Re: tool changer logic- mathematical challenge

This is just a WAG (wild ass guess).

To do it with only one sensor active (or not) at a time 45 degree
opening 22.5 degrees out of angular alignment with the number 1
position.

That would meet the requirement of a single sensor (of four), and in
this case any opening between 22.5 and 45 degrees would work.

Somewhere else you mentioned a backup circuit, backing up to hold
position, you would need to change the angular alignment from 22.5
degrees out, to 0 degrees (just enough to trip the sensor). That
would allow you to index all the way around through each of the 4
sensors and change the state of one sensor at a time, based on only
45 degrees of motion.

The offset of angular alignment is only needed for real world
applications, theoretically it's not needed.

Thanks
Aaron Moss
www.IndustrialHobbies.com




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Lance Hopper"
<snaggletto@c...> wrote:

> Test yourself, see how good you really are...
>
> Given; a ratcheting action, rotary tool turret with 8 positions (a
> tool every 45 degrees). The turret can only index going one

direction.

>
> Given; a series of 4 optical sensors, spaced evenly @ 90 degrees
> around a circle.
>
> Given; a "C" shaped, semi-circular raised area that passes thru and
> blocks/unblocks the optical sensors as it rotates with the tool
> turret. This creates 2 state change areas for each of the 4
> sensors. Assuming the "C" shape, and CCW motion, you can see that
> each of the 4 sensors will go from blocked to unblocked, and
> unblocked to blocked as the turret rotates.
>
> Problem; how many degrees is the opening of the semi-circular "C"
> shape that will create an off - on and on - off transition for each
> of the 4 sensors. Resulting in an index resolution of 45 degrees
> when only looking at one sensor at a time.
>
>
> This is easier than it first appears, however, I never could figure
> it out without help. I thought this might be an interesting
> challenge for others. See what you come up with. Good luck.