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Spot Weld Cutters Preference
#1310402 Sat May 11 2019 07:17 PM
Joined: Dec 2018
Posts: 518
A
Apache1 Offline OP
Shop Shark
OK so you have your specially ground drill bit or a spot weld cutter. I've only used the first one with fairly good success. Certainly the objective is to not intentionally drill past the top panel and try not to disturb the bottom in order to separate the panel in question. So...is one better than the other or should I say its only as good as the individual operating the drill.
Seriously, is one better than the other or is there an occasion where both should be at ones disposal?

Last edited by Apache1; Sat May 11 2019 07:18 PM.




Re: Spot Weld Cutters Preference
Apache1 #1310404 Sat May 11 2019 07:34 PM
Joined: Oct 2005
Posts: 3,518
"Hey! I sound like Darth Vader!!
I've used different methods as of late. My cowl panel was done with an old Snap-On center pilot drill bit spot weld cutter. Didn't bother me to weld up the center 1/8" hole on the panel that was staying. Comes in different diameters. As far as I'm concerned, easier to use than the center spring loaded awl type that Mac is selling these days.

When I did the wheel wells on the Suburban, so much metal was going to be fabbed and replaced by me, that I took a disc sander, sanded the spot welds until thin, then used a spot weld splitter ( a hard steel bar with a knife edge) and sheared off the rusty pieces.

I haven't used a drill bit to separate spot welds for a long time!

Re: Spot Weld Cutters Preference
Apache1 #1310407 Sat May 11 2019 07:48 PM
Joined: Dec 2018
Posts: 518
A
Apache1 Offline OP
Shop Shark
A spot weld splitter...I need check them out for sure. I have used a pneumatic chisel on occasions for stubborn stuff. Although it will do some damage real quick! All of my bits have been used up and trying to decide if I should buy more or opt for cutter style.





Re: Spot Weld Cutters Preference
Apache1 #1310419 Sat May 11 2019 10:52 PM
Joined: Mar 2010
Posts: 10,076
5
'Bolter
I have used a spotweld cutter before, but it dulled before I was half way done with a couple hundred spotwelds. I had an issue with getting the center to stay in the middle of the spotweld also.
I have been using a 3/16" drill bit since giving up on the spotweld cutter. The drill bit seemed to find the center of the spotwelds by itself. The 3/16" bit is plenty big to get all of the spotweld, and was just the right size to be able to get the bottom metal red hot for TIG welding the spotwelds back in. My old spotweld cutter made a huge hole, requiring too much welding, threatening warping of the panels.

Re: Spot Weld Cutters Preference
Apache1 #1310427 Sat May 11 2019 11:45 PM
Joined: Jan 2018
Posts: 367
B
'Bolter
I purchased a set of Blair spot weld cutters and had great results. They are a little pricey but the do work great. Bill


1937 GC
Re: Spot Weld Cutters Preference
Apache1 #1310434 Sun May 12 2019 12:21 AM
Joined: Dec 2018
Posts: 518
A
Apache1 Offline OP
Shop Shark
Where did you find Blair cutters. Maybe one can ignore the investment if the results are favorable.:>)





Re: Spot Weld Cutters Preference
Apache1 #1310443 Sun May 12 2019 01:42 AM
Joined: Jan 2018
Posts: 367
B
'Bolter
Internet..type in Blair spot weld cutter. Also called rotabroach.

Last edited by Bill Trotter; Sun May 12 2019 01:48 AM.

1937 GC
Re: Spot Weld Cutters Preference
Apache1 #1310450 Sun May 12 2019 02:14 AM
Joined: May 2006
Posts: 8,490
L
Master Gabster
I like the Rotabroach as well. I have a couple os set of them in assorted sizes, including an older set that was made by Hougen, which was the original manufacturer before Blair bought them out. Any welding supply store should carry them, too, plus I know that Snap-On sells them under their Blue Point name. Classic Industries also sells them.


Bill Burmeister
Re: Spot Weld Cutters Preference
Apache1 #1310475 Sun May 12 2019 11:57 AM
Joined: Dec 2018
Posts: 518
A
Apache1 Offline OP
Shop Shark
Thanks fellows.





Re: Spot Weld Cutters Preference
Apache1 #1310498 Sun May 12 2019 04:48 PM
Joined: Oct 2005
Posts: 3,518
"Hey! I sound like Darth Vader!!
Snap On has gotten cheap with their stuff. The older cutters are the Blair/Rotabroach style with a centering drill bit.

Here is the older Snap On cutters and the splitters.

Attached Files
spotweldcutter.jpg (5.05 KB, 95 downloads)
spotweldsplitter.jpg (28.09 KB, 94 downloads)
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