Gigantic ACME bolt - video

**Jon** · Jan 19, 2026, 04:59 PM

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

**Isambard** · Jan 20, 2026, 07:44 PM

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...

**Hoosiersmoker** · Jan 22, 2026, 07:20 AM

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!