Hole hawg question

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peter d

peter d

Senior Member
Location
New England
I took one of the brushes out of my Hole Hawg today to inspect it. When I put it back in and fired the drill up, the drill sounded totally different and was making a horrible screeching sound.

So I took the brush out again and flipped it around, and the drill went right back to normal. I noticed that the brush had a contour on it, so I'm assuming that when I put it in "backwards" (by accident) it was on the commutator against the contour it had formed over the years. I'm just wondering why this would affect the drill so badly.
 
Even new brushes need "seated" to the com. Put an old one in backwards, and it will be all hosed up. Only a little tip will be touching the com surface, since it has seated in over time for a certain direction. Probably made a nice spark show when you put it in backwards.
 
mdshunk said:
Probably made a nice spark show when you put it in backwards.
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Yup, it lit up pretty good. At that point, I knew something was wrong.

So what happens when you put in brand new brushes? It does what I described until they wear in?
 
peter d said:
So what happens when you put in brand new brushes? It does what I described until they wear in?
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The procedure is specified by the manufacturer, but it normally involves the use of a brush seating stone (wears grit off the stone to help the brushes seat quicker) and running the tool at a specified low RPM for a specified period of time.
 
Some brushes are almost square so you must be careful to install the brushes with the curvature in the correct direction. If it is obvious (rectangular shaped) then I just drop them in.
 
I would think that some manufacturer's would contour the edge of the brush so that it will work right out of the box. After all they should know the exact amount of arc required for the brush to make perfect contact.
 
infinity said:
I would think that some manufacturer's would contour the edge of the brush so that it will work right out of the box. After all they should know the exact amount of arc required for the brush to make perfect contact.
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They do, for the most part, when you're talking about power tools. The com, however, does wear a bit in diameter. If the tool ever underwent a major overhaul, the com may have also been turned a bit on a lathe and undercuts redone.
 
see how it works

see how it works

LarryFine said:
"As a kid?" Who's stopped? I still open everything.
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me too...oppps where did that spring go and where did it come from
 
Dose anyone know where I can find an extension that goes at the end of the hole hawg it 3-4' long with a small bend at the end with a 1/2 chuck on it? I saw it on a job and I was able to drill through the floor joist and top plate without a ladder. I drilled out teh first floor in know time at all the guy said it was old and someone gave it to him. This was made for this drill it had an arm that held it self to the case and a flex rod inside a tube that attacted to the chuck.
 
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