Gigantic ACME bolt - video

Gigantic ACME bolt. By Vanover Machine & Repair. 55:24 video:

https://www.youtube.com/watch?v=e7PkVWitlZw

Gigantic?
Hardly
Attachment 50289

Cutting the feed screw used in a machine, which rifled 240 mm
howitzer barrels, at the Niles Tool Works during WWII.
The screw is 6 inches in diameter and 62 feet long.
Quadruple threads 1-1/8 inch pitch, 4 1/2 inch lead,
being cut to an accuracy of .002 of an inch per foot of length.
Screw weighs 5,000 pounds.

Now that is big...

Quote:

---

Originally Posted by Isambard

Gigantic?
Hardly

Cutting the feed screw used in a machine, which rifled 240 mm
howitzer barrels, at the Niles Tool Works during WWII.
The screw is 6 inches in diameter and 62 feet long.
Quadruple threads 1-1/8 inch pitch, 4 1/2 inch lead,
being cut to an accuracy of .002 of an inch per foot of length.
Screw weighs 5,000 pounds.

Now that is big...

---

Isambard, You win!