Number Three’s Controller

April 1, 2024October 14, 2024 Lutin

This post is an old one we forgot to publish a while back. Currently, Number Three is controlled by a script that is run on a Raspberry Pi sending commands to an Arduino. But originally Number Three was controlled by a wireless relay switch. We used wireless relays at first because they are simpler and we could just focus on the mechanics of the robots. As our robots got more complex, we had to migrate to Raspberry Pis. This post is a good overview of wiring a relay and even if outdated gives good insights. Also, a wireless relay may be useful in other situations.

Please note, this material is provided for informational purposes only and is not a guide on how to create the designs. Please take a look at our disclaimer.

Here is a 12-volt, 16 relay wireless board. It is typically used for lighting but we have other purposes in mind- robots! To begin here are some basics. To control motor you change the power going it. A motor needs positive (red wires) and negative (black wires) energy to work. A relay controls power going to an engine. When wiring a relay the wire that gives the signal (what tells the relay to be on or off) is usually a color other than red or black. In this case the color is light blue.

Honestly there is not too many parts to this build just the relay, linear actuators, wire nuts and a lot of wires. We recommend doing the build in an area easy to clean and free from pets. When you cut the wires little bits of wires can fall to the floor may end up in the foot o a pet.

The wiring for the relays proved to be more difficult than we thought because the wires were slightly thinker than the connection wanted. We had to twisted them tightly to fit them in. If you are buying wire go with a thin grade.

When doing a wiring job of this scale, over 64 wires, it is best have a plan laid out before starting and if possible divide the labor. Our plan was to wire in order or wire type (signal, positive, negative, output). To make it easy we cut all the wires the same length. To attach the wires we used wire nuts but have migrate to using lever connection nuts for quick builds. The wire nuts proved to be too finicky and we don’t recommend them until the final build.

Here is a pile of pre-linked positive wires. Since we wanted to control a linear actuator we need to use two relays to control on the power. To make an actuator extend and retract you need to you flip positive to negative, this is called reversing polarity. But one relay can on turn power on and off. So to be able to reverse polarity we needed to wire XOR logic gate. This is a good overview of how to control linear actuators and here is a good diagram on a XOR XOR logic gate.

Here is the completed relay ready for testing. Make sure all the wires are screwed in tightly and no fray wires are touching before pugging in the relay.

And what better way to test than knock something over and make a big mess!

Here is the new controller installed on the back of Number Three. Since we are aiming for a steam punk robot the mass of wires is exactly the look we wanted.

Happy Creating!

Cosplay Dragon Tail

March 30, 2024October 14, 2024 Lutin

One thing we have always been jealous of is tails. Cats and dogs flaunt them as they strut around waving them in the air. So when making our dragon costume, we wanted a moving dragon tail that seemed alive. Not a dead tail, but one that had a personality of its own.

We searched through our past builds and thought the joint work on our little wooden robots would do the job. We also so some cool designs on the web like this one.

Please note, this material is provided for informational purposes only and is not a guide on how to create the designs. Please read our disclaimer.

Parts needed to build a cosplay, wooden, flexible tail.

This build just needed some wood, bolts, wood glue, rubber bands and lots of duct tape.

sistering two wooden dowels

Since we wanted the tail segments to interlocked we glued two pieces of 2X2 wooden dowels together. Be careful not to put too much wooden glue, it just needs a thin coat. Make sure to give it two days to dry, you don’t want it to come apart when you start cutting.

Measure out the segments carefully. You can vary the lengths depending one what look you are going for. We went with four inches length on the top part and one inch slots on the backside.

Here is a view of the final design. Each segment will have the same “hat” shape.

Each hat will fit together in an alternation pattern. We tried making the segment in “z-shape” but it did not move as organically as the “hat-shape”.

After carefully measuring, we used our trusty drill press to make the holes. Try to make a tight fit for the bolts. If the holes are too big the tail, may stick over time as the bolt cuts into the wood.

Now it is time to assemble! It fits together like puzzle pieces. Make sure to put bees wax on the segments to protect the wood.

Now on to the belt for the dragon tail. To create a base for the tail, we used cardboard and high grade duct tape. An earlier build with standard duct tape did not last very long. First cut out a piece of cardboard about 5 by 8 to help guide you as you “weave” the duct tape. The cardboard does not provide any real support but just helps you remember the shape. The bigger the base, the more stable the tail will be.

Weave strips of duct tape alternating between vertical and horizontal directions. You want to use several layer, enough that it can support the tail.

Next careful cut four slits in the base for the belts. We recommend two belts but one top belt can work depending on your custom. We used camping stapes for the belts with fast release clips to making taking the tail on and off easy. Here is another design that we borrowed element from.

Next punch two holes in the base for the bolts to secure the L-braces. The L-braces will attach the tail to the belt. Use big washers when attaching the L-braces to prevent them from twisting into the duct-tape.

Now, attached the tail using four wood screws. Use small screw and drill guide holes; you do not want to split the wood.

Top view of a cosplay, wooden, flexible tail.

Finally, add two rubber bands at the base to give it some life and your tail is ready to be flaunted!

Back of a cosplay, wooden, flexible tail.

Here is a back view showing how the base looks when completed.

Two cosplay, wooden, flexible tails side by side.

Here are both dragon tails completed!

Happy Creating!

Carved Wooden Seals

March 28, 2024October 14, 2024 Lutin

As presents for our teachers last year, we decided to make a series of wooden seals. We chose cats because of their iconic shape, and because of our own cat. We prefer using a Japanese saw because it gives us a clean cut and is much easier to use.

Please note, that this material is provided for informational purposes only and is not a guide on how to create the designs. Please read our disclaimer.

To get the basic cat shape we do rough cuts with the saw, then use a craving tool to clean up the edges. The make sure the vice does not cut into the wood we used scrape from an old pair of jeans.

To get the ears we need to create a negative space between the slanted edges we just cut. The do this we first cut several slots making sure to stop just short of the end of the slanted edge. You do not want got beyond that point or the ears will more like bunny ears than cat ears.

You want to have several slots cut to to make removing them easy. If the slots are too thick when you try to pop them out (the next step you could instead break off the ears.

Once we have cut the slots we use a chisel to pop them off. Make sure to go slow and start with the center slot. When you pop off the ones next to the ears make sure to have the flat edge of the chisel pointed towards the ear. Most of the time this works like a charm but sometimes the wood refuse to cooperate. If this happens to you try you best then try using other tools like a flat head screw driver. Worst case use the chisel to cut the out and if nothing works just start over.

Then we used the chisel to clean up the rough parts between the ears. Two of the seals in this batch had slots that broke off half way making the clean up job a bit hard. Go slot and do not use force. If the chisel is sticking it is either at the wrong angle or you are trying to carve out too much in one go.

We use a rasp to finish it out. You can use sand paper as well but we like how you can shape thing with a rasp.

Next we used a spoke shave to round the edges of the square dowel to make it more cat-like. Again, do not force the tool. Just use a gentile motion while applied light pressure. If you use too much force you can cut into the wood.

Then sand to get the finished look. Remember to take the time to sand it right. After all the work it took to get here you do not want to spoil it by not having a clean surface for painting.

For a finishing touch we made a cut all the way around the seal to create a neck for the cat, We made sure the cut was not too deep and went evenly all the way around the body.

We then used a craving tool to widened the curve being careful not to cut too much out.

Here is a line up of all six seals ready for painting!

For each wooden seal we picked three different colors to create a unique theme. We used acrylic paint for these seals but you can us wood stain or oil paint if you prefer.

This one reminded us of lava!

We painted the layers over time to make sure each color stood out and did not blend in with the rest too much.

All six seals with their paint jobs finished!

The seal for the wooden seals was made of an eraser. We used wood carving tools to engrave them. Make sure you do a reverse image of what you want printed!

Here are the seals bases with their wooden carvings.

We attached the eraser to the wooden seal using hot glue. Make sure to score the bottom of the wood seal and the eraser so you get a strong bound.

Happy Creating!

Wooden Pony Carving

March 26, 2024October 14, 2024 Lutin

Our pony carving was inspired by Pinkie Pie from My Little Pony. We love Pinkie Pie’s bright outlook and humor! When we found a scrape of bright colored faux fur in our recycled fabric box, we all thought of her right away.

Please note, that this material is provided for informational purposes only and is not a guide on how to create the designs. Please read our disclaimer.

We used balsa wood for the body and faux fur for the mane. It took a while to carve since ponies have a specific body shape. We first drew the basic outline on the balsa wood then cut out the rough shape with a saw. To make sure we did not damage the wood we wrapped it in leather when it was in the vice. Then we used wood carving tools and sand paper to finish the shape. The head was the hardest part to get right. Ponies have a very specific look to them. We used a wood carving tool with a groove to get the fur just right.

Carved toy pony

The mane was stapled on to the body then pulled over to cover up the staples. To give it a bright color we used a red wood dye. The dye also showed off the pony’s carved fur.

Wooden little pony

After a quick comb our little pony carving was ready to roam the world!

Happy creating!

Foam-Mo Creations

December 16, 2023October 14, 2024 Lutin

This is an introduction to one of our favorite making materials, Foam-Mo. Foam-Mo is really great for making models of organic stuff, such as plants and animals, whereas regular air-dry clay has the wrong texture. The Hand of Glory, from one of our other posts, was also made out of Foam-Mo.

Please note, this material is provided for informational purposes only and is not a guide on how to create the designs. Please take a look at our disclaimer.

Foam-Mo

This is what Foam-Mo looks like when it’s packaged. If you want to work with Foam-Mo, you should also get some plastic spray, because without the plastic spray Foam-Mo can disintegrate over time.

Foam-Mo creation

Here are some of the small designs that we made. Like we said earlier, Foam-Mo works well with organic stuff. It is really soft, and moldable, and not sticky at all. You should not add water, because water can damage your creation, causing them to crumble. While working with Foam-Mo, we used some of the same techniques that you would use for regular clay to mold it.
Foam-Mo creation

Here are some more animals that we did, two small snakes. Foam-mo can be rolled really thin, but it holds the same risk as air-dry clay when it it thin. As it is very soft, it also might need supports while it is drying. For this project, we had to prop up the heads to prevent drooping.

Foam-Mo creation

This is what it looks like after is is sprayed with plastic. Make sure to do multiple layers, and get every part of the clay. Make sure to spray it AFTER the clay has finished drying.

Foam-Mo creation

Here is a cat that we sprayed and painted next to one that we didn’t. The cat that didn’t get sprayed looks droopy, and has the wrong texture, due to the fact that we left it unsprayed for over a year, and it started disintegrating.

Foam-Mo creation

Here are two projects that we finished spraying and painting. The colors show up pretty bright, even though the plastic spray was black. We did multiple layers for some of them, but I think that the paint worked pretty well. We used acrylic paint, but you can research and find your own paint.

Happy creating!

DIY Moss Terrarium

November 17, 2023October 14, 2024 Lutin

What do you do if you break a pot? This fun DIY moss terrarium will teach you a great way to decorate your space with recyclable materials! It will brighten up your space and help you avoid throwing away useful pottery!

Please note, this material is provided for informational purposes only and is not a guide on how to create the designs. Please read our disclaimer.

Let’s make a moss terrarium! The first step is to pack in as much mud as you can without the mud falling off. You can press in flat shaped rocks for stairs and platforms, then put more mud on top of it for more support. To create stairs, find similar sized rocks and stack them on top of each other, with space in front of it.

Here is what it first looks like after you attach the platforms. We used slate as our rock, because it is very flat. We also put some rocks along the side of the pot to look like the side of a cliff.

Use a paintbrush and water to clean mud off of the rocks and the front edge of the pot so it doesn’t look too dirty.

Next, before the mud dries, walk around outside to gather mosses and small plants. Gently tear the moss to the right size and press it into the mud. More is more, so put moss on every available surface to make it look more like a forest. If the soil is too dry, or not sticking, slowly add water in small amounts.

For the small plants, poke a small hole and press it in. Put more moss over the exposed soil around it and press. If it is too small, first make a ball of mud around the roots of the plant and then press it in.

Gently water all of the plants with a mister or with your finger. Do not dump too much water all at once or you will kill your small plants and/or sweep away the rocks and mud.

You can also add some small decorations on the terrarium to create a landscape or a scene. Make sure to water it regularly! But if your plants die, you can use the same method to replace them!

Happy creating!

SF Zoo Fundraiser Jewelry

October 7, 2023October 14, 2024 Lutin

jfheTo support the San Francisco Zoo, the HipMonsters’ sisters team, and a neighborhood friend decided to sell jewelry to raise money and awareness. Their efforts were a great success, raising nearly 400 dollars in two days of work, thanks to the generous and kind people of San Francisco.

Here is a selection of just some of the fundraiser jewelry sold! The jewelry is made with molding clay and painted with acrylic paint.

Thanks again to our neighbor friend and all the kind people who donated!

Happy creating!

Making of Number Six and Number Seven

October 7, 2023November 15, 2023 Lutin

After finishing Number three, we wanted to make smaller and lighter walking robots. Leveraging what we had learned from building our first walking robot, we made two mini robots, Number Six and Number Seven!

Please note, this material is provided for informational purposes only and is not a guide on how to create the designs. Please read our disclaimer.

Because we had a completed robot design it was easy to make sure we had all the parts we needed before beginning. Since Number Six and Number Seven were smaller we were able to spend about the same amount of money but use lighter steal parts. We hoped the reduced weight would make for better walking performance.

making a robot

The steal tubes also had bolt threads as apposed to pipe threads. Pipe threads are “V” shaped which made it difficult to get a piece tightened pointing the correct direction. With bolt threads we could use a nuts to tighten the connection between the tube and the pivot joints however they were positioned.

Working as a team the assembling went fast and in less than a day we had the beginnings of two robot. One trick we have learned is to use the floor as an assembling space. We are cramped for space and using step stools can be tricky in a workshop so the floor tends to be safer.

Here is a completed frame. It cannot stand yet and has to be held up. Here we had the initial knee designs. The knee design was important when we were developing the first walker. Later we switched to a tube in the piston rod that acted more like a spring to prevent the leg from over extending. What is critical in our approached is letting the robot fall forward but stop the fall before the robot is in a position it cannot recover from. The sister team learned this trick from a class at school where the teacher said when humans walk forward it is more like a controlled fall.

Now we start on installing the air pistons. We had to repeat this process many time because we kept switching around to position of the pistons and the direction of the air tube couplings. If the pistons are not the same on both side the robot will veer to one side and if the coupling are facing apposing ways the tubing becomes impossible to arrange. We have found facing the coupling up is typically the best orientation.

We did have to modify the piston attachment by removing the peg. This did require a parent’s help as the clip that secured the peg was difficult to remove without breaking it.

Next we began attaching the pneumatic air tubes. When measuring make sure to know were the pneumatic solenoid valve will be attached and account for the full movement of the legs. It is best to do one tube, test it, then do the opposites side. We found as we added tubes we had to change the initial lay of of the tubes. The tube work is a bit of an art form much like wiring a control unit.

Here is a close up of the all the piston installed.

Here is another view of the tubing being fitted and a close up of the pneumatic solenoid valve. Make sure to do clean, straight cuts with a sharp scissors to assure not leakage when attaching to the couplings.

Here is a front view of a completed design for Number Six and Number Seven. For testing we used a leather book strap so we could reposition the components as needed. We also tested a number of different air pumps. This pump, which we did not use in the final design, was the quietest and used the least amount of power. Latter, we switched to another model because this model kept shutting off after prolonged use.

Like with other designed we used a garage door remote controller because it reverse polarity to the pneumatic solenoid valve which switches the air flow from one leg to the other enabling the robot to walk. It is the small black box in the center of the robot.

The battery we secure to the underside for protection (the light blue box under Number Six). Instead of doing lead acid battery for Number Six and Number seven, we switched to a 12V 6Ah Lithium Iron Phosphate Battery from our lead-acid battery due to it much lighter weight and increased amps.

Here is Number Six walking in our yard.

Here is Number Seven walking in our workshop.

Steampunk DIY walking robots

And here we have all three robots, Number Five, Number Six, and Number Seven going for a walk together! The larger robot is Number Three. Number Seven is in front and Number Six is on the left.

Happy creating!

Making Mandrake Roots

September 10, 2023October 14, 2024 Lutin

Inspired by the character Professor Sprout (from Harry Potter) and this wonderful article, we set out to make our mandrake root for Halloween.

Please note, this material is provided for informational purposes only and is not a guide on how to create the designs. Please read our disclaimer.

Mandrake roots are a mythical plant that has a root that looks like a person. They scream when they get pulled out of the ground, and hearing the screams can knock you out, or even kill you. They are featured in Harry Potter, but were invented before that. For more information, go to the article above.

For our mandrake roots, we used a type of foam-like clay called Foam-Mo. Foam-mo is really useful for making organic details like plants and animals. It air-drys and can be painted, but has to be sprayed with a plastic spray, or else it will disintegrate. We recommend using several layers of the under-coat spray for maximum protection. We painted the mandrakes with acrylic paint.

DIY mandrake root

Make sure to use a nonporous surface for a build table or the Foam-Mo will stick to it once it dries. We used old cutting boards.

To make the mandrakes, we made ovals for the head and body, and tubes for the legs. We also rolled out thinner tubes for the tree branches and flattened small diamond shapes for the leaves. We used a pencil to made the lines in the leaves and to make the eyes, lines on the body, and the mouth. Remember, no two mandrakes are the same, so make them all slightly different.

Foam-mo is pretty delicate, so we needed to be careful when attaching stuff. To make it hold it’s shape, we used stuff to prop up the mandrake roots while they were drying. to make the edged look like roots, we gently pulled out thin strands of Foam-Mo at the end of all of the limbs.

After the Foam-Mo dries, we sprayed it with a plastic spray and painted it with acrylic paint. We painted them all slightly different shades of brown and green.

Please DO NOT water your mandrake, even if they tell you to! They are definitely not waterproof.

Happy creating!

Upgrades to Number Three

July 15, 2023October 14, 2024 Lutin

Since we discovered how to make Number Five move, we decided to upgrade Number Three. We tried to preserve as much of the original design as possible, so we didn’t mess with the decorations or redesign the frame. We also made the legs stronger so the robot could support itself easily and won’t fall. Professor Brockenhoff was very pleased with being able to more effectively scare strangers!

Please note, this material is provided for informational and fun purposes only and is not a guide on how to create the designs. Please read our disclaimer.

We started off by disassembling Number Three. Given how Number Three was designed as a framework, it was pretty easy to take apart.

Number Three’s Arm being Upgraded

We wanted to upgrade Number Three to make it move. Since walking with two legs is incredibly hard, we decided to only make the arms and hands move. We first used hinges to upgrade the hands so that they could open and close. Next, we had to replace the fixed joints with movable joints. Borrowing from extra part from Number Five, we added flexible joints for pipes to power a air brush. The added weight of the metal join required use adding more support for the legs. We tried plastic joints, but they failed durning testing.

Then we attached lightweight linear actuators to the joints to move them. Given we wanted more controlled movement and a quieter robot for our front parlor, we opted for electronic verse pneumatic power. We attached the linear actuators so that when they extended, the arms reached out and when they pull back, the arms bent.

And finally, for controls, we used a remote control unit for garage doors. Since we need the polarity to switch (the wires reverse, positive/negative to negative/positive) to have the linear actuators go in and out we had to make sure the control unit reversed the polarity not just turned the power off and on.

And now you see the update Number Three testing its arms with Professor Brockenhoff at the controls!

Happy Creating!