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[nubdwarf]

So I was trying to made a goblin grinder at the entrance to my fortress
like this
-D-    D = Door
I^ I   I / - = Wall
I   I  ^ pressure plate connected to door
I^ I
-D-

just a little longer, haven't built the traps yet.
my dwarfs are getting stuck in it and I can't figure out why...
Ive got the plates set to 'Citizens do not trigger' and yet its acting like they do
this is the first time Ive really ever incorporated pressure plates into my defense
I need some help here...

[Sphalerite]

First, when a door is controlled by a pressure plate, it can only be opened by triggering the pressure plate.  So once your doors were linked, they were effectively locked until triggered to open.

Second, a trigger signal from a pressure plate will cause an attached door to open, not close.  Your doors will be closed until something steps on the pressure plate, at which point they will open.  When the creature steps off the pressure plate, the door will wait 100 frames and then close.  No, you can't easily reverse this action.

This is why goblin grinder traps use floor hatches over holes in the floor, not doors.  The floor hatch will be 'closed', providing an apparent path, until something steps on the pressure plate, at which point it will instantly open and break the path.

[nubdwarf]

I think it could still work with doors set up like this then
I^I
IDI
I  I
IDI
I^I

[Sphalerite]

Why would you possibly think that would work?  The doors will be closed by default.  Nothing will attempt to path through the doors, because they are closed and block traffic.  If an invading goblin happens by chance to step on one of the pressure plate, it may open the connected door, but the other door will still be closed, blocking traffic.  And if something somehow got into the middle, it will be stuck there forever by the closed doors.

[nubdwarf]

I see now

[Urist Imiknorris]

Use hatches over channels instead of doors in your first design, and all your problems will be solved. Just make sure to remove the ramps left by channeling.

[Brandstone]

I think it could still work with doors set up like this then
I^I
IDI
I  I
IDI
I^I

If you link both doors to the plate and remove the walls around the plate, will a goblin decide to take the short path instead and lock himself in?

[Dorf3000]

I think it could still work with doors set up like this then
I^I
IDI
I  I
IDI
I^I

If you link both doors to the plate and remove the walls around the plate, will a goblin decide to take the short path instead and lock himself in?

If it's locked at the beginning then no creature will try to walk down it.  If you want to use doors and pressure plates, then try this:

Code: [Select]

### ###
MMD^DMM
MMD^DMM
### ###
The goblin walks north or south through the gap, triggering the plates which opens the door.. Guess what's behind the door?

Magma Surprise!!

[Barrow]

If you link both doors to the plate and remove the walls around the plate, will a goblin decide to take the short path instead and lock himself in?

Once a path has been calculated, I don't believe it will be recalculated unless the path becomes blocked, so no. It's like setting up different traffic patterns once a dwarf has started pathing; he'll happily tromp through a restricted area until he's stopped (reached his destination or lost the path he was taking) and starts looking for a new route.

I could be wrong, however, as I don't usually use grinders.

[nubdwarf]

I like that Magma idea...
I just started my first fortress on the side of a volcano
I think I may give it a try...