DIYbanter - View Single Post - Made a "Forklift Scale" for the working poor

Ignoramus32392

On 2013-04-07, Paul Drahn wrote:
On 4/7/2013 12:49 PM, Ignoramus32392 wrote:
On 2013-04-07, wrote:
On Apr 7, 10:06?am, Ignoramus32392ignoramus32...@NOSPAM.
32392.invalid wrote:

So, now I always know the main cylinder pressure. I am going to weigh
a few things of known weight (I do have a 10k floor scale, so it not
hard to come up with known weights). Then I would write up a table of
weight/pressure values and run a linear regression, then I would print
out a table with these values. That way we'll know for sure what
weighs how much.

I did hook all of that up yesterday, but did not yet play with this
due to lack of time, but I plan on doing so shortly.

i

I would be interested is knowing how linear the weight / pressure is.
Where I worked they have a sling test tower where they proofed and
certified weight handling gear. I am pretty sure they ignored any
possible non linear effects and just multiplied the pressure by the
area of the piston. And I have always wondered how accurate that
approach was. Have also been involved with making small weight scales
to go under each wheel of a race car to set up the suspension. There
of course one does not need absolute weight.

I will try to play with it and see.

I have a 5k forkilft that weighs about 8k lbs. I want to see if the
position on forks matters, etc, and how to get the most reproducible
pressure (creeping up vs stopped vs creeping down).

Extreme accuracy does not matter, +/-3% would be fine.
i
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

Mine is like that, also. Just a little bit more work to make a
conversion table.

i