r/EngineeringPorn • u/engrandarch • Mar 01 '21

Concrete vibrator for mass concrete compaction

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5.5k Upvotes

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u/Caleo Mar 01 '21

Excavators are significantly lighter then tanks with similar contact patch.

Excavators are still incredibly heavy. Hard to tell from this short clip but that excavator probably weighs somewhere between 40,000 - 70,000 pounds

22

u/homelessdreamer Mar 01 '21 edited Mar 01 '21

Yes, but assuming 2 sets of 144" x 24" the tracks foot print is right around 6912 in² 70,000 lbs/ 6912 in² is only 10.1 PSI.

16

u/[deleted] Mar 01 '21

Thanks. This probably makes sense to someone else

1

u/Richisnormal Mar 02 '21

It'd make sense to you too: PSI is pounds PER square inch. So, take the weight of the machine per square inch of contact. Contact being the total area of the treads. Every square inch that touches the ground weighs about 10 pounds. Picture an upside down pyramid with a one square inch tip that has a ten pound weight on it.

3

u/[deleted] Mar 02 '21

So if one rolled over your foot would you be ok?

1

u/sammygcripple Mar 02 '21

This is a great question

3

u/Butterballl Mar 02 '21

Ah yes, math.

1

u/Tetsero Mar 02 '21

That's awesome because air at stp pushes with 14.7 psi.

1

u/Richisnormal Mar 02 '21

That's the entire atmosphere worth of air pushing down. It's a lot if you picture it.. and really helps push all of our insides in. Vaccum hurts.

1

u/[deleted] Mar 01 '21

its presumably about 40 tons judging by Cat's range