Lawnmower Blade

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  #1  
Old 06-21-01, 09:10 AM
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Hello,

I'm interested in sharpening the blade for my lawnmower. Any suggestions on how to do this myself? (I'd rather do it than pay somebody else )

Thanks!
 
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  #2  
Old 06-21-01, 09:47 AM
Join Date: Dec 1999
Location: Northeastern NC On The Albemarle Sound
Posts: 10,952
Cool

If you have a grinding wheel, you can sharpen it with that, or you can clamp it in a vice, and sharpen it with a file (wear heavy duty gloves and eye protection for both).
Just sharpen at the same angle as the original angle.
Good Luck!
 
  #3  
Old 06-21-01, 09:55 AM
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Thanks OldGuy!

I don't have a grinding wheel so I'll have to go out and buy a file...any particular brand? do they make files for such a purpose or are most files just the same?

Thanks again
 
  #4  
Old 06-21-01, 10:08 AM
Join Date: Dec 1999
Location: Northeastern NC On The Albemarle Sound
Posts: 10,952
Cool

Just tell the person at the hardware store what you're planning to do with the file.
They should sell you what is called a mill ******* file (get one with a handle, or buy the handle separately and put it on the tail of the file...it is easier to use with one). Files are not made just to file one thing, usually.
Good Luck!


 
  #5  
Old 06-23-01, 06:05 AM
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Join Date: Feb 1998
Location: The Shake and Bake State USA
Posts: 10,440
Hello: NewHomeOwner

Blade balancing methods:

A prior posting asked for a discription of the professionals rotary mower blade balancing tool. With the useage of some visionary imagination and a text only discription, I think I can explain and you will understand the simplest sharpeners rotary mowers balancing tool.

There are 2 other types of mower blade balancing devices used but they would be too hard to discribe, in a text only format.

Picture a number 8 size wood nail pointing vertically upwards with a metal pedestal base about 3 inches round. Then picture a tapered cone about 3 and 1/2 inches round and 3 and 1/2 inches high.

The metal cone is very pointy at the top and has a smooth inside diameter. The cone has several circled ring stepped outside diameters. Each of the several rings is the exact diameter of one of several mower blade center hole diameters.

When the cone is placed on the point of the nail and the mower blade is placed onto one of the cones rings, the blade will balance on it's center point. If the blade is balanced, it will be perfectly level. If not, it will lean to the heavier side.

Additional methods for the homeowner courtesy of Rick...

#1
Picture a 12 penny nail placed horizontally in a shop vise. Place the hole in the lawnmower blade on the nail, and the blade horizontal. The blade will tip or tilt towards the heavier side.

#2
Place a small triangular file in a shop vise, with one flat side of the file facing the floor. Place the hole in the lawnmower blade on the file, and the blade horizontal. The blade will tip or tilt towards the heavier side.

#3
Place a plumb bob pointed side up in a shop vise. Set the lawnmower blade on the plumb bob, similar to your step-tapered cone.

#4
Use a dowel center that has the same size hole as the hole in the blade. Insert the dowel center in the blade hole, and put the pointed side on the head of a roofing nail which has been inserted vertically in a vise. The blade will tip or tilt towards the heavier side.

I think the dowel center works best.

CAUTIONS & SAFETY WARNING...

Once you sharpen your mower blade, it will have to be balanced too. An out of balanced blade will cause vibration, excessive and rapid crankshaft seal wear. The later will cause an oil leak to appear first, then bearing failure.

A severely out of balance blade is also potentially dangerous to the mower operator. Any blade revolving at that speed can become hazardous. The vibration will also loosen other parts on the machine and tire the hands and arms quickly.

Good Luck,
Sharp Advice
Accurate Power Equipment Company.
Small Engine Service and Repair Technician.
Personal Quote:
"If it ain't broke, don't fix it until it is broken!"
 

Last edited by Sharp Advice; 11-06-05 at 06:37 AM.
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