Draw ANY Curve with this Free Tool

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Draw ANY Curve with this Free Tool

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Rex Krueger

Күн бұрын

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@ragnkja 4 ай бұрын

Fun fact: the shape you get with the curve bow is not a circle arc, or even a parabola, but a catenary, which is the shape that minimises the forces of tension and compression, making it stronger than any comparable curve. Bonus fun fact: the domes of the Sagrada Familia were modelled upside down by hanging a lot of chains with weights attached at specific points to represent additional loads on the structure.

@RexKrueger 4 ай бұрын

Wow! I had no idea. Thank you for an actually helpful comment!

@patrickstrasser-mikhail6873 4 ай бұрын

Fun fact corrected: What you get is a sinus, the solution to the Eulerian Column Buckling problem with two free ends, with beding stress over the whole length. The catenary is what you get when you hang a rope or chain, with weight pulling in one direction (presumably down). If you need a circle, also a string with two loops at the end, a pin, and a pencil will do.

@vittocrazi 4 ай бұрын

Your comment IS cool. But the part about the pin and thread i dont like, because its actually pretty hard to keep the pen properly aligned😊@@patrickstrasser-mikhail6873

@ragnkja 4 ай бұрын

@@patrickstrasser-mikhail6873 Thanks, I didn’t know they were different, since the catenary is also the strongest shape an arch can have because in that case it minimises the forces of compression. In any case, the shape this bow naturally “wants” to take is inherently a strong one.

@Maker_of_Things 4 ай бұрын

I remember explaining this to a funiture design student when I was still teaching. He couldn't work out where the centre of the circle would be for the curve he drew with a bow! I had to show him the flattened ends of the bow curve to explain how the radii changed the further you got from the centre of the bow curve. Important to know if you want an arc, or just an aesthetically pleasing curve. There is a model at the Segrada Familia with weights and strings showing that upside down design process.

@wyssmaster 4 ай бұрын

"[This antique compass] may be hard to find" Not true! I know exactly where one is. Now if I could just convince you to sell it...

@davidbroadfoot1864 4 ай бұрын

Theft is an option.

@samuelmellars7855 4 ай бұрын

@@davidbroadfoot1864 Strategically Transfer Equipment (to) Another Location

@MK-lh3xd Ай бұрын

@@davidbroadfoot1864You mean borrowing for a little while like 20 years? You guys know better than to steal.

@derbestimmer1148 Күн бұрын

You can build that circle out of wood.

@notreallymyname3736 4 ай бұрын

I know it's more for small curves, but there's also the classic "grab whatever round container you can find and fudge it a little bit" method. Half the curves I saw my dad lay out were done with a 5 gallon bucket, a sour cream tub, a coffee cup, or a Copenhagen can.

@zwicker5585 4 ай бұрын

A string and small nail also works great for any size!

@mthielssalvo 4 ай бұрын

i thought from the thumbnail that you were just going to use the string to draw a circular arc (by pinning one end to the tabletop & tying the pencil at the other). the curve bow is neat but because it relies on tension it doesn't generate a circular curve but a catenary curve.

@bakerzermatt 4 ай бұрын

Those are two different tools to draw two different shapes. Both shapes are useful, but those tools aren't at all interchangeable.

@louisvictor3473 Ай бұрын

Not entirely interchangeable, but in practice often yes. Often you don't need a mathematically precise circle section as your curve, just a symmetric arc between two points and "about this wide", so the difference is non significant

@kalijasin 12 күн бұрын

I’ve seen woodworkers and artists who can draw circles and half-circles freehand and near perfect. It’s some crazy stuff. 😮

@georgeb.wolffsohn30 4 ай бұрын

The curve bow creates a parabolic arc. The compass, a circular one.

@awoogagoogaloo2889 4 ай бұрын

Not parabolic catenary

@vincentroux1510 4 ай бұрын

The "antic compass" is actualy realy simple to make. Just need to pieces of wood, a bolt and nut, a nail to make the pin and a piece of tape to hold the pencil. Even the roughest build will do a perfect job.

@spitandprayers 4 ай бұрын

Nice, I just used a slim cut-off the other day to make a curve, but had to have someone hold the ends while I traced. The introduction of the string is genius!

@kevinbunting826 3 ай бұрын

Thanks. Used this to layout the knees for timber frame

@theromanorder 4 ай бұрын

One trick i was taught but usual fail to do, is get a pice of sting the length of your wood, fold it in hafe and hopd it at the center, use your grathit stick at the end of the string and just turn it around

@vinnycruise 4 ай бұрын

How has this alluded me I was just needing it too. Thanks

@richardseed8253 3 ай бұрын

It's a pair of Compasses A compass is for direction finding.

@WiFiJeremy 4 ай бұрын

Hey, This is super usable, easy, and NEAT. Thanks

@jeffantonio1627 Ай бұрын

you could always use string and something to hold pressure on the centerline of your desired circle

@arloames4517 3 ай бұрын

The curve you get is a cubic. y= ax^3+bx^2+cx+d. Curves drawn for airplane design were drawn using long thin slats of wood, held in place using weights, called ducks. You can use any number of ducks aling the length, and you get a different cubic curve in each segment. Please, the curve isn't a catenary, which is a solution where force (usually gravity) is applied uniformly along the curve. The cubic is a result of force applied at discrete points, resulting in the cubic curve. B-splines and Bezier curves are different formulations expressing such curves.

@arloames4517 3 ай бұрын

en.wikipedia.org/wiki/Flat_spline

@arloames4517 2 ай бұрын

The slats of wood were called splines. Same nomenclature is used for the mathematical ones, also called splines.

@realcolby 2 ай бұрын

This isn’t a catenary or a cubic. An immediate tell should be that cubic equations are not symmetric while this curve is. If you look at the differential equations the solution is actually a half-sinusoid. Look into buckling theory if you’re interested.

@erikjones6970 Ай бұрын

Just drill a couple holes in a measuring tape and lock it in place with a nail or screw. Works for any size circle.

@Papa-in-Tx 4 ай бұрын

You could take that same piece of wood, drill a small hole near one end, and another one at the radius distance from the first hole. Drive a small nail through the first hole and into the wood, and use a pencil in the other hole to draw the circle.

@artimesbabai 4 ай бұрын

OH I love you for this You made my life so easy

@garydargan6 4 ай бұрын

Instead of using knots use a spring-loaded toggle like the ones used to adjust a hoodie. Bend the wood to get the curve you want then lock it in with the toggle.

@kimberlydrennon4982 4 ай бұрын

I'd be interested in a video about making a beam compass

@pettere8429 4 ай бұрын

Quick and dirty beam compass: take a sufficiently long piece of scrap wood, a nail and whatever you wish to mark with, predrill for the nail and scribe/pen, and you are done. Even lazier: nail or pin needle, string and whatever to mark with.

@mohamedzaghlool416 4 ай бұрын

I use metal 1 meter ruler, by length it's flexible and dependable

@jamiesprout2710 4 ай бұрын

I made one of those and have been using it for years. Never knew it was actually a thing lol.

@varno 4 ай бұрын

Most nicer drafting or mathematics compass kits come with a beam extension which gets you to about 45cm radius. These can be had pretty inexpensively.

@jaywalker512 4 ай бұрын

For a circle I just hold one end of a string at the center and attach a pencil at the other end. Then you pull the string tight and draw the circular arc.

@markkieran1004 4 ай бұрын

I really would like to see you make a beam compass - contrasting woods, shiny brass screws and shinier steel points.

@shermanhofacker4428 4 ай бұрын

Might be a good idea to flip the bow and draw another line. If the lines are the same; perfect! If not split the difference!

@mrskateslipknot 4 ай бұрын

100mm rip of 6mm ply makes this sort of thing really well

@graphzaal4398 4 ай бұрын

pencil, string and optional nail work like a charm for me, but shapes always needed a proto. the bow is a nice idea... will try

@davidgagnon2849 4 ай бұрын

The only thing wrong with a curvebow is if you use wood to make it, it may not be an accurate arc, as there are stronger and weaker sections of the wood and it won't bend consistently

@TomsBackyardWorkshop 4 ай бұрын

The curve bow doesn't give you a constant or repeatable radius. Its more of a parabola.

@rottenmeat5934 4 ай бұрын

Apparently, it's a catenary and typically better for taking loads. As stated by @ragnkja

@bruceswanson2811 4 ай бұрын

Patternmakers called beam compasses "trammel points". They could be had to clamp on a stick; another version clamped on a ruler. The better ones had a thumbscrew fine adjustment. A big wooden compass is a fun project. A short bolt, two fender washers and wing nut locks the joint. The other ends can use sharpened nails to scratch a line. You can use adhesive tape and a sharpie or be a truer craftsman and rig up a pencil clamp.

@jameshaulenbeek5931 4 ай бұрын

A similar process is used in the railroad industry for determining if a truck frame (where the wheels are) is bent, twisted, or skewed. It's referred to as "tramming".

@marchess923 3 ай бұрын

A beam compass is also known as "trammel points".

@sandytooks 4 ай бұрын

I bought a beam compass and made an extension for it.

@mircomuntener4643 4 ай бұрын

Re: hard to find large compass: Get me a couple pieces of flat scrap about an inch or so wide, a foot or two ling, with a hole in one end, a bolt, couple washers, a wing nut, nail, pencil, and some tape.

@rottenmeat5934 4 ай бұрын

Hey! You ever used a gouge for chiseling out endgrain? Seems like it would be equivalent to a cambered edge, cutting the edges rather than wedging them out.

@LilyJaneH 4 ай бұрын

My teacher always called the beam compass a set of trammel points, so that’s what I’ve always called them.

@WiFiJeremy 4 ай бұрын

Rex - I'd like to see a video from you on Ticking Sticks. That seems like it'd be in your wheelhouse

@OctavMandru 4 ай бұрын

How about the old string and nail?

@userpandr 3 ай бұрын

Bro invented guitar...

@mitch.paulsen 4 ай бұрын

I want to get into novice woodworking but i have no idea where to get wood! Where do i go? Near Minneapolis, MN in case anyone is local!

@CrazyCamo 4 ай бұрын

Nice

@eus2ks 4 ай бұрын

The Sumerians called. They want their tool back.

@parjau4554 4 ай бұрын

I have this huge Starrett divider/compass that I bought because it was just a lovely piece of formed metal. I'm forever trying to find uses for it so I don't feel guilty for spending all that money on it.

@jimcarter4929 4 ай бұрын

Just tie the same knot you use for tent stakes and tou can move it where ever you want, no problem.

@yourneurdivergentpiers3457 4 ай бұрын

Thats a pair of compasses, a compass points north. You're only a chippy though so I guess we can't expect much 🤷‍♀️👩‍🏭🔥.

@Helveteshit 11 күн бұрын

Meanwhile, I would just take a nail, and scrap Wellpapp and do a hole for a pencil and do a circle xD

@martinpoulsen6564 4 ай бұрын

Well... probably not as lazy as some would like to think. It takes even straight grain, very even thickness and no knots to get the curve even, without certain sections bowing more than others.