just a rough drawing please
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just a rough drawing please
Picture of my home-made actuator on profile. I also use 2 large springs from the motor bracket to the lifting arm either side of the bolts to help it start up easier with a few feathers on the end!
Hope it helps someone
http://images.ibsys.com/2003/1126/2665390_200X150.jpghttp://images.ibsys.com/2003/1126/2665390_200X150.jpg this is probably the best type of jack to use, they are easy to disasemble and the pitch of the thread is pretty good, but its probably better to add a gear reduction in unless your using a window wiper motor, then it will be fine.
ok so is the silver circle the pivot grant on your home made thingy? do you have a pic of the entire construction?
Hi grant , In the pic on y our profile did you just make the entire thing buy yourself or did you dismanlte a car jack ?
Mark- The silver circle on the yellow lifter part is the pivot for the arm, but the silver bit on the motor/thread just joins the thread to the motor via pins and weld on the thread.
Alister-yes i made the whole thing myself, we used the car jack for the wiper motor on the pit as it is a much larger pitched thread and so would not give a large enough reduction on the gold motor and so it would be too fast and not lift enough. i just bought a length of toughned steel threaded bar(M8 although M10 is probably better for other lifters)
So does it work like this-
The motor is fixed down put is allowed to pivot round. As the motor turns, the screw pulls the one side of the pivot down and the motor pivots up?
i think you have the rite idea but not too sure. The back end of the motor mount is held but able to pivot, the lifting arm pivots just above where the thread attatches. and so when the motor screws the thread in, the arm goes up, and the motor pivots slightly from the back.
Ok, Im finally getting around to making my own linear actuator but Im wondering if anyone knows where I can get some hollow tube with walls about 2-3mm thick, and with a tapped 8mm thread down the inside hollow bit, so that a length of threaded rod can fit in it. Is it likely to be available in garden centre/DIY shops or is it something which may have to be custom made?
Many thanks,
Jamie
erm, i cant see that being sold on the shelf so it would most likely have to be custom made. what size thread are you looking at? and how long does the tube need to be?
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