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Editing User:Hussell/Repeater
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That last requirement may seem a little odd. Here's what you need to know: every turn, screw pumps attempt to pump water in the order ''opposite'' to the order they were built in. If a [[Screw_pump#Pumping_up_multiple_levels|pump stack]] is built from bottom to top, it will pump water one level per step. But if it's built from top to bottom, it will pump water from the bottom to the top in ''one step''. In particular, any pressure plates on the intermediate levels will ''not'' be activated. This is how this design gets around the fact that the lower screw pump continues to pump for 50 steps after the lower gear is deactivated. | That last requirement may seem a little odd. Here's what you need to know: every turn, screw pumps attempt to pump water in the order ''opposite'' to the order they were built in. If a [[Screw_pump#Pumping_up_multiple_levels|pump stack]] is built from bottom to top, it will pump water one level per step. But if it's built from top to bottom, it will pump water from the bottom to the top in ''one step''. In particular, any pressure plates on the intermediate levels will ''not'' be activated. This is how this design gets around the fact that the lower screw pump continues to pump for 50 steps after the lower gear is deactivated. | ||
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| + | You can check the order in which your screw pumps were built on the {{k|r}}ooms page. Just {{k|PgUp}} until you find the screw pumps, then check the last two on the list. If the lower screw pump isn't last on the list, just deconstruct and reconstruct it. | ||
Why is the plate 2-7? I use a pond zone to put water into the Z-level -1 pit. Screw pumps ignore 1/7 water, but pump 2/7 water completely, so 2 is the minimum amount of water needed to run this machine. Up to 7 will also work, but isn't required. More than 7 may cause spillage, depending on where the accessible spaces are. I have no idea what will happen if there's more than 7 water and no place for it to flow to, but the device will almost certainly malfunction. | Why is the plate 2-7? I use a pond zone to put water into the Z-level -1 pit. Screw pumps ignore 1/7 water, but pump 2/7 water completely, so 2 is the minimum amount of water needed to run this machine. Up to 7 will also work, but isn't required. More than 7 may cause spillage, depending on where the accessible spaces are. I have no idea what will happen if there's more than 7 water and no place for it to flow to, but the device will almost certainly malfunction. | ||
| − | + | Step 1: water in pit, lower gear active, hatch closed (CLOSE signal sent) | |
| − | + | Step 2: water on plate, lower gear active, hatch closed | |
| − | Step 1: water in pit, lower gear | ||
| − | Step 2: water on plate, lower gear active, hatch closed | ||
Step 3: water in shaft, lower gear inactive, hatch open (OPEN signal sent) | Step 3: water in shaft, lower gear inactive, hatch open (OPEN signal sent) | ||
Step 52: lower pump pumps nothing this step, water soon rests in pit | Step 52: lower pump pumps nothing this step, water soon rests in pit | ||
| − | Step | + | Step 103: water in pit, lower gear active, hatch closed (CLOSE signal sent) |
| − | Step | + | Step 104: water on plate, lower gear active, hatch closed |
| − | Step | + | Step 105: water in shaft, lower gear inactive, hatch open (OPEN signal sent) |
| − | So: a | + | So: a 102 step cycle. During 100 of these steps, the hatch is open and the lower gear is inactive. The CLOSE signal is sent at the beginning of the 101st step, the water is on the pressure plate during the 102nd step, and the OPEN signal is sent at the beginning of the 103rd step, which is also the first of the 100 steps during which the hatch is open. Although the lower gear is inactive for 100 steps, the lower pump continues pumping for 50 steps, but the water never touches the plate while the hatch is open if you've constructed the pumps in the correct order. |
| − | I believe this is the fastest repeater possible with pressure plates. Best of all, it doesn't require pressurized water, so there's no danger of flooding your fortress. There may be a simpler design, though. This one requires two screw pumps (2 blocks, 2 pipe sections/tubes, and 2 enormous corkscrews), two gears, a pressure plate, and two linkages (7 mechanisms), plus at least 2 mechanisms to link the output to something. 30 power plus however much is needed by the axle is required, so it could be powered by a single windmill, possibly on the surface directly above the upper gear. In any event, at least 3 logs will also be needed (for a waterwheel), and possibly more (4 for a windmill, plus some for axles). | + | I believe this is the fastest or almost the fastest repeater possible with pressure plates. Best of all, it doesn't require pressurized water, so there's no danger of flooding your fortress. There may be a simpler design, though. This one requires two screw pumps (2 blocks, 2 pipe sections/tubes, and 2 enormous corkscrews), two gears, a pressure plate, and two linkages (7 mechanisms), plus at least 2 mechanisms to link the output to something. 30 power plus however much is needed by the axle is required, so it could be powered by a single windmill, possibly on the surface directly above the upper gear. In any event, at least 3 logs will also be needed (for a waterwheel), and possibly more (4 for a windmill, plus some for axles). |