I'm trying to make barbell loadable atlas stones that have accurate weights. Like, say, 50lbs, 100lbs, and 200lbs. It's hard to accurately calibrate the weight of atlas stones I would imagine as their weight goes down as the cement dries over time, but certainly it can be estimated vis-a-vis the volume. Anyway, that's the weeds, ideally I'd make a custom mold with 50mm diameter cylinder passing through the center, but what I have is a solid atlas stone, and I'm thinking I can bore a 50mm hole with a masonry bit I actually already have with my large drill press, but once the hole is drilled, how then can I calibrate the weight to be heavier or lighter to have precise standard weights in 50lbs, 100lbs, and 200lbs?

Just in case it's not clear what I'm describing:

enter image description here

  • What you've described reminds me of the "stone of steel", which you may find suitable for your purposes. I have no affiliation with that website/business/product. Feb 3, 2018 at 15:21
  • Just realized I'm constrained by a sleeve length of 44.5cm (17.5in), so the atlas stone will have to have a sphere diameter less than that to accommodate collars, so if I want heavier weights, I'm going to have to substitute the volume constraint with density. That is, since I can't have an atlas stone larger than my sleeve length, then if I want to have heavier weights I'll have to add heavier material in with the concrete... Anyway, I'm probably alone in my excitement. ^_^ Feb 3, 2018 at 21:52
  • @ChristianConti-Vock, is that loadable? I don't think it is. It's interesting, but it's also not a homogenous solid. Feb 4, 2018 at 0:47
  • The "stone of steel" is loadable with Olympic barbell plates. I'm sorry, though -- now that I see the image that you added, it's clear to me that I completely misunderstood what you want. I have no suggestions, but I wish you well. Feb 5, 2018 at 2:12
  • So you want to be able to put any of the stones on and hold it with a clamp?
    – Gimli
    Mar 5, 2018 at 6:02


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