How to miter cut a circle

How to miter cut a circle.

[@simonsezblah]

I've been looking for this knowledge for awhile. Wasn't sure what to search for and have had an exhausting search of dead ends countless times. You are amazing. Thank You!

[@kalannorman3275]

I just have to say man that thanks to you, and your willingness to teach, you have made me "the guy" when it comes to cutting miters on the job site. I work for a home remodeling company and my boss is absolutely amazed at the way I am able to use formulas to work out angles and make accurate cuts. Its made me a lot of money and made me an asset to the company so I just want to extend my gratitude to you man. Thank you.

[@SawdustandWood]

Thats awesome! Knowledge is power

[@robertbraid8006]

This is awesome! I am a non-mathematician building a 5 foot diameter loop on a garden railway. 3/4" 4 x 8 ply is now $100 a sheet. I can now do the loop out of 8" pine instead. Way cheaper.

[@jarmstrong2843]

As a follow-up, you could increase the number of pieces to 20 and the angle would be 18 degrees regardless of the diameter. Each end of each piece would be cut to 9 degrees. This would eliminate the need of splitting hairs finding the right angle on your saw’s mitre gauge. Hope this helps!

[@littlewolfendeavors2132]

How I would do that with ft instead of inches? My circle is a 20ft diameter and I want to build a base to place a dome. I will be using 2x6 pieces.

[@jarmstrong2843]

@@littlewolfendeavors2132 There are calculators on the Internet that can figure this out for you. Or, you could draw something to scale on paper to get the needed dimensions. Use an architects scale to get things down to a manageable size on paper...let's say 1/4" to 1/2" = 1 foot...or if you have a larger piece of paper 1"=1 foot.

[@littlewolfendeavors2132]

@@jarmstrong2843 thank you

[@andrewscarlett2225]

Basically the only adjustment to get your correct diameter is the length of the inner side between miter cuts?

[@calvinlum]

thank you so much for this video! this is definitely the best video I found to help make a circle without a router or jig saw. I used this method for 2 of my wood projects and it worked! It's difficult to get the miter saw at the exact angle and there were some small gaps in between, but it wasn't anything some good ol wood glue and painter's tape couldn't fix. I will reference this video in my description for upcoming videos. thanks again!

[@SawdustandWood]

Thanks

[@jgreengusa]

I used this video to figure out at which angle to cut bricks for a circular patio. Thank you for the well explained steps.

[@teddobbins8135]

Thank you for this video. You explained clearly what each number was used for and why it was needed. With your explanation I can work back with any of the numbers I need.

[@mariantoader1260]

Very easy to understand. I certainly didn't waste my time watching this video. Thank you very much for your help. Greatings from Romania !

[@howtotieknots3749]

Man thats great I think I'll use a circle around my plain clock thanks you are one of the best

[@nadinecius8747]

Did not even know it was possible to make a circle using a miter saw. I recently purchased a Hitachi 10 inch miter saw. I went on the Hitachi website and watch a video on how to make inside/outside corner miter cuts and it went right over my head. Then I watched your videos and got it. Your videos are short and simple. So glad I found your channel!

[@SawdustandWood]

Nadine Cius I’m glad you found my channel also! I appreciate your kind words! Have a great day!

[@jarmstrong2843]

Perhaps this might make things simpler: Always use 16 pieces in circle. The angle to always cut will be 22.5 degrees. This makes each end of each piece 11.25 degrees regardless of diameter. So using your example of 37.69” for a 12” diameter circle : 37.69”/16 pieces = 2.355”/piece You may have to sand each piece lightly to make a more precise fit. Try it, you might like it.

[@DanDDirges]

2.355 would be the short part of each piece. Do you know how to find the long part? So to set it up for repeat cuts on the saw.

[@jarmstrong2843]

@@DanDDirges See www.blocklayer.com/woodturning-segments.aspx marleyturned.com/Shop_Utilities.html Do a word search on Google or other search engines on “Segmented piece calculator for wood turning” or something to that effect. Keep in mind that as you build upon each ring of segments, the top and bottom edge lengths of each segment will change. Use this he formula to calculate: Pi x diameter = circumference Circumference / 16 As you increase / decrease the diameter and keep all all the angles the same, the length of the long side will take care of itself since you already know the short side from the calculation. The long side also dictated by the width of your wood stock. A wider piece of wood will have a different long side length than a narrow piece.

[@DanDDirges]

@@jarmstrong2843 Thank you very much!

[@jarmstrong2843]

@@DanDDirges Suggest you visit Woodcraft, Rockler, Craft Supplies USA web sites. They all have materials on segmented turning ( books, software, templates). These can make life much easier for segmented turning projects. Also suggest looking for videos on KZbin and Internet on how to build a sled for your table saw to make segmented pieces quickly and accurately. Hope this helps.

[@tommyguacamole]

Thank you so much! Doing 4x4 pressure treated around my pool and had no idea how to do it till I found this video.

[@FormerlyKnownAsAndrew]

Hey man, you did a really great job with this video. You explained it thoroughly.

[@MrSamromanus]

You made my difficult day easier. Thank you very much for the calculation 😊

[@alisondaniels1427]

I have learned more from ur videos than all de other tubers so easy and easily explained ie math .angles .everything basically keep up the good work son all the way from ireland

[@SawdustandWood]

Alison Daniels thanks my friend! All the kind comments make it worth my time! Have a great day!

[@dbconstruction7892]

Brilliantly easy way to explain how to do this task. Thanks for your insights. To build on what you've shown here, instead of doing multiple calculations to sneak up on the length needed to get to an even number of pieces to make the circle you can go the opposite way and specify the number of pieces you want to use to make your circle in the second formula and the result will tell you the lenght of each part. So, to specify 13 pieces you would divide 37.69 by 13 to get a length of 2.899 inches per piece, which is very close to your 2.9. Then, if you want to make the circle from 25 pieces the length of each piece would be 37.69 divided by 25 = 1.51 inches. Then the third formula would be 360 divided by 25 = 14.4 degrees, divided by two in the fourth formula to get 7.2 degrees as the angle to set on your saw. Math is awesome when you can apply it to real world situations!

[@SawdustandWood]

That's a great catch! Thanks for your thoughts and input. How did I miss that.....lol

[@MindBodyMuse]

FYI, did you know all the numbers you laid out (with the exception of 13) add up to Tesla’s 3-6-9 theory! Even in your added post, which talks about using 18 and 9 degrees. Little did you know you’re creating a piece that resonates on the 369 frequency!

[@jeffcarr392]

You could of course turn your formula upside down and say how many pieces (or sides) do you want, from there you could calculate how long the pieces should be. Great vid

[@josephsidlo3893]

Thanks for the much needed formula!

[@johnnyleeway3466]

Damn dude....it's rare that the first video I click on gives me exactly what I'm after! Great job! Thanks

[@klaudyaconcepciongraciavan8695]

I'm trying to learn all about angle cuts in wood. Very good video. Thank you.

[@barrytalbot2442]

thanks for this info been struggling for hours trying to get this right

[@davidnleeh4]

Mathematician??? Thank you so VERY MUCH for posting your videos on here!!!!

[@waynerollack1026]

Thanks for sharing this. Excellent instruction!

[@amatamat55]

Thank you for the lesson, it has been very useful and very much appreciate it thank you for the knowledge.

[@carr869]

Love it. Thanks for taking the time to make and share this video with us.

[@Vincent-gt3gx]

Good job I like your teaching style!

[@themeat5053]

C'mon, that's beautiful. How simply you put things so even I can understand the process. You need to be a trade school teacher.

[@SawdustandWood]

Thanks my friend! I do love teaching and learning.

[@edhaskell1554]

My daughter in law wants a "round" pot rack for kitchen. Your formula is just what I was looking for! Thanks much. How did you connect the pieces? (biscuit, glue,?)

[@ladykenja2700]

- W O W ! ! ! Another GREAT project.

[@naveedtaj63]

Dear sir i m just beginner want to learn the woodworking but i have no option to higher the teacher,but now i m very hopeful to listen you.God bless u sir

[@jessedunn6169]

Ive used this on many diff projects now thank u. Made a banjo and big wooden mallet now working on a round top toy box.

[@sethgold6950]

Thanks a lot, and a big 👍 from Germany 🇩🇪

[@u2ooberboober]

Great info! Thanks again!!

[@SawdustandWood]

u2ooberboober you’re welcome!

[@Artbymackerson]

Awesome! This really helped me at work. Thank you

[@justinlogue31]

Thank you! Finally I can get this done.

[@brianoberhausen5153]

Great explanation! Thanks

[@woodfood1]

Thank you this really open my eyes ,this what i need thanks

[@TLBurriss]

Great help. Thanks for this.

[@hytim9007]

Thanks! Very informative

[@dibujandocondelein1509]

Thank you very much for this video this is what I was looking for :)

[@nattodatto]

Thanks for this video! I'm going to make a clock using this method, only with 12 sides, so that I can get away with just inlaying small marks in the face to signify the hours

[@cybersewingschool874]

This was brilliant!

[@Redspath]

Would this work standing the blocks up on end as I'm figuring out angle/degree to cut for drum frame for 12 inch drum

[@ValioMadre7]

Munchas gracias desde la frontera.

[@SawdustandWood]

You're welcome!

[@dexterforeman]

Good video you explain everything so simple thank you for not COMPLICATING SIMPLICITY!!!!!!! in your videos.

[@SawdustandWood]

Thanks!

[@82camino96]

Always great content sir.

[@SawdustandWood]

Thanks

[@curtboutin8147]

Very nice explanation. Just what I was looking for. What part of South Louisiana are you from?

[@christopherwiddis8453]

Thank you , perfect info

[@shelbyschofield2328]

What if I have a 18 foot diameter how many pieces would I use and what angle would I cut it on? I’m having such a hard time figuring this out.

[@edwardsparks8809]

Very good info, been using your information..

[@sarahbrett8502]

Hi thank you for your video. I'm calculating a large circle with a diameter of 212cm I make this 6 pieces with a 30degree cut each end is this rights ?would it look better with 12 pieces at a 15 degree cut?

[@Deiquantum0123]

Easy to understand. Thank you

[@mohangsk3759]

Thanks for your idea. I wam going to try it .

[@johnnierea643]

Okay that was a good video I need to know how do you fasten together

[@johnbrooks1422]

Great video but I want 26" circle tryed to work it out but no good Please can you tell me how long it is and what is the Miter setting thanks

[@macmasks]

That’s pretty awesome. This figures for the inner diameter only, since different different width wood effects the outer diameter. If I want to make a circle knowing the outer diameter only and don’t care wheat the inner ends up as. For example, a play house screen door with round top. can I say, subtract 7 inches (3.5” wide wood x 2 sides) from the door opening diameter and then go with your formula from there? This assumes the round top of the opening is a circle and not an oval or course.

[@waltp9509]

This figures inner or outer. If you cut the pieces so the long side is 2.9 inches the outer diameter will be 12 inches. And the more pieces you use to create the circle (say 36 instead of 13) the more "circular" your door will be.

[@TheScrubudine]

I am using 4x4s for the circle and the formula is not quite right, what do I need to change to make it work?

[@sjoseph3942]

Thank you!!!

[@scottlang3075]

Looking to make a large circle, 26 ft in diameter, 20 sections of 2x6..but can’t figure that math 🤦🏻‍♂️ help? Trying to make a prefect circle, but then need to figure the curve in each 2x6. Any thoughts

[@jbcom41]

Hi Sawdust - looking for some assistance if you could kindly help or point me in the correct direction, I would be greatly appreciated - I have an window Arch front door, Diameter 53” but when wood it cut and laid out, the actual diameter is 44” - short of 9” thinking if I add the difference of 9” taking it to 62” will this hopefully fit? I am not a wood person, my field is ICT so totally knowbie at this wood stuff 😊

[@toddmerrill7288]

I would like to make a 12 foot diameter circle out of 2x4’s . What would the math be for each cut?

[@aj210]

Hello.. am not sure if you are still active on this video since its almost 5 years old. But I am doing a school project for a wooden cylinder 24" in diameter. Almost double the circle you did .. I did the same formula you explained but I am still not getting why do I need to divide by 2 at the end. I got a total of 26 pieces at 2.89 inches. Would you be able to help figure out the miter angle 🤔? I got it at 6.9° following your instructions but I am not sure if thats accurate. I would extremely be thankful and greatful to you help.

[@user-fq8kb2sn6b]

can you show a formula for 1/2 a circle? i need to do an arch over a niche?

[@alanrichardson7244]

Is 2.9 tge long side or the short side?

[@naveedtaj63]

God bless you sir 🙂

[@erikamcd3959]

where did you get the 13 from?

[@masonjones15]

How far away did you put the block

[@serenityacres]

Where did you get the 2.9?

[@coryernewein]

Thanks brother🤙

[@justahumanwithamask4089]

This is going to be hell to cut without powertools

[@EthanVandal]

You could more easily use 16 base numbering and eliminate the confusion and uncertainty. 16 pieces into 360º is much easier than 13. I have no idea why 13 segments would even become a number in these formulas unless you specifically are limited to using 13 segments for symbolic reasons. Find the outer diameter of the circle and divide by 16, not 13. You'll thank me in the end.

[@kirankandukuri4151]

Super

[@OBS.Rey__]

👍

[@mariadejesusr]

I divided 180° by 13 pieces and got 13.85 and so I played with the size of each piece to get my desired width.

[@WHATAGIRLWANTS2009]

You can purchase a ruler that is in tenths of an inch to make your life easier.

[@christopherjones5627]

Hi. Can you help me. I need to make a 7 foot/ 84 inches wide can you help me please? Thanks in advance

[@Bricky-gs3lp]

I learned this stuff in grade school.

[@EvolutionPowerTools]

Hi Sawdust and wood, do you have an email address where we can reach you? We'd love to chat to you about something.

[@jbcom41]

Hi - when you say 2.9 inch is roughly 2 7/8 inch - can you please explain this? as I am confused to what you mean? many thanks John

[@jbcom41]

think I understand now, the 2.9 inch is on the tape as 2 7/8 inch - from UK :) mm

[@SawdustandWood]

@@jbcom41 that’s correct

[@patrickbrander1775]

3:19 Why is your montage music INFINITELY louder then the rest of the video?

[@SawdustandWood]

Patrick Brander it’s my fault I don’t ever remember to turn it down while editing

[@moisesrobles7884]

Contact a woodworkers in San Antonio TX area I would like to talk

[@stacheramichael]

Thanks

[@dclinks]

its not an actual circle. just represents the diameter of one

[@waltp9509]

While I approve of your use of PI to get the linear length of the "circle" (37.69), your "secret number" makes no sense. Decide how many sections you want (13, 12, 36) and divide THAT number into 37.69 to get the length of each piece. In your example of 13 pieces 37.69/13=2.899. Then divide the number of pieces (180/13) to get your miter angle of 13.84615. By deciding on the number of pieces (say 12) you can get a much cleaner angle-- 180/12=15 degrees. Better yet, after multiplying by PI, round up or down to 35, 36, 38, or 39, whichever makes your calculations easier based on the number of sides. The extra length is not going to impact the size that much. Rounding to 39 (easily divisible by 13) will increase each of your 13 pieces by 0.1 inches and can be sanded down if required.

[@WHATAGIRLWANTS2009]

You can work with a cross sled jig on table saw (many examples on here) and you'll get better cuts and joints. Miter saw is not real exact.

[@gunniteclan]

Divde 37.69 by 13.

[@squarelevelplumb]

360 degrees divided by 13 pieces equals 27.6923077 degrees. Divide by 2 equals 13.8461538 on the miter saw. Diameter makes no difference.

[@GiRDaP-uq1ii]

2.9 what? ı cant speak inglish ı did not understand

[@amini82ka]

Too much of calculations

[@nannettebattista3047]

I did it myself. I used Stodoys woodworking plans for this.

[@jorgeriosist]

P I u 8

[@moisesrobles7884]

Contact a woodworkers in San Antonio TX area I would like to talk