THE CONTROL CIRCUIT FOR THE TV SYSTEM (V.A.U.D.)…
Recall that I’m going forward with the design of a fully powered system to open the TV door and push the TV out of its hole. The hand wheel cranks will be Plan B. Plan A is looking very hopeful at this point, however.
Here is the simple control circuit that will be used. One single pole double throw switch will control it. Activating the switch one way will open the door and then extend the TV bracket out. Activating it the other way will retract the bracket and close the door after it. Limit switches will sequence the events by sensing the extreme positions of the door and bracket. They contain normal open (NO) and normally closed (NC) contacts to allow this. (You EE's out there, please don’t beat me up too bad about the symbols used and whatnot - I know some of it is not exactly right but it is just something to help me think through the logic.) Color coding will be added when components are delivered so help out with the wiring/troubleshooting later.

The Sequence of Operation (starting with TV stored):
1- Shopnut decides to watch TV and pushes rocker switch
2- Roll-up door begins to open (Shopnut rejoices and a slight giggle is heard)
3- Door stops opening when “FULL UP” limit switch is tripped (Shopnut breathes a sign of relief)
4- Shopnut decides if the TV needs to extend out from recess. If so, he keeps holding rocker switch.
4- Same door limit switch diverts power to start extending TV (Shopnut is actually amazed it works)
5- TV continues extending straight out from its recess (Shopnut swears he hears the sound of heaven's gates opening)
6- When mechanical stop is reached on right side, TV starts swiveling to left (assuming Shopnut is still holding rocker switch)
7- “FULL OUT” limit switch is tripped when bracket is extended fully. (If limit switch fails and Shopnut does not notice in time, 3500lb jack rips bracket from wall and TV crashes to floor)
8- Shopnut enjoys TV viewing from nearly all locations in shop.
9- Process is reversed to store TV during dusty shop activities. “FULL IN” and “FULL DOWN” limit switches control motors in this sequence.
I'm a little bummed though. I bought the limit switches in haste without fully reading the spec sheet. Their rating was 5 amps, which is plenty for the motor I ordered. But that was the resistive load rating. Upon closer look, they only have a 2 amp rating for a motor load, and that is marginal for this application. Worst case, I guess I can add relays or seek out higher rated switches.

The gear motors arrived and they are really cool. No sign of the switches yet, however, but I'll report on both when they show up.
Recall that I’m going forward with the design of a fully powered system to open the TV door and push the TV out of its hole. The hand wheel cranks will be Plan B. Plan A is looking very hopeful at this point, however.
Here is the simple control circuit that will be used. One single pole double throw switch will control it. Activating the switch one way will open the door and then extend the TV bracket out. Activating it the other way will retract the bracket and close the door after it. Limit switches will sequence the events by sensing the extreme positions of the door and bracket. They contain normal open (NO) and normally closed (NC) contacts to allow this. (You EE's out there, please don’t beat me up too bad about the symbols used and whatnot - I know some of it is not exactly right but it is just something to help me think through the logic.) Color coding will be added when components are delivered so help out with the wiring/troubleshooting later.

The Sequence of Operation (starting with TV stored):
1- Shopnut decides to watch TV and pushes rocker switch
2- Roll-up door begins to open (Shopnut rejoices and a slight giggle is heard)
3- Door stops opening when “FULL UP” limit switch is tripped (Shopnut breathes a sign of relief)
4- Shopnut decides if the TV needs to extend out from recess. If so, he keeps holding rocker switch.
4- Same door limit switch diverts power to start extending TV (Shopnut is actually amazed it works)
5- TV continues extending straight out from its recess (Shopnut swears he hears the sound of heaven's gates opening)
6- When mechanical stop is reached on right side, TV starts swiveling to left (assuming Shopnut is still holding rocker switch)
7- “FULL OUT” limit switch is tripped when bracket is extended fully. (If limit switch fails and Shopnut does not notice in time, 3500lb jack rips bracket from wall and TV crashes to floor)
8- Shopnut enjoys TV viewing from nearly all locations in shop.
9- Process is reversed to store TV during dusty shop activities. “FULL IN” and “FULL DOWN” limit switches control motors in this sequence.
I'm a little bummed though. I bought the limit switches in haste without fully reading the spec sheet. Their rating was 5 amps, which is plenty for the motor I ordered. But that was the resistive load rating. Upon closer look, they only have a 2 amp rating for a motor load, and that is marginal for this application. Worst case, I guess I can add relays or seek out higher rated switches.

The gear motors arrived and they are really cool. No sign of the switches yet, however, but I'll report on both when they show up.
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The hood is mostly sheet metal, but the front grill is plastic and that’s where the hinges attach - not the greatest design. This tractor is over ten years old so I guess the plastic was getting brittle. 






don't get along; you may have to resort to obtaining an actual POD from '2001 - A Space Odyssey' to use whenever you're puttering around the Asylum! Wouldn't that be cool, zipping around the shop, tucked away safely in the padded cocoon of the POD, reclining comfortably in your Recaro lounger and using the servo-driven manipulators to do all your work, keeping you safe and secure from that nasty 'Gravity'! 





















