I used those sizes as an example and my friend that wanted to enlarge the hole wasn't drilling all the through.A) there is no such thing as a drill "bit" you don't want just a bit of the drill do you? There are screw machine, jobber, aircraft, coolant thru, Carbide,......but in certain you don't care about proper identification of drills.....
You might look for piloted drills, but a drill with .004 (4 thousandths) difference between the pilot and the body will be a custom ground item.
Look for a screw machine drill of the size you want. I might even look for a double margin drill.
Why are drilling out .004 (4 thousandths) that should make no difference in bore size vs performance. Besides you will kick up a bur on the ID of that barrel...
If what 99% of people call "bits" aren't "bits", but "drills", then what do you call the device that holds them?A) there is no such thing as a drill "bit" you don't want just a bit of the drill do you? There are screw machine, jobber, aircraft, coolant thru, Carbide,......but in certain you don't care about proper identification of drills.....
You might look for piloted drills, but a drill with .004 (4 thousandths) difference between the pilot and the body will be a custom ground item.
Look for a screw machine drill of the size you want. I might even look for a double margin drill.
Why are drilling out .004 (4 thousandths) that should make no difference in bore size vs performance. Besides you will kick up a bur on the ID of that barrel...
A drill motor , in particular a battery operated drill motorIf what 99% of people call "bits" aren't "bits", but "drills", then what do you call the device that holds them?
For example, what would you call this?
View attachment 239573
This is a radial arm drill press, not a bit holder hole maker thingies I have run drill (presses) this sizeIf what 99% of people call "bits" aren't "bits", but "drills", then what do you call the device that holds them?
For example, what would you call this?
View attachment 239573
Eh, I've seen bigger...This is a radial arm drill press, not a bit holder hole maker thingies I have run drill (presses) this size View attachment 239619