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Re: Limit switches and home switches

Peter Homann
 

Bob,

There were 2 terms I used Home and Reference.

The Mach1/2 "Home" switches are used for referencing. When you reference the
machine, The machine moves in the direction configured in the software. The
machine keeps moving until it activates the home switch for each axis. These
switches can be at any position you like. i.e. X=2, Y= -4.3, Z=6.

When the machine activates these switches it knows where it is. i.e.
2,-4.3,6. Without the reference switches the software doesn't now where the
machine is when it powers up. With the switches, you 'Ref all" as the first
operation when you power up. the machine moves until the switches are
activated, and the software now knows where the machine is.

Then, when you instruct the machine to home it goes to 0,0,0 relative to the
reference position, 2,-4.3,6

A lot of machines have the reference position at x=0,y=0. I guess that's why
the reference switches are called home switches in the mach1/2 set-up
screens.

Without the switches, you need to manually jog the machine to a position,
say 0,0,0. type 0,0,0 into the DROs, then press "REF All" The software now
knows where the machine is.

Yes, the accuracy of your reference switches will determine how accurate
your reference positioning is,

Cheers,

Peter Homann
mailto:Peter.Homann@...
Adacel Technologies Limited,
250 Bay St, BRIGHTON, 3186, AUSTRALIA
<>
Telephone +61 (3) 8530 7777, Facsimile +61 (3) 9596 2960
Mobile 0421-601 665

-----Original Message-----
From: bob_quale [mailto:Robert.Quale@...]
Sent: Wednesday, 13 August 2003 12:26 PM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Re: Limit switches and home switches


I thought when you homed, it was based on where you told mach2 home
was originaly, Perhaps x0, y0, z0? so what do you need the switches
for? also would the switches have to trigger precisley?

--- In mach1mach2cnc@..., "Peter Homann"
<peter.homann@a...> wrote:
The simple answer is, in normal operation home switches are meant
to be
activated. Limit switches are not.

When the machined is commanded to reference (or "home") the
machine, the
software moves the machine towards the home switches until they are
activated. The software now knows where the machine is.

The limit switches should only be activated if something is wrong
and the
machine has travelled too far. This is how your machine is wired.

Mach1/2 allows the home and limit functions to use the same
switches.

If you tell the machine to "Reference" then the software is
expecting the
switches to e activated. It therefore treats the switches as home
switches
and nudges the machine off the switch.

During normal operation the switches are treated as limit switches.
If
activated, the software stops the machine in an ESTOP operation.


So, if you want to use the referencing feature of Mach1/2 you have
two
options.

1 - Install a 2nd set of switches for the home switches.

2 - Rewire your machine so that the limit switches are not in
series with
the big red button.

Cheers,




Peter Homann
mailto:Peter.Homann@a...
Adacel Technologies Limited,
250 Bay St, BRIGHTON, 3186, AUSTRALIA
<>
Telephone +61 (3) 8530 7777, Facsimile +61 (3) 9596 2960
Mobile 0421-601 665


-----Original Message-----
From: bob_quale [mailto:Robert.Quale@c...]
Sent: Wednesday, 13 August 2003 10:38 AM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Limit switches and home switches


I'm not sure the difference between limit and home switches. I
have
a bridgeport with limit switches, they are in series with a
mushroom
switch. If one is off, it kills the power to the power supply for
the motors, via a contactor, stopping all motion. I then have a
over
ride to jog off the switch. Where do the home switches come into
play and how do they work?

Bob



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