T Nation

When Does a Bar Start to Bend?


#1

If I've got a bar that can allegedly hold 1000 lbs. How much weight does it take to start bending that bar?


#2

Need a lot more information, brand, type of bar, type of lifts you are doing. I have a cheap bar that has a permanent bend from the change in direction in squatting with only 315 on the bar.


#3

Damn, I'm looking at a 30mm Xmark Fitness bar. No oly lifts. Mostly just basic, squats, dl, pressing and pulling.


#4

Bars at my gym start to whip with 315. My cheap bar at home, I'm not even comfortable putting 315 on, I feel like it would break before it bends.


#5

Xmark Fitness bar? 382.23 pounds


#6

Every bar starts bending when any amount of weight is put on it.


#7

Though you can use 382.22 all day with no bending. Infact if you keep that bar at 382.22 it's been scientifically shown to improve muscle recruitment.


#8

ohh you've done gone all physical on us now, look out!


#9

Just noting the ambiguity of the question. It was asked like some bar at 299 pounds will be straight, but once you hit 300 it bends. It's a continuous progression of bending from no load on.

It's kind of like asking, "how many pieces of pie would I need to eat before I became fat?"


#10

No.


#11

Yup. And the weight of the bar itself is load.


#12

Yes.


#13

When the jackasses at my gym sit on the fucking things in between sets of curls


#14

Fine in theory.

It is true the weight of the bar is a load, however I challenge you to add a 2-1/2 pound plate and actually measure the change. I could move it more by simply changing the temperature.


#15

The question was when it starts to bend. Not when it becomes measurable. But yes, there are plenty of 3 point bending machines that could measure the deformation with an even smaller load than that.


#16

LOUD NOISES!!!!


#17

Your talking Microns of deformation. Certainly <.0001


#18

I pity your wife & children!
I think we all understood the OPs question.


#19

I'm sure there are specs on bars available, run the numbers if you want. Any bending means that bending has started.

My point was, it's a dumb question.


#20