Regarding deflection of volute springs - Tokaibane's Q&A page.

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Is the maximum amount of deflection of volute springs the [free length-board width]?
Also, what should be the percentage of the maximum deflection? I mean regarding the load characteristics of volute springs, what is the percentage of allowable deflection when the spring constant is constant? What is the spring constant at that time?

By the way, the specifications are as follows.
Material: SUP10 Hardness: HB380-400, Upper inner diameter: φ85mm, Lower outer diameter: φ260mm, Free length: 330 ± 4mm, Total number of coils: 5, Number of active coils: 3.5, Plate thickness: 18mm, Plate width: 180mm

Thank you in advance for your reply.

*SUP10（EQ to by ASTM, 50CrV4 by DIN, 51CrV4 by ISO)

Mr. Zhuge Liang, Thank you for writing! Regarding the dimensional specifications that you provided us with…

[Question 1] What is the percentage of allowable deflection when the spring constant is constant? [Answer] With the current dimensions, the total deflection is up to 60%. (Deflection amount: 89.7mm)

[Question 2] What is the spring constant at that time?
[Answer] Spring constant: .3N / mm. “

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Interesting article. Though i must admit i had never heard of a bustle rack, i’ve only known it as a turret basket. But still an interesting feature.

Bish, the turret basket is the floor the loader stands on. Also, having not read the artical, I wonder if the rails on the M48/ M60’s turrets are called infantry rails. That’s what we always called them.

The “bustle rack” and the “turret basket” are two different things. A bustle rack is named after an old fashioned lady’s bustle skirt which is a wire support that gave them a bigger butt under their dress. See the center model below.

The turret basket is the portion of the crew compartment that rotates with the turret. Previously on older tanks, the turret was separate and the crew had to “walk” with the turret as it rotated. A basket was added under the turret and the crew could now be seated and rotate with the turret. The turret floor is the bottom of the turret basket. The area under the turret floor is called the sub-turret floor. A black hole where hand tools vanish.

This is a turret basket, a basket hanging under the turret.

Bustle rhymes with hustle.

Bogies sound like the actor’s name.

The rails on M48, M60 and M1 tanks are called “grunt rails” even though infantymen no longer are able to hang onto them (as on the Abrams tank). Grunt rails are on the side and the bustle rack is on the rear, although today, they rails basically continue around the back to become the bustle rack on an Abrams.