Jyang

I think it's fine for now, assuming that you've done a decent rewire (i.e. using silicon 18AWG wire, replaced switches, heatshrink, no flailing loose ends, connector is rated) and that the battery is specced well.

Chances are the stock motors with their metal brushes will burn out after some time (in like a year, maybe?), but that's no big deal, replacing those is usually reasonably affordable.

Just to be sure though, what battery is that? Do you perhaps have a more accurate part number/name? I'm guessing it's nickel, which should be fine, but there's always the fear that you're using an underspecced lipo (in terms of current draw), which can cause problems.

Not sure how much information/background you have/need, so I'll just infodump and we can weed through stuff together, I suppose.

Now, I assume that you're using a motor to push a gear, bit like an XSW kit, and leaving the thing on slamfire.

So for the following equations, assume that length refers to the pitch diameter of the sector gear that the motor is driving.

Calculating the amount of torque the motor needs:

http://hyperphysics....base/torq2.html

This should give a quick overview of translating torque to force and vice versa.

TL;DR - torque = length x force

Translating RPM and omega:

Here's how to translate RPM to rad/s, because that's more useful for our calcs.

https://sciencing.co...ns-8343758.html

Here's a calculator if you're lazy

https://www.convertu...o/radian/second

Translating omega and velocity:

tangential velocity = omega x length

So that's basically how to calculate required operating RPM and torque. Now, you don't actually have to get a motor that fits this - you can use a gearbox, which messes with the torque and rpm outputs, via mechanical advantage, but I'm guessing you already thought of that. Hope this is useful, feel free to ask for more/less detail, I'm more just dumping this info so we have a starting point for discussion.

Alternatively you could just get a swarmfire or speedswarm, but hey, R&D is always cool to see.

Hey everyone,

Hope this is the right place to post, I wasn't sure if this belonged here, or as a concept thread.

Basically, I'm hoping to 3D print a nerf flywheel blaster using a PLA printer with a 20x20x20 print capacity, that has yet to be calibrated, but having little experience with flywheels or 3D printing, I'm going to need a little bit of advice.

Firstly, because I don't have any better ideas for aesthetics, I'm planning on making a blaster with a similar appearance to the FG42, so the gun is going to be side-fed.

I've seen very little information on this online, and I'm not sure if it's because the only gun that springs to mind with side feeding is the raider (which seems largely unpopular), or if it's because side feeding is a bad design.

Secondly, I've found little in the way of people reinforcing their larger 3D prints, like stocks and grips with cheaper, stronger material like wood/metal rods.

Given that I'm planning on 3D printing the case, I'm tossing up between this or trying to find some broken/discarded nerf shells to use as casing, and building upon those instead.

Thirdly, I've several DC motors salvaged from printers I'm hoping to use.

The two on the far left are 130s, I believe, but I'm not sure of their specifications, so it's unlikely that I'm going to be using them.

From (fairly unreliable) datasheets I've found online, it appears that the third and fourth motors are capable of producing 12-15k RPM, which is no where near as fast as the desired 20k+ that I've heard reported from Rhino MTBs or the Tamiya Plasma Drives, but I feel as though through a combination of larger flywheels (3D printing custom flywheel cages is an option), and a higher torque, these should suffice.

For reference, I gather that the current "high end" motor is the Rhino MTB, producing 36k RPM, with the 2" radius stock flywheels, this results in tangential velocity of roughly 628fps, achieving the glass ceiling of 120fps

Since I'm happy achieving around 100fps, I feel as though this is overkill, especially since I only have NiMh batteries to work with. I'm wondering if anyone has any experience with high-torque, low-RPM motors like the ones I have?

Alternatively, I'm toying around with the possibility of using the third and fourth motors in my image as afterburners, with the small ones as launchers. Also, I should be able to mimic the shape of worker wheels, since I'm 3D printing the cage and wheels, anyway.

Anyway, I've got a ton of things to figure out, and I really appreciate you guys letting me post here.