What Drill Bit to go for?

P

Paul.M

I've got a bit off drilling to do in 3mm sheet metal at 20mm to fit conduit bushes. At the moment I'm using a 20mm hole cutter and its not doing a bad job of it but I'm sure theres something out there to do it better but without spending a fortune. Options are:-

Stick with the hole cutter £8
Go with a step down drill bit £19
Or a blacksmith drill bit £5

It's more than less drilling a hole in a metal c/u, what do/have you used and what lasts, makes a good hole (oh matron) and is cost effective?

Ps, can't believe I've just asked a question on the forum about drilling holes! Next I'll be asking about exporting earth to a shed :).

By the way DurhamSparks, I don't need any advice from you about hole cutters lol ;);)
 
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Electrician Forum | post electrician forum threads here
Use cutting compound mate, and it will prolong the life of your holesaw. I also predrill the pilot holes.
 
when drilling 20mmm holes in plastic, a hole saw is useless. 10 seconds to cut the hole and 10 minutes to get the crap out of the hole saw. cone cutter every time. for steel, it's just personal choice. could recommend the ex-wife. just by looking at it she could burn a 20mm hole in 3 seconds.
 
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For 3mm, assume its ali? I would drill to 13 with standard bit, then finish with step cutterto 20mm.

Forget a blacksmiths drill, it will snatch like the clappers with a hand held drill.
 
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telectrix said:
when drilling 20mmm holes in plastic, a hole saw is useless. 10 seconds to cut the hole and 10 minutes to get the crap out of the hole saw. cone cutter every time. for steel, it's just personal choice. could recommend the ex-wife. just by looking at it she could burn a 20mm hole in 3 seconds.
Click to expand...

i like cone cutters,but you really need to concentrate on the hole,nowt worse that a hole thats to big for you..:innocent:
 
pennywise said:
these are pretty damn good.

same as this [QUOTE/]

Oh pennywise that looks like the tool to do the job, just bought one online and they have a distributor near me, happy chappy for ten quid plus vat. I owe you a pint (if its any good)

tct-sheet-metal-holesaw.jpg


After I've had a go with this 'tool' I'll 'come' back and tell you all how easy it is to 'penetrate' a 20mm hole into something cold, hard, differcult and unforgiving and I'm not talking abouttelextrix ex wife :):):).
Click to expand...
 
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professional smut if you don't mind :)
 
alarm man said:
and it spits it everywhere once it heats up..not recommended for clean jobs.:ninja:
Click to expand...

"It spits it everywhere once it heats up". I'm talking about drill bits, what are you thinking about? (yes, I'm in one of those moods tonight ;))
 

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What Drill Bit to go for?
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