[time-nuts] Machining some aluminum help!

Chris Albertson 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
> >
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-- 

Chris Albertson
Redondo Beach, California


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