A Sine Bar Walks Into a... wait


Comments • 1 893

  • Michael D.
    Michael D.  3 hours back

    This video has helped me a ton! Thanks

    • Todd Cooper
      Todd Cooper  1 days back

      This is insine!

      • Laundry Sauce 2
        Laundry Sauce 2  4 days back

        All of a sudden trig makes complete sense to me now

        • Len Kaufer
          Len Kaufer  6 days back

          Thanks, Tony.
          Ya learned me somethin' that I fell asleep listening to 50 years ago. The lathe setup enlightened me, too.
          Keep the videos coming.

          • Santibag
            Santibag  1 weeks back

            The people that hate trigonometry probably had bad math teachers or some other problems. With a little bit of Khan Academy, most of the people can learn trigonometry well.

            • oddjobbobb
              oddjobbobb  2 weeks back

              Would that someday I make things that will require the purchase of the sine bar, plate, table, gage set and angle set. But I have a more or less serious question. Why do you suppose lace the different items on a scotch brite pad?

              • Exclusivelibary
                Exclusivelibary  2 weeks back

                i really wish you were my trig teacher back in high school. trig never really clicked in my head until now

                • deck monkey
                  deck monkey  3 weeks back

                  That's why the hillbilly in another machining video said he was taught to set his top slide to 30 degrees and always leave it there. Usually you can separate the wheat from the chaff with a bucket of cold water instead of math.

                  • Look Around
                    Look Around  3 weeks back

                    When a scientific word is unknown...best bet it has Greek roots. Like Trigonometry

                    • Schwalm
                      Schwalm  1 months back

                      Im pretty sure that the Sine bars are 2.5, 5, and 10 because a right angle with sides 3" and 4" long, the hypotenuse is 5". It probably makes things easier when they can test things with whole numbers.

                      • mike tabback
                        mike tabback  1 months back

                        You lost me after "angles stuff" but I still enjoyed the video.

                        • Oscar Lewis
                          Oscar Lewis  1 months back


                          Feel traumatised yet?

                          • Username
                            Username  1 months back

                            Is that Tony Hawk Pro Skater menu music? Now that _is_ an old Tony...

                            • Delivery McGee
                              Delivery McGee  1 months back

                              I failed trig twice in college, this made all that stuff make sense.

                              • Kirkland Painting & Repair

                                What does the ToT button on the calculator do?

                                • Paul Proc
                                  Paul Proc  1 months back

                                  Nice job brother.

                                  • Ryan Garrison
                                    Ryan Garrison  1 months back

                                    Sin(angle)=(opposite side/hypotenuse)
                                    Cos(angle)= (adjacent side/hypotenuse)
                                    Never forget the base relationship, chicos.

                                    • fhovie
                                      fhovie  2 months back

                                      You are awesome.

                                      • Belias Phyre
                                        Belias Phyre  2 months back


                                        • Jonathan Matear
                                          Jonathan Matear  2 months back

                                          I wish someone had showed me this stuff when I started out. Although I got good with AutoCAD on the bright side.
                                          I’ll cut any angle you want on a VMC.
                                          It’s funny because I work with toolmakers who know the math but are terrified of the CNC equipment.

                                          • Ernie D. Savage
                                            Ernie D. Savage  2 months back

                                            Love this guy.

                                            • Adam Schnepp
                                              Adam Schnepp  2 months back

                                              Trig gets front seat

                                              • merlin357
                                                merlin357  2 months back

                                                Did I come back months later to rewatch this because I'm in need of a new scientific calculator and wondered which was This Old Tony approved? Maybe.

                                                • constantinos schinas
                                                  constantinos schinas  2 months back

                                                  *rule of 3, 4, 5.* In a 90 degree triangle, small side is 3, large is 4 and diagonal is 5. multiply those with any constant and you can draw right angles anywhere.

                                                  • thisoneisforcommenting ok

                                                    Or you just don't go to a shitty american cancer high school. That helps as well. Your american math is a horror story

                                                    • G L
                                                      G L  2 months back

                                                      Anyone else notice the Sharp SUBSCRIBULATOR? Can't seem to find it anywhere online.

                                                      • Ben McLean
                                                        Ben McLean  2 months back

                                                        I lost it with the part on ladders

                                                        • Brian Crane
                                                          Brian Crane  2 months back

                                                          But I always write my numbers in capitals...

                                                          • Doreen Campervan
                                                            Doreen Campervan  2 months back


                                                            • Edward Oskarsson
                                                              Edward Oskarsson  2 months back

                                                              Fuck med this was a funny video.

                                                              • userwl2850
                                                                userwl2850  3 months back

                                                                Absolutely brilliant video.

                                                                • Surfhead
                                                                  Surfhead  3 months back

                                                                  I just learned more about sine and cosine in 26 minutes than I have in 55 years. Great video.

                                                                  • Paul Price
                                                                    Paul Price  3 months back

                                                                    This is crazy. My grandfather was a machinist and I have a lot of his old tools now and he had a sine bar in amongst his tools and I never knew what it was used for and now I know. Thanks Tony!

                                                                    • Christian Gingras
                                                                      Christian Gingras  3 months back

                                                                      Teaching trigonometry at the same time we learn about our organ is not smart... except if you apply that new math to interesting subject.
                                                                      For example:
                                                                      Paul's dick was semi hard, lifting his 6 inch tool only 45 degrees instead of 90 degrees. Is he in danger to touch the fan blade 3.1 inches in front?

                                                                      • Andrei Taran
                                                                        Andrei Taran  3 months back

                                                                        Where is sohcahtoa?

                                                                        • Andrei Taran
                                                                          Andrei Taran  3 months back

                                                                          Nothing wrong with learning trig

                                                                          • Dale Hall
                                                                            Dale Hall  3 months back

                                                                            FWIW, this retired mathematician thought your video was hella entertaining, and informative as well. I'd come across the notion of a "sine bar", and for the life of me couldn't imagine what its use might be. Thanks a bunch for educating me!

                                                                            • Sausprem
                                                                              Sausprem  3 months back

                                                                              SOHCAHTOA anyone?

                                                                              • Roverman
                                                                                Roverman  3 months back

                                                                                I'm very offended by your political correctness. I come from a time when men are men and we just told it like it was. Straight from the hip with no sugar coating. We didnt care about your feelings when telling the facts. Facts dont care about feelings so why should we? So for the older generation that grew up in the hard knocks school era, make us a video without the sensitivity added. We can take it because we are real men and women.

                                                                                And just like that its winter. See all the snowflakes?

                                                                                • scarletmisfit
                                                                                  scarletmisfit  3 months back

                                                                                  This will be a long comment, but I just want to tell you my life story...well, first of all, unrelatedly [I'm catching your tangential tendencies disease!], I just noticed that as of this comment, you have 666k subscribers. That's pretty beast.

                                                                                  16 years ago, when I was 15, I failed Geometry for the first time. When I was 16, I failed it again. My teacher wasn't very accommodating. He didn't answer questions in a way that I could understand, and I just don't have a head for numbers. Honestly, I just gave up trying to learn a subject I wasn't grasping. I was great at English grammar/spelling, so I was decent at Algebra. Algebra is the same sentence structure as the English language. :P

                                                                                  ANYWAY, to get my second math credit, which was needed in order to graduate, I ended up having to take a correspondence college course online. At 17, I opted to take a math class so simple that it was the same subject matter my 12 year old brother was learning in 6th grade. [For the record, he ended up passing Trig AND Calculus before he graduated high school. He got all the math smarts.]

                                                                                  The point of my story is that watching this video, I started to understand math terms and calculations that I've never understood before. I'm not going to be proficient by any means unless I study*, but...you are a good teacher! If my Geometry teacher had been as engaging as you are, I may not have failed the class twice.

                                                                                  *I probably won't study. I've never needed to know this stuff in my adult life. I mean, it might help with my job [freelance artist], but since I generally do things by eye, I rarely have to do any actual calculations/vanishing points. When I DO have to do those things, it takes a while. I'm sure things would go smoother if I learned enough to easily make that type of calculation, but for right now, I just don't have time.

                                                                                  My mechanical engineer/machinist significant other showed me your channel and I love to watch/listen while I work. You are relaxing and educational and it's fun to be able to understand and hold a conversation with my SO about his work and hobbies. :) I watch many machinist [pro and hobbyist] channels now and you, Abom/Adam, and AvE are my favorites! I've also loved Wintergatan/Martin for years, so I was psyched to see that you were involved in the MMX. Thanks for doing what you do~

                                                                                  • scarletmisfit
                                                                                    scarletmisfit  3 months back

                                                                                    @This Old Tony You're welcome! Perhaps flashlights and ladders would have helped, but...I mean, he could have at least thrown in some bad jokes.

                                                                                  • This Old Tony
                                                                                    This Old Tony   3 months back

                                                                                    nice! I appreciate the time you took to sit down and write. In fact, your comment made me watch this video again. Haven't seen it since it was published. Dang, those were some rough edits and bad jokes. The thing about learning this stuff young is we don't have a lot of real world experience at that point...no context maybe? being able to do dumb stuff with flashlights, ladders, and bad jokes gives me a leg up on your math teacher. But I'll take the compliment! thanks!

                                                                                • Håkon T.
                                                                                  Håkon T.  3 months back

                                                                                  It's been a decade since I graduated high school and now finally the concept of sine and cosine is making somewhat sense.

                                                                                  • hold 'er Newt, shes rearin' ?

                                                                                    Whats that thing do?

                                                                                    • howlinhog
                                                                                      howlinhog  3 months back

                                                                                      Never failed to make me laugh on every one of his videos

                                                                                      • Dik Hed
                                                                                        Dik Hed  3 months back

                                                                                        Hey, You actually did pretty good. It's one of the best explainations of Trig that I've ever seen--the only one that tops it is -- (drum roll, as Old Tony would say) -- MINE. If you relate it to Pythagorean Hypothesis, you will do even better.

                                                                                        • Byron Jackson
                                                                                          Byron Jackson  3 months back

                                                                                          I never understood sine and cosine until now

                                                                                          • GooserFive
                                                                                            GooserFive  3 months back

                                                                                            It blows my mind that you(a hobbyist) are better at teaching math than my math teachers were...
                                                                                            P.s. I dont normally comment but thought I'd thank you for all the laughs and entertainment you have given me over the years. So Thank you!

                                                                                            • Tanmay Thakur
                                                                                              Tanmay Thakur  3 months back

                                                                                              About everything thing in this video ringing two metal peaked my interest most. and sinebars.

                                                                                              • Corey Jacquot
                                                                                                Corey Jacquot  3 months back

                                                                                                Thanks for making this video. Now I can go to work in the morning and not look like a fool when I have to do compound lifter rods.