Nah. I can't wait that long.
A series of holes drilled just inside the circle or square you wanna cut
and a good file and a bit of elbow grease gets the job done quickly and
neatly.
The sweat and the exercise are very good for you and the job is not
interupted or held up by factors out of your control.
You can have the job done quicker than you can drive to the machine shop.
73, Alek. VK6APK
On 13/09/2013 8:54 PM, Bob Sullivan wrote:
Jim,
I could not agree with you more! Fly cutters should be simply tossed away. For
large holes I pay the freight and take the panel to a local machine shop. For a
few dollars I get pretty large holes at no danger to myself. :-)
73, Bob
WØYVA
http://www.isquare.com/personal_pages/ras-hardware.htm
On Sep 13, 2013, at 8:24 AM, Jim Garland wrote:
My least favorite part of homebrewing an amplifier is making the meter
cutouts and tube socket holes. Last evening I cut three 2.90 holes for
GU-74Bs and survived the experience. I have a set of hole saws, but not
metric ones for Russian tubes, and therefore had to use a fly-cutter. IMHO,
fly-cutters are the most dangerous tool in a workshop. I hate the things. I
securely clamped the sheet aluminum stockl to the bed of a large
(floor-mounted) drill press, set the drill press on its slowest speed, and
used aluminum cutting fluid. One has to advance the fly-cutter VERY slowly
to prevent the cutting tool from grabbing the aluminum. If that happens, the
sheet aluminum is likely to go flying around in a big circle like a sythe.
The other danger is absent-mindedness, which can lead the drill press
operator to reach in with his fingers to remove a piece of aluminum debris.
Fly-cutters should never be used with a hand drill, as I stupidly tried once
as a teen-ager. They absolutely require a large floor-mounted drill press
with a sizeable bed.
73,
Jim Garland W8ZR
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