Step drill bit

[stealthwolf]

I would appreciate some advice here. My portable barbeque (smokey joe) is a bit rubbish. I've done some reading and the gist is that because the vents are in the sides rather than bottom, air moves over the coals rather than through them.

Quite a few people have modified their barbeques by drilling 20mm holes in the base of the barbeque. They've all used step drills to achieve this.

I've been looking online and there are lots of different types from cheapo Erbauer to expensive Irwin unibit. Would the cheapo drill bit do for drilling through porcelain enamel?

I've also seen dewalt's impact driver step bit. How does this work?

 

[SlipperySid]

Some of the Erbauer stuff is as bad as Silverline. I don't think the steel is up to much on some of their drill bits.

 

[vards01]

I think I'd go with a fine toothed hole saw they're about £14 for a 20mm on ebay if you already have the arbor. Some of the cheap stuff can be very aggressive on thin sheet metal, as I found out when drilling a 38mm for tow bar wiring on a car body! The proper step / cone cutters are very expensive hence I opted for a fine tooth hole saw.

 

[nickjb]

I've got this one: https://www.amazon.co.uk/Bergen-Professional-Piece-Steel-4-32mm/dp/B006B3NOLM it's actually pretty goid for the money. Used it lots and always gives a nice clear hole. Might be cheaper on ebay

 

[lostinthelight]

Enamel does take the edge off cutting tools very quickly so could be an expensive hole?
litl

 

[JimCrow]

http://www.toolstation.com/shop/p73155?table=no