So I've got these drill bits
  Re: RE: So I've got these drill bits by mike4244 ([quote='Stwood_' pid...)
(03-08-2020, 05:46 PM)mike4244 Wrote: You've been a member since 2003. almost 20,000 posts. Try reversing the drill in the chuck, usually bores better with the sharp end down.
mike

Well not always. For drilling glass you'll want the flat end down with lapping compound between it and the glass.
There is no such thing as too much horsepower, free lunch or spare change ~ anonymous

87% of people say their mental health is good to excellent. The rest are sane enough to know they are lying. ~ anonymous
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  Re: Re: So I've got these drill bits by Redman (That brad point is j...)
(07-02-2016, 11:25 AM)Redman Wrote: That brad point is just what you need for drilling metal. That being because metal is hard compared to wood and the drill doesn't easily bite into the metal so "skating" is an issue but with wood the drill bit can be pressed into the wood so that it doesn't "skate".
..............................
That brad point is just what you need for drilling metal.

No No ..Brad point drill bits are designed for wood and other "soft" materials..To prevent skating, use a center drill, stub drill or center punch. but best to drill a small "pilot" hole...You may be thinking of a "bullet drill" bit for steel and other metals.
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  Re: So I've got these drill bits by Stwood_ (that my grandfather ...)
I tried a bullet drill once. Once. Poor accuracy, lots of blow-out, and kinda loud. 3/10 would not recommend.

/s
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  Re: RE: So I've got these drill bits by Robin Dobbie (I tried a bullet dri...)
(03-11-2020, 02:06 AM)Robin Dobbie Wrote: I tried a bullet drill once. Once. Poor accuracy, lots of blow-out, and kinda loud. 3/10 would not recommend.

/s

Yea.......mine wouldn't penetrate that 12" tree. Uhoh
Steve





 
The Revos apparently are designed to clamp railroad ties and pull together horrifically prepared joints
WaterlooMark 02/9/2020

 When I use the toilet it smells just like fresh brewed coffee!
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  Re: RE: So I've got these drill bits by Timberwolf ([quote='Redman' pid=...)
(03-10-2020, 10:13 PM)Timberwolf Wrote: ..............................
That brad point is just what you need for drilling metal.

No  No ..Brad point drill bits are designed for wood and other "soft" materials..To prevent skating, use  a center drill, stub drill or center punch. but best to drill a small "pilot" hole...You may be thinking of a "bullet drill" bit for steel and other metals.

Oh I've had holes inaccurately located even using center drills, stub drill and center punches. Those small drill for pilot holes are especially prone to wander off location. As for bullet drills for metal I think you are referring to gun drills. For those you definitely need a starter hole of the same size.

Bullet drills? Maybe you are thinking of these.




Yeah I can see that they might be rather noisy and if spun the wrong direction probably would be inaccurate and have lots of blow out.

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There is no such thing as too much horsepower, free lunch or spare change ~ anonymous

87% of people say their mental health is good to excellent. The rest are sane enough to know they are lying. ~ anonymous
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  Re: RE: So I've got these drill bits by Redman ([quote='Timberwolf' ...)
(03-12-2020, 09:31 AM)Redman Wrote: Oh I've had holes inaccurately located even using center drills, stub drill and center punches. Those small drill for pilot holes are especially prone to wander off location. As for bullet drills for metal I think you are referring to gun drills. For those you definitely need a starter hole of the same size.

Bullet drills? Maybe you are thinking of these.




Yeah I can see that they might be rather noisy and if spun the wrong direction probably would be inaccurate and have lots of blow out.

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I can see the image if I quote reply. Lets see if it sticks when I hit Post
Steve





 
The Revos apparently are designed to clamp railroad ties and pull together horrifically prepared joints
WaterlooMark 02/9/2020

 When I use the toilet it smells just like fresh brewed coffee!
fredp 02/13/2020







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  Re: RE: So I've got these drill bits by Redman ([quote='mike4244' pi...)
(03-10-2020, 10:38 AM)Redman Wrote: Well not always. For drilling glass you'll want the flat end down with lapping compound between it and the glass.

I'll have to try that sometime.  Valve lapping compound, or some other?
Steve





 
The Revos apparently are designed to clamp railroad ties and pull together horrifically prepared joints
WaterlooMark 02/9/2020

 When I use the toilet it smells just like fresh brewed coffee!
fredp 02/13/2020







Reply
  Re: RE: So I've got these drill bits by Stwood_ ([quote='Redman' pid=...)
(03-18-2020, 08:19 PM)Stwood_ Wrote: I'll have to try that sometime.  Valve lapping compound, or some other?

Fine valve lapping compound. You can also use a piece of tubing instead of a drill to reduce pressure on the glass.
There is no such thing as too much horsepower, free lunch or spare change ~ anonymous

87% of people say their mental health is good to excellent. The rest are sane enough to know they are lying. ~ anonymous
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  Re: So I've got these drill bits by Stwood_ (that my grandfather ...)
I may have some lapping compound.....somewhere. Haven't lapped valves since......the 70's?
Steve





 
The Revos apparently are designed to clamp railroad ties and pull together horrifically prepared joints
WaterlooMark 02/9/2020

 When I use the toilet it smells just like fresh brewed coffee!
fredp 02/13/2020







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  Re: RE: So I've got these drill bits by Stwood_ (I may have some lapp...)
(03-31-2020, 12:14 PM)Stwood_ Wrote:  Haven't lapped valves since......the 70's?

We lapped valve seat bores all the time at work, into the 80's then went to burnishing. The seats wouldn't stick if the seat bore wasn't perfect. Ruined a $20,000 part if they leaked around the seat. I hated regrinding the laps.
There is no such thing as too much horsepower, free lunch or spare change ~ anonymous

87% of people say their mental health is good to excellent. The rest are sane enough to know they are lying. ~ anonymous
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