Model Engine Maker

Engines => Your Own Design => Topic started by: TobyTetzy on September 28, 2018, 09:55:14 PM

Title: Spring Powered Toy Car
Post by: TobyTetzy on September 28, 2018, 09:55:14 PM
Hello,

I've found a nice Toy Car here.

https://www.pamono.de/limited-edition-toy-car-von-wouter-scheublin (https://www.pamono.de/limited-edition-toy-car-von-wouter-scheublin)

https://www.scheublinlindeman.nl/toy-car.html (https://www.scheublinlindeman.nl/toy-car.html)

But the price isn't mine  :o so I've design my own toy car.
I used some other spur gears in Modul 1.
Original are some 9 teeth used, I've taken 10 teeth because I don't found any 9 teeht spur gears.

Regards Toby
Title: Re: Spring Powered Toy Car
Post by: crueby on September 28, 2018, 10:23:27 PM
Very clever mechanism, pull back to wind means no ratchet or key. Looking forward to seeing it built!
Title: Re: Spring Powered Toy Car
Post by: b.lindsey on September 28, 2018, 11:41:55 PM
Wow, pricey little thing isn't it? Clever yes, could be built for far less than that asking price.

Bill
Title: Re: Spring Powered Toy Car
Post by: zeeprogrammer on September 29, 2018, 12:27:22 AM
Very neat! That would make a fine gift.
Title: Re: Spring Powered Toy Car
Post by: Kim on September 29, 2018, 12:38:34 AM
Very cool Toby! If you decide to share those plans, I'd be interested! :)
Kim
Title: Re: Spring Powered Toy Car
Post by: TobyTetzy on October 02, 2018, 10:28:45 AM
Hello,

I tried to print a prototype 3D.
Unfortunately, the model with Modul 1 gears has become very small.
At the moment I'm printing a model 1.5 times bigger, so with module 1.5 gears.
I think it will have such a bigger size.
Here's my quick and dirty drawings.
If dimensions are missing, just ask.

Since I created the model in 3D CAD, the 3D files and DXF files can be offered on request.

Now I'll see if I get the model 3D printed and mounted.

Greetings Toby
Title: Re: Spring Powered Toy Car
Post by: TobyTetzy on October 02, 2018, 02:43:12 PM

Hello,

Unfortunately I found a small mistake.
The chassis middle is too long at the back. It hits the small pinion.

Correction attached.

Greetings Toby
Title: Re: Spring Powered Toy Car
Post by: crueby on October 02, 2018, 03:19:20 PM
Very ingenious setup, looking forward to seeing yours come together!
 :popcorn: :popcorn: :popcorn:
Title: Re: Spring Powered Toy Car
Post by: ddmckee54 on October 02, 2018, 08:14:22 PM
Toby:

If you're thinking about 3D printing the coil spring too, I wouldn't recommend it.  I found out while working on my rubber band gun that 3D springs aren't all that "springy".  If you make them thin enough to flex like you think they need to, then the spring is too soft.  If you make them thick enough to provide the required spring action, they won't flex too many times before they break.  Maybe if you were printing in nylon they might work, they definitely won't work with PLA and probably not with ABS either.

Don
Title: Re: Spring Powered Toy Car
Post by: TobyTetzy on October 04, 2018, 10:39:28 AM
Hello,

I finished my first prototype.
It actually works pretty well.
The printed parts are not so accurate, I had to work a lot.


Here is a video of the function.

http://www.youtube.com/watch?v=OXfN_q-NyT8

Greeting Toby
Title: Re: Spring Powered Toy Car
Post by: Ye-Ole Steam Dude on October 04, 2018, 11:12:04 AM
Hello Toby,

Your video does not show up.

Your prototype looks good in the photos.

Have a great day,
Thomas
Title: Re: Spring Powered Toy Car
Post by: Admiral_dk on October 04, 2018, 11:52:26 AM
Great little toy  :whoohoo:

The video shows in Chrome but not in IE - a problem seen before here, haven't got a clue, but seems to remember that they discovered that it is a question about how you add the video here.

Best wishes

Per
Title: Re: Spring Powered Toy Car
Post by: TobyTetzy on October 04, 2018, 01:47:09 PM
Hello,

for all IE users, here ist the Youtube link. Hope it works.

https://www.youtube.com/watch?v=OXfN_q-NyT8 (https://www.youtube.com/watch?v=OXfN_q-NyT8)

Regards Toby
Title: Re: Spring Powered Toy Car
Post by: Ye-Ole Steam Dude on October 04, 2018, 02:03:20 PM
Yep, the YouTube video works OK.

Have a great day,
Thomas
Title: Re: Spring Powered Toy Car
Post by: b.lindsey on October 04, 2018, 02:22:36 PM
Great little project Toby!  So are you going to make it in metal now?  BTW, the video worked for me....Windows10 and Edge.

Bil
Title: Re: Spring Powered Toy Car
Post by: ddmckee54 on October 04, 2018, 06:12:03 PM
Toby:

When you printed the parts, what layer thickness did you use?  What sort of tolerances were you using between parts?

I normally print at 0.2mm layer thickness.  This is my compromise between print quality and print time.  I've had to do a lot of playing around with my printed parts but I've found the following tolerances to work for me and my printer:
Less than +0.1mm gives me a very "tight" press fit, almost impossible to use.  Once you mash the parts together, if you can, they are NOT coming apart without a fight.
+0.1mm to +0.2mm will give me a press fit, with +0.2 being a "light" press fit.  The parts will go together with finger pressure and they will come apart without an argument.
I use +0.3mm and above for parts that I want to fit together and move.

3D printing, at least the FDM/FFM processes normally used, is kind of a "sloppy" procedure.  Printing in layers as we do, this can't be helped.  You CAN'T print an absolutely flat side no matter how hard you try.  Under magnification it's still going to look like the side of a log cabin.  It can be minimized, but it can't be eliminated.

Hope this helps.
Don
Title: Re: Spring Powered Toy Car
Post by: TobyTetzy on October 05, 2018, 10:11:36 AM
Hello,

yes, it is planned to build the car out of metal.
3D printing was just a first test of whether it works in principle.

I also print in 0.2mm layer height.
I did not customize the STL file, I have e.g. insert a 6 mm shaft into a hole drilled to 6.5 mm. A 6.0 or 6.2 mm bore was still too tight.

As I said, 3D printing was just a first test of whether the model works.

Since I like the size very well with Module 1.5 gears, I will revise the model again.
The side parts and gears e.g. were 5 mm thick.
1.5 times bigger it would be 7.5 mm, the material is bad to get.
It would be better now 6 or 8 mm material.
I will also see if I get sintered metal bushes.
I would adapt the model accordingly.

Greeting Toby