Drill Spyhole - Help!

[IMPEX]

Hi

Can anyone advise how best to drill a 32mm hole for a bigger spyhole/camera into a composite door where a 14mm hole already exists for the existing spyhole? I am thinking a spade bit is no good as there is nothing for it to 'bite' into. Any ideas appreciated.

Regards

Asgar

 

[Alarm]

32mm hole saw carefully placed, with a slightly smaller pilot bit is one way.

 

[IMPEX]

Ok, thanks, bit will the hole saw type not damage the exterior of the door? Is there any other way please?

 

[Alarm]

Slow cut from outside, pilot protrudes inside. Now drill from inside, should be no damage.

Padsaw, damage for sure.
A lot of small holes, untidy and damage.


How was the hole cut in the first place?

 

[crank39]

Drill a 32mm hole in a scrap bit of ply, clamp this over the exsisting hole obviously centralising it and use it as a guide for your 32mm bit, once its started you could remove the ply, do this on both sides to eliminate blow out. This is how i would do it.

 

[Charnwood]

Surely the 14mm hole would act as a pilot hole for a spade bit?

 

[Alarm]

Tip of a 32mm spade is not 14mm.
Think about it.

 

[Charnwood]

Think about it.

I have done, but can't see a problem. Care to enlighten me, please.
I know the tip is only about 10mm at its widest point.

 

[crank39]

Well think about it a bit longer then

 

[tinytom]

think cranks answer will be best, because holesaws, flat bits and augers need a center point to start from, otherwise they will make a real mess of the material
hope this helps

tom

 

[Alarm]

Why I said a hole saw with a smaller pilot bit.

 

[orchard222]

What ever you do be very careful, composite chips very easy when drilling holes in the door slab. Not a problem if you have cnc router tho!

 

[Charnwood]

Well think about it a bit longer then

I have done and still can't see it.

I am an amateur. Does it show?

 

[Aulus]

Personally, I would glue in a piece of 14mm dowel, then when set, drill with spade bit.