Basic Measuring & Weighing
#16
Posted 16 November 2005 - 08:00 PM
After a bit of thinking I belive the main problem I am having with the cheap scale is it's out of calibration, so to Sizzle I belive thats my main problem with it.
So far I love the Ohaus, JE500
#17
Posted 16 November 2005 - 08:29 PM
#18
Posted 16 November 2005 - 09:59 PM
yep, 14.2g is about 1.5% off, nothing bad at all.Well, on measuring a ?2 coin it displays 14.2g, so if fishy1's information is right then they are pretty much accurate.
you could try it with two ?2 coins, and so if you get about 28g you know they're consistent. if however, you get 35g or something like that, it's not good.
#19
Posted 21 February 2006 - 02:53 PM
For example, When you see this formula
10:15:75/S:C:KNO3
This means that the parts are as following:
10% is for S (Sulfer or Sulpher)
15% is for C (Carbon or Charcoal)
75% is for KNO3 (Potassium Nitrate)
_____________________________________
Another thing, What about the + Sing ?
If you see for example this formula :
10:15:75/S:C:KNO3 +10%Dx
Then you have the following:
10% Sulfer
15% Coal
75% KNO3
And in addition of 10% of Dextrin
Thus, You will get a total of 110 not 100.
Hope this helps.
Edited by BlackSky, 21 February 2006 - 03:54 PM.
#20
Posted 21 February 2006 - 03:18 PM
I may return to the beginning of the post. I'd like to add some clearification for those who are new in the field.
For example, When you see this formula
10:15:75/S:C:KNO3
This means that the parts are as following:
10% is for C (Carbon or Charcoal)
15% is for S (Sulfer or Sulpher)
75% is for KNO3 (Potassium Nitrate)
Another thing, What about the + Sing ?
If you see for example this formula :
10:15:75/S:C:KNO3 +10%Dx
Then you have the following:
10% Sulfer
15% Coal
75% KNO3
And in addition of 10% of Dextrin
Thus, You will get a total of 110 not 100.
Hope this helps.
It should be done in parts as the second one adds to more than 100. Also the first formula is wrong:
Sulpur and charcoal are the wrong way round.
#21
Posted 21 February 2006 - 03:55 PM
Edited by BlackSky, 21 February 2006 - 03:56 PM.
#22
Posted 21 February 2006 - 09:01 PM
heres a link to the scales I have- great product!
http://ukscales.com/...&products_id=80
Edited by Damp Squib, 21 February 2006 - 09:02 PM.
#23
Posted 08 September 2006 - 04:25 PM
For pyro use, I bought some digital jewellery scales on eBay recently, described as accurate to 0.01g. Seller was olympiceyewear. Scales manufactured by Neva. The total inc. delivery came to just ?11.90.
They are very accurate.
They measure up to 50g (although the "up to 100g" version only costs a few quid more).
They come with a calibration weight.
I have just seen this thread and it gave me some better ideas on how to test it than what I already had. So I just went and tested it again.
To test it I measured a Duracell battery: 24.32g
And a metal bolt which weighed 21.02g
Adding that up, it comes to 45.34g
When I measured both on the scales at the same time, the reading was 45.35g - so that's definitely an acceptable margin of error! The +0.01 discrepancy could even have been caused by the sweat on my hands... I was sweating quite badly... who knows.
I also took an LED and measured its weight 3 times, turning the scale off and on inbetween each measurement... each time it came out as measuring the same.
And when measuring the calibration weight, which is 50.00g, it comes out as being 50.00g.
So I am very happy with these 'cheap' digital scales. They have turned out to be very accurate and a very good investment. Definitely would recommend getting a pair off eBay, ok, there is a small risk that you'll get a duff pair, but if you get a good pair you'll love them I think.
Edited by pendulum, 08 September 2006 - 04:30 PM.
#24
Posted 08 September 2006 - 05:12 PM
I bought the DS-500 500g/0.1g balance last week from ukscales.com for only ?9.99 + VAT + P&P, about ?15 in total. It arrived within 2 days and works just fine. It always reads spot on 100.0g with one cal weight, 200.0g with two and spot on with a new ?2 coin, good enough for me.
More importantly, it will let me accurately lift 4" ball shells and big 3" cans
A quick note though that the scales are easily damaged by overload and ingress of oxidisers etc. My previous Satrue 250g/0.1g from Maplin only lasted a year, suffering both of these abuses.
Edited by BrightStar, 30 March 2009 - 09:48 PM.
#25
Posted 18 October 2006 - 08:05 PM
Amazingly, this does 250g in 0.0001g (0.1 mg) increments! That's a precision 1/2,500,000 of its full scale deflection.
The thing reads out to a computer graph plotter in real time and is so sensitive you can watch minute changes to samples in real time. It would be fascinating to put some damp stars in to see how they dry (no chance BTW!)
Still, just so you know.... yours for only GPB ?4000 (about USD $7500)
and I was so happy with my +/- 0.1g...
Edited by BrightStar, 30 March 2009 - 09:49 PM.
#26
Posted 30 January 2007 - 10:43 AM
It's battery operated, 0-500g capacity, +/- .1g accuracy.
It weighs in grams, ounces, penny weight and has "tare" and counting functions.
See more at: http://www.harborfreight.com/
Drawbacks are a small platform (6 X 8.5cm) and non chemical resistance to acetone-type solvents.
#27
Posted 10 July 2007 - 05:15 PM
#28
Posted 10 July 2007 - 05:29 PM
Edited by marble, 10 July 2007 - 05:30 PM.
#29
Posted 10 July 2007 - 06:51 PM
It has served me well until I recently is building a 3" that I need to weight out and so far (still need loads of pasting) it weights much more than 100 g (it's a guess, all I get on the display is "EEEEE")
Keten sells a 2000g +/- .1g for 170 zl (61$) !!!
That's unbelievable cheap, however I am a bit suspecious.
Either it's the quality or else it's just that scales in Poland are cheaply mass produced
#30
Posted 10 July 2007 - 07:10 PM
would they ever turn up? you could always email himRight now I have a 100g +/- .1g scale that I got from my grandfather.
It has served me well until I recently is building a 3" that I need to weight out and so far (still need loads of pasting) it weights much more than 100 g (it's a guess, all I get on the display is "EEEEE")
Keten sells a 2000g +/- .1g for 170 zl (61$) !!!
That's unbelievable cheap, however I am a bit suspecious.
Either it's the quality or else it's just that scales in Poland are cheaply mass produced
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