How to Use a Line Level to Calculate Grade, Slope
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- เผยแพร่เมื่อ 14 มิ.ย. 2021
- Don't have a laser level, find grade or slope fast with a string and line level. Learn how to use string a line-level like a pro to see how much rise and run you have on your work area. I'm building a new house and finding elevations with a string level and tape measures and I also go to my desk to show how to find the angle of elevation, what tangent means, and how to use a calculator to find angle and grade as a percent. Find grade with a line level
Good resources: www.amazon.com/shop/colfaxmath (paid link)
Mathematics for Carpentry and the Construction Trades, amzn.to/3hy0ZUJ
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Good coverage of how to find 2% slope, but also noteworthy that when the bubble is right tight to one side of one of the inside lines (not centered between them), that is a 1% slope, which is useful for things like laying pavers
Very good information
Yes! After about 2 hours of searching, I find a video that shows the rise/run. Thank you, sir.
Glad it helped
Man if they just taught me it this way in school I might of learned something! Thank you well done!
Thank you
I've stated that for years. Schools should have guys like me come and in tell the kids just how valuable math really is, in everyday life, for everything.
Agreed
Or use basic trigonometry and the distance from two locations, along with the height difference. And boom, everhthing you need to calculate the grade.
it’s so much easier for me to understand this stuff when i can apply it to real world circumstances that apply to me. in high school all i saw were numbers on a piece of paper and a clock on the wall.
Great quote " all I saw were numbers on a paper and a clock on the wall"
Great video. Your real world application makes this so much easier to learn the supporting mathematics. Thank you!
Great to hear that
I don’t use this just but I sure will now that I know. Thank you very much. It’s simple and straight forward.
Glad it was informative
Nice job.....clear and concise presentation.
Thank you
You are a great teacher ! Keep up the good work!
Thank you
Best explanation I've heard. Nice job
Thank you
Thank you for using it in the real world. I understand it so much better.
Good to hear
You sound just like Dale from king of the hill and it's awesome.
Thank you
Great video brother this exactly how my land is ..
Thank you for sharing 👍
Thank you
Excellent video!!
Thank you
Thank you for time and efforts
Thank you
Wow! I have a hard time with math but you made it a bit easier. I am getting ready to buy my first property. And maybe last. But one side of the property is flat and the other is more rolling hills. Your equation will help. Thanks!
Good to hear, good luck!
Great lesson Colfax! When I worked sewer and water we would use a laser for grade but we would check our pipe with a 4’ level. If the bubble was just touching the line we would know it was close to a .40 grade. We would have to figure the percentage. We would shoot the high point and low point.(example) If the high point was 25.24 and low point was 29.66 in a 300’ run, we would use the calculation 29.66-25.24=4.42 4.42/300=.01473 X100=1.473 and that would be the number we put on our laser since it recognizes 100’ incriminates. It is gets to be a lot of other configurations when checking the staking since the survey crew works off of sea level elevation.
Great feedback from someone in the field, thank you
thanks for the refresher. don't use it, lose it.
Glad it helped
I really appreciate your video you saved me 900 bucks lol 😆 god bless you
Glad to hear that
In my teaching I wasn't told about the 1/4 line in the level . Thanx great video
I'm glad it helped
thank you
Thank you
I didn't have enough string so I had to do it 2 different times. I placed 3 stakes in ground in a straight line 20ft apart from each other. Stake #1 to Stake #2 came out to 7%. Then I put the string at the bottom of the 2nd stake and connected it to the top of the 3rd stake. That was 21.6%. So now do I combine the two percentages for 28.6% and divide by 2? Or is the total slope 28.6%?
It depends on the length of the two strings. No you don't add them. I'd buy some new string and do it again the whole distance
@@ColfaxMath dang, okay thanks
They sell 10 level bubbles in a little glass jar you can pick it up at the hardware store
Been there before, said they were outback with the board stretcher
Couldn’t you just use a laser to get your grade?
Is this just for math teaching?
I enjoy your teaching very much. Wish I had you as my math teacher.
Yes, laser is better, but I didn't have one. Old school way of doing it. Thank you for the kind words
Do you have a website or some form of contacting you out side of this. I’m looking for some help with math for my current job.
Where did the intro music come from? Did you make it yourself?
No, I think just off of TH-cam
@@ColfaxMath But free of any copyright concerns/accidental music piracy? So for instance, maybe you asked the original music creator or perhaps it was made not to be copyrighted in the first place? I try to encourage people not to inadvertently (or advertently) violate G-d's prohibition of theft.
Very helpful video. Thank you.
Would the 9% grade be equivalent to degrees?
Close but not exactly, 90 degrees is vertical and 100 percent is vertical
@@ColfaxMath Great, do you know what is the best way to do this for working out the degrees?
👍🏾👍🏾👍🏾👍🏾👍🏾
Thank you
👍🏻
Thank you
I want to use this but need reference
What do you need?
Is that not snake in the background
No I don't think so
Why is 26.6 = 26.5 feet
12 inches to the foot