Spring Balances

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bigmack
Posts: 348
Joined: 15 Dec 2015, 10:49
Name: Richard
Job Title: Lab Assistant
State/Location: NSW

Spring Balances

Post by bigmack » 21 Jun 2019, 09:25

Hi all
about to purchase some new spring balances .
Quite a few of the older ones have the numbers so badly worn off them that they are now useless.
several of the yellow ones have had the spring come detached and I am sick of trying to fix them .

They are available from the usual suppliers but when you zoom in on the pictures of them at first glance they all look the same but it becomes apparent that they are all slightly different . Also most are around $10 each while serrata has them for $6

So has anyone got comments on which are lasting longer ? and from where . I'm tempted by Serrata's cheap ones but usually that bites me on the backside.

Prima
Posts: 88
Joined: 02 Dec 2014, 11:20
Job Title: Lab assistant
State/Location: NSW

Re: Spring Balances

Post by Prima » 21 Jun 2019, 12:18

I've recently bought a new Premium style, much better and stronger than the old style. From Haines, code P350. Not cheap at $16 but hopefully an investment. We are keeping them for Seniors and letting the juniors use the old tubular ones. Until recently we were using the even older version, essentially just a spring attached to a copper plate with graduated marks down the side, absolutely useless!

bigmack
Posts: 348
Joined: 15 Dec 2015, 10:49
Name: Richard
Job Title: Lab Assistant
State/Location: NSW

Re: Spring Balances

Post by bigmack » 21 Jun 2019, 12:40

Thanks Prima . They look nice . biggest issue I had with the old tubular ones was the markings wearing off . how well do they appear printed or etched on the Haines ones ?

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Labbie
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Name: Sue Rowley
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Re: Spring Balances

Post by Labbie » 21 Jun 2019, 13:34

Do try clear nail polish, stayed on for years. over the markings of course. We also did this on the glass Measuring cylinders.
Regards Labbie

Lab Manager/Lab Tech, mind reading etc etc
Now retired :wub:

Prima
Posts: 88
Joined: 02 Dec 2014, 11:20
Job Title: Lab assistant
State/Location: NSW

Re: Spring Balances

Post by Prima » 24 Jun 2019, 11:05

Great idea, Labbie!
Might not be necessary with this new design, the markings are printed on the inside of the tubing, doesn't look like they can be worn away by the sliding marker.

Merilyn1
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Re: Spring Balances

Post by Merilyn1 » 24 Jun 2019, 11:56

Prima wrote:
21 Jun 2019, 12:18
I've recently bought a new Premium style, much better and stronger than the old style. From Haines, code P350. Not cheap at $16 but hopefully an investment. We are keeping them for Seniors and letting the juniors use the old tubular ones. Until recently we were using the even older version, essentially just a spring attached to a copper plate with graduated marks down the side, absolutely useless!
Wow, they do look good. Maybe keep us posted on how they perform over the next 12 months. Shame I just bought some of the cheaper ones (still cost $12) so probably won't need to buy any for a while (hopefully!).

bigmack
Posts: 348
Joined: 15 Dec 2015, 10:49
Name: Richard
Job Title: Lab Assistant
State/Location: NSW

Re: Spring Balances

Post by bigmack » 24 Jun 2019, 14:58

Prima wrote:
24 Jun 2019, 11:05
Great idea, Labbie!
Might not be necessary with this new design, the markings are printed on the inside of the tubing, doesn't look like they can be worn away by the sliding marker.
Sure is a great idea Labby . I might try to save the existing ones this way .

Thanks for the info Prima , that sounds excellent \:D/ ....head teacher said spend the extra .
Now just got work out exactly which sizes to get .
We used to have 0-1N , 0-5N and 0-50 but it Seems the old yellow 0-50N were rarely used so thinking might go 0-20N instead .

bigmack
Posts: 348
Joined: 15 Dec 2015, 10:49
Name: Richard
Job Title: Lab Assistant
State/Location: NSW

Re: Spring Balances

Post by bigmack » 03 Jul 2019, 12:22

OK they arrived . Pretty happy with them . They were all "Zeroe'd" on arrival . I checked all the 1N ones with a 100gm mass and they all weighed 100gm except for one that was 0.5gm out .....I'm pretty happy with that . :grin:
Haines Spring Balances.jpg
Here's a side by side with the older type we had . The scale is longer on the new ones and easier to read I think . Also as Prima said , the markings are on the inside so shouldn't wear off .
Spring Balance Compare.jpg
My only concern is that the wire that comes out could be damaged by rough students . The 100gm mass was not an issue but imagine doing this with a 2kG weight . Time will tell .
Possible failure point.jpg
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