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Liquid Fuel Pump for RC Cars: Simple Principal Yet Elaborate! (Guts Complete, Housing being Made! - Part 1 of 2)

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Firstly i must thank everyone who has already made a liquid pump like this here on instructables because that is where i got the idea from to make my own, so a mojor thanks to all who have already made the simple versions of this, if it wasn't for you, i wouldn't had been able to make this monstrosity !

Oh and this is my 1st Instructable so go easy on me, naturally constructive criticism is welcomed but if your just here to merely prod & belittle, then i suggest you keep yourself to yourself !

I really tired to make this a very simple design but because i had modeled this around the motor & plate from the cd-rom drive, it turned out to be getting slightly complicated here and there!

But never-the-less, here are the Guts to my RC Nitro Car Fuel-Tank Fill & Empty Fuel Pump !

Call This instructable my Fuel Fill & Empty Pump (GUTS!) Part-1 !!!

It all works as advertised, the fins move clockwise with Button 1 and they move anti-clockwise when released Button 1 and pressed Button 2, so i know that all the electrics work !

 This is however an experimental design and it will also matter greatly on the housing and tubes' placement so watch this space for i am currently working on the housing !

-WARNING-

(This is intended Not to be Offensive OR Rude in anyway, Constructive Criticisms Welcomed here...)

ANYONE PAINTING: WITH AEROSOL SPRAY-PAINT MUST ALWAYS USE IN A WELL VENTILATED AREA AND ALSO USE A FACE-MASK AS EXTRA PROTECTION - ALSO ADD A GOOD DOSE OF COMMON~SENSE OR IF UNDERAGE YOU MUST ALWAYS HAVE AN ADULT WITH YOU TO SUPERVISE AS MUCH SAFETY PRECAUTIONS ARE BEING MET IN THE STRICTEST OF CIRCUMSTANCES. - I ACCEPT NO RESPONSIBILITY FOR ANYONE NOT FOLLOWING THE GENERAL RULES PRINTED ON ANY SPRAY-PAINT-CANS.

ANYONE USING POWER~TOOLS: MUST ALWAYS USE IN A WELL VENTILATED AREA AND ALSO USE A FACE-MASK AND EYE PROTECTION AS EXTRA PROTECTION - ALSO ADD A GOOD DOSE OF COMMON~SENSEOR IF UNDERAGE YOU MUST ALWAYS HAVE AN ADULT WITH YOU TO SUPERVISE AS MUCH SAFETY PRECAUTIONS ARE BEING MET IN THE STRICTEST OF CIRCUMSTANCES. - I ACCEPT NO RESPONSIBILITY FOR ANYONE NOT FOLLOWING THE GENERAL RULES SUPPLIED WITH THEIR POWER-TOOLS.

ANYONE USING ANY GLUE OF ANY~KIND: MUST ALWAYS USE IN A WELL VENTILATED AREA AND ALSO USE A FACE-MASK AS EXTRA PROTECTION - ALSO ADD A GOOD DOSE OF COMMON~SENSEOR IF UNDERAGE YOU MUST ALWAYS HAVE AN ADULT WITH YOU TO SUPERVISE AS MUCH SAFETY PRECAUTIONS ARE BEING MET IN THE STRICTEST OF CIRCUMSTANCES. - I ACCEPT NO RESPONSIBILITY FOR ANYONE NOT FOLLOWING THE GENERAL RULES SUPPLIED WITH ANY GLUE IN ANYONE'S POSSESSION.

Basically USE a Good-Supply of Common-Sense but if you're Running-Low, have a Friend or Three come and help you out !!!
 
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MCRIPPPer2 years ago
another easy way to get bidirectional motor operation is to use a dpdt (double pole, double throw) switch. you can use it to basically make a mechanical Hbridge.
then just add a pushbutton inline as an "enable" switch.
offtherails2010 (author)  MCRIPPPer2 years ago
AWESOME !

Many thanks mcrippper, i'll be using this method very soon, as whatever i make for my car, i make another for a friend so his fuel pump will be employing the DPDT switch !

Again many thanks !
soshimo2 years ago
You can drive the motor both ways with a single battery, but what you need is called an h-bridge circuit. This is a circuit that uses transistors to control current flow to the motor. It controls the amount of current and the currents direction across the winding which control speed and direction of the motor.
offtherails2010 (author)  soshimo2 years ago
A Major Thank you soshimo !

I cannot thank you enough, after all the time i spent looking for a way to solve my problem of just using one battery to power the pump for dual-direction motor spin, i also registered with a specialized electronic forum which was a complete waste of time because whoever got back to me on the forum wanted me to 'buy' the solution from them or whatever they advised me on made absolutely no sense!

Again, a MAJOR thanks for the assist !!

;-)
No problem at all, that's what we are all here for - to share. Forget those corporate monkeys who tried to "sell" you a solution.

By the way, to make your job easier there are several chips (many DIP for prototyping) available which will give you your H-Bridge circuit. Just drop in an IC and a couple of supporting components and you have a motor driver. Two are the SN754410NE and SN754410NE which are both Quad H-Bridge drivers that can control two DC motors in both directions or one stepper motor.

Normally applications using this chip show you how to use it with a microprocessor, but you can also supply +5vdc directly to the control pins (via your switch) to control the direction of the motor.

Check out this link: http://letsmakerobots.com/node/2074

Happy Hacking!
soshimo soshimo2 years ago
The two chips are SN754410NE and L293D.
How soon do you think you can post the finished pump housing so it is fully finished and ready to pump? I've been looking for a small pump for a micro aquarium I just set up, I'd just have to change the fins to plastic and coat the shaft with glue to prevent rusting and it would be perfect.
Hi scottrevoman333 & thanks for the interest!

i think your use of this pump will be excellent for moving liquid in an aquarium, i also stumbled upon an article for how to waterproof motors (below) just in case you need to take steps to waterproof a motor to be used underwater...

How to waterproof a motor

Unfortunately ive really-overdone-it the last 2 weeks and am paying for it now! resting at the moment as ive over-exerted myself and it'll take a good few days to recover! (advanced Arthritis doesnt help!) But i aim to have the housing for this pump finished within the next two weeks and ready for use to pump liquid of any sort (the waterproofing 'stuff' mentioned in the instructable like the liquid rubber for example, has excellent resistive properties to chemicals and  water, if you like & for peace of mind, the Plasti-Dip can be used to 'dunk' motors into to give a good waterproofing coating effectively !) but make sure you dont get any onto the motor shaft's bearing! 
lemonie2 years ago
Nice bit of work there, but if I read it right it's not finished for moving liquid yet?

L
offtherails2010 (author)  lemonie2 years ago
Many thanks lemonie!

Thats right, i made sure the title of this project made everyone aware of this!
rimar20002 years ago
Good work!
offtherails2010 (author)  rimar20002 years ago
Many thanks - its most-appreciated !