Drilling out spot welds

[Brabham]

Hi,

    just bought some spot weld drills and wondering if I need to use any cutting fluid when drilling out the spot welds. Anyone have any thoughts on this? Cheers.

[FLEXZED]

hey brabham

 

if yolu are talking about these i have bought one and a few extra cutters as you will need them

 

i didnt use any cutting fluid, and they worked great

 

Loui

 

http://cgi.ebay.com.au/HSS-3-8-10mm-ROTARY-SPOT-WELD-WELDER-DRILL-CUTTER_W0QQitemZ380217996825QQcmdZViewItemQQptZAU_Welding?hash=item5886c23619

[zzzzed]

no cutting fluid is needed

[nat0_240_chevZ]

dont run drill too fast whatever you do........ keep it nice and steady, over revving cooks the metal and it goes harder aswell as softening the bit itself, same goes for all drilling

[Brabham]

Any recommended RPM to keep it below on the drill nato? Yep I managed to heat treat a broken off bolt before by continuosly trying to drill it out. Had to resort to a cobalt drill to drill through the damn thing! Reason I ask is that guy at bunnings recommended the cutting fluid. Would I get more life out of the bits by using it? Cheers.

[Brabham]

Loui I bought different ones off ebay as well. Will give them a try on the weekend as I am replacing the sills on my Golf . They are rusted through!!!

 

[Veloce]

Also thought i'd add the allen key screw on the end of the spot weld cutter can be adjusted to prevent the cutter working its way through both panels. If you set it up right you can release the spot weld without cutting into the back panel.

 

I find its best to start off with a fairly slow drill speed until there is a decent groove then you can lay into it a bit more.