Re: [gingery_machines] new article available: Drill, Tap, and Counterbore

 

The alternative is to a counterbore is to grind an ordinary twist drill so there is no angle, other than relief, and the drill will finish a hole to a flat bottom.

Malcolm

I don't suffer from insanity I enjoy it!

--- On Wed, 6/1/11, Ron Thompson <ron@ourcadguy.com> wrote:

From: Ron Thompson <ron@ourcadguy.com>
Subject: Re: [gingery_machines] new article available: Drill, Tap, and Counterbore
To: gingery_machines@yahoogroups.com
Date: Wednesday, June 1, 2011, 2:28 AM

 

On 5/31/2011 7:24 PM, RG Sparber wrote:

>

> This is another article in my series for people new to our hobby. It deals

> with drilling, tapping, and counterboring a hole for a Socket Head Cap

> Screw

> using the technique called match drilling.

>

> If you are interested, please see

>

> http://rick.sparber.org/dtc.pdf

>

> Comments and questions are welcome. All of us are smarter than any one of

> us.

>

> Rick.

>

Nicely done. One small criticism.

<soapbox>

End mills should not be held in drill chucks. I know, everyone does it.

But your articles are aimed at newbies.

End mills are as hard or harder than the drill chuck jaws. This can and

does do damage, especially if it slips.

The right tool for this operation/in this machine/ is a piloted

counterbore. They have the advantage of a ofter shaft and a removable

cutter. This is handy for reverse counterbores where the tool is pulled

into the work from the opposite side.

On the other hand, if the machine you were using was a mill, and it had

the right holder for the endmill, your operations would be appropriate.

</soapbox>

Now I'll quit being anal.

--

Ron Thompson

On the Beautiful Florida Space Coast, right beside the Kennedy Space Center, USA

There are two kinds of posts on newsgroups.

1. This is what I have done...

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http://www.ourcadguy.com/

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