Metal cutting Countersink Bit needed.

[mahking51]

Hi All,
I just wondered if anyone can point me in the right direction to get a METAL CUTTING 90 degree Countersink bit that will go in my pillar drill?
I need to c/sink some slotted screw heads flush into a piece of 3mm guage plate and have bodged it so far with a woodworking bit which justs gets hot and 'smears' the steel giving a raised lip which has to then be removed. I'm also probably using too high a speed. Said bit is then totally burned and u/s.
When done the screws have a small groove around the heads as the c/sink is larger than needed, looks terrible!
Any thoughts welcome please.
Regards,
Martin

 

[jasonB]

Screwfix do the Ruko ones, J&L do several pages worth from budget to carbide

Make sure you use it on the slowest speed, cutting fluid will also help if they are steel hinges. Your woodworking Csk is likely to be carbon steel you need HSS or better for decent results.


If your guage plate has got very hot it may well have work hardened due to the higher carbon content, think about annealing it before you do more work
Jason

 

[Digit]

Ax do 'em as well, in fact any decent tool shop/supplier will have them.

Roy.

 

[Philly]

Martin
I use a set of these..
Work a dream in metal as well as wood!
Cheers
Philly

 

[Oryxdesign]

If you only got a few to do why not sharpen a large drill to 90 degrees?

 

[mahking51]

Thanks guys!
Philly, just ordered a set. Will let you know how I get on.
Regards,
martin

 

[bugbear]

Hi All,
I just wondered if anyone can point me in the right direction to get a METAL CUTTING 90 degree Countersink bit that will go in my pillar drill?
I need to c/sink some slotted screw heads flush ...

Lee Valley claim that angle is 82°

http://www.leevalley.com/wood/page.aspx ... 2240,42281

BugBear