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Which drill bit should I use?

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Jay Battle

03-26-2000 11:22:38




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I need to drill several holes into hardwood 8mm in diameter only about 10mm deep. The thing is they need to be quite flat at their base to take a plug. As you might have worked out I'm new at this. Any help would be great.
Jay




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Neal

03-27-2000 06:38:25




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 Re: Which drill bit should I use? in reply to Jay Battle, 03-26-2000 11:22:38  
I believe that most of the respondents dont know what size 8mm is. I have never seen a fostner bit or a spade drill that small. I am a tool and die maker and I suggest a two flute center cutting end mill. You can get them for about 3-5 dollars. With the end mill I sugest you would just need to use the endmill no drill or doing the work twice. This is my OPPINION. Neal

ps if you cant find the endmill contact me i'll help

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Paul Fox

03-27-2000 16:02:56




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 Re: Re: Which drill bit should I use? in reply to Neal, 03-27-2000 06:38:25  
Yer absolutely right, never caught the 8mm requirement. Therefore, none of my ideas will work, and an endmill makes a lot more sense.

Sorry, I'll try to read the question a bit more thoroughly next time.



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Fred

03-27-2000 06:21:01




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 Re: Which drill bit should I use? in reply to Jay Battle, 03-26-2000 11:22:38  
Drill all of the holes with a 8mm twist drill but only drill them to 1/2 depth. Then resharpen the twist drill flat bottom and finish drilling with it. You won't have any out of pocket expense plus you will learn how to sharpen a flat bottom drill. Only way to fly.



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Paul Fox

03-27-2000 03:03:29




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 Re: Which drill bit should I use? in reply to Jay Battle, 03-26-2000 11:22:38  
Like Rich says, a Forstner bit is the way to go for flat bottom holes in wood. They provide the best accuracy and the flattest bottom.

If you can't find (or afford) a Forstner bit (they ARE pretty pricey) you can come pretty close with a spur bit. A spur bit will leave a slightly deeper groove around the outside edge of the hole and a pilot hole in the center, but the bottom is flat.

As a last choice, if accuracy is not critical, you can use a spade bit. These are the cheapest, and commonly available in any hardware store and most department stores. The bottom and sides will not be as smooth, and there will be a pilot hole in the center, but the bottom is essentially flat.

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Jeff Pack

03-28-2000 18:11:05




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 Re: Re: Which drill bit should I use? in reply to Paul Fox, 03-27-2000 03:03:29  
define expensive?

Surplus endmills had be had for a couple of dollars...



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Rich(Wi)

03-26-2000 15:15:33




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 Re: Which drill bit should I use? in reply to Jay Battle, 03-26-2000 11:22:38  
A Foerstner (Forstner?) bit will make a flat bottom hole. They are for wood drilling only,
because the cutting edges on the outside instead of the center. Be warned though, those things are not cheap.



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Jeff Pack

03-26-2000 13:36:43




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 Re: Which drill bit should I use? in reply to Jay Battle, 03-26-2000 11:22:38  
If you need it "flat" at the bottom,
then use an endmill instead...



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