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Author Topic: Wiring Limit & Home Switch  (Read 15632 times)

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Offline Hood

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Re: Wiring Limit & Home Switch
« Reply #30 on: February 09, 2011, 08:46:24 AM »
Do you have a Z Home switch? If yes then you wont be screwing about with Homing without Home switches ;)
If you dont then the axis will not move when you do a RefAll.
Not read the doc but if you want to home without switches you need to manually move the axis to a known position before you press the Ref All.
Hood

Offline kolias

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Re: Wiring Limit & Home Switch
« Reply #31 on: February 09, 2011, 12:03:42 PM »
Sorry Hood, my mistake

I do have two limit switches on the Z axis but they both share the same pin number on the BOB and so I cant consider one of them as a Home switch

Thank you
Nicolas

Offline Hood

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Re: Wiring Limit & Home Switch
« Reply #32 on: February 09, 2011, 12:12:00 PM »
You can use one as a home switch :) Just set the Z home to same port and pin as the Z Limits use.
Hood

Offline Tweakie.CNC

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Re: Wiring Limit & Home Switch
« Reply #33 on: February 09, 2011, 12:16:18 PM »
You can use your limit switch as a home switch because when set-up the axis will only home in the one direction.

Tweakie.

(In answer to your earlier question re soft limits - the axis would home to the 0.25" position because that is the figure Rich specified in his setup).
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline kolias

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Re: Wiring Limit & Home Switch
« Reply #34 on: February 09, 2011, 01:05:25 PM »
You can use one as a home switch :) Just set the Z home to same port and pin as the Z Limits use.
Hood

 I did this but the axis moves in the plus direction when I hit the Home button. I switched on the Active Low but then I get a message that one limit is one and I have to press reset

The keyboard arrows move the axis correctly.

How can I get the axis to Home in the negative direction?
Nicolas

Offline Hood

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Re: Wiring Limit & Home Switch
« Reply #35 on: February 09, 2011, 01:36:47 PM »
The Z should move in the positive direction when you home, ie up the way. Homing down the way is not a good thing to do as it would cause problems with the spindle fouling clamps. work pieces or even the table.
Hood

Offline kolias

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Re: Wiring Limit & Home Switch
« Reply #36 on: February 09, 2011, 07:21:13 PM »
The Y and Z axis are Homing ok now but the X axis was Homing in the wrong direction

So I went to the Motor Home/Soft Limits and un ticked the Home Negative like the Z axis

I wonder why the X axis was Homing in the wrong direction

Also on the same screen I have set the Slow Zone to 2.00 and the Speed % to 20. I understand that the Slow Zone means when the axis approaches the 2.00 the speed will be reduced to 20% until she hits Home. But this does not happen, no matter where the axes are when I Ref Home they start moving to Home at the 20% speed. What I do wrong?


Nicolas

Offline ger21

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Re: Wiring Limit & Home Switch
« Reply #37 on: February 09, 2011, 07:41:12 PM »
Slow zone is for soft limits, not homing.
Gerry

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