On Tue, 12 Feb 2013, dave wrote:
> Date: Tue, 12 Feb 2013 08:40:16 -0800
> From: dave <dengv...@charter.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: Re: [Emc-users] Cincinnati Arrow 500 retrofit...
>
> On Tue, 2013-02-12 at 10:16 -0600, Stuart Stevenson wrote:
>> Just one more scenario for fun.
>> The A and B axes hard limits on the cinci are wired to shut off the drive
>> when tripped. When an A or B hard limit is tripped and the drive is shut
>> off the head is tilted so far the weight causes the head to keep moving and
>> the pinion gear will drop off the end of the rack with an accompanying loud
>> clunk when the head drops to the frame. Recovery is fun.
>> On Feb 12, 2013 10:07 AM, "Pete Matos" <petefro...@gmail.com> wrote:
>>
>>> Well that may work fine for you and honestly I love soft limits as much as
>>> the next Guy but I honestly prefer to have the drives enabled in a limit
>>> switch trip situation so I can just backoff,backup and punt my way back
>>> into the program. It worked fine that way on my RF45. If I have my way I
>>> will have both hard and soft limits working continually and the estop
>>> shutting down the show in an emergency situation. So I appreciate all the
>>> ideas here but can we kinda keep the ideas pointing in that direction so my
>>> already befuddled mind does not get any more befuddled than it has to be.
>>> LOL thanks guys....peace
>>>
>>> Pete
>
> Stuart I must say you have an interesting take on 'fun'. ;-)
> No stop on the rack to prevent it spooling off?
>
> As for limits: I do mine a bit differently ( comes with the territory).
> All limit switches drive individual ice cube 4PDT relays which do the
> appropriate thing to the plus and minus inhibits. This leaves me the
> ability to slave anything I want off those relays and makes backing off
> easy. The relays also have an LED so I can tell at a glance what
> tripped. The estop chain includes a switch for each axis plus the big
> red button going to an ice-cube which enables/disables the power
> contactor. I also have manual inhibits for each axis. In an ideal world
> one would short the inputs to the drives to pull them to zero input then
> about 50 ms later kill the power.
>
> I suspect there are much easier ways to do all this but this works for
> me.
>
Dumping the servo/spindle DC bus into a braking resistor at Estop is not a bad
idea either
Peter Wallace
Mesa Electronics
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