Anyone had a kitchen scale that works at sea?

What you need is a fluid damped scales.

You can get fluid damped load cells or you could immerse a spring scale in a can of oil to reduce any forces due to Mr Newton's equations
 
Sandy said:
What happens when your computer, or whatever device you use, gets all bunged up with two part epoxy?
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Lost me there. Why use a computer to weigh a few grams of epoxy? How?? 🤔

If it's the mix ratio then it can be a bit complex & needs some extra technology before putting on the marigolds . Usually known as a "pen" or "pencil" & piece of paper.... 😊

Set of digital scales can be had for under a tenner down the supermarket. And a ziplok bag to put them in. Thrown out one set of cheap scales so far over the years.

Not opinion, this is just a system that works here that has evolved over the many years in boatyards & anchorages far and wide.

Others will no doubt develop what works for them.

Not sure I've ever use a set of scales to cook with.. 😂
 
I think a pair of pan balances are the answer. Gravity works on both pans, and total mass is below the single point of suspension.
4Ekxnjq.jpg
 
If you made your own balance scale a bit like sarabande pictured you could move the attachment pivot point or end attachment to get the weight ratio you need. A bit of calculation or experiment needed. ie the length of the moment arms ratio will equal the ratio of weights when balanced. Then if you can suspend identical cups for resin and hardener the ratio will always be the same. The difficulty would be getting all of the hardener out into the resin pot. Or emptying all of both parts into a mixing pot. Ok if both parts have similar viscosity.
I imagine the problem of kitchen electronic scales is that they have 4 load cells to cater for the area of plate thus while they should average out this does not work so well in a moving environment. ol'will
 
William_H said:
If you made your own balance scale a bit like sarabande pictured you could move the attachment pivot point or end attachment to get the weight ratio you need. A bit of calculation or experiment needed. ie the length of the moment arms ratio will equal the ratio of weights when balanced. Then if you can suspend identical cups for resin and hardener the ratio will always be the same. The difficulty would be getting all of the hardener out into the resin pot. Or emptying all of both parts into a mixing pot. Ok if both parts have similar viscosity.
I imagine the problem of kitchen electronic scales is that they have 4 load cells to cater for the area of plate thus while they should average out this does not work so well in a moving environment. ol'will
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Digital scales have just one load cell, quite amazingly accurate. Arduino's/ESP32's can read the data with a little board off ebay. For a few days testing I knew the weight of all Euro coins to under a gram 😊
Feels like software timing out when they don't get a static reading for more than a moment. suspended tray on bungie might work, never been so much of a problem to bother trying.
Doubt if mechanical scales could get down to gram accuracy somehow, but never tried it. Might have to now 😂
 
Sandy said:
I saw a link between the two highlighted words.

No worries, it gave me a chuckle ;)
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TBH there's a handful of mix by weight spreadsheets stashed to a hard disk / google for various epoxy depending what's around , a few mix options usually get scribbled on the bench if in a boatyard with the always to hand paint pen. Someone said "just work it out in your head!". If only my 0.219298 times table was that good 😊
 
I do tend to weigh things that many people probably would not but for things I weigh at home I would determine the volume equivalent .

.
 
TBH - I have never weighed / measured any mix of resins / paints ..... eyeballed.

When it comes to food ingredients - I may weigh one or two of the strong flavour or 'sensitive' additions - but generally once I've done it - each time after is Mk 1 eyeball - especially that I am nearly always altering the 'recipe' to suit.
 
Usually says on the tin what weight is in it......

I have considered baking bread. I do it at home with premarked containers and experience (no scales).
 
sarabande said:
I think a pair of pan balances are the answer. Gravity works on both pans, and total mass is below the single point of suspension.
4Ekxnjq.jpg
Click to expand...

That would be way too crazy. Imnagine all the weights and what have you :p

But I wonder if not a hanging "fish scale" with a hook would work ok. Could hang a small bucket or something from the hook :)
 
It's simple. Measure waterline. Offload item to be weighed into dinghy. Re-measure waterline. Use boat's lines to calculate
change in displacement = item weight.
 
The problem with all these solutions is that they are trying to measure weight, i.e. the force an object exerts due to gravity. But on a variably moving platform this becomes difficult. What you need is a device to measure mass. NASA can help here as they have a similar problem in space, they use a device called Space Linear Acceleration Mass Measurement Device (SLAMMD). Hope I have been of help.
 
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