I have an Onan DJE 6kw generator pictured here:
This generator weighs approximately 500 lbs.
I am designing a portable platform for it, in the following way:
It will be on four 13", 5/8" axle pneumatic wheels with bearings that
are $5.99 at Harbor Freight.
Then there will be a plywood platform over these axles. Size 2x4
feet. Underneath the platform, there will be two 2x6 boards running
along the longer edges, with holes drilled for the axles. The axles
will not spin, the wheels will spin separately as they are on
On that platform, there will be two used 2 foot diameter tires whose
purpose would be to provide cushioning and vibration dampening.
Above that, there will be another platform to which the generator will
The generator legs form a square that roughly 16x16 inches. I plan to
put the generator legs on 2x4 pieces, laid in a diamond shape like
| / \ |
| \ / |
| \ /
The legs of the generator will be bolted to these four edges of the
diamond made of 2x4s, each leg being in the middle of each edge. I am
sorry if my explanations are not very good, I am a foreigner.
My question is regarding this second platform. I want to make it from
two layers of 3/4" plywood, glued together. One 3/4" layer is not
strong enough. The question is, is strength of 1.5" plywood (2 3/4"
layers) good enough to support a vibrating 500 lbs generator, given
that there is plenty of cushioning from the tires underneath.
Someone suggested a torsion box. I do not mind that, as such, however
I am concerned that its extra thickness is going to raise the center
of gravity of this construction, too much. Hence, I will do a torsion
box only if absolutely necessary. I hope to stay under 4 feet total
height, in hopes of lowering cost of the generator enclosure.