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Homemade Automatic pencil sharpener | Easy Science fair ideas

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Hello readers, wondering for new science project idea? Homemade Automatic pencil Sharpener can save you!

Well, Here i will give you amazing and easy science fair idea to make Automatic pencil sharpener at home, all the steps explained very clearly so that there no room for confusions!

Features of Homemade Automatic Pencil Sharpener

  • Very easy to make project and best part being almost every material you can find at home
  • No need of rushing into nearest superstore to get all those materials, which most of us hate!
  • Powered by normal 6v or 12v Dc power adapter
  • Sharpens pencil in matter of seconds
  • Separate slot for after sharp waste removal
  • Made from recycled materials
  • Powerful compared to its size
  • Don’t worry if you missed some of materials i have provided alternatives, Continue reading below

Note: Video link of this project tutorial provided at end, Don’t forget to check it out

materials required for this project

homemade automatic pencil sharpening machine materials
Materials for homemade automatic pencil sharpener
  1. Sharpener of own color choice
  2. DC Motor version here is 775 motor
  3. Alternatively BO Motor also any other geared motor can be used
  4. If different motor are used requirements as needed can be selected
  5. you can apply your creativity after reading this, Definitely you will be showered with ideas!
  6. 12v DC Pin for power supply, you can use normal 9v battery also
  7. Recycled soda bottle for making body alternatives are cardboard tubes or plastic pipes
  8. Hot glue and super glue for coupling things
  9. Soldering station/ soldering iron
  10. Cap part from used color pen for shaft couplings
  11. Once all supplies put together, refer below steps
making homemade automatic pencil sharpening machine
  • Start by soldering wire to DC Motor only do if pre-soldering is missing
  • Here preferred to use 775 motor which are very popular because of its silence and power comparing to cost effectiveness
  • Cut plastic bottle into half, we need both pieces for this project so don’t throw any away! save for later
  • Solder wires to 12v DC pin, this becomes our power input pin
  • Make a hole on cap, later place DC pin in position and using hot glue fill cap
  • Wait until it dries up completely

Making DC Motor couplings for sharpener

  • Using old color pen cap which should be same size as of DC Motor shaft Coupler can be made
  • Wondering what is coupler?
  • Coupler by name says that used to couple things up!
  • Cut a piece of small length from cap
  • Attach one end of coupler to Motor shaft
  • Other end will go to sharpener
  • Make sure to attach exact mid part of sharpener to avoid vibrations while working
  • Before super gluing to motor shaft some minor changes are made
finishing part of automatic sharpener making
Finishing automatic sharpener project
  • i used cap from old plastic container as cover frame
  • Recommending to avoid replacement made from cardboard or paper
  • plastic has more strength and much preferred to use plastic
  • i have made a hole which perfectly fits into DC Motor body design
  • Attach this to mainframe using mild hot glue, if glue becomes super hot it will melt and disfigure plastic!
  • Once the body becomes dry use super glue for cover frame
  • Now attach sharpener to motor shaft
  • Refer images for any references
  • at this part our project will be almost complete
  • Additionally a bin for collecting all waste made from leftover plastic (mentioned previously to save for later!)
  • Homemade automatic pencil sharpener is ready to sharp pencils superfast!

How Homemade Automatic Pencil Sharpener works?

  • DC Motor converts electrical energy into mechanical energy
  • This mechanical energy will be converted into various forms to get required work done as per applications
  • Here mechanical energy will be in form of rotational energy
  • This is exact same energy we apply while manually sharpening pencil
  • Since both becomes relatable wonderful project can be made using this principle

How to use our project

  1. Use 12v adapter to power this project
  2. Connect power pin to power slot on motor body
  3. Cover the sharpener with shield so to prevent waste from spilling out
  4. connect power adapter to power supply and switch it on
  5. Motor starts working so the sharpener begins to spin
  6. Insert pencil to sharpener via shield
  7. Pencil can sharp in matter of seconds
  8. Waste gets collected inside shield, so it can be safely transferred to dustbin
  9. Don’t keep pencil inside sharpener for too long because of high RPM, hence in no time work gets done
  10. As i observed in 4 seconds you can sharp a new pencil if same process was done manually 15 to 20 seconds would be consumes
  11. Congratulate me for saving your 15 second time and valuable physical energy


  • can be good creative idea for science fair projects or mini projects
  • Project gets done within an hour if all materials were put together
  • Eliminates repetitive task
  • solar panel can power this project
  • This is a device which runs from free energy sources
  • Less expensive (overall cost is less than 5$)
  • Leads to much more innovative ideas using DC Motor


  • Switch and speed controller can be added for much more precise speed control as having much more unused energy more than required
  • Better frame materials usage but that can lead to increase in overall cost of project
  • Small motor doesn’t have enough power to run sharpener with load
  • System doesn’t fit in pocket
  • Consumes more energy when load applied

That was all about building Homemade Automatic pencil sharpener, i hope all steps were clearly explained so that if you are building no confusions occur, if you have any let me know in comments Section.

Additionally i have provided video link for this project

Video link

Click here for Automatic pencil sharpener making tutorials

Also Don’t forget to check out my other posts related to building various other exciting science projects as well as Arduino projects, Go to menu section and get your dose for creativity!

Requesting you to show you support for this project by sharing this awesome ideas with your family and needy friends, help me in sharing such educational content across the globe, Thank you and have a good day! see you in upcoming creative project idea


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