scales

big job

big job

Well-known member
I think this was a good deal. This ebay new scale comes with batterys and
a 110 volt power supply. Can be switched to metric / english. $15 bucks
and free shipping. I had it certified and is right on.
sam
 

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I have been looking at scales, and it seems the cheap ones are accurate to 1 gram, while the "good" ones are accurate to .1 gram. Which is this?
 
tubman said:
I have been looking at scales, and it seems the cheap ones are accurate to 1 gram, while the "good" ones are accurate to .1 gram. Which is this?
Click to expand...

The one above appears to be accurate to .1 oz. ( 2.8 gm.) to 30 lbs.
Something like this would be more accurate. And cheaper.
 

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Big Job, that is a neat little scale, I like it. They are both cool and both claim .1 oz accuracy.
 
I haven't done any major work requiring balancing. Just new brake cylinders, linings, fuel and gas lines......small stuff. Thanks for the tip tho.
 
Well, once again I have learned something new. I have always been lead to believe that you must take your rotating parts to a machinist to have the balancing done. I honestly never thought of scaling it myself on my own bench.
Well, now to go find me a good scale.
Thanks guys for yet some more great information!!!!
 
A scale can only check static weight of components, rotating assembles do have to be spun on a balance machine. Don't think we are talking about balancing an engine. But say you wanted to replace one piston in a factory type setup and wanted to select a piston that matched the other 7? That type of thing.
 
I got a set from Summit,they weigh down to .1 of a gram,haven't used them yet but they will be good for checking pistons etc.
Lawrie
 
Would it be possible to have your engine balanced cheaply by doing it partly yourself? I'm thinking about using a scale like one of these to properly weigh all of the reciprocating components and get a reasonable reciprocating weight for each piston assembly, and then having your crank balanced to match the goal reciprocating weight? Once the crank was back, you could "zero in" on the precise bob-weight needed for the crank balance with your scale and end up with a properly balanced assembly. Conversely, perhaps have the machine shop balance the crank and have them supply you the bob-weight used, and then select the pistons, rods, etc. to come close to that weight and then finish it out?

As an aside, I had a couple of friends a few years back who were into big block Mopars. They had a scale and when they did an engine, they would try to figure out what the original bob weight was (weighing new factory pistons and rods to come up with a base figure). They would then balance to that number, figuring the factory balance was close, and by matching the factory reciprocating weight, they could come close to a properly balanced engine. These guys had some fast cars and I don't remember them blowing too many engines. I am planning to do an "econo-rebuild" on an low mileage 8BA I have that sat inside in a wrecked car for 40 years before I got it, and has been in inside storage ever since. I think I am going to approach my balance job the same way the Mopar guys did.
 
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tubman>>>I am planning to do an "econo-rebuild" on an low mileage 8BA I have that sat inside in a wrecked car for 40 years before I got it, and has been in inside storage ever since. I think I am going to approach my balance job the same way the Mopar guys did. >>>

Sounds good to me!!!

Jack E/NJ
 
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