[Boatanchors] Drilling Holes Questions

[Dale Parfitt]

One thing I would add is never insert the drill into the chuck beyond the shank. The shank is intentionally soft so  if the drill spins it will not ruin the chuck. The drill portion is hardened and  can ruin a chuck.
I have lettered, numbered and fractional drill indexes of nothing but  short drills- to avoid the drift  issue that Glenn spoke of in his mail.

You may  want to invest in a small drill press and there are inexpensive X-Y tables on the market. Nothing like a Bridgeport, but allows for excellent repeatability- especially if you are going to be regularly homebrewing.

Dale W4OP


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Glenn Little WB4UIV
Sent: Thursday, September 22, 2022 10:33 PM
To: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] Drilling Holes Questions

Layout the front, full size, on paper, possibly using graph paper.
Attach the paper to the front panel, possibly using rubber cement.
Using a sharp center punch, punch a dimple into the center of each hole.
Using sharp drill bits in your drill press drill the required holes 
using the punched dimple to keep the drill bit centered.
Insert the drill bit as deeply as you can into the chuck to prevent the 
bit from wandering.

This should provide the required results.

If you can find them, you could use centering bits.
These are normally used on a lathe.

73
Glenn
WB4UIV

On 9/22/2022 7:17 PM, wa9wfa wrote:
> For my first and only large radio project, the HBR-13, I did most of the drilling at work with a Bridgeport Milling machine.  It was like heaven on earth.  I secured the chassis to the moveable table, and simply used the x-y controls to move the table right under the drill bit.  Beautiful and precision work even for a newbie builder like me.
>
> Retired now, no access to the milling machine, and I’m getting ready to build a moderate size 7 or 8 tube superheterodyne receiver.  I don’t have a drill press but I could buy a lower end one I suppose.
>
> I’m looking at mounting 5 or 6 HC-6 ceramic crystal sockets.  I’m looking at the size of the ceramic that fits into the holes and pondering if I can actually drill each socket hole plus the small mounting hole in the center, with any kind of accuracy.
>
> How do you drill with any precision with a low end drill press or hand drill?
>
> I’m just not sure if I can drill those three holes in a row, without breaking metal in-between.
>
> Thanks. 73 Scott WA9WFA
>
>
>
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-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIVwb4uiv at arrl.net     AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
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