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Author Topic: 'y' and 'z' axis working together?!?!  (Read 4521 times)

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'y' and 'z' axis working together?!?!
« on: January 28, 2009, 10:51:00 AM »
Well I've build my own cnc.I think it has been a fine job, I used ball screws,linear guides from nsk,motors with 15 kgf.
My control works fine at even 7 amperes.
The problem is:
I open mach3, load the g-code that I built just for test,it moves the 3 axis one at a time.
when 'x' works it works very fine,smooth,fast and efficient
when 'y' works it won't work,just whistles (very high frequency noise) and gives some 'cracks" but no movement.
when 'z' woks it works as fine as 'x',but (for my despair) the 'y' works together with it!!.
I've tried everything,but something is still missing.
Please remember I'm not an English speaking person,my native language is Portuguese,so I apologize for some mistake in advance!.
Can someone help me find out what it could be??

Offline jimpinder

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Re: 'y' and 'z' axis working together?!?!
« Reply #1 on: January 28, 2009, 01:03:35 PM »
You do not say how you have wired yur three axis. I assume you have used stepper motor. Each stepper motor has a drive card which require a "step" wire, a "dir" wire and an earth wire.

I assumw you are using an LPT1 parrallel port output to your machine.

The outputs to the machine can be pins 2 to 9 and 1,14,16 and 17.

It is normal, but not essential, that you put X on 2,3  Y on 4,5 and Z on 6,7. 8,9 are normally kept for an A axis but can be used for other things. 1,14,16 and 17 are used for output to the spindle, etc.

These are allocated on Config/Ports and Pins/ Motor Outputs.

Make sure you motor drivers are wire to seperate pins, and also the allocation is properly done on Ports and Pins.


Not me driving the engine - I'm better looking.

Offline Chip

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Re: 'y' and 'z' axis working together?!?!
« Reply #2 on: January 28, 2009, 01:13:58 PM »
Hi, Odinson

Sounds like your Ports & Pins settings are set incorrect, In Motor Outputs re-check your Pin setting's.

1. Direction & Step "Low-Active's", Should be ALL be the Same, Ether All ("Check" or All "X") ed. (Only exception is if your using different type's of driver board's).

If any Axis Run's Backwards, Use, Configure, Home & Limit's, "Reversed", ("Check" or "X") ed., To resolve this.

Just a start, Chip
Re: 'y' and 'z' axis working together?!?!
« Reply #3 on: January 29, 2009, 08:03:43 AM »
Thanks Chip and jimpinder.
I,m using unipolar 15 kgf stepper motors.
each motor has it's own card.they are connected in lpt1.
in my motor outputs I have this:
x-2,3
y-4,5
z-6,7
all direction& step low active are checked, and all ports are '1'.
I've tried uncheking all too,and nothing.
I've tried to change the cards and the sequence but the problem continues.

Offline Hood

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Re: 'y' and 'z' axis working together?!?!
« Reply #4 on: January 29, 2009, 03:30:32 PM »
Check your parallel port cable is not a crossover cable, ie that pin1 goes to pin 1, pin2 to pin2 etc etc.
Hood
Re: 'y' and 'z' axis working together?!?!
« Reply #5 on: January 30, 2009, 07:54:30 AM »
Success at last!
I've checked out  the output pins and find out that my configuration was mismatched.
after that the machine worked fine.
Thanks to all of you.
I've got just 3 more questions:
1.how to jog the 'z' axis??
2.how to enlarge the model in the view window??
3. how to set the measures in the axis to fit the real dimension of my table??(I've got a 900 mm table,but mach3 shows a 500 mm??)

Offline Hood

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Re: 'y' and 'z' axis working together?!?!
« Reply #6 on: January 30, 2009, 09:03:47 AM »
Z axis is usually jogged via Pg Up, Pg Dn keys but you can set up any keys you wish from the System Hotkeys page  from Config menu, just be aware that you may use HotKeys that are used by other functions so be careful.

You can use a scroll wheel on a mouse, just click into the window before you scroll :) If you dont have a scroll wheel on your mouse then press the shift key and click and hold down the mouse left key and move the mouse.

You need to set up the SoftLimits to suit your table, after that the table view will represent the machines actual size.

Hood

Offline Chip

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Re: 'y' and 'z' axis working together?!?!
« Reply #7 on: January 30, 2009, 01:40:25 PM »
Hi, Odinson

Glad you got it working, Would you post the final Motor Outputs settings.

Chip
Re: 'y' and 'z' axis working together?!?!
« Reply #8 on: January 31, 2009, 02:37:34 PM »
It seems the mistake was I had checked max nc10 wave drive box.
and I made it like the figure below
but still I have the problem with the measures.
my actual size of table is 900 x 750 mm,but mach 3 shows 160 x120 mm???
any ideas how to fix it??
An example:
I ask the "z' axis to move in 1 MM,and it goes down 1 mm in the screen,but actually it goes about 3 mm!!
tools broke everytime!
« Last Edit: January 31, 2009, 03:15:32 PM by Odinson »

Offline Hood

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Re: 'y' and 'z' axis working together?!?!
« Reply #9 on: January 31, 2009, 03:24:33 PM »
As I said above it is likely you have set up your softlimits wrong so table size is showing wrong.
On your Z problem, sounds like you have the steps per unit set wrong.
Hood