[time-nuts] Machining some aluminum help!
jimlux
jimlux at earthlink.net
Thu May 18 15:03:37 EDT 2017
On 5/18/17 11:53 AM, jimlux wrote:
> On 5/18/17 11:16 AM, Tim Shoppa 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.
Fixing the table formatting
>
> Threads Fastener
> Engaged Length 0.125 in
> TPI 40
> Diameter 0.112 in
> mean Diam 0.0995 in Root Diam 0.087 in
> Engaged area 0.0391 sq in Area 0.00594 sq in
> Load 200 lb
> Shear stress 5,119 psi Stress 33,644 psi
> Ultimate strength 42 ksi ultimate 74 ksi
> Shear Strength 24,249 psi proof 55,000 psi
> Safety factor 4.74 Safety factor 1.63
>
> Aluminum Steel
>
>
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