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Any love for this type of spotweld cutter?

Posted by NOHOME 
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P P
O, Ontario, Canada   can
1967 MG MGB GT "Maggie (GT From Hell)"

Going to do a set of floors in the next week or so. Traditionally, I don't use anything more sophisticated than a 1/8" and a 5/16" drill bit to drill out the spotwelds.

I hate the "hole Saw" type spotweld cutters because they wear out fast and leave an island of metal that needs to be ground away. Plus they require that you drill a 1/8" pilot hole anyways.

I have seen this other type of cutter that looks like it would do a decent job. Have not tried them because it would involve mail ordering and they are not chap 15-27 bucks a pop. If I buy 4 of them, I would have up to $100 just into the bits.

Are they worth it?

On another note, since I am doing another set of floors, if anyone wants any pictures of a particular process for an upcoming project of their own, feel free to pre-order!

Pete


Attachments:
Sill_2.JPG    13.9 KB
Sill_2.JPG

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David Townsend
Rutland, Vermont, USA   usa
1978 MG MGB V8 Conversion "'B'east"

I bought a couple of these from Eastwood for my sills and thought they did a decent job and didn't seem to wear all that fast.


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Lloyd Faust
Southlake, TEXAS, USA   usa

mine last for years.......you know why Peter..devil smiley



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steve bali
Vernon, BC, Canada   can

Hi Peter,
I purchased these cutters from KMS Tools for $14 each they come in two sizes work very well and last a long time

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Brad Pace
Deep Creek, Wa., USA   usa

I have used that one and did not care for it. It took a lot of pressure, wandered and broke. I have tried all manner of spot weld cutters and have quit them and gone back to using a carbide ball burr and narrow cut-off in a die grinder. One panel will always be sacrificial so grind from that side and look for the dark ring that shows where the spot weld stops. Attached is a pic of my current project and you can see how many welds were cut using this method.


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Morrison BE 026.jpg    38.2 KB
Morrison BE 026.jpg

Morrison BE 013.jpg    45.2 KB
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Benny Avatar
Ben E
San Diego, CA, USA   usa

Peter,

A few months ago, Lloyd posted a picture of a spot weld drill that has effectively has a built in depth-stop. They appear to use a similar cutter to the one you posted.

I found one of those drills pretty cheap on eBay, but haven't had a chance (or need) to use it. You're welcome to give it a try if you'd like....just cover the shipping, and you can borrow it pretty much indefinitely.....it even has a good cutter in it.

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Dave Craddock
Redford (Detroit), Mi., USA   usa

Pete, it looks like in the worst case you could resharpen it yourself, might have to dress up a narrow
grinding wheel.
Dave


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P P
O, Ontario, Canada   can
1967 MG MGB GT "Maggie (GT From Hell)"

In reply to # 2305818 by Benny Peter,

A few months ago, Lloyd posted a picture of a spot weld drill that has effectively has a built in depth-stop. They appear to use a similar cutter to the one you posted.

I found one of those drills pretty cheap on eBay, but haven't had a chance (or need) to use it. You're welcome to give it a try if you'd like....just cover the shipping, and you can borrow it pretty much indefinitely.....it even has a good cutter in it.


Ben:

That is a kind offer. Sound like you are going down the "No More Rusty Cars for me road!"

I am actually pretty good with the two drill bit way technique. I buy 4 small and 2 large bits for the typical job.

I think I will see if my paint supply guy can order some for me. Not being a pay-pal person I have a hard time ordering stuff on line.

Benny Avatar
Ben E
San Diego, CA, USA   usa

In reply to # 2306041 by NOHOME Ben:

That is a kind offer. Sound like you are going down the "No More Rusty Cars for me road!"

HA.....apart from a '66 Ranchero I bought with rusty floors when I was 15, I've never bought a rusty car.

At one point, I had convinced myself that my Iris Blue '65 needed new floors, but after looking at them again and again, I've determined that the weak spots are so small, that they can be carefully patched with very acceptable results.

The offer stands if you want to give this thing a whirl.

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Jim Macaulay
Concord Ma., USA   usa

Lloyd, That was just flat wrong but not necessarily mean spirited!

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Hal G Hultman
Wayne, MI, USA   usa
1972 MG MGB "The "B""

Peter, when I replaced the sills and floor pans in my '72, I used the BLAIR PREMIUM SPOT WELD CUTTER KIT # 11082. Although this is the hole saw type that you don't care for, I was really happy with it's performance. I did the entire driver side sill replacement and floor pan using two bits. I would not have needed the second bit had I not got impatient and overheated the bit, thus losing the temper of the cutting teeth. With this cutter I can easliy cut out a weld in about 10-12 seconds. Remember that these old cars have very soft mild steel unlike the cars being built today and very little pressure is required. The cutter always left a clean hole that looked like it had been punched out. No grinding neccessary. Lastly, you need not drill a 1/8" pilot hole as a center punch is all that is needed to keep the pilot from drifting. The kit comes in a nice compact storage case and comes with (1) arbor, (2) pilots & (3) 3/8" cutters.

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Larry McKinney
Thousand Oaks, USA   usa
1972 MG MGB

Peter that looks like a butterfly or brad point drill bit just stubbier, if it's hss or cobalt they should wear well like any good drill bit would think you would only need one maybe 2 at the most

carlheideman
USA   usa

Peter,

We use the Blair spot weld cutters as mentioned above (aka rotabroach) on customer cars. We usually drill a 1/8" pilot, then use a 5/16" cutter. I've used the style of bit you show in a Snap-On spot weld cutting tool I have ($$$$), but find it's a bit slower and more expensive. The Blair replacement cutters are about $5 each and we get about 200-300 spot welds cut before they dull or break.

For whatever type of cutter you use, make sure to clean/wire wheel as much rust away as possible and lube the bit. Rust dulls bits very quickly, so the cleaner the area, the longer the bit lasts.

Also, for floors, we rarely drill out the spot welds. We usually use a 3" cutoff wheel on a die grinder to weaken the spot welds, then use an air chisel to pop the welds loose and cut out the floors. I can get a floor out in less than an hour that way. I wrote a story about the method for Classic Motorsports 7-8 years ago when I did the Modern Midget's floors.

Have fun!
Carl



http://www.eclecticmotorworks.com/



Edited 1 time(s). Last edit at 2013-03-07 08:58 AM by carlheideman.

P P
O, Ontario, Canada   can
1967 MG MGB GT "Maggie (GT From Hell)"

In reply to # 2306596 by carlheideman Peter,

We use the Blair spot weld cutters as mentioned above (aka rotabroach) on customer cars. We usually drill a 1/8" pilot, then use a 5/16" cutter. I've used the style of bit you show in a Snap-On spot weld cutting tool I have ($$$$), but find it's a bit slower and more expensive. The Blair replacement cutters are about $5 each and we get about 200-300 spot welds cut before they dull or break.

For whatever type of cutter you use, make sure to clean/wire wheel as much rust away as possible and lube the bit. Rust dulls bits very quickly, so the cleaner the area, the longer the bit lasts.

Also, for floors, we rarely drill out the spot welds. We usually use a 3" cutoff wheel on a die grinder to weaken the spot welds, then use an air chisel to pop the welds loose and cut out the floors. I can get a floor out in less than an hour that way. I wrote a story about the method for Classic Motorsports 7-8 years ago when I did the Modern Midget's floors.

Have fun!
Carl

Carl:

I keep hearing about and trying the grinding wheel/cutter method to remove panels, but for some reason it seems like a lot of work with a lot of mess and noise.

I will see if I can find the Blair spot weld cutters locally as they would have to be a quality tool if you are using them. The ones I have used have all left a center island after the cut that needs to be ground down.

pinkyponk Avatar
Adrian Page
Berwick, Nova Scotia, Canada   can

I'm getting one of these for the next one I do.


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spotweldDrill.jpg    15.8 KB
spotweldDrill.jpg

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