drilling brass?

[ptjw7uk]

You just need to remove the sharp cutting edge, use oil stone or diamond file.
Only problem then is they are not much use for steel!
Mind you if you keep breaking them you will have enough for a separate brass set.
I always thought the cz bass was worse for snactching than plain brass.
peter

[irving2008]

hmmm I wonder then if I could repurpose the broken end, its still got about 20mm of fluting on it... i'll need to regrind the point but I reckon I could manage that using the diagram... well I can't do any worse I suppose....

[dickieto]

hi irving
i usually take the sharpness off of a drill by holding a sheet of wet and dry on a flat surface with a little light oil on it and rub the cutting edge untill the sharpness is off of it,
i also push the drill bit into some soft soap for lubrication,may seem a bit mad but it seems to work for me in brass.
Tom

[Peter Griffin]

Irving

Thats what I mean't the cetting edge needs to be removed as in Robin's picture.

[Robin Hewitt]

Just had a thought.
Mentioning no names, I bought some cheap Jobber drilll bits on ebay, supposedly 'quality' items.
After the first 2 sizes snapped on the first hole attempted the rest went in the bin.
Maybe your trouble is naff drillls and what you really need is a Dormer?

[irving2008]

Strangely I nearly bought some cheaper jobber drills, then changed my mind and got some dormer ones off eBay... twice the price, but probably last more than twice as long. The current drills are from a drill set from one of the usual sources...

[Wobblybootie]

OK, I give up ... what's the difference between a 'jobber' and a Dormer' :confused: ... I think a 'jobber' is supposed to be L =10 X dia (when new) but any more and I am lost ... If I want to drill a 7mm hole I grab a 7mm drill bit ... Yes I know my lack of engineering knowledge makes me a Neanderthal knuckle dragger ..

[cropwell]

I thought you might be interested in some special purpose drills
From left to right
45 degree hole
next two for corner drilling
middle one for approximation drilling
three on the right are straightened flute, for when you just want to unwind

Dont ask me how they happened, they aren't mine. Mine just break !