Blade-balance oddity

[bullet bob]

I bought a used Toro 21" self-propelled for my daughter. Among other things, I pulled the blade, sharpened it but when I went to balance it using my https://www.sharpeningsupplies.com/...8vIgSSCKYG-FFbB7tjnKVGrVH0G7DFqxoC47kQAvD_BwE
When the blade was completely horizontal, it showed a perfect balance. But when I moved the blade to almost vertical, it immediately went back to horizontal. Does this make any sense?

 

[Rivets]

Makes perfect sense. Trying to balance something only 2” wide would be extremely difficult, so the blade wants to balance something 21” long. Someone called it physics.

 

[StarTech]

Besides one side of each end is heavier the other side on the same end. A good balancer can easily see the difference. The balancer I use is very sensitive to this mismatch weight. I am even finding new blades out of balance.

 

[bullet bob]

I thought if something was balanced east to west, it would also be balanced north to south.

 

[StarTech]

Well it seems it would but the laws of gravity works differently. It would someone that studies this to explain why but I think it something to do how things attract and repel other each other.

 

[SeniorCitizen]

My pocket knife blade dead centered on the hole doesn't have that problem .

 

[Jimmy the Lock]

So how do you guys bring a blade in to balance if it's out of balance?

Do you take a grinder and remove material off of the blade on the heavy side and keep testing until it's balanced?

I know ya'll can't be adding weight as you'd have to get a welder for that

 

[*CPB*]

I thought if something was balanced east to west, it would also be balanced north to south.

Then how would you know if it was ever out of balance?

 

[MParr]

A 16d nail in a stud or tree works well.

 

[*CPB*]

A 16d nail in a stud or tree works well.

It works, but it doesn't work well. A nail is equivalent to a calculator that shows whole numbers only.