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Fly press weights.

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David Jupp22/01/2020 12:59:07
738 forum posts
17 photos
Posted by Paul Lousick on 22/01/2020 11:58:02:

. The smaller the parts, the better because you can pack in a higer proportion of steel.

Not quite the full picture. As long as the parts are 'small' relative to the mould, filler part size doesn't make any difference. It is actually the distribution of sizes that affects the packing density (smaller parts can fit in gaps between larger).

If you don't believe this, consider using 1/4" ball bearings or cannon balls. The packing density will be the same if just one size is used (the scale changes but the proportion of empty space remains the same). If you use BOTH, then the ball bearings can fill much of the space between cannon balls. The packing density would go up again if you also used steel powder with spherical particles (would fill gaps between ball bearings).

not done it yet22/01/2020 13:05:46
4905 forum posts
20 photos

Suppose it might be helpful if we knew the size of balls required? More than 100mm?

Harry Wilkes22/01/2020 14:37:05
968 forum posts
63 photos

Charity shops can be a good source for weight lifting weights and dont cost arm & leg


Rob McSweeney22/01/2020 14:40:29
4 forum posts

Have you seen this? :-

Shot Putt balls seem to sell for a bit less than cannon balls, and appear to have been machined to final weight , which is encouraging.

larry phelan 122/01/2020 15:12:04
806 forum posts
14 photos


Sad to say, Cromwell found better use for his cannonballs around here !and then he brought them home to use them somewhere else [waste not want not ]

I forgot to mention that the press is a number 5, so I think the weights would be somewhat bigger than 100mm.

Still have plenty of ideas from the response.

not done it yet22/01/2020 16:53:29
4905 forum posts
20 photos

30 years ago, I would simply have picked up the phone and arranged for a ‘sample’ from:


Rep would have picked one/them up and brought it/them back from Liege on his next trip.🙂

Any size (within reason for a company car), any material and any hardness.

They are still going, but contact lost of course.

Also used very large balls in vertical grinding mills. Up to about 400mm, maybe more. Babcock & Wilcox supplied the coal mill, as I recall.... but they were only about 225-250mm diameter IIRC.

Now, what size were you wanting?🙂

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