I need a simple cable exercise machine with a high and low pulley only?
401670
http://www.fitness-equipment.com/acatalog/Fitness_Equipment_Portable_Doorway_Gym_Systems_187.html
60533
Try http://www.bowflex.ca/pdf/manual_ultimate.pdf#search='bowflex%20workout%20guide' for a .pdf version.
340213
www.billyblanks.com  for workout without machines\nwww.totalgym.com only if you are willing to buy it\n\nI have a total gym and it really is the best machine workout available. But if you are only interested in a body workout without using a machine I suggest Billy Blanks workout!
984338
I've had good luck with products from Lifeline USA.  I'd look at their portable Power Jumper.  No weights needed, and it comes with a guide to its use.
531203
prooly need ifrared thingy\ntry a industrial magnet
388533
You might wanna take a look at this:\n\nhttp://www.download.com/Best-Free-Software/1200-20-5154518.html?tag=fea_more
1074782
You can check some CNC controllers here\nhttp://www.controlafzar.com/products_en/controller_page.htm
68424
vasatrainer is one of the best \nthe website is in one of the other entries\nor you can simply purchase bungee cords and tie them around a pole and mimick the vasatrainer movements
482229
Have you considered a DC electric linear actuator? Lots of manufactures on the web such as http://www.dcactuators.com although there are others.
520392
It's possible that it doesn't have one.  My current laptop does not have one either.  Keep in mind that thin and light machines are usually made out of plastic or very light aluminum.  A strong tug would snap the cable slot very easily.  For better security, don't leave your laptop lying around.
388899
Bowflex is a good well rounded machine.  It's good for circuit training, but if you want a little more cardio and some variety, you should go to a gym where it's social and they have classes and treadmills, exercise bikes, etc...
615645
search \nMechatronics on google and you will get a lot of resources \nfew links\nwww.PMDcorp.com      High-precision single or multi-axis Includes user-friendly software\nStepper motor control?\nwww.teknic.com      Discussion of motion & I/O control: low-cost, reliable, easy expansion
1059639
look in switchboard.com
237092
Try www.switchboard.com
508125
That a vintage item, but I have read there coming back.\nThere called  Exercise Belt Vibrators\n\nhttp://www.fitness.com/fitness_exercise/v1031075218.php\n\nhttp://wantitnow.ebay.com/1960s-Exercise-Belt-Vibrator-in-Working-Condition_W0QQadidZ9513362176
590858
The smith machine.  Do lunges and squats.  Enough weight so you can feel it after 12 reps.  You will really work your glutes.
252925
The two simplest pulley systems demonstrate the principles of their operation.  First if there is a single pulley overhead and you pull down to lift a load, you must pull with the same force as the weight of the load because oonly one rope pulls up on the load.  100 pound load = 100 pound pull.\n\nSecond, if the load is below you and you pull up on a rope connected to your own level through a pulley, you pull with a force one half the weight of the load because two ropes are pulling now up on the load.  100 pound load = 50 pounds pull + 50 pounds on fixed rope.\n\nThe overhead pulley required you to pull the rope say 10 feet to lift the load 10 feet; but the pulley below you required you to pull the rope 20 feet to lift the load 10 feet.\n\nYou can calculate more complicated pulley systems either by counting the number of ropes that are under tension that actually lift the load and dividing the load by that number or you can determine the length of rope you must pull to raise the load a given distance and use that ratio to determine your force vs the load weight.  you can do this by making sketches rather than actually setting up real pulleys, ropes and loads.  Good luck.