Limit switch - Wikipedia, the free encyclopedia

September 6, 2013 – 11:09
Solar tracker circuit

In electrical engineering a limit switch is a switch operated by the motion of a machine part or presence of an object. They are used for control of a machine, as safety interlocks, or to count objects passing a point. [1] A limit switch is an electromechanical device that consists of an actuator mechanically linked to a set of contacts. When an object comes into contact with the actuator, the device operates the contacts to make or break an electrical connection. Limit switches are used in a variety of applications and environments because of their ruggedness, ease of installation, and reliability of operation. They can determine the presence or absence, passing, positioning, and end of travel of an object. They were first used to define the limit of travel of an object; hence the name “Limit Switch.”

Standardized limit switches are industrial control components manufactured with a variety of operator types, including lever, roller plunger, and whisker type. Limit switches may be directly mechanically operated by the motion of the operating lever. A reed switch may be used to indicate proximity of a magnet mounted on some moving part. Proximity switches operate by the disturbance of an electromagnetic field, by capacitance, or by sensing a magnetic field.

Rarely, a final operating device such as a lamp or solenoid valve will be directly controlled by the contacts of an industrial limit switch, but more typically the limit switch will be wired through a control relay, a motor contactor control circuit, or as an input to a programmable logic controller.

Miniature snap-action switch may be used for example as components of such devices as photocopiers or computer printers, to ensure internal components are in the correct position for operation and to prevent operation when access doors are opened. A set of adjustable limit switches are installed on a garage door opener to shut off the motor when the door has reached the fully raised or fully lowered position. A numerical control machine such as a lathe will have limit switches to identify maximum limits for machine parts or to provide a known reference point for incremental motions.

Source: en.wikipedia.org

Amico Amico ME-8169 Wobble Coil Spring Lever NO NC SPDT Mini Enclosed Limit Switch
Home Improvement (Amico)
  • Product Name: Limit Switch; Model No.: ME-8169; Actuator Type: Wobble Stick Lever
  • IP Rating: IP66; Power: AC 380V, 6(2)A; AC 250V, 10(4)A
  • Mounting Hole Diameter: 4.5mm / 0.18 ; Body Dimension: 88 x 28 x 25mm / 3.5 x 1.1 x 1 (L*W*T)
  • Lever Length: 85mm/3.3 ; Main Color: Blue, Gray, Black; Material: Plastic, Metal, Rubber
  • Weight: 58g; Package Content: 1 x Limit Switch

I got a behind the scenes tour of that place

2010-02-24 17:14:50 by bent_rider

Back in the 80's.
got to see the control system, control room, etc.
Also got a behind the scenes tour of the 'Star Wars' ride.
The theater you sit in is a jumbo jet flight simulator up on these enormous hydraulic actuators that make the theater move around.
Was way more interesting than the actual ride.

Whats your problem?

2009-04-03 11:41:11 by HiredHelp

You seem to take an abnormal amount of pleasure in telling other folks what they are and are not. I didnt ask for advice from you, I asked for job leads from the board.
In between the time I last posted and this post, I was offered a position as a supervisor, in a high tech petroleum company, making hydraulic manifolds for actuators that control the flow of petroleum through the lines. Not bad for a worthless guy, huh?
Just goes to show that not even you, The Almighty, knows everything. And as for the union comment, the only way I ever knew I was in a union was from the dues being deducted from my check

Keltron receives order worth Rs 2.44 crore  — The New Indian Express
The pneumatic actuators will be manufactured at the Keltron Controls division of Keltron at Aroor in Alappuzha district.

Semiconductor Processing Improves with FPGA-based Controller  — Automation World
The machine includes a rotary mechanism with pneumatic actuators to handle freshly diced wafers, which are identified by a gigabit Ethernet camera to position the stage to pick components of the freshly cut silicon with actuators.

Amico Amico ME-8108 Momentary Rotary Adjustable Roller Lever Arm Limit Switch
Home Improvement (Amico)
  • Product Name : Limit Switch;Model No. : ME-8108;Actuator Action : Momentary;Actuator Type : Rotary Adjustable Lever Arm with Roller
  • Contact Configuration : NC + NO;IP Rating : IP66;Voltage Rating : AC 250V 5A ;DC 115V 0.4A
  • Roller Dimension : ~1.8 x 0.7cm / 0.7 x 0.3 (D*H);Lever Arm Length : ~10cm / 3.9
  • Fixing Thread Diameter : ~0.4cm / 0.2 ;Total Size : ~12.3 x 5 x 2.8cm / 4.8 x 2 x 1.1 (L*W*H);Material : Resin, Plastic & Metal
  • Color : Blue, Gray & Black;Net Weight : 91g;Package Content : 1 x Limit Switch
uxcell SPDT Long Hinge Roller Lever Miniature Basic Switch
PC Accessory (uxcell)
  • Product Name: Micro Switch; Material: Plastic & Metal
  • Model No.: V-156-1C25
  • Actuator Type: Long Hinge Roller Lever
  • Rating: 15A, 1/2HP, 125/250VAC, 0.6A,125VDC; 0.3A, 250VDC
  • Switch Body Size: ~2.8 x 1 x 1.6cm / 1.1 x 0.39 x 0.63 (L*W*H)
uxcell Long Hinge Lever Actuator Limit Micro Switch Black 2 Pcs
Home Improvement (uxcell)
  • Actuator Type: Long Lever; Material: Plastic & Metal
  • Rated Load: 3A  250V AC, 5A 125V AC
  • Switch Body Size(Each): 2 x 1 x 0.6cm/0.78 x 0.4 x 0.2 (L*W*H)
  • Hole Diameter: 2mm / 0.07
  • Lever Size: 2.5 x 0.4cm/0.98 x 0.15 (L*W)
Amico Amico TZ-7311 Parallel Roller Plunger Actuator Momentary Micro Switch
Home Improvement (Amico)
  • Product Name : Limit Switch;Model No. : TZ-7311;Conact Configuration : 1NO,1NC(SPDT);Actuator Action : Momentary
  • Actuator Type : Parallel Roller Plunger;Ui : 380V;Ith : 10A;AC-15 : Ue: 250V, le: 1.5A
  • DC-13 : Ue: 220V, le: 0.3A;Switch Body Size : ~5.3 x 2.1 x 4cm / 2.1 x 0.8 x 1.6 (L*W*H);Fixing Holes Dia. : ~0.44cm / 0.17“;Distance Between Centers of Fixing Holes...
  • Thread Size : 1.17 x 1.7cm / 0.46 x 0.7 (D*L);Roller Size : 1.2 x 0.35cm / 0.5 x 0.14 (D*T);Actuator Height : 3.7cm / 1.5
  • Color : Grey, Black;Net Weight : 83g;Package Content : 1 x Limit Switch

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