The ‘Lift or Elevator Algorithm’ is one of the common choices of system used in hard disc drive controllers to decide how to order the requests for data that arrive. Rather than just responding in chronological order they typically use the Lift Algorithm to in effect sweep the head from inner to outer tracks (cylinders) and back again. This reduces the wear compared to randomly jumping between tracks.
@@ZZ9ProductionsOFFICIAL FYI - Part 2 is tonight! (20-09-2019) @8PM GMT to chat to me (if you want), then @9PM to see the video. Link is here, but I'll activate it later: th-cam.com/video/oY1QlCqWOss/w-d-xo.html
I learned how to do some basic stuff on Otis elevators around 1979-1980, both manually operated and automatic by watching the repair guy. One day on my shift in the building a passenger elevator got stuck between floors, it was loaded, I was able to bring it up to the floor and open the doors from the motor room and floor selector. When I lived in Brooklyn and had to move out of the 6 story building I was in, the power had been cut off and I had 25 tons of sculptures to move out, I was able to move the elevator up and down without power but it took 7 flights of stairs for every trip to do it as the motor room was on the roof. I used a crow bar to release the brake shoes from the drum with the elevator loaded, and since that was heavier than the counterweight the car slowly decended. It was not easy peering down thru the grating into the dark shaft to try to tell when the car was at the ground floor even with a flashlight laid on the floor, but it did work. Empty car was lighter than the couterweight so releasing the brake shoes let the car come back up. I had wished I could have found a small elevator motor assembly, those older ones were very cool, I would have taken one home for my collection but they are heavy cast-iron buggers! I did get and still have one of the double ball fly governors, it weighs about 90 pounds alone.
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Very awesome video. I just came into possession of two 1962 Otis selectors from a 5-story dorm and about 95% of the guts from the two relay control racks. I have enough good parts to build a motor powered simulator using one selector, a reversible gear motor, and the relays. Should be fun project when I get started on it! Your video is going to be a handy reference!
@@mrmattandmrchay Yes, I'll be documenting the process with videos. My plan is to have two panels, one representing the lamps and buttons in the car, and another representing the lamps call buttons on the floors. The selector and relays will be mounted between them. The controller will operate a reversible gear motor that runs the selector carriage up and down, to make the simulation function. It will be quite a site to see when operating. Until then I have to work on putting humpty dumpty back together again. The selectors are in one piece, but the controller parts were removed by the installers using a sawzall to remove the components, I will have to reconstruct or make new mountings for all the relays. I did not get the controller rack cabinets themselves. Even disassembled they were large and too heavy to handle, I will make my own versions of those as well. A lot to do, but this may end up being the only working relay logic Otis controller left operating in North America when I am done, so I feel the effort is well justified.
Spectacular video! This gives me a good in depth understanding of how the 1960s OTIS’ are controlled via relays. I love when I’m in a 60’s OTIS and I hear a few relays click and then the lift motor powers up. Anyway, like I said earlier spectacular video Mrmatt!!
FYI - Part 2 is tonight! (20-09-2019) @8PM GMT to chat to me (if you want), then @9PM to see the video. Link is here, but I'll activate it later: th-cam.com/video/oY1QlCqWOss/w-d-xo.html
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Great video I have found the same logic in out 2004 gen2 at work. There is 4 landing calls but all only have a single down button other then the ground where it has a up call. Is this a program error from otis? As the mid floors should just be generic call.
Just curious if you know anything about the Otis Autotronic model. Not sure if they were common in the UK but here in the US they were. They were billed as continuous operation or “timed” cars. Signs on call switches would say press to “stop” elevator not press to “call”. They also often used touched sensitive buttons. I grew up around a lot of these and sadly not many left.
There is an old Otis in a tower block in hove and is relay controlled. And the motor is at the bottom of the shafts so you would need a drop key to get to see the motor in detail but the relay logic is at the top floor and requires a screwdriver to access. Pls film this lift. It's at shanklid court in hangleton
Matt please go to Brighton! There is a tiny little old single speed 1950's 1st gen Express lift @ Heals, and some Waygood Otis lifts @ the Old Ship Hotel which is nearby!
FYI - Part 2 is tonight! (20-09-2019) @8PM GMT to chat to me (if you want), then @9PM to see the video. Link is here, but I'll activate it later: th-cam.com/video/oY1QlCqWOss/w-d-xo.html
Does anyone know how I can find a local technician that understands this relay logic? I need someone that understands and can troubleshoot an old otis system.
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My apartment elevator is just like this except computer controller instead! I hate when people go into the elevator not paying attention to the call button
I did it with a ladder logic on an Allen Bradley PLC and it is far from simple. Actually, this is one of the hardest programs in a professional course where Boolean logic is used with 0s and 1s, which in reality is a proper AI.
Good question! When I get time to finish the editing! The animation and voice over is 95% complete, just need to put it all together. I expect within a week, but I'm on a 12 hour flight in a few days so I'm going to "try" and finish it then.
I have an answer now - it's finished. I'm going to premiere it this Friday at 8pm I think. I will be uploading a video in between this with more details.
Oh, and the 12 hour flight from Hong Kong - because I hardly slept the day before and this was a night flight, I was absolutely shattered and couldn't even think about turning on the laptop to edit! So this video was delayed a bit!
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Wow thanks James :) :) i never knew I would get so many people liking my channel. Tell me more about yourself...? Your age (I guess...9? Am I correct ?) And your interests. Ok...about me... 47 years old. Chay is 15. My interests... old lift and sirens obviously haha. My job is with security systems... we install access control mainly, cctv, intruder and some fire alarms. My job is to train engineers on the systems we use and visit sites to set up technical projects. Ok... your turn ;)
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Landing call are the buttons on the landings (floors) where you press the button to call the lift. Car calls are the floor buttons you press inside the lift, to select a floor.
It wil always head for the highest or lowest call, regardless of whether its a car or landing call. If the lift arrives at its last call and then afterwards a landing call is placed then you dont want the direction decided before you have even had a chance to enter the lift. Therefore landing calls are ignored for a while so the passenger sets the direction. With Express lift Co, the landing call button sets the direction upon arrival to the floor, if you press a call button in the OTHER direction then the lift will only change to that direction if there are no calls. E.g. indicated DN, then you get in and press a higher car call, if there is a landong call in downward direction then it will serve that first. Otis arrives at a destination without a set direction.
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Mr. Matt I just realize something. In the United States meter is spelled like this, M.E.T.E.R., But in the United Kingdom it’s spelled like this, M.E.T.R.E.
Criticisms, but I don't see any better content on your channel, or any content to be exact. When YOU have some videos on your channel then you can choose how to present them and how long to make them. Until then, I have good reasons why this video is what it is, which I don't feel I need to justify here.
Thanks) Now I have to find a way to explain this to a stupid girls in russian shopping malls who wastes everybody time pressing both up and down call buttons at the same time...
The ‘Lift or Elevator Algorithm’ is one of the common choices of system used in hard disc drive controllers to decide how to order the requests for data that arrive. Rather than just responding in chronological order they typically use the Lift Algorithm to in effect sweep the head from inner to outer tracks (cylinders) and back again. This reduces the wear compared to randomly jumping between tracks.
The effort you put into your videos is amazing.
Thanks Leon :)
mrmattandmrchay hi, video exporting. Length just over 10 minutes of 1080p 60
I agree with that, all the time spent editing, i couldn't even begin to imagine trying that myself XD
@@ZZ9ProductionsOFFICIAL FYI - Part 2 is tonight! (20-09-2019) @8PM GMT to chat to me (if you want), then @9PM to see the video. Link is here, but I'll activate it later: th-cam.com/video/oY1QlCqWOss/w-d-xo.html
I learned how to do some basic stuff on Otis elevators around 1979-1980, both manually operated and automatic by watching the repair guy. One day on my shift in the building a passenger elevator got stuck between floors, it was loaded, I was able to bring it up to the floor and open the doors from the motor room and floor selector.
When I lived in Brooklyn and had to move out of the 6 story building I was in, the power had been cut off and I had 25 tons of sculptures to move out, I was able to move the elevator up and down without power but it took 7 flights of stairs for every trip to do it as the motor room was on the roof. I used a crow bar to release the brake shoes from the drum with the elevator loaded, and since that was heavier than the counterweight the car slowly decended. It was not easy peering down thru the grating into the dark shaft to try to tell when the car was at the ground floor even with a flashlight laid on the floor, but it did work.
Empty car was lighter than the couterweight so releasing the brake shoes let the car come back up.
I had wished I could have found a small elevator motor assembly, those older ones were very cool, I would have taken one home for my collection but they are heavy cast-iron buggers!
I did get and still have one of the double ball fly governors, it weighs about 90 pounds alone.
I cannot believe the amount of effort put into this!
I absolutely love it!
Cool, thanks! Part 2 is even better - coming this Friday
@@mrmattandmrchay I cannot wait as the effort put in is amazing!
@@LiftInspector FYI - Part 2 is tonight! (20-09-2019) @8PM GMT to chat to me (if you want), then @9PM to see the video. Link is here, but I'll activate it later: th-cam.com/video/oY1QlCqWOss/w-d-xo.html
Very awesome video. I just came into possession of two 1962 Otis selectors from a 5-story dorm and about 95% of the guts from the two relay control racks. I have enough good parts to build a motor powered simulator using one selector, a reversible gear motor, and the relays. Should be fun project when I get started on it! Your video is going to be a handy reference!
Sounds like a really cool project. You'll have to do a part by part project video like I did for the Isaac Lift Panel?
@@mrmattandmrchay Yes, I'll be documenting the process with videos.
My plan is to have two panels, one representing the lamps and buttons in the car, and another representing the lamps call buttons on the floors. The selector and relays will be mounted between them. The controller will operate a reversible gear motor that runs the selector carriage up and down, to make the simulation function. It will be quite a site to see when operating.
Until then I have to work on putting humpty dumpty back together again. The selectors are in one piece, but the controller parts were removed by the installers using a sawzall to remove the components, I will have to reconstruct or make new mountings for all the relays. I did not get the controller rack cabinets themselves. Even disassembled they were large and too heavy to handle, I will make my own versions of those as well.
A lot to do, but this may end up being the only working relay logic Otis controller left operating in North America when I am done, so I feel the effort is well justified.
Spectacular video! This gives me a good in depth understanding of how the 1960s OTIS’ are controlled via relays. I love when I’m in a 60’s OTIS and I hear a few relays click and then the lift motor powers up. Anyway, like I said earlier spectacular video Mrmatt!!
Thanks! Wait until you see part 2 - far more interesting in my opinion :)
Part 2 is this Friday
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Dude, I love your "elevator music" in the background! Also - great presentation! This was easy even for someone like me to follow. :)
Thanks David! Yeah glad you noticed the elevator music haha
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3:17 LOL. Nice vid. Looking for the second part.
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"yes hello elevator i would like to go down"
* elevator actually goes up, refuses to elaborate *
Very awesome! I love complex logic circuits like this!
Beautifully explained. ❤
How did you gain that much knowledge? This is next level awesome
This is the easy part 1! Part 2 is the "ohhhh I seeeee wow!" part :) thanks for the comment
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Great video I have found the same logic in out 2004 gen2 at work. There is 4 landing calls but all only have a single down button other then the ground where it has a up call. Is this a program error from otis? As the mid floors should just be generic call.
Can you tell which car door will open if both the car are free car and parked on home landing.
This is excellent! I could use this to explain to apprentices.
Just curious if you know anything about the Otis Autotronic model. Not sure if they were common in the UK but here in the US they were. They were billed as continuous operation or “timed” cars. Signs on call switches would say press to “stop” elevator not press to “call”. They also often used touched sensitive buttons. I grew up around a lot of these and sadly not many left.
There is an old Otis in a tower block in hove and is relay controlled. And the motor is at the bottom of the shafts so you would need a drop key to get to see the motor in detail but the relay logic is at the top floor and requires a screwdriver to access. Pls film this lift. It's at shanklid court in hangleton
It's at shanklin court in hangleton
заставка меня нереально прёт, дженка)))
Matt please go to Brighton! There is a tiny little old single speed 1950's 1st gen Express lift @ Heals, and some Waygood Otis lifts @ the Old Ship Hotel which is nearby!
Guess where I went today??! And guess when I read your message?? Answer - Today I went to Brighton, I read your message when I got back. SIGH!!!
mrmattandmrchay lol really?
right on time after dieselducy's stream
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Does anyone know how I can find a local technician that understands this relay logic? I need someone that understands and can troubleshoot an old otis system.
Very very nice Video! That's a nice and good explanation! Thank you
Thanks for the comment :)
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My apartment elevator is just like this except computer controller instead! I hate when people go into the elevator not paying attention to the call button
Hey. What is your opinnion on Otis 2000 VFs?
Hi, none at all I'm afraid. I'm more into older lifts. Anything from about 1995 onwards just get me from A to B ;)
I did it with a ladder logic on an Allen Bradley PLC and it is far from simple. Actually, this is one of the hardest programs in a professional course where Boolean logic is used with 0s and 1s, which in reality is a proper AI.
When will part 2 be available.
Good question! When I get time to finish the editing! The animation and voice over is 95% complete, just need to put it all together. I expect within a week, but I'm on a 12 hour flight in a few days so I'm going to "try" and finish it then.
I have an answer now - it's finished. I'm going to premiere it this Friday at 8pm I think. I will be uploading a video in between this with more details.
Oh, and the 12 hour flight from Hong Kong - because I hardly slept the day before and this was a night flight, I was absolutely shattered and couldn't even think about turning on the laptop to edit! So this video was delayed a bit!
FYI - Part 2 is tonight! (20-09-2019) @8PM GMT to chat to me (if you want), then @9PM to see the video. Link is here, but I'll activate it later: th-cam.com/video/oY1QlCqWOss/w-d-xo.html
1:00 how many volts does the relay need to switch on?
These are 100-120volt relays.
i got mine working on 240v dc ( single diode rectifier ) I'm in Australia btw @@mrmattandmrchay
Where did you get that relay?
You are my favourite youtuber
Wow thanks James :) :) i never knew I would get so many people liking my channel. Tell me more about yourself...? Your age (I guess...9? Am I correct ?) And your interests. Ok...about me... 47 years old. Chay is 15. My interests... old lift and sirens obviously haha. My job is with security systems... we install access control mainly, cctv, intruder and some fire alarms. My job is to train engineers on the systems we use and visit sites to set up technical projects. Ok... your turn ;)
FYI - Part 2 is tonight! (20-09-2019) @8PM GMT to chat to me (if you want), then @9PM to see the video. Link is here, but I'll activate it later: th-cam.com/video/oY1QlCqWOss/w-d-xo.html
What is landing and car call exactly?
Landing call are the buttons on the landings (floors) where you press the button to call the lift.
Car calls are the floor buttons you press inside the lift, to select a floor.
It looks like the Otis design gives preference to car calls over landing calls.
It wil always head for the highest or lowest call, regardless of whether its a car or landing call. If the lift arrives at its last call and then afterwards a landing call is placed then you dont want the direction decided before you have even had a chance to enter the lift. Therefore landing calls are ignored for a while so the passenger sets the direction. With Express lift Co, the landing call button sets the direction upon arrival to the floor, if you press a call button in the OTHER direction then the lift will only change to that direction if there are no calls. E.g. indicated DN, then you get in and press a higher car call, if there is a landong call in downward direction then it will serve that first. Otis arrives at a destination without a set direction.
You can't program a transistor either. Transistors and relays are functionally identical, though electrically different
2nd! Nice video! Edit: Very interesting! Looking forward to part 2!
Thanks Michal
@@mrmattandmrchay Any time Matt, any time.
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Good animations!
thanks :)
Can you make More of this explain Videos?
Part 2 is coming up this Friday :)
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Mr. Matt I just realize something. In the United States meter is spelled like this, M.E.T.E.R., But in the United Kingdom it’s spelled like this, M.E.T.R.E.
Yep... correct :)
I want to see part two of the Old Otis System Lift as a duplex.
awesome
Instructions unclear: became dictator of Rwanda... help
Whos here for Tony Tong's Class?
Shut up
Hi, I'm intrigued - did someone feature my video in a class? If so, that's cool :) Pls let me know.
@@mrmattandmrchay Yeah our OS Teacher had a project to create an Elevator Scheduling algorithm and he linked us this video as an example
video starts late, ends early, and for its length is needlessly split into multiple videos. Almost like an OTIS lift call being handled.
Criticisms, but I don't see any better content on your channel, or any content to be exact. When YOU have some videos on your channel then you can choose how to present them and how long to make them. Until then, I have good reasons why this video is what it is, which I don't feel I need to justify here.
Cool
Thanks) Now I have to find a way to explain this to a stupid girls in russian shopping malls who wastes everybody time pressing both up and down call buttons at the same time...
And now we have Generic stuff like Lester :(
hello
Hi
Hi
Biner logic