“THIS IS MY BENDPAK” – MAKING THIS LIFT MINE (Part 5 of ?)…
(Note: This is a continuation of a series of entries I made on the custom accessories I was building for my BendPak HD-9XW car lift way back in early 2014.
Here is Part 1 of the series if you care to see the history:
“THIS IS MY BENDPAK” – MAKING THIS LIFT MINE (Part 1 of ?)…
Well, I’m finally getting back to one of the accessories.
A POOR MAN’S SLIDING/ROLLING BRIDGE JACK
When I bought the lift, I just couldn’t justify the extra $1000 for the RJ-45 rolling jack. (Maybe someday when I’m into full restoration of my cars, but not now.) You BendPak guys are familiar with the RJ-45, but for the others, this is what it looks like.
But, I knew I needed something to start with and sprung for the jack plates. I could just buy some bottle jacks and use the BendPak JP-3 or JP-6 as is, but what would be the fun in that? Here is what BendPak intended.
I wanted a more permanent solution and one that I could potentially power up. So I’m in the process of building a poor man’s sliding jack for the HD-9XW. I’m starting with my existing JP-6 plate (which could be fabbed from scratch for a fraction of the cost, btw):
Two of these special military scissor jacks will be mounted on it. Each are rated at 1-1/2 tons and they are pretty compact, yet seem pretty sturdy.
What I like about these particular jacks is the way they were designed to travel up. There is a slight offset that occurs as they rise. On my particular jacks, the top pad moves about 5/8” as it travels from bottom to top. This allows the jack to be very stable while allowing the car to arc as it lifts. The blue pointers indicate the center of the top pads and the offset is witnessed by the distance from the square to the top blue mark.
This crude sketch explains the movement that takes place when a car is lifted on one end (or side). In this exaggerated example, the red arc represents the travel of the rear axle as it is lifted with the front wheel chocked. I feel it’s a good idea that a jack accounts for this movement somehow to avoid extra lateral stresses being induced in the jack arms.
On top of those jack pads, this beam (sold as a floor jack cross beam adapter) will be mounted to make it adjustable in width and also to tie them together for extra lateral stability:
Eventually, I want to take it one step further and power it with some of these reversible 110VAC gearmotors I have lying around. They worked perfectly on the garage door openers and power TV system, and I think they will do great here.