Question about Makita 9005B 5" Electric Angle Grinder

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Angle grinder eats carbon brushes

I've just gone thru my 3rd makita grinder 9005B in 2 years. am i abusing them? I'm cutting rock (flagstone, ledgestone) with diamond bit blades. They work great then suddenly start eating carbon brushes. Armature damaged by rock dust? Is there a brand or model with enclosed armature? Thanks for your help.

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  • Makita Master
  • 885 Answers

Yes, the rock dust is what's destroying your brushes and armatures. It gets sucked into the rear vent slots and gets to those parts and eats them away quickly. I don't know of any vacuum systems make by Makita but there are some companies that make them for their systems. Blastrac is one that comes to mind but they can be real expensive systems. I don't know of any grinders with sealed brush/armature systems, they have too much heat to disipate. To make your Makita grinders last longer make sure you are cutting with the side of the blade that directs the dust away from the case and try to have a strong airflow blowing the dust away from the grinder to minimize the dust taken in at the back of the grinder.

Posted on Aug 23, 2010

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