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spot weld cutters

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Hammer1963

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Jan 2, 2011
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Kentucky
Another Rotabroach user here. I also like one that Kent offers with a small pilot ground into the bit.
 

dnschmidt

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Oct 3, 2014
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Phoenix, AZ
A lot of people today are not using spot weld cutters but instead are using small belts sanders and simple sanding/grinding through the spot weld. Quite a bit faster.
 

JeepsAreBuilt

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Nov 24, 2006
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1,066
Location
The Beautiful NorthWest
I've never used those rotabroach style cutters on a regular basis. Ive only use spot weld drill bits.. in size 5/16 and sometimes 3/8". I dont know why people like the rotabroach style, they do not remove the spot weld itself... it only cuts around it. The drill bit type will remove the weld, and you wont have to grind it away before putting the new panel up to it.

You want the best ? buy the dentfix drill bits.
 
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JOHN

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Aug 12, 2005
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Minnesota
A lot of people today are not using spot weld cutters but instead are using small belts sanders and simple sanding/grinding through the spot weld. Quite a bit faster.

I would like to hear more about this, not making sense to me right now?
 
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JOHN

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Aug 12, 2005
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Minnesota
I've never used those rotabroach style cutters on a regular basis. Ive only use spot weld drill bits.. in size 5/16 and sometimes 3/8". I dont know why people like the rotabroach style, they do not remove the spot weld itself... it only cuts around it. The drill bit type will remove the weld, and you wont have to grind it away before putting the new panel up to it.

You want the best ? buy the dentfix drill bits.

this is what I have been using also, and would agree with what you say above, then you would have to grind that "hole saw" piece off afterwards-
 

BTMSUP

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Feb 2, 2015
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212
Location
Milwaukee, WI
this is what I have been using also, and would agree with what you say above, then you would have to grind that "hole saw" piece off afterwards-
It is so much faster to use the rotabroach and then grind off the small spot weld that is left. There is a reason these are the standard in the auto body world.
 

twertsy

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Jan 5, 2014
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Location
Reedville, VA
The ASTRO or Dynabrade 3/8" or 1/2" wide air driven belt sanders using a 3M 577F Alumina/Zirconia 36 grit belt will grind through a spot weld faster than you can drill it. Check the following link on 3m's website: http://3mcollision.com/products/abrasives/belts/3m-green-corps-abrasive-file-belt-36-grit-31801.html

2 observations DNS. First, having admittedly never used a sander for this, I've got to believe it'd try to run out like an SoB as soon as you touch the surface. Second, I can think of, and I'm guestimating here, but at least 40% of the spot welds that I've had to cut out in the GTO there's absolutely no way I could've gotten the sander in there. Trunk lip, lower front fender to inner / rocker spot welds, inner side cowl, on and on.
 

dnschmidt

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Oct 3, 2014
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Phoenix, AZ
Watch the video at the link provided. If you can get a drill on it you can get one of these miniature belt sanders on it.
 

Blake150

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Jan 20, 2013
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93
Location
Indiana
I use a belt sander like this daily. It works very well on high strength steel and metals that most spot weld bits won't touch like boron
 

K-Dog

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Mar 15, 2014
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Location
Millersville Maryland
It all depends on which piece you are cutting, which piece you are saving and which piece you are not saving.
I remove spot welds many different ways, Rotobroach is just one of the ways.
 

BTMSUP

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Feb 2, 2015
Messages
212
Location
Milwaukee, WI
It all depends on which piece you are cutting, which piece you are saving and which piece you are not saving.
I remove spot welds many different ways, Rotobroach is just one of the ways.
This is absolutely true. Talked to my paint rep about these belt sanders today. He said they pushed them hard for a little bit and they have their place for sure, however in the body shop world the rotabroach is still king.

That being said he is getting me a price on one. I see the advantage, it now depends on the cost.
 
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