Drill bit size for spot welds : MGB & GT Forum : The MG Experience

Drill bit size for spot welds #1
nicholas74 Nicholas Stinziani New Britain CT, USA Sign in to contact 1967 MG MGB GT Special 1974 MG MGB	Topic Creator (OP) Mar 15, 2010 03:09 PM Joined 16 years ago 359 Posts

Just removing my sills below the door and need to buy better drill bits for spot welds. Any suggestions
thanks for the help
Nick

Reply

Was this post helpful or interesting?

Yes No Thank

Re: Drill bit size for spot welds #2
jewar John Warlimont Abbotsford, BC, Canada Sign in to contact 1970 MG MGB GT V6 Conversion 1971 MG MGB 1973 MG MGB GT 1974 MG MGB GT V6 Conversion	Mar 15, 2010 03:19 PM Top Contributor Joined 17 years ago 3,739 Posts

I used 5/16. You can do with a bit but you are better to buy a 5/16 weld cutter.Snap on has a nice one.
John

Edited 1 time(s). Last edit at 2010-03-15 03:20 PM by jewar.

Reply

Was this post helpful or interesting?

Yes No Thank

Re: Drill bit size for spot welds #3
Jesse L Jesse Lebovics Philadelphia, USA Sign in to contact	Mar 15, 2010 03:45 PM Joined 19 years ago 43 Posts

I ended up buying one of these for that same purpose.

It has proven invaluable in all aspects of the body shell restoration.

http://shop.blairequipment.com/Fractional_Rotabroach_Cutter_Kit_p/11090.htm

I have no affilliation with this company and you could probably find the same type of tool elsewhere.

Reply

Was this post helpful or interesting?

Yes No Thank

Re: Drill bit size for spot welds #4
nicholas74 Nicholas Stinziani New Britain CT, USA Sign in to contact 1967 MG MGB GT Special 1974 MG MGB	Topic Creator (OP) Mar 15, 2010 03:57 PM Joined 16 years ago 359 Posts

They don't sell spot weld cutters at Lowe's in case you didn't know confused smiley

Reply

Was this post helpful or interesting?

Yes No Thank

Re: Drill bit size for spot welds #5
NOHOME P P O, ON, Canada Sign in to contact 1967 MG MGB GT "Maggie (GT From Hell)"	Mar 15, 2010 04:02 PM Top Contributor Joined 19 years ago 19,051 Posts

5/16" is the answer. I have a drill bit that is sharpened to a flatter tip so it does go through the second panel. I pre-drill with an 1/8" bit to keep the larger one on track. Filling the 1/8" pilot hole is a trivial matter with the MIG and I think it helps with the penetration.

Pete

Reply

Was this post helpful or interesting?

Yes No Thank

Re: Drill bit size for spot welds #6
nicholas74 Nicholas Stinziani New Britain CT, USA Sign in to contact 1967 MG MGB GT Special 1974 MG MGB	Topic Creator (OP) Mar 15, 2010 04:39 PM Joined 16 years ago 359 Posts

Thanks peter and by the way I love your avitar:eyepop: Where can I get a poster for my garage? Oh ya and how did you sharpen it flatter.

Reply

Was this post helpful or interesting?

Yes No Thank

Re: Drill bit size for spot welds #7
Sinewave T. Keith Vezina Kenner, LA, USA Sign in to contact	Mar 15, 2010 05:19 PM Top Contributor Joined 20 years ago 2,398 Posts

I saw a youtube video of a guy flattening a drill bit to make a spot-weld remover. I wish I could give you a link but youtube is blocked here at the office.

T. Keith Vezina
British Motoring Club New Orleans
1976 MGB, 1976 MGB Trailer & 1978 MGB V8

Reply

Was this post helpful or interesting?

Yes No Thank

Re: Drill bit size for spot welds #8
NOHOME P P O, ON, Canada Sign in to contact 1967 MG MGB GT "Maggie (GT From Hell)"	Mar 15, 2010 05:24 PM Top Contributor Joined 19 years ago 19,051 Posts

Nicholas:

I just use a grindstone and resharpen with a flatter angle on the tip. It is easier than you think really.

As to the avatar. I also have thought of purchasing the poster but the price is not cheap.

http://images.google.ca/imgres?imgurl=http://artfiles.art.com/5/p/LRG/11/1170/VUHU000Z/david-perry-pin-up-girl-rat-rod-blow-torch.jpg&imgrefurl=http://www.art.com/products/p10224995-sa-i2045531/david-perry-pin-up-girl-rat-rod-blow-torch.htm&usg=__l4EXW9uhah74OXFhd0yUq0gU5Qo=&h=300&w=400&sz=29&hl=en&start=1&itbs=1&tbnid=8tr7bhc9c29s5M:&tbnh=93&tbnw=124&prev=/images%3Fq%3DPIN%2BUP%2BGIRL%2BWITH%2BTORCH%26hl%3Den%26gbv%3D2%26tbs%3Disch:1

Reply

Was this post helpful or interesting?

Yes No Thank

Re: Drill bit size for spot welds #9
underdog Jim Underwood Pittsburgh, USA Sign in to contact 1972 MG MGB 1980 Triumph TR8 "Fabulous Trashwagon" 1999 Chevrolet Corvette "Darth Vader" 1999 Chevrolet S10 "Spare Change" & more	Mar 15, 2010 05:49 PM Joined 18 years ago 10,355 Posts

I use a cutter that has an 1/8 bit in the center to act as a pilot. I agree that 5/16 usually covers it. On places like the bottom where you can get at it, I sometimes just use the angle grinder to grind em down thin enough that the air or hand chisel will peel off the top layer. I have some really heafty putty knives I got at a local builder supply store that work good. Just a matter of finding the easiest way to separate the panels with the least damage to the one being reused.

Reply

Was this post helpful or interesting?

Yes No Thank

Re: Drill bit size for spot welds #10
NovasTaylor Tim Williams Raleigh, NC, USA Sign in to contact	Mar 15, 2010 06:53 PM Top Contributor Joined 21 years ago 2,854 Posts

I'm using this one from Northern Tool. If you have a store near you they will ship to store with no shipping fee.

http://www.northerntool.com/shop/tools/product_200326877_200326877

Tim W.
80 MGB LE "ZOM B"
73 MGB GT "Royale with Cheese"
"Modern cars - they all look like electric shavers." - Marv (Sin City)

Reply

Was this post helpful or interesting?

Yes No Thank

Re: Drill bit size for spot welds #11
Gromit Larry Heaps Street, MD, USA Sign in to contact 1974 MG MGB "74 Moss"	Mar 15, 2010 08:46 PM Joined 20 years ago 1,108 Posts

Would these help? You can buy carbide ones at any store that sells machining supplies.
http://cgi.ebay.com/5pcs-6-HSS-Center-Drill-Countersink-Mill-Lathe-1-2_W0QQitemZ220539570290QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item33592ec872

Reply

Was this post helpful or interesting?

Yes No Thank

MGB & GT Forum

Drill bit size for spot welds

To reply or ask your own question:Members Sign InorCreate an AccountRegistration is FREE and takes less than a minute

To reply or ask your own question:

or

Registration is FREE and takes less than a minute