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. -Bob On Thu, May 18, 2017 at 10:54 AM, <cdel...@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 > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
