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Any easy way to make a small lawnmower blade? (12" DIA)?

Hey I am trying to make a robot lawnmower from some motors and a microcontroller I have. The only thing I'm stuck on is where to get such a small blade for mowing (12" DIA or lower)

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jtobako8 years ago
I picked up a bunch of 10 inch edger blades at Wally World last winter on clearance. They should have more by now : )
CameronSS8 years ago
You could try using weedwhacker blades...you can get nylon blades designed to be tougher than a string, but still light enough to be used on a handheld weedwhacker. Also safer--if your robot rises up against you, jab a piece of rebar at the blades and they'll break.
galaxyman7 (author)  CameronSS8 years ago
Lol, thanks for the advice, I think I will try that. Only problem is that I don't want to replace the nylon, so do you think metal wire will work?
It would do an excellent job cutting the grass, but metal fatigues. The wire probably wouldn't last too long before it broke, flinging off a tiny metal javelin and leaving an off-weighted shaft.
galaxyman7 (author)  CameronSS8 years ago
hmm, have any other suggestions? I need something fairly permanent
The nylon blades are rather durable. I have never used them personally, but if you're only cutting grass (not running over sticks, rocks, etc.) they should last quite a while, and they're pretty cheap.
i dont think it would be possible to make a blade that would be sharp enough to cut the grass properly and anyway i definitley wouldnt reccomend making one because if it breaks there will be pieces of the blade flying through the air which could kill you!!!