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Old 09-09-2018, 09:09 AM
Jon Thompson Jon Thompson is offline
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Default Artz press

OK guys and girls who out there has information/experience with an ARTZ PRESS? Jon
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Old 09-09-2018, 09:10 AM
Jon Thompson Jon Thompson is offline
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Default http://www.coachbuilt.com/bui/a/artz/artz.htm

http://www.coachbuilt.com/bui/a/artz/artz.htm
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Old 09-09-2018, 01:18 PM
crystallographic crystallographic is offline
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Fore-runner of the stretch press.
yes, there are shops using them today.
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"All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919.
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Old 09-09-2018, 03:36 PM
Jon Thompson Jon Thompson is offline
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Kent for some reason I did not pick up on the edge clamping and the buck or die coming upward stretching the sheet. I was aware of that process via Kirkham. They pull the flat sheet to yield first then FORM the aluminum piece. The steel must be very stressed? Thanks Jon
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Old 09-09-2018, 03:39 PM
Jon Thompson Jon Thompson is offline
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Default Link Kirkham

http://www.kirkhammotorsports.com/book_aoe/aoe_18.pdf

Not sure but they may have transitioned to Thermo Forming? Jon
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  #6  
Old 09-10-2018, 02:51 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by Jon Thompson View Post
http://www.kirkhammotorsports.com/book_aoe/aoe_18.pdf

Not sure but they may have transitioned to Thermo Forming? Jon

Hi Jon,
The article you reference sure looks to me like the "all-aluminum" model specifically requested by Larry Ellison -
https://jalopnik.com/5385797/how-to-...aluminum-cobra

They go to a lot of lengths on that "prototype" while a fleet of fresh cobra cars are sitting all around. Good for sales, but some extreme methods - like polishing a door just to file it out? Heck, I've taken a boattail Duesenberg body to 24,000 grit MicroMesh to polish it, and we quit filing at around 180 grit because our billet aluminum sanding blocks made a faster job of perfect. And I used the fine print in the Yellow pages for a reflection test - a way more definitive reflection test than Autoweek ...

I'm not a fan of pick hammers or bullseye knockers.

I like their use of slappers - Kirkham bought a lot of stuff from us back in the years when the brothers were first setting up ... They likely now make their own versions of some hand tools over there.

Soot annealing is not "exact" in its temperatures, but when done properly is good enough.
That car is being made backwards in some areas because it is a one-off and they want "perfect." Ellison told them the first quoted price was not high enough, and to add another few hundred K$. So, you see great lengths being done when there is no production shop that would make a Cobra in that manner, that I could possibly think of.

"blow forming" sheet aluminum is a very nice process, and may now be called "Thermo forming" but it is simply "hot flowing" sheet with hot gas. Specific to aluminum and uses pretty much one alloy - 5086.


Yes, for Artz pressing the steel must be a soft draw quality temper and it ends up nice and hard. Think Model T cowls, and a host of other makes and models of that era.


Now back to work ...
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Last edited by crystallographic; 09-10-2018 at 02:55 PM.
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  #7  
Old 09-11-2018, 03:57 AM
Jon Thompson Jon Thompson is offline
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Default Blow Forming

In the process of Blow Forming (Thermo Forming) is the hot gas used to displace atmosphere to prevent penetration in to the material when in a plastic state? I provided the link to Kirkham as a reference to the connection I had made to the Artz press. Not meant to inflame or cause problems. I certainly respect your opinions and your work. Thanks Jon
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Old 09-11-2018, 01:09 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by Jon Thompson View Post
In the process of Blow Forming (Thermo Forming) is the hot gas used to displace atmosphere to prevent penetration in to the material when in a plastic state? I provided the link to Kirkham as a reference to the connection I had made to the Artz press. Not meant to inflame or cause problems. I certainly respect your opinions and your work. Thanks Jon

Hi Jon,
Using hot gas on hot sheet (plastics like Lexan or Lucite, and some aluminum) cause shapes to be formed, like blowing bubbles or blowing glass.


I was just making observations on the Kirkham film.
Kirkham uses the stretch press in different ways.
Sheet shaping is like skinning catfish - lots of ways available.
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