The Lynx ProjectLincoln-Mercury’s Lost Dream Car

BUILDING THE SCISSORS JACK

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03 December 2015:

After a long hiatus and having finished the plane, I started designing the scissors jack. I figured out designing the lifting mechanism, which took about two months.


04 December 2015:

I cut lengths of brass rectangular tubes for the scissor beams. I applied M4 rivet nuts in the outer beams which will incorporate M4 setscrews, going through the central tube axis of the inner beams. I also drilled out the penetrations for the I-beam traverse between the inner beams.

05 December 2015:

I assembled and soldered the inner beam group.

06 December 2015:

I prepared, cut and soldered the fulcrum brackets and lower rails for the scissor beams.
 

12 December 2015:

For the rollers at the beam ends, I made use of M2 screws. To prevent scratcing of the paint while in operation, I thought of covering the screw heads with black gun glue. I dipped the screw head into hot glue in a die and trimmed the excess after cooling.
The roller wheels shown inside rails.


The front side of the lower scissors assembly.

14 December 2015:

I cut the main platform beams from brass C-sections and soldered the rails for the upper rollers of the scissors.


I assembled the rest of the main carrying construction of the platform and checked the operation.



The fully lowered view.

16 December 2015:

Coming back to the hydraulic piston+cylinder; I had been thinking about a method to provide adjustable height for the platform. Finally, I ended up with a good solution that made the previosly manufactured one obsolete. I designed a multi-pieced unit, where the body of the cylinder is free to turn inside the base bracket. The cylinder has a M3 threaded section in the middle, which houses the M3 threaded end of the piston rod. Since both pin-joint ends are not free to turn abut the cylinder axis, rotating the cylinder body will end up in linear displacement of the piston rod. The cylinder body is broken into two mating parts, to make threading possible. 

I joined the cylinder parts with solder, and prepared the end pin-joint head for the rod.



I prepared and soldered the fulcrum bracket for the end cap of the assembly. Then I drilled a 0.8 mm dia. hole through the end cap, which will lock the cap in place. I stayed away from soldering the end cap to the base, since solder could leak through and fix the cylinder body that should never be obstructed for rotation.



I inserted a pin through the hole and the main body assembly was now complete.



17 December 2015:
I assembled the cylinder in place.
And here is a video about how it works. Sorry for the quality, my other hand was busy with recording :-)

 

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