Digital scale drift...what digi scale are you using?

Even with owing the CM that 120i with autotrickler is tempting.

$200 for trickler, $650US for 120i. Thanks goodness money grows on trees.
 
silverfoxdj said:
Not understanding this ????
Click to expand...
load cells?

May be the keypads or something?

Load Cell Durability

The load cells in our standard scale models incorporate strain gauge technology that measures weight via electrical resistance. As weight is applied to the scale, four matched load cells that are located at each corner of the scale pan experience very slight amount of bending, similar to how a diving board bends when someone stands on it. This distortion changes the resistance characteristics of the load cell, and the analog signal is sent from the Wheatstone bridge configuration. An AD converter then changes the analog signals to digital. Load cell durability comes from the stainless steel construction, the placement of the load cells, the mounting of the load cells in machined chambers, and the sealing of load cells with silicone.

Stainless steel load cells can take more abuse from forklifts or pallet jacks than those made of steel or aluminum. Some other large scale manufacturers use only one load cell in the center of the scale pan, and this allows lateral forces to distort weight results. The lateral forces also contribute to wearing out the load cell. By mounting the load cells in machined chambers, the frame of the scale protects them. This design also lowers the scale profile to less than three inches. The silicone seal prevents water from seeping into the load cells, which would damage the electrical components.

The load cells are designed to handle overloading and shocks that would damage other makes of scales. The scales are made to give unfaltering service for many years and in harsh conditions.
 
silverfoxdj said:
Not understanding this ????
Click to expand...

Load cells wear out with useage... or something else inside wears out.

They did give me a few years of good use and then started to go wonky. Replacement did the same.. I reload ALOT.

So I made the investment for the FX120i and the different style of load cell ... has worked reliably for several years now.

Jerry
 
Mystic Precision said:
Useage

Jerry
Click to expand...

I've reloaded at least 6000 rounds with mine (the Chinese version of the Gempro called HAD), and press the Tare button just about every time before I weigh something, and although it looks dusty and dirty, still has the same accuracy.

I've had many Varget particles slip underneath the tray, but can get them out by flipping the thing upside down and shaking it a little. Still works ok, and I always crosscheck a load from one scale to my other one anyway. I wouldn't trust it without comparing a load with its twin scale. I even crosscheck with my Lyman beam scale for gross errors, like loading 44.5G instead of 45.5G. Takes more time, but I didn't have to spend $700 on a fancy lab scale.
 
Fancy lab scale will weight 1 kernel of Varget (~3-5 in 0.1 grs). If you need to be 1 kernel accurate instead of .1 grain need fancy.
goggles said:
I've reloaded at least 6000 rounds with mine (the Chinese version of the Gempro called HAD), and press the Tare button just about every time before I weigh something, and although it looks dusty and dirty, still has the same accuracy.

I've had many Varget particles slip underneath the tray, but can get them out by flipping the thing upside down and shaking it a little. Still works ok, and I always crosscheck a load from one scale to my other one anyway. I wouldn't trust it without comparing a load with its twin scale. I even crosscheck with my Lyman beam scale for gross errors, like loading 44.5G instead of 45.5G. Takes more time, but I didn't have to spend $700 on a fancy lab scale.
Click to expand...
 
burnaby said:
Fancy lab scale will weight 1 kernel of Varget (~3-5 in 0.1 grs). If you need to be 1 kernel accurate instead of .1 grain need fancy.
Click to expand...

The Gempro has a tolerance of .02 grain, meaning that it will measure increments of 24.00, 24.02, 24.04 etc., or 1/50th of a grain, as opposed to the popular Hornady and Lyman type electronic scales that are accurate to .1 or 1/10th Grain. A Varget Kernel weighs between .02 and .03Gr. If I get a little obsessive, and I need a kernel that's a little lighter than .02, I look for one that seems shorter than the others and drop it in the dish with a pair of tweezers. But as was said before, 1 Varget kernel gives you a difference of 1.3 FPS, and represents less than 1/30th of an MOA, or less than one third of an inch in elevation at 900 Meters. My VBull is 10 inches in diameter.

Spending $700 for a scale that has a tolerance of better than .01 Grain, when each Varget kernel weighs .02 Grain: Not good bang for the buck, I'd say. But then, there's peace of mind that, if there's a screw up and you're getting bad groups or the odd flyer, for sure it won't be on account of your loads.
 
Last edited:
The advantage of a $700 scale is the way it works, not the display precision. A load cell-type scale is slower to respond and will drift more. You can get 0.02 grain readability but you won't be as confident as you would be with a magnetic force restoration scale. I know from my old Hornady Autocharge it would read to 0.1 but it was really only trustworthy for about 0.25 grains. It would smooth the internal display so much and avoid switching to the next interval, giving you the illusion that the weight is stable but in fact it is just covering up for drift which may or may not be real.
 
adamjmac said:
The advantage of a $700 scale is the way it works, not the display precision. A load cell-type scale is slower to respond and will drift more. You can get 0.02 grain readability but you won't be as confident as you would be with a magnetic force restoration scale. I know from my old Hornady Autocharge it would read to 0.1 but it was really only trustworthy for about 0.25 grains. It would smooth the internal display so much and avoid switching to the next interval, giving you the illusion that the weight is stable but in fact it is just covering up for drift which may or may not be real.
Click to expand...

The gempro does that a little. You add a kernel, then another, but the reading doesn't change. So I just tap the dish slightly to get it to measure again and now I see the change. But also, I crosscheck the load in my other sister scale. I guess the advantage of a $700 scale is its consistency and reliability, and you don't have to crosscheck all the time, so saving some time and increasing your throughput.
 
goggles said:
I've reloaded at least 6000 rounds with mine (the Chinese version of the Gempro called HAD), and press the Tare button just about every time before I weigh something, and although it looks dusty and dirty, still has the same accuracy.

I've had many Varget particles slip underneath the tray, but can get them out by flipping the thing upside down and shaking it a little. Still works ok, and I always crosscheck a load from one scale to my other one anyway. I wouldn't trust it without comparing a load with its twin scale. I even crosscheck with my Lyman beam scale for gross errors, like loading 44.5G instead of 45.5G. Takes more time, but I didn't have to spend $700 on a fancy lab scale.
Click to expand...

Where can you buy this Gempro copy? I'm assuming it's cheaper?
 
goggles said:
The gempro does that a little. You add a kernel, then another, but the reading doesn't change. So I just tap the dish slightly to get it to measure again and now I see the change. But also, I crosscheck the load in my other sister scale. I guess the advantage of a $700 scale is its consistency and reliability, and you don't have to crosscheck all the time, so saving some time and increasing your throughput.
Click to expand...

My GemPro 250 is similar. I either have to wait anywhere from 5-10 seconds for the last kernel to register, or (when I get impatient) just pull the scale pan off for a second and set it down again.

I find the rounding to 0.02gr annoying at times - especially when each kernel of Varget weighs about 0.02gr. I'll trickle a charge up to 24.58gr, throw one more kernel in and it jumps all the way to 24.62. If I then take one kernel out, it drops back down to 24.58gr...

After I dig around looking for a kernel that seems shorter/smaller, I can usually get it to settle on the magic number of 24.60gr
 
You must log in or register to reply here.
Back
Top Bottom