drill bits

[Stubby]

Been in a toolroom for the first part of my working life . Dormer all day long .

[dig-dug-dan]

Using a battery drill. One instance is trying to drill out for a helicoil in a bearing housing.

I have a tormek drill sharpener, so sounds like I need to avoid the cobalt, and stick to your recommended suggestions!

[aspenarb]

Been in a toolroom for the first part of my working life . Dormer all day long .

 

Dormer morse taper for sure on the mill or lathe from 1/2"up to 3" but some of the cheapy sets up to 13mm are not that bad. The cheapy blacksmith ( reduced shank) drills seem to be ok considering they are mainly used in the gut buster.

 

 

 

These cheapy`s are used regularly ,as long as the pressure is kept on , ran at the correct speed and lube used them are ok. Its easy with these variable speed drills to end up running too fast and rub off the cutting edge.

 

[fastrac]

dormer or good black smith bits most of the colbolt and hard drills are very brittle and snap to easy

[Macpherson]

Hi, it's worth mentioning that engineers cutting compound should always be used when drilling or machining metals, it makes a tremendous difference to cutting ability and tool life, Rocol or Trefolex for instance.

Dormer HSS etc for me too, the drills from Screwfix and the like are toy town in comparison, also as said, if you've got decent drills it's worthwhile learning how to sharpen them, cheers.

[Gary Prentice]

Dormer mostly

[Stubby]

Hi, it's worth mentioning that engineers cutting compound should always be used when drilling or machining metals, it makes a tremendous difference to cutting ability and tool life, Rocol or Trefolex for instance.

Dormer HSS etc for me too, the drills from Screwfix and the like are toy town in comparison, also as said, if you've got decent drills it's worthwhile learning how to sharpen them, cheers.

 

Rockol and Trefolex for hand tapping . Slurry for milling and turning .

[aspenarb]

I have given up on the drill "sets", we have a few here using them and I have found all the common sizes get broken/lost or irretrievably blunt. Under 10mm you cant beat these boxes of hss drills which are typically the ones that get trashed. Just taken a look and I need to order another, they represent excellent value, worth having even if you just want to top up your set.

 

 

170pc HSS Engineering Drill Set Precision 4241 HSS Steel 1 - 10mm Steel Case | eBay

 

 

 

[Gary Prentice]

You're lucky if you only lose drills from a set.

 

In our place, you can't even find the set.

[aswales]

I buy from Engineering Cutting Tool Supplier | Cutwel Ltd, they have a great range including ones that will drill hard materials...