6 replies to this topic

[Bdshim]

So I'm at the point to start removing some rusty pannels looking at spot weld drill bits seems to be two types, the normal looking drill bit type and one with teeth like a mini hole saw which is the best from other people's experiences.
Cheers ?

[luismx123]

Ive used the second type - mini hole saw with a spring loaded point. Worked really well to be fair, pretty straight forward, but I think its better suited for metal work that wont get re-welded/repaired. I used it to remove the lip on my bonnet to convert to a mk1 grille from the mk3/later types. They dont last extremely long and after drilling out all the spots on the bonnet I had to flip the cutter one time as it was getting dull. 

[Gilles1000]

I am using the first type. Flat head with a centering pin. 

Works very well and does drill nice round holes with very minimal burrs.

 

I have two of them, one quite cheap (less than 10€), the other one from Würth, for a little more, which seems to work better. 

Then there are some for 30+€ available, but I can't say anything on them.

 

The first one is curently reshaped as it wore out quite quickly (made a lot of holes too...) and it's about 5 quids too recut it.

 

I don't know about the second type, they seem qualitatilely better,

 

Hope this helps.

Gilles

[Tupers]

I use these ones. https://www.dtc-uk.c...weld-drill.html

They’re pricey but very effective and can be sharpened on a good square bench grinder stone. Always centre punch weld and then go in with the Dormer bit with a little cutting oil on it and keep the bit square to the panel.

[mini13]

its worth gettiing the cobalt one like linked above by tuppers,

 

Ive found they last well if you use them in a cordless on low speed so they dont get hot.

[Bdshim]

thanks all much apricate the input il go for the normal drill bit type

[Homersimpson]

Another vote for the cobalt ones, the hole saw ones tend to be quite fragile if the spot weld is on an edge (like a mini wing for example).  I used to find they broke reguarly whereas the cobalt ones are really tough and last for ages.