Balancing brush cutter blades

BobRip · Jun 21, 2005

I have a wobble in my brush cutter on my PT422. Has anyone got a good procedure for balancing the blades? I figured that you connect the two blades together with a bolt and put a fulcrum under where the blades meet. Sharpen till balanced. Any comments

Bob Rip

beenthere · Jun 22, 2005

If I follow you, I don't think that will work.

I use a balancing cone that the blade sets on. Others use a nail in a post, or a screwdriver with a round shank. Or a nail in a vice, such that the blade hole can be placed over the 'round' and if it remains 'level' then each end is similar in weight.

But two blades bolted together? Doesn't seem it will give you a good answer for each blade individually.

MossRoad · Jun 22, 2005

Weigh them on a scale.

NJBill · Jun 22, 2005

BobRip
JUST A THOUGHT
Because the blades were supposedly, originally made identical, I would think that as you are trying to grind equal parts from each blade, the use of a balance scale, postal meter, or some other equivalent, would give you equal weights.
A normal mower blade has to be balanced one side with the other,so making one same weight as the other, should bring you very close to your expectations
Bill

Bird · Jun 22, 2005

Like MossRoad and NJBill said, I had some scales that would register up to 20# (used primarily for weighing my rabbits), and I just hung the blades on those, one at a time and made sure they weighed the same.

beenthere · Jun 22, 2005

Question?
Are we talking of balancing between blades? or balancing within one blade, end for end?

tracdoc · Jun 22, 2005

the brush cutters have a PAIR of diametrically opposed swinging blades spinning on the same hub, hence the need to balance one to the other. Take a lookee at underside of MR's unit {HERE}

BobRip · Jun 22, 2005

Yeah, that's what it looks like. The unbalance is not severe, so weight match might be enough. I will try the bolt method first.

Bob Ripley

beenthere · Jun 22, 2005

Ahh! the lightbulb just came on, duh!
Thanks for that pic. It's a good one for reference.

I see now where I was off track here, and sorry for pulling this thread off track. /forums/images/graemlins/blush.gif