Using a TINY 96 GW Motor for Electric Pencil Sharpener

Discussion in 'General Electronics Chat' started by -live wire-, Feb 3, 2019.

  1. -live wire-

    Thread Starter Active Member

    Dec 22, 2017
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    This 6V, 16GA* motor, is less than one inch long!
    https://www.amazon.com/uxcell-600RP...&qid=1549244434&sr=8-1&keywords=6v+16ga+motor
    Does anyone have any ideas how they created such a small but powerful motor?

    Actually though, I am trying to electrify a pencil sharpener. However, I still need a lot of portability. I want a motor that is less than 2 inches long, spins at 600-1200 RPM, and is around 10 watts. Voltage doesn't matter, as long as it is < 30V. It also must have a diameter of 1 inch or less. Suggestions? I am having difficulty finding something like this.

    *no load current. I wonder how much it is when loaded...?
     
    Last edited: Feb 3, 2019
  2. Reloadron

    Distinguished Member

    Jan 15, 2015
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    Your link goes to a fuse assortment. You may want to fix that.

    As to a motor I have seen some high torque low speed DC motors. Motors similar to this but you need the higher RPM. Most are geared as in the link and that can afford high torque at lower RPM. You may find something in these 20 pages or so from Amazon.

    Ron
     
  3. -live wire-

    Thread Starter Active Member

    Dec 22, 2017
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    I did, just now. The thing is, most of the motors are 3+ inches, which is too long for it to be as portable as I want. If anyone knows of some motors that fit those requirements, that would be great.
     
  4. Reloadron

    Distinguished Member

    Jan 15, 2015
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    There must be something out there since a Google of "battery powered pencil sharpener" brings up plenty of them. Like you, I can't find a small motor with the speed range and torque you want.

    Ron
     
  5. Tonyr1084

    Distinguished Member

    Sep 24, 2015
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    Generally speaking - the motor is likely just a fairly common motor. What I see in the link you provide is a set of planetary gears inside that end housing that reduces the RPM output. Reducing the output by 50% means increasing the torque by 50%. If (and I have no idea how much they are) you reduce the output RPM by 80% you increase the torque by 80%. So to answer your question on how they achieve such high torque it has to do with motor speed and gear reduction.
     
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  6. -live wire-

    Thread Starter Active Member

    Dec 22, 2017
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    See - no load current: 16GA. Voltage: 6V.
     
  7. -live wire-

    Thread Starter Active Member

    Dec 22, 2017
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    The thing is, I want to make the most powerful portable pencil sharpener out there. I don't want to buy something, especially if it's underpowered. Actually, I had an idea. Are there any small 1 inch diameter 1-2 inch long BLDC drone motors out there, ideally 200-400KV? And are there small driver boards?
     
  8. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    Tim Taylor, is that you?

    You generally want some pencil left after you sharpen it, no?
     
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  9. Tonyr1084

    Distinguished Member

    Sep 24, 2015
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    Thought that myself. Only the Tool Man wouldn't' just use a more powerful electric motor he'd use a chainsaw engine or a weed-whacker engine. Maybe even a 50 cc Honda engine (if they make one).
     
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  10. shortbus

    Expert

    Sep 30, 2009
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    Not really. He's making kindling for his electric fire starter.
     
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  11. shortbus

    Expert

    Sep 30, 2009
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    16GA??? 16 Giga Amp motor?? Bringing you own reactor with you camping?
     
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  12. MisterBill2

    Distinguished Member

    Jan 23, 2018
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    I was wondering the same thing. What is the TS using "GA" to represent? Those small motors can be powerful because of speed, not torque. AND creating "the most powerful pencil sharpener" seems to ignore that there are FAR BETTER mechanical pencils that have been cheap and available for at least ten years, and not quite so cheap for 20 years before that.
     
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  13. Yaakov

    Well-Known Member

    Jan 27, 2019
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    The data sheet on the motor says it is 35mA@5V (rated supply) unloaded, so I can't find any correlation to the ratings, nor decode whatever that is supposed to mean.

    He wants to do something fun, and that's great, but I am not sure he can count on Amazon as a guide to motors.
     
  14. shortbus

    Expert

    Sep 30, 2009
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    Thread title is even worse, 16GW @ 6V. TS won't answer the question about how old he is, I've asked it before.
     
  15. MisterBill2

    Distinguished Member

    Jan 23, 2018
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    Check the profile page. It is not a kid if the data is correct.
    But the sellers information provided with the motor could be a fantasy. I saw an add for "100 WATT COMPUTER SPEAKERS" , battery powered but they also included a 12 volt 100mA wall wart supply to use instead of the batteries. At best, half the stuff posted is correct. When I search for information, ebay always comes back and claims they have it in stock, when they have no clue what it is. I do not like being lied to, but I am used to it.
     
  16. shortbus

    Expert

    Sep 30, 2009
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    Wow, that's a shocker. He is always showing pictures of stuff being built on the floor, so thought he was a school kid.
     
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  17. Reloadron

    Distinguished Member

    Jan 15, 2015
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    I can't build stuff on the floor anymore. Getting up and down is a problem and when it's on the floor the dogs believe they own it.

    Ron
     
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  18. -live wire-

    Thread Starter Active Member

    Dec 22, 2017
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    "G" is the SI prefix for a billion ("giga"). A is usually used to represent amps. The title is 96 GW, meaning 16GA*6V = 96GW (power equation). And google already has enough of my info, I don't want to put more identifying stuff out there.
     
  19. MisterBill2

    Distinguished Member

    Jan 23, 2018
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    The gearbox required to reduce the 10,000 RPM speed of this motor to the required 30RPM for a pencil sharpener will be very impressive indeed. But I suppose that it could instead spin a router bit to shave off a very small amount of wood and graphite with each rev and possibly make a good sharpener. But rotating the pencil would need to be done manually The thing would not at all look like a standard pencil sharpener, nor could the construction be at all the same. The speed reducer would only need to be a 4:1 reducer then. Much more reasonable.
     
  20. MaxHeadRoom

    Expert

    Jul 18, 2013
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    The electric one on my desk uses 4 AA cells, it has a 'standard' looking hand style sharpener that is rotated, one advantage is if the batteries are flat I just use it as a normal manual version.;)

    upload_2019-2-5_15-46-52.jpeg

    Max.
     
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