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Fly press weights.

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larry phelan 121/01/2020 09:47:33
806 forum posts
14 photos

Good morning all,

Having now got my flypress set up on its new bench, I am looking for ideas about how to make weights for it. Suitable lumps of cast iron are somewhat thin on the ground around here. Even the local scrapyard has nothing much to offer [scrapyards are not what they used to be ]

Any ideas ? I,m sure some of you have been there, done that.

Thanks in advance for any ideas.

RichardN21/01/2020 09:54:16
116 forum posts
9 photos

Large bean can full of lead on each arm... I've seen that in many workshops.

Paul Lousick21/01/2020 09:55:19
1503 forum posts
572 photos

Dumbbell exercise weights are a source of cast iron discs.


Edited By Paul Lousick on 21/01/2020 09:56:48

David George 121/01/2020 10:01:31
1304 forum posts
447 photos

Have some cast. Make a wooden or plastic model, two halves of a sphere. And a core mould for the hole to match the top of the handle. You could sell spares.


noel shelley21/01/2020 11:35:08
116 forum posts

It would not be rocket science to cast them on the stubs in lead. They would then fit well. Use a ball as a pattern to make a split mold in plaster of paris. set up on stub, seal bottom with clay or plaster, hole in top. Pour in lead. leave for 30mins open, repeat on other stub if needed. Simples ! Noel.

noel shelley21/01/2020 11:36:15
116 forum posts

If You need more details PM me.

not done it yet21/01/2020 12:41:22
4905 forum posts
20 photos

Cement works local? They will use large cast balls. Generally, up to about 100mm.

Jeff Dayman21/01/2020 12:44:02
1855 forum posts
45 photos

Surely some sawcut and drilled steel cylindrical shapes would function just the same as spheres on a flypress? Much cheaper and easier to obtain than custom spherical castings I expect. All edges chamfered for safety of course.

If they need to be hollow / lead filled, they could be fabbed from steel tube and a steel disk welded together then lead cast in.

Baz21/01/2020 14:01:54
454 forum posts

Couple of old cannonballs, drilled and filed to fit?

BOB BLACKSHAW21/01/2020 14:28:17
314 forum posts
68 photos

If you need any advice on tooling and how the press can be used for fine limit work. PM me.


old mart21/01/2020 15:20:52
1923 forum posts
151 photos

As already mentioned, exercise weights would be useful, and there are a lot of unwanted ones about. Whatever weight you use, make sure it is secure on the press, as they can fly off, I have witnessed it happen.

Buffer21/01/2020 15:35:33
165 forum posts
46 photos

Float from a toilet valve in sand then pour in molten lead.

Bandersnatch22/01/2020 01:37:53
1716 forum posts
60 photos
Posted by Paul Lousick on 21/01/2020 09:55:19:

Dumbbell exercise weights are a source of cast iron discs.

... as long as you don't need to machine them too much. I tried these for a model-engine flywheel once - the skin went all the way through. Quality they are not (nor need to be in their intended use).

Paul Lousick22/01/2020 04:26:01
1503 forum posts
572 photos

Exercise weights are made from similar cheap cast iron as used in sash window weights. Sometimes it is OK to machine but Murphys Law says that most of the time it is crap. But they are cheap and good if used in the right application. Car brake discs are better souce of machinable cast iron if it is a suitable size to suit the application.


bricky22/01/2020 07:31:59
440 forum posts
48 photos

Lead as suggested in a mould ,if plaster of paris is not availiable use scimming plaster from a building merchants.


Bazyle22/01/2020 09:41:46
5398 forum posts
206 photos

Modern exercise weights are concrete with a plastic sheath. If the mounting is a spike like mine or just a rod you can make a mould of that out of plasticine, cast a soft plaster 'spike', cast a concrete block around that and dig out the plaster. No point in using anything more expensive than concrete as size is not an issue.

AJW22/01/2020 10:46:38
305 forum posts
121 photos

On my flypress I used an old 3 jaw chuck nipped up on the stub, worked well enough!


Paul Lousick22/01/2020 11:58:02
1503 forum posts
572 photos

One of the options given was to to use concrete but if you would like the weight to be heavier for its size, add lead or steel to the mix.

One of the companies which I worked for manufactured industrial cranes like the ones on building sites but much bigger and the cost of cast iron or steel for the counter weights was expensive. The weights were more than 20 tonnes each. They were made by casting concrete using steel as the aggregate. Mainly from the discarded pieces remaining after punching parts from steel plate. The smaller the parts, the better because you can pack in a higer proportion of steel. For the flypress weight you could use any small metal objects, nuts, bolts, lead fishing weights, etc. Use concrete, polyester resin, builders joint filler or other bonding agent to hold the casting together.. The mould coukd be simply a childs plastic ball.


Circlip22/01/2020 12:18:52
1180 forum posts

"Where have all the foundrys gone, Long time passing .........."

Pity you're not in China or India.

Regards Ian.

ega22/01/2020 12:46:27
1794 forum posts
153 photos
Posted by old mart on 21/01/2020 15:20:52:

As already mentioned, exercise weights would be useful, and there are a lot of unwanted ones about. Whatever weight you use, make sure it is secure on the press, as they can fly off, I have witnessed it happen.

I accepted a set from a friend with this in mind only to find that the outer plastic casing contained some brownish-coloured material that definitely wasn't CI.

Does anyone know what alternatives to CI are used fro this purpose?

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