7 replies to this topic

[rally1380]

As title really folks......which ones are best?

 

I've had ones from Machinemart in the past with the spring loaded spike in the centre and didn't think much of them..........is there a better option?

[Tupers]

I use Dormer bits. They're a bit pricey but last well and can be resharpened. Clicky

[Daz1968]

I also use dormer drills, But I purchased the cobalt ones as they seem to last a little longer.

[rally1380]

Tupers / Daz1968..........thankyou, will order some now.

[1984mini25]

You don't even need to bother buying one, providing you have a bench mounted grinder.... (towards the bottom of the page) http://retrorides.pr...ad/65793?page=5

[tiger99]

In some cases you don't even need one. Just drill about 7mm through both pieces of metal with a normal good quality drill bit. Plug weld through the old drilled panel on to the new, which will not have a hole.

That obviously only works in places where you can do the welding that way, such as outer sill to floor and to door step, where you can do the drilling and welding from above. But the ends, jacking point and slinging bracket stiffness complicate things and certain bits of the old panel may need to be ground off.

[rally1380]

Agree with the above comments about 'normal' drill bits, but as we all know, there are 'drill bits' and there are goooood 'drill bits'..........of which the later cost a bit more (no pun intended).

 

Drilling right through in this case isn't possible or desirable hence wanting to do the job subtly. 

 

Cheers for the link to resto rides though 1984mini25.....that's my lunch hours taken care of!!!

[tiger99]

I have noticed that the Titanium Nitride (TiN, not to be confused with Tin) coated drill bits are usually best for drilling steel. Toolstation or Screwfix have lots of them, as do B&Q etc. They are a yellow colour. But as well as the coating they need to be made of best quality steel and properly ground. Buy cheap, buy twice...