[time-nuts] Machining some aluminum help!
jimlux at earthlink.net
Thu May 18 13:17:38 EDT 2017
On 5/18/17 10:03 AM, Bob Darlington wrote:
> 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.
Very much so.. 40 tapped holes is a lot of holes
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.
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