Wood Density / Specific Gravity - Mitch's World of Woods

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Күн бұрын

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@regthebackyardjackofalltrades 6 жыл бұрын

I’ve always worked with specific gravity on kerosene based fuels and standard day atmospheric temperatures. Even though I understood water on wood and read John Harrison’s book “Longitude,” I haven’t put much use in specific gravity on wood until this moment. I’ve worked on aircraft since high school but never used specific gravity at home until I ran out of heating oil fuel in my home while trying to save money on the heating oil market and a Nor’easter Storm come though and lost several inches which made a difference with the standpipe in my oil tank. That night my family and I used electric heaters, firewood and blankets until I was able to get four 50Gal plastic drums and fill up my tank with diesel full. A lesson learned when needed most. I changed to natural gas that Summer and now I live in Southern California and kerosene based fuels are only used for aircraft when I’m working with it. Thanks for this reminder. I’ll treat wood much differently now.

@mitchwoodwork 6 жыл бұрын

I guess this may our may not be worth knowing, depending on how anyone is using wood. For example, making a mallet or building a raft!

@regthebackyardjackofalltrades 6 жыл бұрын

I understood why Balsa Wood was used in making model aircraft instead of Oak but either I didn’t hear that part in class or the teacher had other subjects to teach since once out of high school I would be on jets. Now that I’m getting better and trying to learn to understand wood without too many power tools, I’m able to appreciate how our environment plays a role in everything we do or create. I’m definitely not in a rush to build and if I was getting paid to do this I wouldn’t care too much about specific gravity or barometric pressures, only to the point that the items would depreciate after 5+ years. That would be my bottom line in saving monies. But for my hobby, whatever I create will be built to last. “Building Rome in my Backyard...”

@ricos1497 7 жыл бұрын

I just made my first purchase from Surrey timbers this week, based on their involvement with your world of woods videos. Due to the snow, I haven't actually unwrapped the piece of Zebrano, however I can confirm it was an excellent and quick delivery and well priced piece. Thanks for putting me on to them, I'll hopefully use more in the future.

@mitchwoodwork 7 жыл бұрын

Rico S I hope you'll be happy when you unwrap it - do let me know. They aren't local to me, so I don't call in too often, but they've been very helpful in supplying samples for the series.

@tomaslainas695 7 жыл бұрын

hm :) need to get a block of greenheart for making yet an other carving mallet. i like the sinker woods :D i usually calculate density simply from measuring size, calculating volume and then putting the piece on a scale. if anything has a density of over 1 its suitable for mallet heads :D

@mitchwoodwork 7 жыл бұрын

Tomas Lainas Measuring and weighing is a great method, but not so interesting for video ;-) I have a small dense mallet on my to-do list!

@teddiie29l21 Ай бұрын

i have a few questions though to get me to understand it properly. - only the length of the samples that is important to get them at 100mm long and that’s it ? - how should the shape, weight, width, depth of a sample be ? - can i use some rounded shape of sample with only 100mm in length only in the calculation to get the test done as well ? -thank you-

@mitchwoodwork Ай бұрын

The length of 100mm makes the calculation easy. The cross sectional area should be the same for the sample length, but the shape is not important, so cylindrical pieces are fine.

@teddiie29l21 Ай бұрын

well alright then, no taper, noted. appreciate a lot man 🙏🏻

@DBacaMaker 7 жыл бұрын

YAY! Science! Honestly, though, the information at the end about the application of specific gravity to structure weight was the best nugget of knowledge. For myself, specific gravity was what I measured to determine the alcohol content of my homebrew.

@mitchwoodwork 7 жыл бұрын

DBaca Maker haha, I think home brew testing is probably the most important - then you know how many glasses should keep you away from the workshop

@fathimaraheesap1959 7 ай бұрын

Could you please give the equation to find density of wood log(measurements in cm)

@mitchwoodwork 7 ай бұрын

You need to weigh it in kg, and divide by its volume in m². If you're using cm² instead of m², times result by 10000. If you get a result less than 0.1 or greater than 10 then you've gone wrong somewhere.