Hole cutting...
Turbo Mini Forums

My new bonnet has arrived and I want to cut some holes in it again for my intercooler!

The last time I cut the holes I used one of them circular saw thingys with the pilot drill in the middle, seemed to do the job but it doesn't do the neatest job!

Has anyone tried usng one of them holes punches with any success, bearing in mind it has to cut on a curve?

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

You mean a Q max cutter, these are very good but as you say theres a curve. A holesaw is your only choice. Youll just have to file it up afterwards.
Paul

I seriously doubt it!

you could try an angle grinder, or plasma cutter but the hole saw will be neat ish compared

A good quality hole saw is best, the solid metal ones, not the spring steel type ones.

They make a neat job usually. Try get one that comes in for other things, i.e. 2"

i've had good success with stepped drill's, but that was on flat stuff...

as in these:

Yea thats what was used last time. The bonnet was shagged anyway so I was to bothered about finish!

Just weighing up my options before cannibalising my bonnet, looks like theres not much to weigh up though. Lol

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

If you drill a pilot hole, and use a hole cutter ( like above ) with a soild bar for a pilot, they work a little better.

Sometimes relying on the drill bit to hold centre isnt as good as it should be.

But it is just a case of filing it up afterwards.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Place the bonnet on a piece of wood, if you can get one that has a similar radius to the bonnet so much the better.

This will support the bonnet and also help to guide the pilot an give a better result.

Every day is a school day ...........

How fast and how expensive ...... the same question...

Stepper drills do give a neater cut. Not sure how big you can get them tohugh, the biggest I have is 32mm

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

I use one of above, but mine is yellow!, so much better

Team Racing

I got my step drills from work (read 5 finger discount )

i have them in 1mm steps 4-12mm, 10-20mm, 20-30mm and 30-40mm

Havent seen any Bigger than that yet though and the work bloody well!!

in fact i used the 30mm one in a lathe to take the bulk out of the Ally bar i used for the manifold for the 7 port, thats 4lots of 70mm...