Reed Switches
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 BROOKS REED SWITCH ALARM 1020CPP19F1AB NNB  US $500.00
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 new MICRO SWITCH 20FR4 6B MAGNETIC ACTUATED REED SWITCH US $350.00
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 Magnetic Reed Switches x 1000 LED UK Low Price reed switch x1000 US $347.75
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 1 BOX 100 SWITCH REED Hamlin ELP HURRY BIG SALE US $274.00
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 3 NEW COMPACT AIR REED SWITCHES AWHE 10 US $270.00
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 Lot 100 Hanmlin MDRC 4 magnetic reed switch 27 32 US $250.00
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 GEMS WARRICK FEB8B REED FLOAT SWITCH 6 84 US $225.32
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 KELLEY 184484 FIELD INSTALLED REED SWITCH KIT 184 483 US $205.00
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 SQUARE D 9007 C86L REED SWITCH 9007C86L SER A NIB US $200.00
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 100 sets Reed Switch 5047 Com NC 33x15x8mm Taiwan US $168.50
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 SQUARE D 9007 C86L REED SWITCH 9007C86L SER A NEW US $150.00
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 1 NEW SCHRADER BELLOWS 007124000 REED SWITCH Q4 5 US $139.99
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 NEW FIELD INSTALLED REED SWITCH KIT 184483 US $129.99
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 5 BIMBA MRS 087 PBLQC 31 REED SWITCH CABLE NEW US $125.00
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 4 NEW FESTO REED SWITCHES SME 1 LED 24 US $124.00
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 Reed SwitchGlass N OLow voltage current FS56 300pcs US $123.37
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 BIMBA MAGNETIC REED SWITCH AIR CYLINDER US $120.00
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 SQUARE D MINIATURE ENCLOSED REED SWITCH 9007 XA7306DC NEW IN BOX US $120.00
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 Reed SwitchGlass N OLow voltage current10110×300pcs US $114.17
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 50 pairs Reed Switch 5046 W Com NC NO 65x13x13mm Guard US $113.50
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 50pairs Reed Switch 5046 BR Com NC NO 65x13x13mm Guard US $113.50
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 Reed SwitchGlass N OLow voltage current14103×300pcs US $109.20
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 Reed Switch Glass N O Low voltage current 5E 80pcs US $107.16
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 Reed SwitchGlass N OLow voltage current1555Golden×80 US $106.68
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 Reed Switch Glass N O Low voltage current 5H 80pcs US $106.68
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 Reed SwitchGlass N OLow voltage current1555White X80 US $103.92
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 CANFIELD 810 000 04 REED SWITCH LOT 810000004 US $100.00
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 25 Therm O Disc Temperature Sensing Reed Switch Probe US $99.95
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 LOT 4 TATSUTA REED SENSOR SWITCH LED 2 WIRE ZC205 NEW US $99.00
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 PARKER SMC 1NC POSITION SENSOR REED SWITCH PKG OF 2 SWITCHES US $98.00
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 CUTLER HAMMER D40RPH LATCHING REED SWITCH MOD 3A 300VAC US $89.90
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 De Sta Co 810 156 cylinder Reed Switch 9 foot lead US $89.50
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 SQUARE D MINATURE ENCLOSED REED SWITCH 9007 XA7306E US $89.00
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 NEW DE STA CO TOOLS REED SWITCH 810151 US $85.99
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 SMC NCDY2S15H 1300 A73 Pneumatic Actuator Reed Switch US $82.99
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 SENSING MAGNET ACUATED REED SWITCH US $80.00
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 PHD INC JC1SDP K REED SWITCH NEW US $79.99
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 SMC D F59 D F5PW D F59W D F79 D F79W D F7PW Reed Switches Lot Of 8 US $79.99
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 BIMBA MRS 087 XBL Magnetic Reed Switch LOT of 8 bonus US $79.99
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 BIMBA HSCQCX 04 REED SWITCH PNP QUICK DISCONNECT US $79.95
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 Lot of 4 Numatics Reed Switch SR6 004 NIP 6821 US $79.00
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 SMC D Y7BW 2 Color 24VDC Reed Switch Lot Of 7 US $78.99
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 Reed Switch Glass N OLow voltage currentCOTO 20 X150 US $78.48
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 NIB SQAURE D 9007XA7309E MINIATURE REED SWITCH US $75.95
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 Reed SwitchGlass N OLow voltage current1555White ×50 US $75.90
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 Reed SwitchGlass N OLow voltage currentFS56 ×200pcs US $75.90
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 Reed SwitchGlass N OLow voltage current14103 ×250pcs US $75.90
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 Reed Switch Glass N O Low voltage current 5Z 50pcs US $75.90
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 Reed Switch Glass N O Low voltage current10110 ×200 US $75.90
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 Reed Switch Glass N O Low voltage current 5H 50pcs US $75.90
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 Reed SwitchGlass N OLow voltage current1555Golden×50 US $75.90
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 Reed SwitchGlass N OLow voltage currentCOTO ×150pcs US $75.90
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 SQUARE D MINIATURE ENCLOSED REED SWITCH 78379 US $75.00
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 Bimba SS MRS 0414 DXPZ RF With 2 Magnetic Reed Switch MRS 027 US $75.00
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 KOGANEI CYLINDER REED SWITCH CS11TB NEW CS11TB US $75.00
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 3 BIMBA MRS 087 PBLQCX REED SWITCH NEW US $75.00
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 3 BIMBA MRS 087 PBLQCX DW3 REED SWITCH NEW US $75.00
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 SUNX LTD EX 13EP REED SWITCH EX 13EAD PHOTOELECTRIC US $69.99
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 2 NEW KOGANEI CYLINDER REED SWITCHES MODEL CS4MB US $69.99
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 FABCO AIR Pre Wired Cylinder Reed Switches 9 2A197 1004 US $69.99
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 BROOKS INSTRUMENTS MODEL 351 HIGH FREQUENCY PULSE GENERATOR W REED SWITCH 46849 US $69.99
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 1 NEW MILLER 060RSB02150R4 REED SWITCH KIT NIB US $69.99
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 Destaco Reed Switch 810 154 NIP 3044 US $68.99
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 Microswitch 50FR2 3 Reed Switch Micro NEW US $67.99
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 SCHMERSAL BNS250 12Z MAGNETIC CODED REED SWITCH W BPS250 MAGNETIC SENSOR US $66.99
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 MICRO SWITCH 20FR1 6B MAGNET ACTUATED REED SWITCH NEW US $65.00
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 Square D Enclosed Reed Limit Switch XA7509DC US $64.99
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 3 PHD GRIPPER CABLE sensor reed switch NEW US $64.00
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 Numatics Reed Switch NC 120VAC DC 20VA 1A NEW US $62.99
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 Bimba SS MRS 029 DXPZ SA With 2 Magnetic Reed Switch MRS 027 US $60.00
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 REID TOOL SUPPLY REED SWITCH TC 810151 NEW US $60.00
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 MICROSWITCH MAGNET ACTUATED REED SWITCH 20FR4 6B 125 250 VAC US $60.00
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 2 SMC D F5P SWITCH REED SENSOR NEW US $60.00
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 7 SMC D G59 Reed Switch 1 D G5P US $60.00
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 Micro Switch FMBD Reed Relay US $59.99
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 Taiyo AX115CE Reed Switch 5 30VDC 165 Ft NEW US $59.99
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 Nice Square D Mini Reed Limit Switch 9007 XA7309D US $59.99
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 CUTLER HAMMER D40RPB REED SWITCH MODULE 1 NC 3A 300VAC US $59.90
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Tips on Air Cylinders
What do you need to know to select the right air cylinder from the huge variety available in the industrial marketplace? Here is the answer.
How much force do you need to move the object you wish to move?
You'll need to know the weight of the object. Consider what the object being moved is sliding and know that this friction is adding to the load.
Oversize the required force of the cylinder by 25% to take into account friction of the rod and piston seals within the air cylinder itself, and also allowing a safety margin as it relates to the expected load the cylinder will see.
Know your available air pressure (example: 90 PSI) and multiply that times the surface area of the piston inside the cylinder to get the theoretical output force of the cylinder.
If you multiply 3.14 x the radius - in inches -squared this equals the surface area of the piston in square inches.
Since cylinders only come in certain bore sizes, default to the standard cylinder bore that's the next size up if none are exactly the bore diameter calculated. Note that the size of the outside of the cylinder on some types has no real bearing on what the piston diameter inside the cylinder is.
How far do you wish to move the object?
If you wish to move the object five inches, it's logical to think that the cylinder piston / rod travel needs to be five inches. It could be that simple. It might not be. Take into account the size of the object that's to be moved to be sure that the object itself doesn't impact on the cylinder rod cap on retract.
You may wish to consider a cylinder with a longer stroke than required so that the piston of the cylinder can be stopped inside the barrel by having the object itself stop the movement. This stops the piston from "bottoming out" on either cap of the cylinder itself. Depending on the cycle speed, this may increase cylinder life.
Take into account how you are connecting your load to the cylinder rod. If using a clevis of some sort, take that dimension into account.
Regardless of what is attached to the end of the rod, the rod itself can only move the distance that the piston inside the cylinder can move. That's all the stroke distance you have to work with.
How will you attach your object to the cylinder rod?
Careful, if you screw the object onto the rod thread directly. Make sure that the "load" and the rod are aligned.
A rod clevis is a "sloppy" connector that screws onto the end of the rod thread. Bolt the other half to your object, and the two halves are connected in the center via a cotter pin of sorts.
This "sloppy" type of connector forgives some misalignment between the rod travel and the object movement for if the object is too far off the axis of the rod, you will very quickly encounter problems with the air cylinder.
There are alignment couplers commercially available that will further absorb misalignment between load and rod. For extreme misalignment cases, the load can be installed on rods external to the cylinder, removing almost all side-load from the rod itself.
Note that there are standards in rod thread size which change depending on the bore size of the cylinder.
Further, the rods themselves can be modified to reduce the size of the thread, to change the type of thread, to make the rod end a female thread, or to replace the standard rod thread with a stud that can, if the stud breaks, be removed and replaced at minimal cost to parts and downtime.
How will you attach the cylinder to your machine?
Depending on the type and size of cylinder there are many options of unique and standard mounts.
Most cylinders come with integral mounting of some sort, whether it's a rod-cap thread, a rear-cap thread, a rear tang for a clevis mount, threaded holes into which bolts can be turned, front or rear flanges, trunnion mounts...and so on. It depends on the type of cylinder.
Remember, if the load that's being moved is not aligned with the rod travel, you will have problems. Therefore, the type and location of load will help determine the type of cylinder mount too.
What type of cylinder?
Some choices are:
· repairable air cylinders or "throw-away" non-repairable types
· NFPA cylinders (north American standard) or ISO cylinders (European standard)
· aluminum, steel, stainless steel, composite construction
· steel rod, stainless steel rod, chromed rod
Usually, as the bore size of the cylinder gets larger the style opted for is a repairable type, as more money will be spent on acquiring the cylinder therefore the cost for repair becomes a smaller percentage of the overall cost. It's hard to get excited about trying to fix a $80.00 cylinder when the parts cost $30.00 and it will take a worker two hours to fix it. On the other hand, if the cylinder costs $500.00 - a different story.
As the bore size of the cylinder changes, so too will the rod diameter and rod threads, and the port sizes.
NFPA cylinders are imperial dimensions and imperial threads, ISO cylinders are metric dimensions and threads.
You need to consider the conditions into which the cylinder will be installed to determine if you need specialty materials in their construction. Also, specialty seals may be required in corrosive, low or high heat environments.
Cushions?
As referred to earlier, if you can avoid stopping the cylinder by having the piston "bottom out" inside the barrel, good. This will increase cylinder life. If this isn't practical, your cylinder caps can usually have cushion vents installed which, when adjusted, trap and slow the exhaust of a small amount of air from inside the cylinder as the piston reaches end of stroke. This provides a cushion to lessen the impact of the piston to the end cap.
Where is it?
If the application requires knowledge of load position, proximity sensing devices can usually be added to the barrel of the cylinder. They will "make" when a magnet on the piston inside the cylinder passes them. Since the distance from the magnet to end-of-rod is known, this will locate the load.
There are a variety of position sensing options for cylinders including reed switches, hall effect switches, linear potentiometers, or you can elect to sense the position of the load itself by using a barrel proximity switch mounted so that the switch "makes" as the load itself arrives.
If you need position sensing, make sure the cylinder you choose has that capability both in terms of magnets on the piston, and external mounts for the switch itself.
And there you have it - six steps to finding the right cylinder. Good luck in your hunt.
About the Author
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How can you build a simpe DC Motor?
I have an assignment to buil d a motor that works, but I can't use any reed switches, permanent magnets or any copper coils. Can anyone help me with it? Any instructions online or anything?
have an assignment to build a motor that works, but I can't use any reed switches, permanent magnets or any copper coils. Can anyone help me with it? Any instructions online or anything?
EDIT: It has to work on a 6V or 9V battery (can't remember) No compressed air motors 
The only method I can think of is an electrostatic motor, something like this:
http://amasci.com/emotor/emot1.html
But you would also have to convert your low battery voltage into a high voltage supply, which is also described on links in the above page.
How a Reed Switch Works
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