Q: I'm running a 2212 980kv brushless weapon motor with a 35 amp ESC on a 4S lipo battery in my beetle spinner. Keep your fingers crossed and check tightness before every match. Better design would have the drumette indexed to the top of the motor with hardened pins, or have the motor shaft and drumette keyed to prevent rotation even if the nut is a bit loose - but 'iffy' design of this type is common in insect class 'bots. I'll also point out that you are relying on compression by the retaining nut to both hold the weapon drumette in place and prevent it from rotating relative to the motor. Don't use threadlocker with nyloc nuts - Loctite destroys the nylon. If you need to service the weapon during an event a fresh drop of threadlocker won't have time to properly set, so keep some of the nyloc nuts as supplied with the motor handy in your spares, along with some conventional 12mm washers. Add a drop of threadlocking fluid (Loctite) for extra security. ReconsiderĪ conical washer nut is tempting for the reasons you mention, but if does start to loosen it has progressively less locking force to prevent further loosening. This effectively guarantees structural failure of the weapon motor. Your design hangs a large spinning mass off the far end of the weapon motor, where a weapon impact will act with a large lever advantage on the bearing tube support at the base of the motor.
A hubmotor is embedded inside the device it is powering, like the vertical spinner weapon on 'Algos', or the simple Fingertech clamping drum weapon. My question is this: would it be worth the weight savings and simplicity to run the weapon like this, and if so, are there any methods I should use when designing this to better improve the longevity and durability of this system?Ī: What you are proposing for your weapon is not a hubmotor. I’ve seen similar ideas done so many times to varying degrees of success, hence why I imitated it here… and because a few friends suggested the idea for its simplicity and ease of assembly/use. I plan on replacing the locknut with what’s called a “nut with conical washer” which is 12mm wide and wouldn’t slip through the 9.78mm hole in the weapon. I have two current weapon designs, both using an EMAX 2205 2300kv motor: a hubmotor system with a 3D printed adapter (white in the render below) and a belt-driven system, more aligned with what the original robots ('Jack Move' and 'Jack Rabbit') used. Q: I bought several weapons from another builder and have been looking into putting them to good use. A tank of nitrogen 5000 psi holds only 63% as much gas volume as the same tank filled with CO 2 850 psi. Ī: Because carbon dioxide converts to a liquid at about 850 psi and 'boils off' to release more gas as the pressure drops, a much larger volume of gas can be stored in a given volume compared to nitrogen that stores in the gaseous form. I’m out of my element on this and couldn’t find the info I needed to make that simple comparison simply online.
If 16g of CO 2 worked, how much more nitrogen would I need for the same volume of gas I get from the CO 2? My question is: how much extra tank storage should I allow for to compensate for that switch of gasses. I’ve made a refillable system using a purged CO 2 cartridge as a tank for the nitrogen at 600 psi.
I'll be entering a competition that does not allow CO 2 - only compressed nitrogen.
Q: I have a secondary 'minibot' that uses a little 16-gram disposable CO 2 cartridge to inflate an for a pneumatic weapon.
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