Granite Surface Plate – Part 2

Continued from Part 1

So, to set the scene:

I’ve got a 1200-pound slab of granite resting on a metal cart with wheels… in the back of my truck.

I also have an ingenious system of ramps and winches to load the granite into the truck.

The problem now is how to get it out.

…in a controlled manner.

As I thought this through, I broke the operation down into 3 steps.

Step 1: Use pulleys to pull the granite towards the tailgate.
Unloading1
Step 2: Re-configure the cable to pull from outside the cart’s legs.
Unloading2
Unloading3

Step 3: Once the granite is ready to role down the ramps, move the winch cable back to the “loading” position, and slowly let the cable out.
Unloading4

In practice, it went very similarly to this, at first.
Step 1:
Granite Surface plate

Step 2:
(I clamped a 2×4 onto the stand and against the back of truck cab to keep the granite from rolling back into place while I moved the cable to the other side of the leg)
Granite Surface plate

Step 3:
… here’s where I hit a snag.
Instead of rolling smoothly onto the ramps, the wheels of the granite were simply pushing the ramps off the end of the tailgate.

I tried running a rope around the end of the ramps, but that didn’t work, since I needed the keep the ramps separated to align with the cart wheels and the rope kept pulling the ramps together and askew.

So I did something a little more involved.

First I secured the granite back into place, wanting to avoid a bad situation while I worked behind the truck.

I drilled holes and then cut slots in the plywood on top of the metal ramps with my jigsaw (cutting just the wood, not the metal).
Granite Surface plate

Granite Surface plate

Then I ran one strap through each of the ramps,Granite Surface plate

and secured them to the bumper.
Granite Surface plate

Then I went back through steps 1 and 2, and this time the granite rolled effortlessly onto the edge of the ramps.

Before I pulled the front wheels of the granite onto the downward slope of the ramp, I clamped a 2×4 across the bed of the truck, in a position that would stop the granite just after it started pulling itself down the ramps (but before it started to gain any significant momentum)
IMAG0386Granite Surface plate

With the granite resting against this 2×4, I walked around the FRONT of the truck to get to the cable on the other side of the truck bed and move the cable into the “pulling” position to use the winch to slowly let the granite down the ramp.
Granite Surface plate

Granite Surface plate

Done.
…I need a nap.
…and a change of pants.

NOTE: at all points during this process, unless the granite was fully secured, I only walked in FRONT of the truck, not behind it in the path of the granite should something fail. Keep in mind, 1200-pounds is a lot of pounds… Significantly more pounds than my one-rep max for bench press.

Safety

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