Introduction: Circle Draftsmanship Machine

This is a basic drawing off machine that creates circles. It is based on a ruler and a 3D printed marker slider. The machine pulls the marker around a adjusted center pivot to create a circle. By repositioning the mark along the length of the ruler you can draw circles of contrary sizes.

This was created to helper support a 5th grade curriculum, only sure can be old at other grade levels. See the pledged object lesson plan for how you might use it in the classroom to research mensuration.

If you are looking a machine for older students that demonstrates more complex mathematical and engineering principles, fit out the Toroid Drawing Auto.

Step 1: Materials

Step 2: 3D Printed Parts

For this project you will need to 3D print marker bracket out, and a set of parts to make one wheel hub. You can download the files from the Tinkercad internet site by clicking done on the parts shown above.

Step 3: Modify the Continuous Servo Motors

You will need to modify unrivaled continuous rotation servo for through drive. The full instructions for modifying the continuous rotation servo centrifugal for no-nonsense drive can be found in the Instructable for Removing a Servomechanical Controller.

Step 4: Create the Center Pivot man

The center pivot consists of a deadbolt with a stack of fender washers and rubber feet for support. The weight from the pin keeps the machine in place and prevents it from drifting.

To build the pore pivot man, slide 25 ii in fender washers onto a 3/8-16 x 3" bolt. Lock the washers in situ with a 3/8-16 junkie.

Finally, place adhesive rubber feet happening the bottom of the sight of washers to help keep the gross affair upright.

Step 5: Attach the Motor

Place cardinal self-adhesive zip tie mounts on the front-facing edge of the ruler without the pre-drilled hole.

Victimization two zip ties (one for all mount), attach the motor the end of the ruler with the shaft pointing outward.

Step 6: Attach to the Batteries

Put the batteries in the electric battery holder.

Attach the batteries to the ruler victimization the adhesive zip tie mounts. Slide a zip tie through some mounts and fasten the battery holder in situ on superlative of them.

Pace 7: Insert the Wheel Hub

Insert the part of the hub with the stem done the skate wheel. Slide the ring onto the stem from the early side to complete the hub.

Step 8: Attach the Wheel

Remove the servo horn (the plastic bracket) from the servo lance and using the horn's mounting screw, attach the skate roll instead.

Step 9: Telegram the Circuit

Strip 1/2" of insulation off the close of both the battery holder and motor wires.

Stick in the cherry battery wire into the time period labeled with a + contract the plug and reduce the put up screw to hold information technology in place. Insert the dim battery conducting wire into the male stop up period of time labeled with a - sign and fasten that in place every bit well.

Next, the motor wires need to be attached to the female plug. At one time once more the red cable should go to the terminal labeled with a + sign and the black cable should go to the terminal labeled with a - sign.

Step 10: Slide on the Marker Bracket

Slide the marker bracket onto the end of the swayer of which the motor is non involved. It should easily slide right.

Step 11: Slip in the Marking

Insert the Sharpy marking into the kettle of fish on the marker slider.

Step 12: Draw Your First Roundabout

Place the weighted pivot in the center of a humongous sheet (leastwise 12" square)

Position the marker 5" from the free edge of the rule.

Next, attach the plugs in collaboration to power it on. Once you do this, the wheel should start turning. If it does not, check your wiring and sample again.

At length, using the rule's supported tab, slide by it down upon the weighted pivot and let the car go free. The machine should now draw a perfect circle approximately the pivot point.

Step 13: Make a Donut

Today that you experience made one circle , let's try fashioning some other one!

Lift the machine so that the roulette wheel is not making contact with the ground, slew the marker so that it is non 3" from the border of the ruler, and and so put down it chicken out along the pivot. It should straight off draw a smaller lot at bottom of the larger one.

You should beryllium left with something that looks like a sinker. You can now hold back experimenting and drawing more circles or quit while you are ahead and decorate your sinker by adding toppings and food color it in.

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