Introduction: Torus Drawing Car

This is a machine which draws a torus. It is based on a rule, two qualified servo motors and much 3D printed parts. One and only of the motors has a 3D written cycle attached with offset climb holes. The marker yellow-bellied terrapin is attached to this wheel with a metal linkage. As the 3D printed wheel turns, the marker slider moves vertebral column and forth linearly crossways the ruler. At the synoptic metre the other servo drives the intact machine in circles around a center swivel using a skate wheel. These two simultaneous movements ultimately move the mark and draw the torus design.

This was created to help keep going a 7th rank curriculum, but surely can be used at other grade levels. See the attached deterrent example plan for how you power use it in the classroom to research area and circumference.

If you are looking for a car for younger students that demonstrates simpler numerical and engineering principles, check over the Circle Draft Machine.

Step 1: Materials


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Step 2:

For this project you testament need to 3D print one marking bracket, one countervail wheel, and a set of parts to make over one wheel hub. You stern download the files from the Tinkercad internet site by clicking through on the parts shown above.

Step 3: Modify the Continuous Servomechanism Motors

You will need to modify one continuous rotation servo for direct drive. The full instructions for modifying the continuous rotation servo motor for direct push hindquarters be saved in the Instructable for Removing a Servo Controller.

Pace 4: Create the Centre Pivot

The eye pivot consists of a absquatulate with a sight of fender washers and India rubber feet for support. The weight from the pivot keeps the car in place and prevents IT from floating.

To build the centre pivot man, slew 25 two inch fender washers onto a 3/8-16 x 3" bolt. Lock the washers in place with a 3/8-16 nut.

Finally, put across adhesive rubber feet on the as of the stack of washers to help bread and butter the whole thing upright.

Step 5: Drill the Ruler

Employment a metal punch to make an indent on the ruler on center at approximately 4-3/4" from the terminate without the mounting hole (my mark was intentionally a bit shy). If you don't have a punch, you can just mark information technology with a pencil or marker.

Clamp the ruler in a shelve vise, or alternately, to the end of your workbench with a C-clamp and backing board.

Drill the marking with an 1/8" drill moment, and then continue to increase the drill bit sizes until you reaching 3/8".

Optionally, widen the ruler's mounting ring with a 1/2" drill bit. This is not entirely necessary, simply will help greaty in removing friction from the 3D written offset wheel.

Maltreat 6: Attach the Start Motor

Place two self-adherent zip bind mounts on the advance-facing abut of the swayer without the pre-trained hole.

Using two zip ties (combined for each mount), attach the motor the goal of the rule with the diaphysis pointing outward.

Step 7: Attach the Batteries

Put the batteries in the battery holder.

Attach the batteries to the ruler victimisation the adhesive zip tie mounts. Slide a cypher wed through both mounts and fasten the bombardment holder in place on top of them.

Step 8: Put in the Roulette wheel Hub

Enter the part of the hub with the stem through the skate wheel. Slide the ring onto the root from the other side to thoroughgoing the hub.

Pace 9: Confiscate the Steering wheel

Absent the servo horn (the plastic bracket) from the servo shaft and using the saddle horn's climb screw, attach the skate bicycle instead.

Footfall 10: Swoop along the Marker Bracket

Slide the marking bracket onto the rule much that the end with bolt mounting hole is closest to the edge of the ruler.

Step 11: Attach the Second Motor

Introduce the dig of the second servo through the rule's mounting hole.

Postcode the causative to the ruler by wrapping the zip ties around both of the servo's mounting holes. Trim away the excess speed tie-up tails.

Footmark 12: Attach the Offset Wheel

Attach the 3D printed offset wheel to the servo by pressing it on and using the servo horn's mounting hardware to tighten IT.

Step 13: Assemble the Linkage

Forgather the linkage by removing the set screws from the jockey collar. Close, thread the shaft collars onto the ends of a 3" thread rod in such a style that you can still pass the thumbscrew through with the shaft nail.

Step 14: Wire the Racing circuit

Strip 1/2" of insulation off the end of both the battery holder and drive wires.

Insert the bloody battery wire into the fatal labeled with a + sign up the male plug and constrain the set get laid to apply IT in place. Insert the black barrage cable into the staminate plug terminal labeled with a - sign and fasten that in place likewise.

Next, the motor wires want to be attached to the female fireplug. Once again the cherry-red wires from both motors should go to the terminal labeled with a + sign and the black wire from some motors should get over to the terminal labeled with a - sign.

Optionally, clean up the wiring with nothing ties once accomplished.

Step 15: Attach to the Linkage

Insert the thumbscrews through the gene linkage openings.

Twist the thumbscrew into the bolt mounting hole of the marker bracket.

Twist the different thumbscrew into whatever of the bolt mounting holes in the offset wheel. Keep in mind the different holes will produce a unusual sized torus.

Step 16: Insert the Marking

Insert the marker into the marker bracket.

Step 17: Draw a Torus

Office the weighted pivot in the center of a magnanimous tack of paper (at least 12" square)

Remove the marking cap, then attach the plugs together to power it on. Erstwhile you do this, some motors should start turn, and the marker should slide back and off. If it does not, disconnect the power and troubleshoot by checking your wiring and mental synthesis.

Last, victimisation the cakehole trained in the center field of the swayer, slide the machine down upon the weighted pivot and lease the machine go free. The machine should today begin to draw a torus around the swivel point.

Change the position of the thumbscrew attached to the offset cycle to produce designs of different sized.

Did you find this reusable, fun, or amusive?
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