anyone on here have the ability to make 2"/51 mm holes in steel plate 4mm or thicker?,i need 2 plates with the hole in the middle,plates aprox 5" X 3"

Easiest way is a Mag drill with appropriate cutter. I have the Mag Drill but not a 51mm cutter which is very expensive mine stop at 48mm and I am a long way from you I suspect.

dont know where you're based but try these
http://www.daysteel.co.uk/

Is this for your decat pipe ?
eBay Item

I cut a few 2" holes in 6mm steel with a holesaw. I cut a hole through some plywood first and clamped it to the steel to stop it from wandering oversize and the wood also helped contain a puddle of cutting fluid. Nice and slow with good quality holesaw.

Why not try a local engineering firm or someone helpful on here with a lathe, a 4 jaw chuck and a boring bar.

Just use a good hole saw you be surprised how easy it is, lots of lube and as slow as the drill will go.

supprised no-ones has mentioned water cut and andy yet.........

cheers for the replies peeps,looks like a holesaw jobbie,any recomendations on a brand/suplier ?

Starrett! I have some of the cheapy ones and they do the job but the Starrett ones have been doing the job for the past 15 years!

I'll second that for starrett. We regularly use these hole saws to cut anywhere from 3mm to 25mm steel. Just remember that you need an A2 arbor for 51mm.

http://www.screwfix.com/p/starrett-a2-arbor/86678


[Edited on 2/5/13 by neilp1]

If it is only to weld in an exhaust tube a plasma cutter will do the job.

quote:

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Originally posted by owelly
Starrett! I have some of the cheapy ones and they do the job but the Starrett ones have been doing the job for the past 15 years!

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must be local company who do laser cutting.

quote:

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Originally posted by dave r
supprised no-ones has mentioned water cut and andy yet.........

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See ebay item: 160568904590 cut thru 6mm plate like butter all you need is an arbour and an mt3 pillar drill

cheers peeps,off to screwfix in the morning