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Author Topic: Plugging  (Read 4334 times)

Moon57

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Plugging
« on: November 11, 2007, 02:21:17 AM »
Talking about saving plugging material, I use a digital scale for determining how much resin to mix with how much hardner. Scale measures to .05 of an ounce. Set the mixing cup on the scale, turn it on, let it zero out, pour the resin, pour the hardner. If you pour real slow you can get exactly the right amount of each. I just mixed up a batch. 2.2 oz of resin, 1.1 of hardner, total 3.3 oz. Did 2 thumbholes, 1 with cubes 1 without. Had enough left over to make 6 cubes. I just wish I had thought of this alot sooner instead of trying to use the lines on the mixing cups.

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Moon
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So many questions, so little time but I'm having fun.
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JONES_E828

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Re: Plugging
« Reply #1 on: November 11, 2007, 10:30:31 AM »
what kind of plug are you using?  all of the plug i've ever used was either 3:1, or 1:1 ratio.
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Moon57

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Re: Plugging
« Reply #2 on: November 11, 2007, 11:25:51 AM »
Lane Concepts premium 1 hr plug. 2 to 1 ratio. I get it at Innovative Bowling.
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Moon
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So many questions, so little time but I'm having fun.
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JohnP

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Re: Plugging
« Reply #3 on: November 12, 2007, 10:26:59 AM »
This will work as long as the density of the resin and of the hardener are the same.  --  JohnP
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Moon57

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Re: Plugging
« Reply #4 on: November 12, 2007, 12:20:25 PM »
Good point John and one I hadn't thought of. I looked on the resin and hardner containers and they both say 32 fl oz. The bottles appear to be the same size. One thing I've noticed since mixing this way is more uniformity in the hardening process. BTW what is the definition of a fluid oz. Enough fluid to weigh an ounce? Seems simple enough but sometimes things are not what they appear to be.
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Moon
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So many questions, so little time but I'm having fun.
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Strapper_Squared

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Re: Plugging
« Reply #5 on: November 12, 2007, 12:32:19 PM »
No.  A fluid ounce is used to distinguish it from the other ounce (weight).  The only relation between the two is the name.  It is possible that they would be equal, but only for a fluid of a specific density.

Plug material is mixed using volumetric ratios.  3:1 meaning 3 parts (table spoons, fluid ounces, cups, etc) to one part.  I very highly doubt that plug material (both resin and hardener) has a density of 1 (meaning you could use 3:1 ratio of weights).  However, it would be very easy to calculate the densities (especially since you have a scale).  Pour out a known volume of material (say 10 mL) and weigh it.  That gives you weight/volume ratio (or density).  Repeat for the other part of the plug material.  Once done, you can calculate the weight of each part required to stay within the 3:1 (or 1:1) volume ratio of materials.

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Edited on 11/12/2007 1:33 PM
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shelley

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Re: Plugging
« Reply #6 on: November 12, 2007, 12:40:18 PM »
A fluid ounce is very roughly the volume that one ounce of water (by weight) at X temperature would occupy.  Depending on whether you use Imperial units or US units, the actual volume of a fluid ounce can change, though not by much.  For most purposes, it doesn't matter, a fluid ounce is a fluid ounce, but I can see how the confusion for ball plug could make a difference between the cured plug being too hard or soft.

Really, though, so long as you use the right ratios, it doesn't matter if you measure in US fluid ounces, Imperial fluid ounces, mL, or hogsheads.

SH

Edited on 11/12/2007 1:41 PM
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qstick777

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Re: Plugging
« Reply #7 on: November 12, 2007, 01:48:18 PM »
Just follow the instructions for the ratio.  Most of the plastic/urethane mixtures will tell you if the ratio is by volume or weight.

My fast plug is 1:1 by volume - 1 oz medicine cup of A to 1 oz medicine cup of B.

The RTV silicone I have is 10:1 by weight.  First time I used it I assumed it was 10:1 by volume......that stuff never did "set" properly!


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Moon57

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Re: Plugging
« Reply #8 on: November 12, 2007, 02:17:55 PM »
I weighed a bottle of unused resin and unused hardner. Resin weighed 39.4 oz, hardner weighed 34.4 oz. Don't know how much an empty bottle weighs, threw all the old ones out. Dividing 39.4 by 34.4 = 1.145. Assuming,since I'm not going to dump the bottles to check, the volume in both bottles is the same and not worrying about the weight of the bottles, for every 2.29 oz of resin I need 1 oz of hardner(oops,been spelling hardener wrong). Interesting point you brought up John. One worth noting for future reference. One thing for sure though, I'll never go back to using the lines on the mixing cup.
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Moon
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So many questions, so little time but I'm having fun.
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Moon57

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Re: Plugging
« Reply #9 on: November 12, 2007, 02:22:13 PM »
qstik, My bottles of resin and hardener just read "mix 2 parts resin to 1 part hardener". I assume they mean by volume since that's how most people do it.
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Moon
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So many questions, so little time but I'm having fun.
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JohnP

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Re: Plugging
« Reply #10 on: November 12, 2007, 09:12:49 PM »
As far as I know, all bowling ball plug materials are mixed by volume.  And there is some room for variation in the desired mix ratio before the quality of the plug is affected.  As long as the densities of the two liquids are close to the same (they don't have to be 1.0, just close to the same) the weighing method will work OK.  The proof is in the pudding.  As long as Moon57 is satisfied with the quality of the plug by weighing, I wouldn't change anything.  Just remember, if you change the brand of plug the weighing method may not work with the new brand.  --  JohnP
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