135 deg Drill Points

[Paul90]

I have used the search tool - honest but I can't find the simple answers I'm looking for.

My latest project has highlighted how pathetic my current drill selection is. I'm going to get some decent ones - probabaly Dormer. Either the A002 or A777 range.

I must admit I'm still trying to get my head around the various angles and options with drill points but I assume the 135 deg split points will:

Require less pressure and therefore be less likely to break.
Cut more slowly and therefore be more controllable / accurate in sheet when using a hand drill (guessing here)
Be able to cut harder materials than with a 118 deg point.

So is the only advantage of the 118 deg point faster cutting in soft materials ?

For a 6.0mm drill I'm looking at £4 (A777) vs £1.35 (A002).
If the A777 last 4 times as long and can also be used for harder materials then they have got to be worth it.

Can someone with some first hand experience point (sorry) me in the right direction please ?

Many thanks

Paul

 

[wyn]

Using ordinary drills in sheet can leave you with an odd shaped hole. The conical shaped step drills seem to be pretty good if you are doing a bit on sheet metal.

 

[snowcat]

Lip angle also has an affect on the drill geometry, less relief is used for together materials, 118 with 12 Degrees relief is soft materials or sheet work, The 135 deg with 5-9deg relief would be you general all round type drill...

BTW you always get what you pay for with drills well worth spending a few quid on some decent ones.