[time-nuts] Machining some aluminum help!

Bob Darlington rdarlington at gmail.com
Thu May 18 13:03:47 EDT 2017

Ask them what they'd do it for without the tapping.  Normally I'd do
something like this for free but 40 tapped 4-40 holes in heavy wall
aluminum is a pain.  It would be a miracle if I didn't break the tap off at
least once.  Last time was for a resonant cavity amp (23cm band) and I had
to soak my cavity ring in nitric acid for a month to get the tap out.

At least it's not steel.


On Thu, May 18, 2017 at 10:54 AM, <cdelect at juno.com> wrote:

> Hi,
> I have a square aluminum tube 5" X 5" with a .25" wall it's 8 1/2" long.
> I need 20 holes in each end tapped for 4/40 and 1/2" deep.
> This is for a Rubidium project.
> The local machine shop want's $360.00!!!!
> Anyone have a machining setup that could do the work a bit cheaper?
> If not I'll give it a try myself.
> Please contact me off list.
> Thanks!
> Corby Dawson
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