TIP: Quickly Divide a Circle

Рет қаралды 108,970

9 жыл бұрын

A quick super accurate way to divide the circumference of a circle.
Just find the number of points you want to divide the circle into in the list below and multiple the radius by the value (e.g. 5 slices of a 4" diameter circle would be 2 * 1.1756) then set your calipers/compass
3: 1.7321
4: 1.4142
5: 1.1756
6: 1.0000
7: 0.8678
8: 0.7654
9: 0.6840
10: 0.6180
11: 0.5635
12: 0.5176
13: 0.4786
14: 0.4450
15: 0.4158
16: 0.3902
17: 0.3675
18: 0.3473
19: 0.3292
20: 0.3129
The multipliers above were calculated with the following formula
DEG = 360/n where "n" is how many points around the circle you want
sin(DEG/2)*2 = your multiplier
Here is a link to Jack Houweling's page: / jacka440 I highly recommend you check it out.
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Пікірлер: 133

@1976ClassicCelica 9 жыл бұрын

Any kind of quick tip are always invaluable. Once you use this formula a few times (of just follow a table) it wouldn't take much to quickly calculate a new angle.

@drpiatt 7 жыл бұрын

Thank you. I appreciate the time you took to do this. Great demo and explanation of the trig involved. Quite user friendly. Much appreciated. I enjoy tips like these. Great job, keep them coming!

@TabLeft 7 жыл бұрын

Thank you =)

@chrisjohnson4386 5 жыл бұрын

Very clear and easy to understand. Thank you. I needed this to properly plan out an impeller build.

@FinnCrafted 8 жыл бұрын

Just now found this tip. Easy and clear. Helped me out, thanks!

@TabLeft 8 жыл бұрын

+FinnCrafted Thanks!

@Conqueror285 3 жыл бұрын

Excellent video!!! Exactly what I was looking for 👍🏻

@Chriswhynot1898 4 жыл бұрын

Best description of what sine is and how it works that I’ve heard ~ and I’ve been looking for awhile

@Birchbayaromatics 8 жыл бұрын

LOVE THE TIPS AND TRICKS, ESPECIALLY WHEN YOU EXPLAIN THE MATHS. KEEP THEM COMING

@TabLeft 8 жыл бұрын

Thanks!

@DonsWoodies 4 жыл бұрын

I knew about this way of dividing a circle from my years of working as a machinist. However, just ran across the need for this after being retired for a couple years. Great tip about using the dial calipers to set the compass. Hadn't thought about that, and was using my old Starrett scale. The calipers make it a bit easier. At work, always had a computer and a drafting table for this sort of thing.

@randyrru 7 жыл бұрын

This was both quick AND practical. Most enjoyable and functional tip! Thanks for this!!

@TabLeft 7 жыл бұрын

+Randyrru Rhino thanks for watching!

@tjweim5785 9 жыл бұрын

Just found your channel, great tips, keep them coming. Thanks

@TabLeft 9 жыл бұрын

TJ weim Thanks!

@bjen2005 4 жыл бұрын

Just used this info for making a welding rollout wheel. Glad I cam across your video

@F5FURU12 5 жыл бұрын

Now the way you explained it, made it a lot easier . Thank you

@MRSBRHODES1 7 жыл бұрын

Thanks. I used your method to evenly divide some copper tubing wheels I made to place the holes for spokes evenly around the perimeter. Very helpful and accurate using millimeters. The maximum diameter of the largest was 20 inches.

@scottcardais3560 5 жыл бұрын

Thank you for this. Just a note for EXCEL users like me that tried to create an EXCEL spreadsheet using the formula described in the video. I couldn't replicate the results until I learned that the SINE function in Excel expects the input to be expressed in RADIANS so the result of Step 1 in the video (51.428...) needs to be converted to degrees by multiplying by PI()/180. Use the result (0.89759...) in the SINE formula. Then it works exactly as described above.

@TabLeft 5 жыл бұрын

Scott Cardais great tip!

@TaKeTiNaHawaii 7 жыл бұрын

Wonderful! Works great, a real time-saver for the protractor-less. Using it a lot.

@TabLeft 7 жыл бұрын

👍👍👍

@fredsasse9973 3 жыл бұрын

Thank you for a most informative video! Like many others who commented here it was a great refresher on my long-ago trig studies. I was attempting to create in MS Excel spreadsheet where I could simply plug in the bolt circle radius and the number of holes and have it calculate my hole center-to-center distance but at first I was getting numbers that were off from yours. I finally realized that the Excel sine function calculates in radians, not degrees! Once I plugged in the appropriate conversion from radians to degrees it worked perfectly.

@TabLeft 3 жыл бұрын

Fred Sasse haha yeah I run into that a lot too I’m a software engineer by day and most of the trig functions are in radians which I confess I’m not as comfortable with.

@dicksargent3582 Жыл бұрын

If your going to use a calculator why not just divide the circumference by the number of sides you want . Set your compass or caliper to that dimension and step off around the circle.

@osoriochongo6601 4 жыл бұрын

Thanks! You made me understand even before the end of the video.

@dazman1973 5 жыл бұрын

Excellent, just the information I was looking for. - Thanks. 👍🏻👌🏻

@Ausblack 3 жыл бұрын

Spent the afternoon trying to figure out how to space my welds on a circular fan shroud so it looked decent. Now I know how, and knowing is half the battle.

@billr8667 4 жыл бұрын

Thanks for posting. I was trying to figure out the radius of a circle that could allow 8 couples (each located at one point on the circumference to sit at least 12 feet apart to maintain safe social distancing for happy hour during the caronavirus lockdown. Based on what you provided, I think I have it figured out. Now I need to go out to the island on our cul-de-sac to measure and place some stakes (NOT steaks) where our neighbors need to place their chairs! It looks like we'll need a circle with a radius of alomst 16 feet.

@josearrue4072 9 жыл бұрын

Great tips. They always are welcome and keep them coming. Regards from Panamá

@TabLeft 9 жыл бұрын

Many thanks from California!

@philipclarke6277 4 жыл бұрын

Love this practical approach to math for craftsmen. More of this theory please. Ps: love whats on your desk top...speaks volumes. I have the same SS D shackle on my desk

@timmer9lives 7 жыл бұрын

Yea...That's great man. And it's very quick IMO. Thanks for posting.

@Slowwpez 9 жыл бұрын

This is great. Really enjoyed watching it. +subbed

@TabLeft 9 жыл бұрын

***** Thank you!

@tristonzismer1590 8 жыл бұрын

I like these kind of videos really helpful!

@TabLeft 8 жыл бұрын

Thank you!

@asdhakjd 9 жыл бұрын

Awsome explanation man

@robbropyro3283 5 жыл бұрын

Thanks for sharing never would have imagined needing to know this in my life but iv got a great idea for a fireworks effect that requires.

@DaveDurant 9 жыл бұрын

Pretty cool - I'd definitely like to see more things like this.. Thanks!

@TabLeft 9 жыл бұрын

Thanks! I will keep them coming.

@mikeoconnor4692 8 жыл бұрын

Loves tips/tricks of the trade vids!

@pedalpetal 3 жыл бұрын

Thanks for this!

@aoreliasamantha5339 8 жыл бұрын

thx! I like it a lot! Thank you for sharing and explaining it so well!

@TabLeft 8 жыл бұрын

Thanks for watching :)

@les2934 8 жыл бұрын

Great videos! I just happened on to your videos and watched quite a few Thanks

@TabLeft 8 жыл бұрын

Thanks :)

@lancelogue9183 8 жыл бұрын

thanks for taking the time sir

@TabLeft 8 жыл бұрын

+lance logue thanks for watching!

@dogsenjoyinit7659 8 жыл бұрын

You're a lifesaver!, I was really frustrated with not coinciding points

@TabLeft 8 жыл бұрын

+omer khan glad I could help :)

@hondaguy86 9 жыл бұрын

Great tip!

@warranty_voided 9 жыл бұрын

Thanks!

@moonolyth Жыл бұрын

Thanks from an un-smart un-savvy guy that likes to build lots of stuff to fight of boredom. Today making a wannabe surgical lamp lookalike from good will parts.... unusually shaped pots and pans Hah. Needed a nine part devision but this was so much better. Sweet for so much more. 💜 Good will!

@anri2193 4 жыл бұрын

Thanks for sharing, great idea to apply on my new Turk’s head knot jig

@haydenhobgood9132 8 жыл бұрын

Great tip thank you!

@TabLeft 8 жыл бұрын

Thanks for watching!

@fabriziodanilo9018 4 жыл бұрын

Thank you!

@pennyoflaherty1345 4 жыл бұрын

Thanks for your assistance-- I'm currently processing an endecagon star .marking out is concisely required although I believe my formulae will be deg 3( cubed) 4a sphere. Great 2C if this works ! Trent

@mouldyoldcrow 6 жыл бұрын

Thanks very much.

@granitestatemike 9 жыл бұрын

thanks for a great tip...

@TabLeft 9 жыл бұрын

granitestatemike Thank you!

@bobf2130 8 жыл бұрын

great video, how would you figure to get the opposite side to be 3.75 inches total length with 8 equal parts, what size circle would you need. Thanks in advance

@jboconnor412 8 жыл бұрын

Used to know that, but if you don't use it, you lose it. Thanks for bringing it back.

@TabLeft 8 жыл бұрын

👍👍👍

@clarkykev1 2 ай бұрын

Hello I need help dividing a circle into 6. So I’m doing a circular hanging light that has 6 lights off wires and I need them spacing evenly. Any help would be great Tia

@ianside33 9 жыл бұрын

thank very help full

@jayvym 4 жыл бұрын

What is the exact apps name of the scientific calculator on Android? I tried search power one xl.

@jamescosta1174 2 жыл бұрын

Thamk You

@huguitopablito5740 4 жыл бұрын

cool staff what if you want to use desmos and divide a circle into larger number. what would be the equation?

@johnmorrow4719 3 жыл бұрын

Nice presentation. I had asked if there was an easy way to cut it up smaller than 3 degrees. Many nights I fall asleep almost getting there.

@DavidParker-cf2km 9 жыл бұрын

multiply -> "... list below and multiple the radius ...".

@KS-fw9hz Жыл бұрын

This is great! I'm guessing you could use this with ovals as well?

@stevenmason1674 9 жыл бұрын

How weird. I came straight here from watching the same Jack Houweling video. Great explanation Thanks.

@TabLeft 9 жыл бұрын

Steven Mason Thanks!

@rosscoyates 7 ай бұрын

I had always thought that it was an inverse linear relationship. So for 7 points it would be 6/7 times the radius. 6/7 = 0.8571 not 0.8678. It is very close on all the multipliers but always just off a bit.

@veritas5008 6 ай бұрын

Absolutely brilliant! Your explanation and demonstration was crystal clear. Thank you. 👇 Oh, yes, where did you get your compass, looks great. 👍

@lrmodranoel 7 жыл бұрын

Nice.

@soulslikebirds 8 жыл бұрын

I suck at math. That was nice to see. Thanks

@TabLeft 8 жыл бұрын

Me too! Thanks for watching =)

@cdanil1670 8 жыл бұрын

hello would have the possibility of putting subtitles in Portuguese in Brazil

@Highlander25031 Жыл бұрын

Why do you divide by 2 in the formula? Where does dividing by 2 come from?

@ukidding 6 жыл бұрын

Math: you can use sin A/a = Sin B/b also. Don't need to divide triangle in 1/2. A is centre angle, a is what you want to solve for., B is base angle of isosceles triangle and b is radius.

@jaghook 2 жыл бұрын

HELP. HELP HELP,,,,A normal circle has 360 degrees,,,,,,how can i create a circle with 147 equal arcs of degree. Or to put it another way, How can i create a 360 degree circle, with a 260 mm diameter, divided into 147 segments of arc, each with an angle of 2.4489795 of a degree. Any help will stop me breaking down, regards Jim

@erosangelos9422 3 ай бұрын

Hello! Your video Info is very Good I appreciate ,,Only issue is the Camera angle shining on the calculator and cant see what youre doing and all is good ,Please change the angle a little bit and good to see you again )). Thank you!

@patrickboyd2704 3 жыл бұрын

Like it let's see more

@sdmaft 8 жыл бұрын

Thanks for removing the cobwebs. I guess it's true when they say, "Use it or lose it." Keep 'em coming. By the way,, is that a bowl of coffee beans on your work surface?

@TabLeft 8 жыл бұрын

Thanks! And yes it is, I on occasion smoke long churchwarden (like a hobbit) pipe and I use the bowl of coffee beans to keep it up right when I set it down.

@prassmancreations3168 6 жыл бұрын

2 X Pi X radius = circumference. . . . then divide by 7 . . . . easy & simple. You made this look really hard.

@TabLeft 6 жыл бұрын

Jesus Alsalbador that will give you the distance “around” the circle not the chord length that you need for dividers...

@prassmancreations3168 6 жыл бұрын

Divide the circumference into how ever many sections you want. For your instance it's 7 (heptagon). Then set that measurement on a protractor & mark the indices around the circle using each as the center point for the next index mark.

@prassmancreations3168 6 жыл бұрын

there's also this way kzfaq.info/get/bejne/mauilsagrdvNaZs.html

@TabLeft 6 жыл бұрын

You understand that arc length does not equal the chord length right? The chord is the distance the dividers need to be set too. Dividing the circumference will get you the arc length which is the length of each divisions only of you were traveling “around” the circle, but the dividers DO NOT do that. they connect two points on the circle and the straight line that connects those points (the chord) is the distance you want. Simply try your method and you will see what I mean.

@TabLeft 6 жыл бұрын

That is significantly slower and more complicated than the method I showed. I’m not sure what your point is.

@MrPaul278 7 жыл бұрын

Brilliant, any tips on getting 30' only using a pair of compasses

@TabLeft 7 жыл бұрын

30’ as in 30 feet? Or was that supposed to be degrees?

@MrPaul278 7 жыл бұрын

Degrees, sorry, couldn't see button.

@garrett6064 5 жыл бұрын

@ 3:00 "So let's jump in."

@nigelscrimshaw3862 9 жыл бұрын

Bit confused . your words "sin(DEG/2)*2 = your multiplier" are you meaning the radius of 2 inches when you use "*2 ="

@TabLeft 9 жыл бұрын

The formula gives you a multiplier that will be used on the radius. The *2 never changes only the degrees (360/N) So if you were dividing the circle by 12 the formula would give you 0.5176. And if you had a radius of 5". 5*.5176 would give you the distance to set you calipers .

@Deadround34 7 жыл бұрын

TabLeft Workshop I found a problem with your formula when doing it in millimeter. so here it is for those of us that's not from USA deg = 360/n where n is number of holes (sin(deg/2)radius)2 so that's my solution for doing it in millimeters if i don't multiply your multiplier i get 24 holes.

@Deadround34 7 жыл бұрын

[sin(deg/2)radius]2

@BISHOPSAGODCHASER 8 ай бұрын

Application for horse pin at: 100diameter, plz On the job I deal with 10’ circles (# of post to corral) to 200’ circle/pin to corral. Awesome 🤩 share my application is on larger scale Thanks 🙏🏽

@edenlazer8633 Жыл бұрын

divide a circle by 13

@inskinov412 2 ай бұрын

But what is the (SIN)..........?????

@STIZEN9 9 жыл бұрын

bro you tried to make this easy but I became quickly confused- what the heck is sign?

@TabLeft 9 жыл бұрын

STIZEN9 its described at 9:04 the various trig functions on your calculator SIN,COS,TAN are really just dividing the length of various sides of a right triangle.

@sibalogh Жыл бұрын

Your displays are glared out by the light...

@michaelyoung6043 Жыл бұрын

Love math 😂.

@ReplicateReality 5 жыл бұрын

too quiet

@tedtate57 8 жыл бұрын

there's glare from your light hitting the calculator, can't see what you are saying. Also, you are confusing and talking way too much. 360/ any amount will give the degree location. Why are you trying to make this simple function so complex?

@morganwilliamcomedy2836 5 жыл бұрын

Quickly watch this 10 hour video

@TabLeft 5 жыл бұрын

MORGAN WILLIAM comedy hours, minutes, basically the same thing right... 🙄 or you can read the description...

@mashtali1 8 жыл бұрын

that's neither quick, nor practical.

@TabLeft 8 жыл бұрын

Wrong but thanks for playing!

@laurarees1714 7 жыл бұрын

How do I subscribe?

@sibanisikdar8099 6 жыл бұрын

practical, quick, fundamental, general and presented very well

@francc2366 4 жыл бұрын

IM deaf, title said quickly....2 min 44 there's still no drowaing?!?!?!?

@TabLeft 4 жыл бұрын

The technique is quick, not the remedial math tutorial moron. From the looks of it, you can probably use a few English lessons too. Get your shit together.