IanMc Posted February 9, 2018 Share Posted February 9, 2018 (edited) Can any of you recommend the best type/style and size of spot weld drill(s) for our cars please? I would rather buy on recommendation, than take a chance on something that might do the job and last for 5 minutes being burning out. As always, your help and guidance is appreciated. Thanks in advance Edited February 9, 2018 by IanMc Quote Link to comment Share on other sites More sharing options...
bris jas Posted February 9, 2018 Share Posted February 9, 2018 Ian, Go with 8mm cobalt spot weld drills, you will need a few if your drilling most of the welds needed, on Ebay i bought a pack of 10 for around £22.00. 1 Quote Link to comment Share on other sites More sharing options...
®evo03 Posted February 9, 2018 Share Posted February 9, 2018 Great job, bought a pack of five, only on number 2, after about 100 spots, Think i burned no 1 out, learned a lesson, let it cool between welds, the bit will last longer. Cobalt, is the way to go, well worth it. 1 Quote Link to comment Share on other sites More sharing options...
IanMc Posted February 9, 2018 Author Share Posted February 9, 2018 Cheers lads, appreciate the advice 👍 Quote Link to comment Share on other sites More sharing options...
robah Posted February 9, 2018 Share Posted February 9, 2018 You should use a slower speed when using cobalt drills, it will keep them cool. We used them on aircraft to cut Jo-Bolts out. Quote Link to comment Share on other sites More sharing options...
H-400 Posted February 9, 2018 Share Posted February 9, 2018 Love this topic, @robah: did this so many years ago on a starfighter F104...(sorry of topic) 2 Quote Link to comment Share on other sites More sharing options...
mantasrme Posted February 11, 2018 Share Posted February 11, 2018 I have both the standard type spot weld drill bits but also recently bought one of these http://www.ebay.co.uk/itm/111987092104 (but not from ebay) Its really good if the spot weld isn't on the flatest panel on the world, which a lot aren't. The standard ones are hard to keep in the right place someimes and skate around rather than dril a neat hole. With this type you use a centre punch then the sprung pin in the tool sits in the hole and you slowly bring the teeth down to cut. Works really well and although its not cheap it does come with a whole load of replaceable cutting teeth and if used slowly with a cooling/cutting fluid they will last forever. I'm still on my first cutter and its done laods already Quote Link to comment Share on other sites More sharing options...
IanMc Posted February 11, 2018 Author Share Posted February 11, 2018 54 minutes ago, mantasrme said: I have both the standard type spot weld drill bits but also recently bought one of these http://www.ebay.co.uk/itm/111987092104 (but not from ebay) Its really good if the spot weld isn't on the flatest panel on the world, which a lot aren't. The standard ones are hard to keep in the right place someimes and skate around rather than dril a neat hole. With this type you use a centre punch then the sprung pin in the tool sits in the hole and you slowly bring the teeth down to cut. Works really well and although its not cheap it does come with a whole load of replaceable cutting teeth and if used slowly with a cooling/cutting fluid they will last forever. I'm still on my first cutter and its done laods already Thanks for that. To be honest that was the reason why I started this thread, as I had seen those advertised. Now I am back to being undecided I might just get one of each type and see how they compare. Thanks again everyone. Quote Link to comment Share on other sites More sharing options...
mantasrme Posted February 11, 2018 Share Posted February 11, 2018 The kit that i linked to has one of the standard style drills in it for some reason, not sure of the quality as i have not used it yet. 1 Quote Link to comment Share on other sites More sharing options...
andyc Posted February 12, 2018 Share Posted February 12, 2018 I use these, 6mm and 8mm with an air drill on a slow speed. I always dot punch the spot weld first http://www.sealey.co.uk/PLPageBuilder.asp?gotonode=ViewProduct&method=mViewProduct&productid=13428&productdescription=spot weld drill&productcode=&category=0&catgroup=&catmicrogroup=&analysiscode=&requiredresults=16 Quote Link to comment Share on other sites More sharing options...
IanMc Posted February 12, 2018 Author Share Posted February 12, 2018 Another vote for Cobalt then Thanks for your input Andy Quote Link to comment Share on other sites More sharing options...
H-400 Posted February 13, 2018 Share Posted February 13, 2018 Thanks for all that info, I need to replace a swann-neck on my GSI (the one that wasn't replaced during the restoration) and I am more a mec than a bodyworker... Grts, Herman Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.