You might consider homing the head prior to energizing the high pressure 
hoses.  Only a sequence control.


----- Original Message ----- 
From: "Viesturs Lacis" <viesturs.la...@gmail.com>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Sent: Friday, May 14, 2010 7:35
Subject: Re: [Emc-users] Homing of rotary axis


2010/5/14 Andy Pugh <a...@andypugh.fsnet.co.uk>:
> On 14 May 2010 00:16, <sa...@free.fr> wrote:
>
>
>
> (Ian, your idea would work fine too, but he asked to minimise the
> amount of movement that his hoses are subjected to)
>

Yes, the essence is that I do not want the head to tilt those 50
degrees (which is maximum tilt angle) every time i turn on the
machine, because it puts a lot of stress to high-pressure tubing
(water pressure reaches ~4000 bar).

Ian, thank You for a suggestion on playing with HOME_OFFSET value for
fine-tuning the home position. I find that in some cases it might be
easier than adjusting the home switch itself.

> I think it need be nothing more complex than a semi-circular metal disc on 
> the rear shaft
> extension of the motor and an optical slot detector.

Yes, it seems like a pretty simple setup to me too, Thank You for an idea!

Viesturs

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