great!

The Y axis is another story.   When any of its Ref buttons are clicked, the machine either lurches, bumps, or travels a very short distance towards the home switch, and stops.  Sometimes it does absolutely nothing.  Sometimes all I notice is a thud, ie the servo did something, but no detectable movement.  Other times it moves up to an inch.  Wow!  But never has it traveled to the home switch.

When in operation all 3 axis' work just fine.  The only issue is Y axis homing. 


The diagnostics screen shows the Y axis Port Pin and M2Home leds lighting up together.  X and Z have different Port Pin leds paired with M1Home and M3Home.

The Input Signals screen shows X Home on Pin 13, Y Home on Pin 15, and Z home on Pin 12.

The limit switch settings have been disabled until the homing issue is resolved.

All 3 axis' are set to “Home Negative” and “Auto Zero”.   And there are no slave axis'.

I've tried switching the pins on the BOB, but find the Y axis still misbehaving.

There are NO running Brains.

No errors anywhere.  The Configuration Check Facily is clean as is the error status sine and popup window.

Haven't found anything similar on the forum, so HELP anybody.  It's driving me nuts.  There must be some setting buried on or under some screen that I missed.


General Mach Discussion / Re: Z Axis not moving afer loading GCode
« on: May 12, 2015, 02:04:36 PM »
and here is the XML file

General Mach Discussion / Re: Z Axis not moving afer loading GCode
« on: May 12, 2015, 02:00:11 PM »
Thanks for the quick reply!

Yes, Z axis jogs just fine until the GCode is loaded, then Z can't be jogged.

X and Y axis work before and after loading GCode.

Complete GCode attached.  XML on next post

Thanks again!

General Mach Discussion / Re: Z Axis not moving afer loading GCode
« on: May 12, 2015, 08:34:34 AM »
Have been going round and round on this..... ughhhhh! 

When I load the roadrunner sample GCode, all works properly.  However when GCode from my BobCAD gets loaded, the Z axis will not move with the PageUp / PageDown keys.  The code runs properly, but can't zero the z axis.

Here is the header and first few lines of GCode.

(MTOOL T1 S1 D.25 C0. A0. H2.5)
(SBOX X0. Y0. Z-1.5 L16. W3.5 H1.5)

(DATE - FRI. 05/01/2015)
(TIME - 04:29PM)

N01 G20 G40 G49 G54 G80 G90 G91.1
;N02 G53 Z0.

(Machine Setup - 1  Pocket)

;N03 T1 M6
N04 S3819 M03
N05 G00 G90 G54 X1.025 Y2.75
;N06 G43 H1 Z1. M08
N07 Z.2
N08 Z.1
N09 G01 Z0. F45.8366
N10 Z-.25
N11 G17 G03 X.975 Y2.75 I-.025 J0. F91.6732
N12 X1.025 Y2.75 I.025 J0.

General Mach Discussion / Re: Z Axis not moving afer loading GCode
« on: May 05, 2015, 01:46:41 PM »

General Mach Discussion / Z Axis not moving afer loading GCode
« on: May 01, 2015, 02:22:40 PM »
Machine jogs properly, with arrow keys and PgUp and PgDn.  After the GCode is loaded, can't jog Z Axis with PgUp and PgDn.  The machine will run the code, but kind of hard to zero the z axis.

Anyone have any ideas.   Have been looking similar issues for a couple of days now.

Mach 3
3 axis router NO ATC


Hi All
New to MachSupport forum.  Very active site!  Registered in February, but this is my first post.

Just got Mach3 a few months ago.  Love it!

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