Torque arm bolt

[Tapio]

Thanks Tapio, really useful stuff

Assuming of coarse you have a 6.8mm, 8.5mm or 10.2mm drill bit !!

DT

As raven says, you should buy the drill bits that you need for tapping metric holes.

But what if it's late saturday night and you have a strong craving to do a M8 tapped hole?
Can't find your 6.8 mm drill bit?
Your local waterhole for drill bits' manager is reluctant to open up his shop for you to buy a drill bit?

Bring out your drill bit set. They typically come in increments of 0.5 mm.
You take the 6.5mm drill bit and grind one of the cutting edges slightly longer than the other.
This makes the drill bit wobble thus making the hole slightly larger.
It's tricky to know just how much longer the egde needs to be, so you should always try it on a scrap piece first.

Also, you cannot do this by starting out with a small drill bit, and enlarge the hole in steps with bigger and bigger drill bits. The final drill bit won't wobble then.

[Corvus]

...........As raven says........

Raven loony more like.

http://en.m.wikipedia.org/wiki/Corvus_(boarding_device)

For no particular reason other than the story surrounding the device fascinated me. Also the irony that they only got away with it, when it mattered, because the seas were particularly calm that year. Brilliant.

[Tapio]

We have a mountain here in the middle of Gothenburg, that's called ramberget.
Berg = mountain in swedish. But ram? What's that?
It turns out that the old nordic word for raven was ram, or ravn, depending on dialect.
So, probably that mountain had a lot of raven nests way back long ago.

And probably, that loan word got snuck into the anglo-saxon language with the vikings that colonised the northeastern england some 1200 years ago.

Oddly enough, the word for raven, in swedish is korp. Don't know, but i suspect its' a loan word from the french corbeau, which is in turn a loan word from latins corvus.

[Corvus]

We have a mountain here in the middle of Gothenburg, that's called ramberget.
Berg = mountain in swedish. But ram? What's that?
It turns out that the old nordic word for raven was ram, or ravn, depending on dialect.
So, probably that mountain had a lot of raven nests way back long ago.

And probably, that loan word got snuck into the anglo-saxon language with the vikings that colonised the northeastern england some 1200 years ago.

Oddly enough, the word for raven, in swedish is korp. Don't know, but i suspect its' a loan word from the french corbeau, which is in turn a loan word from latins corvus.

Fascinating stuff tapio. Cheers.