Which drill bit?

[ni9eofse7en]

It is probably in here somewhere, but what recommendations for drill bit?

ie in wood for the pen blanks I am using a brad point bit

What about...

Acrylic blanks

Polyester Resin blanks

Corian

Thanks in advance for advice

 

[Walter]

For my opinion have a look at page 2 of my guide to drilling on the lathe:

http://www.penturners.co.uk/misc/pdf/Tips/Drilling_Pen_Blanks_on_the_Lathe.pdf

My comments there apply whatever you are drilling (apart from metal obviously).

 

[Woody]

I get all my drill bits from UK drills

 

[Jim]

And of course there is the Colt Drills .. A bit like marmite John, you either love or hate them ..

 

[rayf6604]

I find Colt drills a bit too expensive for me. Like Woody I get my drills from Uk Drills, either directly or on their Ebay shop. I have tried brad point but, because of the shape of the tips, the break out the other side can be a bit risky with plastics. I only use standard HSS metal bits now and find them perfect on all materials including acrylics and corian. However, polyester blanks need even more care to avoid splitting or breakout on the other side of the blank.

 

[mickleuk]

I really like the DeWalt Extreme 2 drill bits when size allows.

 

[paulm]

Extreme for me everytime unless the size isn't available and then it UK Drills.

 

[wm460]

DeWalt Extreme 2 drill bits for me.

 

[Penpal]

DeWalt Extreme2 bits for me.

Peter.

 

[Twister]

i use colt twinlands

Steve

 

[Vic Perrin]

I get the majority of my drill bits from UK drills

 

[bellringer]

I buy high quality hss jobber drill and colbalt as well
But I have a resharpened colt which is amazing

 

[Grump]

I have a vast selection of all sorts and use whatever is the correct size and sharp, I find that usually works for me.

 

[Kawakers]

Is it worth sharpening a drill bit or should i just buy new ?

 

[Grump]

The cheap nasties don't hold an edge so not worth sharpening but yes with a good drill bit.

 

[bellringer]

If you buy high quality drill they will be cheaper in the long run I buy I buy domer ohio and guhring drill about £13 for 15/32 drill I have used it about 500 times and only sharpened it once it will probably last me the next 20 years so it worth pay more as in the long run buying cheap cost more

 

[ni9eofse7en]

Thanks for your replies all, I have a set of HSS Jobber bits and a box of cobalt so will try them.

I wondered about tile cutting or masonary (not on hammer) bits for corian or resin.

Do you use any form of lubricant, water or an oil based one to aid the cut? I do use one when drilling metal with the cobalt bits.

 

[rayf6604]

Thanks for your replies all, I have a set of HSS Jobber bits and a box of cobalt so will try them.

I wondered about tile cutting or masonary (not on hammer) bits for corian or resin.

Do you use any form of lubricant, water or an oil based one to aid the cut? I do use one when drilling metal with the cobalt bits.

There's no need to use any special bits for corian, its a type of plastic after all. Just use ordinary HSS bits and you'll be fine really. That's all I use and they drill it fine. And no, I've never used any cutting lubricant, just keep withdrawing the bit regularly to clear the flutes of swarf, and keep the heat build up down .

 

[wm460]

There's no need to use any special bits for corian, its a type of plastic after all. Just use ordinary HSS bits and you'll be fine really. That's all I use and they drill it fine. And no, I've never used any cutting lubricant, just keep withdrawing the bit regularly to clear the flutes of swarf, and keep the heat build up down .

What Ray said, also drill at slow speed.