youdontknowme Also, how would Barbie dolls be "kept chaste"? Without genitalia, it is not like there is any unchaste behavior that could be prevented?
I believe this is called "defense in depth" 
Tollyboy odd jobs
The whole idea to design a belt without hinges sounds nearly impossible, unless you make it where it snaps together, making it impossible to remove afterwards. Plus, you'd have to consider that adjustments would need to be made in the future between shaping and wearing in various positions. The long-term concern is the weight management of the person, where if they expect to keep this idea plausible, they'd have to live on a strict lifestyle.
youdontknowme Love the twist at the end. I assume the "lock" is more of a closure with removable, key-shaped actuator? I doubt you can scale a secure lock down to Barbie size.
Yes it was but now you have me thinking, I get into more trouble that way. The pins in a standard lock are 0.080 inches diameter (American locks) and the longest of them is 0.195 inches long. The waist of a Mattel Barbie is 3.75 inches so about 1/10 of the average adult female. Therefore lock pins would be 0.008" and max 0.020" long, the springs would be about the same. The body of the lock (not the lock block) would be 0.075". So in European measurements, it would depend on my ability to make pins 0.2mm in diameter and less than 0.5mm in length. Too small for my current machinery but reasonably large by the standards of Swiss watchmaking. Maybe I can find a kinky watchmaker to help me one day.
youdontknowme Also, how would Barbie dolls be "kept chaste"? Without genitalia
I noticed she appeared to be tightly infibulated when I was measuring her.
Raziel The whole idea to design a belt without hinges sounds nearly impossible, unless you make it where it snaps together, making it impossible to remove afterwards.
Steel is bendy, especially in reasonably thin bands. Making such bands in the size of the wearer in question is a different challenge.
Taz The waist of a Mattel Barbie is 3.75 inches so about 1/10 of the average adult female.
Was surprised about that, especially considering Barbie's figure, but it works out realatively well. Volume does scale with the cube of linear dimensions after all.
Taz Too small for my current machinery but reasonably large by the standards of Swiss watchmaking. Maybe I can find a kinky watchmaker to help me one day.
I am not sure proportional scaling addresses all structural concerns, like rigidity, tolerances and lubrication. However, the square-cube law might be in your favor in some of those regards.
Angelina this idea alone seems very utopian to me, the belt would weigh more than i would myself
Yes, the customer may be perfectly sane in the rest of life but when it comes to chastity any sense of reality is just gone. Even back then there were enough online calculators that they could have checked metal density and calculated an approximate mass for the belt. They could just have looked at the padlock they bought and thought this weighs 5kg and the belt will be several times heavier than that. They could even have just put on 6 or 8 adult nappies to simulate the bulk of it to see if they could hide it under clothes. But did they, no.
Raziel
I have read about metal with memory effect. After it is bent and retains its shape, you heat it and it goes back to its old shape. It is apparently used as a replacement for discs. So the temperature can't be that high.
The hip band would be shaped to fit the hip, bent open, put on, heated and it would bend back.
Vanessa I wonder how he knew about chastity belts without knowing what he wanted was impossible...
this is not surprising, my father would prefer my belt to be closed at the back (even though i am not interested in anal sex), but he also wants me to be able to go to the toilet without problems.... sometimes it is difficult to combine different interests
Taz it was to be locked with some some huge industrial padlock that they brought with them probably weighing about 5kg
Going back to the first story, I imagine this sort of like a cartoon chastity belt with the oversized padlock loosely dangling from the front. Thigh bands would be a mandatory accessory for that; if the wearer started running, the knocking might injure her otherwise.
Angelina Latowski offers an anal cover plate that can be locked onto the belt without removing it using a little cam lock. Which would allow it to be used for short periods where there is an elevated danger of the rear opening being abused, or for making the belt a street-legal, if extravagant piece of clothing.
There is also a version of that cover that includes a little rod you can attach various items to, but those items generally do not promote being chaste.
yes, i know these cover plates, but that would not solve my father's "problem" (i don't see it as a problem 
) because when the plate is in place, only he could open it, bad if i am in the public
Angelina because when the plate is in place, only he could open it, bad if i am in the public
It could be keyed to use different keys than the belt. Looks like the belt uses single-sided pin-tumbler locks while the cover uses a two-sided wafer lock, so it is very unlikely one key would work for both. Which makes the butt cover no security downgrade, but giving the wearer the key of course limits its usefulness as a security upgrade as well.
Eliminating what is commonly referred to as the "poophole loophole" (see also: Garfunkel and Oates - The Loophole) without significantly impeding unsupervised long-term wear is perhaps one of the more difficult engineering problems in chastity belt design, and (to get back to topic) I am sure Mr. Tollyboy has some interesting stories about overconfident clients who believe that problem to be solved.
Today I woke up to a message asking if I could build a 42mm diameter permanent anal plug as part of a full metal torso harness. At least the customer can afford to pay for this item, has extensive experience of long-term effects, and is sane enough to know it would need a removable inner plug with a tapered top to make it possible to insert. As for a full torso cage made of barstock I assume they are looking at something like a woman's one piece swimsuit in general outline built out of a spiderweb effect of small round bar and somehow integrated with a chastity belt. I will await more details of the job with interest.
youdontknowme I am sure Mr. Tollyboy has some interesting stories about overconfident clients who believe that problem to be solved.
Yes, there are many who think this is not a problem. Take a two-inch medium wall thickness tube cut a thread on the inside to screw in a bung weld it to the back of the belt and call it good. Apart from the problems of how would you insert it with no tapered guide on the top to ease it into place, how are you going to deal with a permanently overstretched anal sphincter, why put threads on the inside of it where they will be harder to clean. etc. Anyone wanting to go this route needs to consider the possibility of permanent anal incontinence so even if you get over this fetish you might well be wearing adult nappies for the rest of your life or may need surgery to insert some form of an artificial sphincter. I have had lots who want this with no consideration of the consequences of it.
The only permanent anal plug that I have so far ever built and that I know works is made of half-inch bar and is turned much like a dumbbell. There is a half-inch ball on the end that is inserted the stem is small so causes effectively no stretching about 4mm as I remember and there is a ball on the other end that is drilled through and soldered to the rear cable of an FGA/200 belt. Round end to avoid cutting or tearing anything, very small shank to avoid stretching anything, not removable but not I imagine the cleanest thing to use. Would I think almost certainly need a bidet for washing?
The purpose is to be just big enough to serve as a reminder it is there and to prevent any attempt at moving the cable sidewards to perhaps allow some anal stimulation. I have no idea if it actually works but then I rarely get feedback.