From: none@none.com99
On 1/17/2026 10:52 AM, Bob La Londe wrote:
> On 1/17/2026 10:39 AM, Joe Gwinn wrote:
>> On Fri, 16 Jan 2026 17:28:29 -0700, Bob La Londe
>> wrote:
>>
>>> I've machined 7075 before using speed and feed calculations on one of
>>> the CNC mills, and it machined just great.
>>>
>>> The other day I machined some 7075 manually on the lathe to make some
>>> mold inserts (for quick ship it was actually cheaper than other options
>>> in the size I needed).
>>>
>>> Dang its tough stuff. I had to look it up again. Its stronger than
>>> some steel alloys, and it machines like it.
>>
>> It also rings like hardened steel, and so is what movie prop sword
>> blades are made of.
>>
>> Joe
>
> I offer one mold with either stainless inserts or at a lesser price
> aluminum inserts. Usually 6061-t6 aluminum. Its less about material
> cost than machining difficulty. I was out of the right size 6061, so I
> priced small quantities from different vendors for quick shipment. The
> 7075 (probably old stock) was the cheapest for a six foot stick. I may
> order some more before they run out of the old stock.
>
> After working with it, and determining its general toughness I may
> consider pricing it in multi rod quantities and discontinue stainless as
> an option. Its not as tough as 304, but its tougher than any mold steel
> I have worked with.
MILD, not mold. Most mold steels are quite tough, and hard. The
minimum is probably 4140HT, and most others for high production are much
harder.
>
> I was not aware of a brittleness property, but that may be a function of
> treatment. It is used for multiple firearms actions including for home
> builders in the rather brutal 1911 series. Of course it was the magic
> answer to toughness and corrosion resistance for the M16A1 in Vietnam
> over previous alloys.
>
--
Bob La Londe
CNC Molds N Stuff
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