Name of procedure or tool??

[Mike Summers]

So I am trying to describe the many different size holes I have seen in structures, bulk heads and brackets of race cars. I would describe them as "lightening" holes. Nice clean cut with the outer diameter slightly curved in. All over the Terry Hoops of Lotus and Lolas………...How do they do that?? Is there a tool kit?? Awake last night thinking about it !!!

Mike Summers

[BeerBudgetRacing]

Punch/Dimple die?

https://www.eastwood.com/eastwood-pu...ring-dies.html

[Ken Lawrence]

Look at Eastwood

https://www.eastwood.com/eastwood-di...le-flares.html

[BorkRacing]

I get good results using a hole saw and then one of these flange dies from Mittler Bros.
https://www.summitracing.com/parts/m...saAk17EALw_wcB

But the Eastwood ones look good if you can fit your piece into a press.

Robby

[BeerBudgetRacing]

But the Eastwood ones look good if you can fit your piece into a press.

The one I linked does not require a press.

[Mike Summers]

Thank you all, just ordered the Eastwood to give it a go...……………..will report back

Mike