How many holes!!

[brightspark]

i see a sprained wrist in your near future

and a few snapped drills as u grit your teeth

 

[paulmitchell1984]

2 speed yes (supposidly) Makita hp2050 is the weapon in question

 

[balmerchris]

Starrett make these. I think they come in 12 mm. This is a 19mm it's excellent in a cordless drill.

 

[balmerchris]

Sorry just checked, the smallest is 15mm.

 

[paulmitchell1984]

Shame they look good.

 

[Kram]

How deep are the holes, are they blind or through?

Grind your bits split point they will cut much better. A rigid machine will also let you grind the drill much sharper. Less pressure and quicker.

I would be using carbide for this, but you need a proper machine not hand drill to get the advantage. And a diamond wheel to occasionally resharpen.

 

[daedalusminos]

Try a good quality step drill, grind off the larger sizes if you can't find one for 8mm

 

[Hitch]

That Makita should be perfectly capable of that. Varible speed as well as geared, speed 2 for 5mm or so pilot, bang in a nicely sharpened 12 on gear 1, should be through a bit of 8mm in a couple of dozen turns

 

[Kram]

Going by a speed chart alone wont be much good, you should be looking at the chips!

If they are thin shavings, you need more pressure, sharper drill or less speed. If they are good thick chips, and you have more speed available, increase it. If the chips are too big and grabbing (using a super sharp drill by hand in alu) need more rigidity or blunt the edge a bit. Steel wont grab, sharp as possible will work much better.

Do like this for more pressure