Problems with setting 'centre override' option to 'force fixed'

[phonoplug]

No doubt some of you are aware of this, but if not here are some observations I have made in using this option. I have an RV1s so you might think this option would have no effect for me, but it does have unexpected effects.

Setting the option to 'Force OTF' isn't something I have tried much. I did briefly have an RV4, but at that time was still getting to know the system as a whole.

Setting the option to 'automatic' leaves the machine to decide which camera to use, or in the case of an RV1, allows it to work "properly"...

Setting the option to 'Force fixed' does indeed cause the main camera to be used for that package, BUT... it also stops the camera from doing vision in multiple images, which you need for larger packages - regardless of the size of the part. Therefore on a large PLCC chip, for example, it will take a lovely image of the centre of the chip, which is no use at all and throw the part away.

...this leads me on to another 'feature' I'll describe in another post.

[Mike]

Yeah, this caught me out for a while - I set force fixed' on a large part as it seemed the obvious setting.
I also encountered a frustrating issue where I had an odd part that wouldn't quite image on the OTF camera, but the dimensions were small enough that it would choose OTF when set to 'automatic'. I think I ended up fixing it by setting the dims over-large to make it force the fixed cam, and the tolerance wide enough to make it accept the too-small size it saw. 

[phonoplug]

You could also have fixed it by increasing the 'pick tolerance' settings. The area the machine determines is needs to look at, (and therefore multi vision or not) is the overall part size determined in the CDF, plus the pick tolerance. Increase the pick tolerance and at some point it will have to use the fixed camera anyway.