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I reproduced Stampede ECS gears, and "hello"

I produced some gears, look at them

11 replies to this topic

#1 Sifaka

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Posted 30 December 2013 - 04:16 PM

As this forum seems to get straight to the point - "Nerf or Nothing" if you will - so will I.

Posted Image

I produced these replacement gears for the Stampede ECS after I was annoyed at both the frequency of failure, and the scarcity/cost of replacement parts.

The current batch uses a 70D urethane resin. Other materials used in the first productions failed when run with a 16 volt power supply, stock springs, and stock Stampede motor between estimated 1,000 cycles (shots) and 15,000 cycles. I have attempted to run the pictured gears to failure, they have not failed as of yet, and I would estimate over 15,000 cycles at this point. It may yield eventual failure, but at this moment it is starting to become what I would consider reliable.

I need your help.
I would like to create the perfect gears to use when modding the internals of your Stampede. Internals that are stronger, and cheaper than the stock models.

To do that we need to torture my creations.

If you are in the Orlando Florida area I would be happy to offer some free prototype gears if you wish to be a guinea-pig. If you wish me to continue my refinement of these, I may consider commissions, or donations. Demand for service will decide how I continue. I am not entertaining any offers for sale at the moment, as they may have unforeseen issues that I would not allow to sully my namesake. I have run out of project funds to try other materials currently. However, if you would like, I will offer the aforementioned "guinea-pigs" the opportunity to make donations toward other materials I would also like to try. They have better specs than ABS as far as Tensile strength, and Tensile Modulus of Elasticity on the ASTM D638 tests. Currently, I would only need 120 dollars total to try out two better plastics I had in mind. I mention this not because I need donations, but because it will expedite the process. If left to my own devises I will produce the funds, just not quickly.

If this is relevant to your interest, and you would like to arrange some method to pick up some gears to test out, feel free to contact me.
If you have any other parts you would like me to look into, I may also consider it.

I am not a huge Nerf fan (as in I do not participate in "wars"), I simply was annoyed that my 5 dollar thrift store find did not function. I liked tinkering with it, and I wanted to share my solutions.
If you are curious about where I obtained my skill set to do this; I have 8+ years experience working in special effects.


-Sifaka

P.S.

I can not reply directly to a post, as a new member I am limited to two posts a day.

To circumvent this inconvenience you may contact me via skype. The information will be posted on my user profile.

Edited by Sifaka, 30 December 2013 - 11:16 PM.

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#2 Exo

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Posted 30 December 2013 - 05:39 PM

And what spring(s) were you testing this with?
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#3 Crusher9051

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Posted 30 December 2013 - 05:46 PM

Have you tried these gears using an aftermarket spring or just used a stock spring for testing?
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#4 Sifaka

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Posted 30 December 2013 - 05:49 PM

And what spring(s) were you testing this with?


Stock.

I would be willing to test them with the higher tension springs.

Edited by Sifaka, 30 December 2013 - 05:59 PM.

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#5 roboman

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Posted 30 December 2013 - 08:00 PM

It'll be interesting to see how they hold up against higher loads. I was looking into having a run of sintered bronze or steel gears done through a manufacturer in China, but if urethane gears work with heavier springs, that would probably be significantly cheaper.

Those are some really nice results, by the way. Did you just use the typical silicone RTV mold?
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#6 Arvex

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Posted 31 December 2013 - 10:01 AM

I'd be happy to help you test them out. I just ordered a 4KG spring for my Stampede yesterday. I want to see if I can upgrade my Stampede to make it able to compete with the new Rapidstrike, so I'm going to try a voltage mod and motor swap as soon as I get a little more money.

I don't live in the Florida area (Ohio), but I would gladly cover shipping and material+time costs for you.

Adding you on Skype.

EDIT: Figure a modded Stampede like what I have planned might be a good testbed for your gears.

Edited by Arvex, 31 December 2013 - 01:32 PM.

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#7 T da B

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Posted 31 December 2013 - 05:04 PM

It makes me glad to see someone else attempting to solve the infamous Stampede gear problem. Your materials choice seems fine, but you could make a huge structural improvement--the gear with the square end that fits in the square hole should be permanently attached to its partner. That's the main point of failure in the Stampede gear system.

~T
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Make it funky.

#8 azrael

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Posted 31 December 2013 - 05:07 PM

Wow, very cool! I'm down to help test them with higher springs. I think I have around 11kg in my Stampede right now.
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#9 HasreadCoC

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Posted 01 January 2014 - 05:41 PM

Ahhhh, it's nice to see a brand new member already posting awesome content. Welcome, and keep up the good work. I love custom made parts like this.
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#10 Bee-Ri

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Posted 18 January 2014 - 07:17 PM

Sifaka, did you make these gears your self via the standard silicone mould technique?
If so I may have to look into make some for the rough-cut finally allowing more powerful springs.

Thanks, Bee-Ri.
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#11 TARDIS Tara

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Posted 04 February 2014 - 07:30 PM

Not in Florida, but willing to pay postage to try out a set.

This looks so cool!!
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#12 boobie817

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Posted 06 April 2014 - 08:11 PM

I have a modded stampede that I'm adding a brass breach too at the moment that would loved to abuse, i mean test these out. I'm in nyc and would be willing to pay postage and donate to the cause. I love my pede, after the mods.
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