Huge stepper motors have an increased impedance which lowers their response frequency very quickly. You are VASTLY more likely to burn out your stepper driver than the actual motor. I recommend getting a high-power driver capable of 1/128 or 1/256 microstepping, and also boosting your motor and stepper controller voltage as high as you can get away with within your electronics. 48v would be fantastic and it increases the frequency that your stepper motor's coils can reasonably respond at. I made the mistake of trying to upgrade my 3d printer to NEMA 23 steppers one time and it was a massive failure because I didn't realize that stepper torque drops off incredibly fast as the coil impedance and speed both go up. While you have the system still mostly exposed I really, really cannot understate the importance of trying this all with a much smaller NEMA 23 and a high voltage DC PSU *just* for the stepper driver and motor. You might be surprised at the results. Steppers really are a totally different animal from brushless or brushed DC motors and they don't respond to increased size or power the same way *at all*.
That many pulses per second for what reason? As it is, it seems he has less than 30% torque overhead on the motor before it loses steps at 60rpm. Microstepping causes torque loss. Going from no microstepping to... 1/256? He'll have less than 1% of the motor torque. It makes 0 sense what so ever. You lose so much power and torque microstepping. Even going from no-microstepping to 8x would reduce his torque by 80%. His application is barely precise, he probably has 50+ steps lee-way on the rocket alignment with no micrstepping. Only reason to microstep is for smaller step size.. at the detriment to both running torque AND holding torque. Unless I'm entirely missing your point. You also did nothing to bring up how limiting CURRENT to a stepper can increase it's maximum rpm, due to the inductance of the stepper. Is that kind of what you're going with as far as bringing up microstepping, the reduction in coil current, trying to use that route to increase rpm instead of lowering current? Instead of just adjusting current and possibly changing drive voltages?
@@dogsarebest7107 I know nothing of electronics with motors and stuff, just a casual gamer who barely knows the current top specs. But, I think what they were trying to say is that he should simply get a higher quality stepper and not necessarily be using microstepping, hence why it should be a stepper capable of the 1/256 microstep. They never actually said to USE the microstep. Just a little point, not attacking anyone because I literally don't know enough to have an opinion.
!!! Set your NEMA stepper driver to as much microstepping as they can handle (the little white switches on the side of the drive). In the code, increase the number of steps to match the microstepping. Doing that will make the motor much quieter and will remove the thumping noise, and make the max speed much higher
@@darkshadowsx5949 it depends. The holding torque might be a little lower between full steps, but since the torque per step is much much more gradual, you’re actually less likely to get into a stall condition than with full steps, so a lot of the time (especially with loads and at low speeds), you can get away with higher accelerations before stalling. It’s kind of counterintuitive.
Chalk powder would give a nice "explosion" You could also try to load it with fine starch or flour and ignite it at the target area. Gives a nice fireball (danger included).
I also think it's cool. While we wait for the next video, you could see a rocket-powered baseball bat !! And a ton of other cool stuff. Think the channel name is "Get smarter everyday"
Out of everything you have built, this is hands down my favorite build and if I’m being honest, so far it appears to be your most accurate. Keep it up. I want to see this thing running
god its so cool, the whole time I was imagining it launching rockets at stuff, Ya got to see if you can throw a rocket hard enough to crack a watermelon
That looks so awesome! Even the sound is perfect. Just a quick safety tip: If you're using a router table without a fence, you really need to use a starter pin. The table should have some holes on it to install one and even just a screw with a bushing should be enough. And a push block wouldn't be a bad idea either. Routers will turn your fingers into ground meat really quickly.
I’m unfamiliar with what a starter pin is, but pvc foam board routes like butter since there is no grain. Go slow and it never grabs. I wouldn’t have done this with wood. Trust me! routers freak me out. Making digits disappear into mist in the blink of an eye.
the only thing cooler than watching someone build an awesome rocket launcher is watching them get that magic in their eyes that they had when they were a kid.
not sure how hard it would be to do, but shooting a grunt or elite (like a 3d printed head or something, but might be too much work) would be amazing also seeing the genuine happiness you had with it is actually amazing
Love how you give so much details. The feeling of hitting that Halo 1 Warthog with a rocket from across Blood Gulch... right before they score the flag...
yeah, bro! what ever anyone says, my strongest opinion is that this is freaking more than incredible for a dude who is not an expert per say, yet is engineering something, with resourceful help from friends, with great videography, to help make our wildest dreams come true. too cool, bro.
9:37 - You should have made an "inner guide rail" that is curved like the tube to avoid any rubbing issues and just have the rollers / gear come through that guide. A little weight, but if it's aluminum framing (with foam in between the frame spokes) it can be lightweight and look complete.
Maybe find a car from a scrapyard to shoot at? Closest to a banshee or warthog if you ask me. For fun targets maybe ask the Hacksmith if they have some fun ideas? Caps shields, maybe they still have some Alienhead leftovers and check if you can find some ballistics gel zombie heads or anything equivalent. Fruits work super but I don't know if they would give the Halo vibe. A self made Grunt Pinata that explodes into Konfetti like in when you activate headshot fiesta should give the perfect vibe but might be a lot of extra work. Such a very cool project please continue letting us experience your troubles and success with the project 👍
Sweeeeet! Yeah melons would be cool. Maybe find some maniquins. With that rocket model. I see an issue with the small rear fins. Maybe see about how to put spring loaded fins. So they deploy after leaving the tube.
Ive been working as an aviation electronics tech for a few years and it still blows my mind how complicated the "normal" things are. If only the average person knew
It's amazing the different approaches people think about based on their expertise. I would have made a timed gearing system. You chose a more fragile, but ultimately more impressive and lighter weight option. This definitely got my nerd energy flowing today. Thanks!
you need to shoot a grunt with it (like a cut out or something) cuz that's what you do with explosive ordinance... you shoot the weakest enemy you can find with it! (also if it has confetti that would be a plus)
Man sir. You are inspiringly smart and a great problem solver about issues. Great videos. As far as what to shoot. Gotta be watermelon or ballistics gel.
hey, its been a while since I've seen any of your vids, but I remember some of your earliest projects, its incredible how far you've come! Your skills are seriously impressive now. Also, the extra production quality is great. Maybe a little much with some of the music, but overall, awesome. Great project too!
As far as targets go, I guess it depends what kind of force your planning them to have? If they're just gonna be fast but not all that punchy then maybe some paper targets in a few fun franchise savvy shapes such as different enemy types or something?
You should check out TAGinn Airsoft, they make airsoft pyrotechnics for grenade launchers and hand grenades. Completely safe to use with eye protection and it would be awesome to see this thing fire something that actually goes boom. Or you could get chalk rounds for it too!
This is so sick I can't wait to see where you take this and how it will look when it's done. You should test it out on some grunts, one of my favorite enemies because of the noises they made.
I had a similar interference issue when running sensor wire close to stepper motor wires in one of my projects. I had to use sheilded wire, you can probably get some sheilded ethernet quite cheaply. I still had some bit errors come through, but a crc check added by my sensors filtered the remaining errors out nicely.
@JAIRUS OF ALL Please shoot some 1'x1' (smallish) cardboard boxes filled with different(?) colored packing peanuts! This looks like a fun project, can wait to see it completed Jairus!
What to shoot with the rocket : watermelons and 2 liter soda bottles, also a manikin and a giant thin paper with a halo grunt printed on it( the cuter the better ) rig up a hydrogen balloon too and stick a sparkler on the front of the rocket
G rockets that use the 2 wire system ignition, preloaded in a cartridge with an outside permenently mounted disc (so that way contact happens regardless of oreintation) that allows the signals from the launcher to send to each rocket.
With all these creators on RUclips working on stuff like this in 2 decades we’ll have functional MJOLNIR and Iron Man armors that work like they do in there respective universe’s.
Interesting decision to step drive the spin. I'd have likely used a tangent drive/geneva drive or a spring-latch system. Both give much faster initial spin while also having the barrel spin without windup, not to mention mechanical movements tend to be more authentic than purely electronic ones. Downside is half a rotation at a time, and loud noise both during unlatch and during the re-winding of the spring that would rotate the barrels. But both are sort of acceptable imo when you're talking about SPANKR.
Going to 80rpm was a good idea. You're stress-testing your system. If it can handle higher loads than needed without issue, then it can handle your base load. But it also is great content, because BIG THING SPIN FAST GOOD!
pumpkins, watermelons, dummies, foamboard, etc (mainly stuff that it might be able to go through), then for the lulz, shoot harder targets to see what'll break the rockets (obv make some spares)
i think a funny target would be a halo toy warthog of some kind, but that may be a bit small maybe just a big cardboard box with a picture of any halo vehicle would be enough lol
Perhaps have the tips be soft and be a releasing parachute mechanism- so that you can shoot them at things or into the air and be relatively safe either way. Then perhaps have a interchangeable CO2 cartridge or small rocket propulsion, so the individual projectiles can be reused, and refueled
I say shoot the classic mellons, if you can get your hands on one of the zombie go boom skulls use one of them. I also say you fill up a disco-ball with glitter and blast that. But thats up to you ;)
years ago i made the spnkr from reach. as far i know i was the only one to make it launch rockets internally. i dont seem to have any of the old video up but i lose it to a fail firework a few years back.
You gotta find that guy who built a warthog in Michigan and bring the finished launcher there, I Need to see you riding shotgun and blowing up some cardboard cutouts of the covenant!
I saw another comment about using shielded wire... Shielded wire would help but in addition to that I would add a ferrite choke to the sensor wires since the stepper drive is giving (essentially) AC interference. The choke (like what you see on laptop power cables and most other DC power supplies) adds impedance to the wire and acts like a low pass filter. tl;dr get a ferrite choke, wrap the wire around it a few times and snap it closed, voila you should have much less interference from your motor. For best results put the choke as close to the input pins of your microcontroller as possible.
12:16 - I would NOT rely on indexing with the limit switches. Use a notch / cutout for alignment and use a physical switch to sense that. Then you can physically stop the motor, signal to the micro, and prep for moving past the switches after firing. Indexing is SOOOOOOO easy to get wrong -- that vehicles use CHAINS to ensure timing is correct on engines. While it won't hurt to be off by 1 or 2 steps, it's still unreliable long term if you can avoid it.
So much problem solving this episode! Looks great in motion. The roundovers really transform the look too.
Huge stepper motors have an increased impedance which lowers their response frequency very quickly.
You are VASTLY more likely to burn out your stepper driver than the actual motor. I recommend getting a high-power driver capable of 1/128 or 1/256 microstepping, and also boosting your motor and stepper controller voltage as high as you can get away with within your electronics. 48v would be fantastic and it increases the frequency that your stepper motor's coils can reasonably respond at. I made the mistake of trying to upgrade my 3d printer to NEMA 23 steppers one time and it was a massive failure because I didn't realize that stepper torque drops off incredibly fast as the coil impedance and speed both go up.
While you have the system still mostly exposed I really, really cannot understate the importance of trying this all with a much smaller NEMA 23 and a high voltage DC PSU *just* for the stepper driver and motor. You might be surprised at the results. Steppers really are a totally different animal from brushless or brushed DC motors and they don't respond to increased size or power the same way *at all*.
you mean STPPr motors?
This man steppers.
That many pulses per second for what reason? As it is, it seems he has less than 30% torque overhead on the motor before it loses steps at 60rpm. Microstepping causes torque loss. Going from no microstepping to... 1/256? He'll have less than 1% of the motor torque. It makes 0 sense what so ever. You lose so much power and torque microstepping. Even going from no-microstepping to 8x would reduce his torque by 80%. His application is barely precise, he probably has 50+ steps lee-way on the rocket alignment with no micrstepping. Only reason to microstep is for smaller step size.. at the detriment to both running torque AND holding torque.
Unless I'm entirely missing your point. You also did nothing to bring up how limiting CURRENT to a stepper can increase it's maximum rpm, due to the inductance of the stepper. Is that kind of what you're going with as far as bringing up microstepping, the reduction in coil current, trying to use that route to increase rpm instead of lowering current? Instead of just adjusting current and possibly changing drive voltages?
I'm actually blown away that I understand what your saying. Thank god for older 3D printers being a massive headache lmao
@@dogsarebest7107 I know nothing of electronics with motors and stuff, just a casual gamer who barely knows the current top specs. But, I think what they were trying to say is that he should simply get a higher quality stepper and not necessarily be using microstepping, hence why it should be a stepper capable of the 1/256 microstep. They never actually said to USE the microstep. Just a little point, not attacking anyone because I literally don't know enough to have an opinion.
!!! Set your NEMA stepper driver to as much microstepping as they can handle (the little white switches on the side of the drive). In the code, increase the number of steps to match the microstepping. Doing that will make the motor much quieter and will remove the thumping noise, and make the max speed much higher
doesn't micro stepping reduce torque?
@@darkshadowsx5949 it depends. The holding torque might be a little lower between full steps, but since the torque per step is much much more gradual, you’re actually less likely to get into a stall condition than with full steps, so a lot of the time (especially with loads and at low speeds), you can get away with higher accelerations before stalling. It’s kind of counterintuitive.
Chalk powder would give a nice "explosion"
You could also try to load it with fine starch or flour and ignite it at the target area. Gives a nice fireball (danger included).
This is such a cool project. Surely you gotta make some life-size covenant alien dummies to shoot. A few grunts, a couple of hunters and elites etc.
I also think it's cool. While we wait for the next video, you could see a rocket-powered baseball bat !! And a ton of other cool stuff. Think the channel name is "Get smarter everyday"
Out of everything you have built, this is hands down my favorite build and if I’m being honest, so far it appears to be your most accurate. Keep it up. I want to see this thing running
god its so cool, the whole time I was imagining it launching rockets at stuff, Ya got to see if you can throw a rocket hard enough to crack a watermelon
首先你的头像吸引了我，哈哈这柯基犬很可爱，昨天我到了你的主页查看，刚一看到你订阅了mr strea..wow北极熊头像。我点进去查看 我以为她养了黑熊抱着它把它放到洗衣机洗澡呢，我点进去一看是俩人拿着俩阴茎互打..我当时想你什么品味。后来发现挺好玩。生活中你现在有哪些玩物爱好？
I want to see it explode cars
@@TgamerBio5529 youo mean wraiths
@@mythicknz8203 chevy tahoes
That sounds so lame. Lol
See if it shoots a rocket hard enough to crack a watermelon.
Folding fins that flip out via spring would help making the "accurate to game" rocket work
it's a crying shame this guy doesnt have a mil subs, these builds are so sick
Looking awesome. And the sounds of the spinning and the latch sound great! At least for me, one of your most exciting builds!
For the rockets remember that some modern missiles have fold-out or spring loaded wings that open up after leaving the barrel
That looks so awesome! Even the sound is perfect.
Just a quick safety tip: If you're using a router table without a fence, you really need to use a starter pin. The table should have some holes on it to install one and even just a screw with a bushing should be enough. And a push block wouldn't be a bad idea either. Routers will turn your fingers into ground meat really quickly.
I’m unfamiliar with what a starter pin is, but pvc foam board routes like butter since there is no grain. Go slow and it never grabs. I wouldn’t have done this with wood. Trust me! routers freak me out. Making digits disappear into mist in the blink of an eye.
I like that you actually take the time to score your surfaces before putting down the hot glue...
I have never seen anybody else do that but myself...
What a cool ass channel you got so glad I saw a random short of yours and I never even watch those normally what a happy accident 😎
Shoot rockets full of those firework POP-It’s that explode when they are thrown on the ground
the only thing cooler than watching someone build an awesome rocket launcher is watching them get that magic in their eyes that they had when they were a kid.
not sure how hard it would be to do, but shooting a grunt or elite (like a 3d printed head or something, but might be too much work) would be amazing
also seeing the genuine happiness you had with it is actually amazing
Love how you give so much details. The feeling of hitting that Halo 1 Warthog with a rocket from across Blood Gulch... right before they score the flag...
I know nothing about any of this, but the process of discovery and iteration has been amazing to watch. And as a Halo fan, this is just plain cool.
yeah, bro! what ever anyone says, my strongest opinion is that this is freaking more than incredible for a dude who is not an expert per say, yet is engineering something, with resourceful help from friends, with great videography, to help make our wildest dreams come true. too cool, bro.
9:37 - You should have made an "inner guide rail" that is curved like the tube to avoid any rubbing issues and just have the rollers / gear come through that guide. A little weight, but if it's aluminum framing (with foam in between the frame spokes) it can be lightweight and look complete.
Maybe find a car from a scrapyard to shoot at? Closest to a banshee or warthog if you ask me.
For fun targets maybe ask the Hacksmith if they have some fun ideas?
Caps shields, maybe they still have some Alienhead leftovers and check if you can find some ballistics gel zombie heads or anything equivalent.
Fruits work super but I don't know if they would give the Halo vibe.
A self made Grunt Pinata that explodes into Konfetti like in when you activate headshot fiesta should give the perfect vibe but might be a lot of extra work.
Such a very cool project please continue letting us experience your troubles and success with the project 👍
Jeez that is fast and smooth, so much tinkering but you did it man, well done 👏🏻😎
This might be the coolest build I have ever seen! Super excited for the new episode!
Sweeeeet! Yeah melons would be cool. Maybe find some maniquins. With that rocket model. I see an issue with the small rear fins. Maybe see about how to put spring loaded fins. So they deploy after leaving the tube.
12:05
High explosives
Fragmentation
N A P A L M
The pure joy on your face when it all started working properly.......... That is what it's all about. Can't wait for the next video!!
Ive been working as an aviation electronics tech for a few years and it still blows my mind how complicated the "normal" things are. If only the average person knew
This will be your best project I can see it how amazing it will become
This is such an amazingly underrated series (and channel)
It's amazing the different approaches people think about based on their expertise.
I would have made a timed gearing system. You chose a more fragile, but ultimately more impressive and lighter weight option.
This definitely got my nerd energy flowing today. Thanks!
YES! Huge cheers and victory screams. So phenomenal.
Underrated channel, thanks for the awesome build/vid!
you need to shoot a grunt with it (like a cut out or something) cuz that's what you do with explosive ordinance... you shoot the weakest enemy you can find with it!
(also if it has confetti that would be a plus)
Make the Halo version of yourself shoot the Kratos version of yourself. :) Loving the progress on this build. ✌❤
This is so epic! Even to the point of timing it to the game⏰well thought out, love seeing the process and your little jokes keep it engaging!
Man sir. You are inspiringly smart and a great problem solver about issues. Great videos. As far as what to shoot. Gotta be watermelon or ballistics gel.
hey, its been a while since I've seen any of your vids, but I remember some of your earliest projects, its incredible how far you've come! Your skills are seriously impressive now. Also, the extra production quality is great. Maybe a little much with some of the music, but overall, awesome. Great project too!
This made me smile like an idiot. Teen memories coming up. Love it. Subbed
As far as targets go, I guess it depends what kind of force your planning them to have?
If they're just gonna be fast but not all that punchy then maybe some paper targets in a few fun franchise savvy shapes
such as different enemy types or something?
You should check out TAGinn Airsoft, they make airsoft pyrotechnics for grenade launchers and hand grenades. Completely safe to use with eye protection and it would be awesome to see this thing fire something that actually goes boom. Or you could get chalk rounds for it too!
This is so sick I can't wait to see where you take this and how it will look when it's done. You should test it out on some grunts, one of my favorite enemies because of the noises they made.
Can't wait to see it completed!
10:36 That's what we need. We feel the need... The need for speed!
I had a similar interference issue when running sensor wire close to stepper motor wires in one of my projects. I had to use sheilded wire, you can probably get some sheilded ethernet quite cheaply. I still had some bit errors come through, but a crc check added by my sensors filtered the remaining errors out nicely.
I don't know what hes making , but I love how happy he is
Awesome video Jairus! Your channel is looking great!
@JAIRUS OF ALL Please shoot some 1'x1' (smallish) cardboard boxes filled with different(?) colored packing peanuts! This looks like a fun project, can wait to see it completed Jairus!
100% this build series is gonna have like 2M views a video out of no where
What to shoot with the rocket : watermelons and 2 liter soda bottles, also a manikin and a giant thin paper with a halo grunt printed on it( the cuter the better ) rig up a hydrogen balloon too and stick a sparkler on the front of the rocket
G rockets that use the 2 wire system ignition, preloaded in a cartridge with an outside permenently mounted disc (so that way contact happens regardless of oreintation) that allows the signals from the launcher to send to each rocket.
Beautiful man love your work.
Best mechanical engineer I've ever seen 🥶
OMFG!!! Awesome!!! I’m grinning as much as you :)
10:02 gosh I love that sound
if i had to switch careers this human is pretty much the perfect example of what that would be.
I just found your channel and I’ve got to say your stuff is really cool and I will subscribe.
For EMS Shielding, you can buy metal braided sleeving. With proper grounding it will help solve most EMS problems.
Paramount should hire you as the lead prop designer for the upcoming halo show
With all these creators on RUclips working on stuff like this in 2 decades we’ll have functional MJOLNIR and Iron Man armors that work like they do in there respective universe’s.
nice work on the reloader!
Holy shit this is going to be such a cool project when its finished
Amazing to see the thing in real life! As for targets, you should shoot a plasma ball with it! That'd look cool as hell especially if you got slomo.
This is what i call an epic gamer
router tables are the best upgrade to a router imo
love mine
it's great seeing you have so much fun making this! :)
Interesting decision to step drive the spin. I'd have likely used a tangent drive/geneva drive or a spring-latch system. Both give much faster initial spin while also having the barrel spin without windup, not to mention mechanical movements tend to be more authentic than purely electronic ones. Downside is half a rotation at a time, and loud noise both during unlatch and during the re-winding of the spring that would rotate the barrels. But both are sort of acceptable imo when you're talking about SPANKR.
Will the weight of the rockets (when loaded) affect the motors ability to spin at 60rpm? Freakin EPIC though bro! Love the vids!!!
Going to 80rpm was a good idea. You're stress-testing your system. If it can handle higher loads than needed without issue, then it can handle your base load. But it also is great content, because BIG THING SPIN FAST GOOD!
Let’s gooo this is gonna be sick
Id love to see you shoot a birthday cake as an homage to the confetti skull from Halo 3.
when that 60 rpms worked the first time my inner kid cried out for nostalgia
I think that the best things to shoot would be your classic go to combo of watermelon + door
That thing looks awesome!!!!
Dude this is freaking incredible !
first time visitor to your channel, SUBSCRIBED.
pumpkins, watermelons, dummies, foamboard, etc (mainly stuff that it might be able to go through), then for the lulz, shoot harder targets to see what'll break the rockets (obv make some spares)
Grunt Birthday Party.
Shoot confetti, or candy haha.
Grunts, Hunters, Elites. The Covenant!!!
i think a funny target would be a halo toy warthog of some kind, but that may be a bit small
maybe just a big cardboard box with a picture of any halo vehicle would be enough lol
Gotta cap a grunt made out of cake with this Monster
This put a huge smile on my face! Good job i would also like to know will you be putting the schematic and stl for 3d prints available once finished?
You should shoot some grunt pinatas filled with confetti, it will be like you have the grunt birthday effect.
this is the coolest thing ever!
Cool project!
Amazing job dude! already looking forward to the finished project. Btw we have almost the same craftsman name lmao
Perhaps have the tips be soft and be a releasing parachute mechanism- so that you can shoot them at things or into the air and be relatively safe either way.
Then perhaps have a interchangeable CO2 cartridge or small rocket propulsion, so the individual projectiles can be reused, and refueled
Beautiful!
I say shoot the classic mellons, if you can get your hands on one of the zombie go boom skulls use one of them. I also say you fill up a disco-ball with glitter and blast that. But thats up to you ;)
You should shoot some jelly thing for sure! So the rocket can go through it (or get stuck in it!)
Target: Whacky inflatable arm-flailing Covenant man!
This is really cool!
u ga ga gayyyyyyyyyy
years ago i made the spnkr from reach. as far i know i was the only one to make it launch rockets internally. i dont seem to have any of the old video up but i lose it to a fail firework a few years back.
You gotta find that guy who built a warthog in Michigan and bring the finished launcher there, I Need to see you riding shotgun and blowing up some cardboard cutouts of the covenant!
I would recommend getting emi shielded wire if you continue to get interference
Halo Rocket? Subscribed.
I saw another comment about using shielded wire...
Shielded wire would help but in addition to that I would add a ferrite choke to the sensor wires since the stepper drive is giving (essentially) AC interference. The choke (like what you see on laptop power cables and most other DC power supplies) adds impedance to the wire and acts like a low pass filter.
tl;dr
get a ferrite choke, wrap the wire around it a few times and snap it closed, voila you should have much less interference from your motor.
For best results put the choke as close to the input pins of your microcontroller as possible.
Microstepping will also help cut out a lot of that nasty high frequency ringing in the motor coils (these are HUEG) and reduce some of the EMI.
12:16 - I would NOT rely on indexing with the limit switches.
Use a notch / cutout for alignment and use a physical switch to sense that. Then you can physically stop the motor, signal to the micro, and prep for moving past the switches after firing.
Indexing is SOOOOOOO easy to get wrong -- that vehicles use CHAINS to ensure timing is correct on engines.
While it won't hurt to be off by 1 or 2 steps, it's still unreliable long term if you can avoid it.
For shooting get some of those realistic zombie heads that the hack smith always has
This looks so sick!!!!!! You should try to find a scrap car and blow it up lol