General drill and dfrilling question

[wxyoung2008]

Hello
I have a small, specialty drilling project whereby I need to drill a 3/4" hole about 1" deep into a piece of metal that already has a 5/8" hole already in it. So basically I an trying to get from 5/8 to 3/4"

In the past I have not been very successful with the stuff from Walmart and Home Depot.

Are there drill bit types designed for this type work that I can use with a regular 1/2" drill ?

Thanks All

 

[2oolhound]

You should use a drill press if you want a clean accurate hole. It's an easy job for anyone with a dp and would cost about the same as buying a drill.

 

[wrenchn]

I would also suggest drillpress


https://www.amazon.com/dp/B00LGZXN0W/?tag=atomicindus08-20

 

[aussiek2000]

Drill press or a mill would be ideal

 

[454ragtop]

If you give up your top secret location, someone here will probably offer to help you with 1 hole. If you're near me, I would.

 

[Teenager with old tools]

If you give up your top secret location, someone here will probably offer to help you with 1 hole. If you're near me, I would.

I second that if you're in Southern California you can stop by and I would help you


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[wxyoung2008]

If you give up your top secret location, someone here will probably offer to help you with 1 hole. If you're near me, I would.

Made me laugh with that one. I am in a little town called Red Oak, 8 miles from Waxhachie, Tx

 

[COO USA]

You can buy a drill bit called a Silver and Deming bit, which is chucked in 1/2 inch, but the drill size can be 3/4 inch. Can buy them at really good hardware stores, industrial suppliers, but if it needs to be a perfect hole, I agree with the rest. Get it in a press.

 

[bczygan]

If the bottom of the hole needs to be flat, you need a mill.

Bill

 

[wxyoung2008]

Thank you all
I have ruined a lot of drill bits prematurely because I don't have a drill press and I believe that it is about time to go ahead and get one.

My brother has been trying to sell me one for some time ..... guess it is time to take him up on it. Unfortunately it will require a nice little drive.
Thanks all

I will explore all of the drill bits mentioned here.

 

[lilredex]

Look for a DP that has a minimum speed of around 200 RPM for drilling in metal. I have an old HF DP that does that.

The pulley system looks like this one.

 

[dwasifar]

Typically for dfrilling I just cut the frills off with a scissors.

 

[Davefr]

Look for a DP that has a minimum speed of around 200 RPM for drilling in metal. I have an old HF DP that does that.

The pulley system looks like this one.

Yes, and the OP will need a very good/secure clamping arrangement. It may also help to start the holes with a countersink prior to engaging the 3/4" bit. (that initial grab can be dangerous if the workpiece is not properly secured)

 

[md21722]

https://www.amazon.com/dp/B000FZ2UOY/?tag=atomicindus08-20

Step drills are easier to deal with if you are hand drilling.

 

[the gypsy]

Picture of the project will make it a lot clearer and you will get more accurate answers..

I also was thinking of the step drill, can be done with a regular drill. But the hole must be through and through.

 

[Cope]

Made me laugh with that one. I am in a little town called Red Oak, 8 miles from Waxhachie, Tx

I didn't know they had electricity in your area!

 

[T45]

https://www.amazon.com/dp/B00LGZXN0W/?tag=atomicindus08-20

This Norseman drill (bit) is shaped especially to drill out larger holes from smaller ones. Its a bit pricy, so keep that in mind. But there are issues with just chucking in a regular bit, and goint at it full bore, mainly due to how the cutting edges are being engaged. So I'd look into the techniqie angle a little bit to compensate for any shortcomings in the bit geometry depending on what you go with.

 

[454ragtop]

You're not drilling a hole an inch deep with a step drill. You guys even read the first post?

 

[Teenager with old tools]

You're not drilling a hole an inch deep with a step drill. You guys even read the first post?

Thank you I was about to say that


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[Danno1]

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Looking from above, the bit will rotate clockwise. When you clamp your work, bump it up against the left side of the column as you're looking at the DP. That way it can't rotate if the bit grabs.



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