On 2013-04-08, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
Brian Lawson fired this volley in
:

My forklift is a double section unit. I know there is a name for that,
but don't remember it. Once the fork carriage gets to the top of it's
track, a second section begins to go up. If you machine is like that,
your weight will only be correct when using the lower section.

Paul


Hey Paul,

Yeah, but for "weighing" purposes, it will only be when "picking" the
load and not when the mast is reaching extension..


That's not the case with all lifts, even those with double and triple-
section masts.

If the cylinder is not the telescoping variety, and if (as is often the
case), the cylinder is lifting one or a pair of sprockets that lift
chains that lift the mast (for obtaining multiplication of travel), then
the cylinder is picking up the same weight from one end of travel to the
other.

Only if the mechanical advantage or effective cylinder size changes does
the pressure vs. travel change.

The telescoping of the mast itself is just to make it all fit in a more
compact space when lowered (so it can go through doors).

My mast has three cylinders. One in the middle, and two on
sides. Those two start extending only after the main cylinder has
extended, and at that point the pressure rises something like 1.5
times.

i