Yes it is possible
The blades should have writing on them indicating which way they face up or down or towards grass side.
The blade usualy turn clock wise so the blade should be put on with the sharp edge pointing in the direction of the rotation.
Hope this helps.
Blades of a lawnmower is held by nuts and bolts.
It is due to the momentum still in the blades.
lawn mower blades are made of steel but some are made of plastic
For a healthy lawn, you should sharpen your lawnmower blades. Dull blades don�t cut your grass, they tear and damage it. You can use a file or a grinding wheel to sharpen them. You should always remember to remove the blades from the mower. Sharpening the blades while they are still attached to the mower is dangerous. You also need to keep the blades balanced. If your blades are uneven, sharpen the heavier end until the blades are level. Unbalanced blades cut unevenly and put extra wear and tear on the lawnmower. This will eventually damage your lawnmower�s engine.
Your blades probably need to be sharpened.
2 21inch blades.
Adjust the height levers next to each wheel.
A lawnmower typically uses mechanical energy to cut grass. The engine inside the lawnmower converts fuel into mechanical energy used to rotate the blades and trim the grass.
When sharpening lawnmower blades it Is important to check the blades for cracks or large notches due to hitting debris if any of these things are present it is important to buy new blades
Vise clamps , A file ,sand paper ands piece of wood
If the lawnmower is not electric powered then is is probably operated by an internal combustion engine (petrol or diesel. Oddly enough, very early lawnmowers were steam powered, which means they were examples of external combustion engines.
www.lawnmowerman.tv/Troubleshooting.asp The problem could be that the lawnmower is out of gas or that something has caused the blades to not turn. Check to make sure the gas tank is full and that there is nothing inhibiting the blades from turning.