[time-nuts] Machining some aluminum help!
albertson.chris at gmail.com
Thu May 18 17:41:11 EDT 2017
Yes, generally when something is expensive to manufacture it is because the
designer was not thinking about costs. A design with 40 size "tiny" thread
holes in just not cost-effective. A redesign could save hours work.
On Thu, May 18, 2017 at 11:16 AM, Tim Shoppa <tshoppa at gmail.com> wrote:
> I'm very dubious that you need a tapped 4-40 hole to be threaded any deeper
> than 0.25". If you work with the machinist I'm sure you can come up with
> some reasonable spec that does not require a bottoming tap and will save
> you a lot of money.
> I bet you went to 0.25" wall square tubing only because you want to tap the
> walls for 4-40. Alternative designs can let you use much thinner material
> and a very different flange on the ends, but the costs will likely move
> towards welding/brazing rather than machining.
> Tim N3QE
> On Thu, May 18, 2017 at 12:54 PM, <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
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at 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 at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/
> and follow the instructions there.
Redondo Beach, California
More information about the time-nuts