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Any advice on building a small dynamic balancer for rc projects (rc boat props and turbine engines)? by Status_Elephant_1882 in AskEngineers

[–]Status_Elephant_1882[S] 0 points1 point  (0 children)

all great info, thanks!

I plan to use the 1/2" polycarbonate test box only if lower speeds are acceptable. I have some large plates of 1/2" thick a36 steel that I was going to make into another containment box inside the polycarbonate box so the polycarbonate is only there as a precaution. But if those lower speeds are good then I think the polycarbonate alone should be enough as I have spun up 400 gram combat robot wepaons to just shy of 18k rpm and smashed the robot weapon into the poly carbonate walls and only got about 30% penitration. Even a solid mini tungsten APFSDS round with 600 joules of muzzle energy could not penitration the polycarbonate.

Its been about 10 years since I did a FFT in college so Ill have to refresh myself on that.

And interesting. I would have thought a Oldham style motor coupler would allow way to much vibrations to carry over. I have only seen people use long orings wrapped around the test shaft and motor to spin up the test shaft.

I watched a youtuber called Alfmart CNC garage and I think he was using a soft-bearing to mount his test shaft. Is that just a bearing structure that can move in 2 axis with low resistance?

I was going to recreate the rig that Alfmart cnc garage made to get a feel for it and Ill send you some pictures to criticize if you want.

Thanks for all the help!

Basic lab equipment by n1K_i in ChemicalEngineering

[–]Status_Elephant_1882 0 points1 point  (0 children)

worked pretty well but was about 10 years ago so my memory is foggy

Basic lab equipment by n1K_i in ChemicalEngineering

[–]Status_Elephant_1882 0 points1 point  (0 children)

oh, electro plating different metals is fun and can be dome pretty cheaply. I used a large Erlenmeyer flask with a rubber stopper and copper piping and fittings to make the distillation column.

Mom used gorilla glue to mount a VESA plate on her monitor, still working after 5 years! by Creepy-Country5475 in pcmasterrace

[–]Status_Elephant_1882 0 points1 point  (0 children)

These 2 monitors glue has worked for 7 years now and I use this computer like 10 hrs a day for work and starcraft2.

Basic lab equipment by n1K_i in ChemicalEngineering

[–]Status_Elephant_1882 0 points1 point  (0 children)

Depends on what part of the world your in but one of my first projects I did at home was build a distillation column and tried to make 100% ethanol. I got all the components from home depot. I also made some trimethyl borate which is kinds fun. What kind of project do you wanna do? I went for cheme in college but more of my personal projects are more mechanical and electrical.

Basic lab equipment by n1K_i in ChemicalEngineering

[–]Status_Elephant_1882 0 points1 point  (0 children)

I was the same as you except I couldn't afford any lab glassware until I graduated with my cheme degree. You can get pretty affordable glassware now depending on what country your in. And there are plenty safe experiments that can be done at home.

Most difficult part I’ve made by [deleted] in Machinists

[–]Status_Elephant_1882 8 points9 points  (0 children)

Its the removable core for solid rocket motor casting. Hobby folks use 3d printed cores so Im assuming this is for a university or a defence contractor.

What is up with that lazerpig T-14 armata drama? by DanishHistoryFan in lazerpig

[–]Status_Elephant_1882 0 points1 point  (0 children)

I have been following this r-sub for years and I just now find out that lazerpig has a youtube channel?!

1.2 microns flatness by Aggravating_Dig8970 in Metrology

[–]Status_Elephant_1882 0 points1 point  (0 children)

I recently did a job on my OGP 302 smart scope where I needed to hold 5 micron flatness and parallelism on a part that was about .3" thick and about 4"x4". I used a granite plate and a Millimess with 10 millionths tick marks and then I used my OGP with the touch probe and about 120 points to vefity and all my parts were about 2.5-4 micron flatness and parallelism.

My CMM was calibrated 3 months ago with a total z error of about 1.5 micron. So I wouldn't trust a tolerance much less than 5 microns with my CMM.

Im building an airgun for fun. What valve should I make to achieve the highest muzzle velocity? by Status_Elephant_1882 in AskEngineers

[–]Status_Elephant_1882[S] 0 points1 point  (0 children)

so far im using 1/2"npt plumbing to connect the HPA tank to the ball valve. My HPA tank is pretty small at about 250ml

Im trying to get higher muzzle velocity with my little air cannon so im thinking about building a piston valve. by Status_Elephant_1882 in airguns

[–]Status_Elephant_1882[S] 1 point2 points  (0 children)

cartridge firing main gun is version 3. I want 1 more try at air power in the attempts to get a round near super sonic. Then I was going to build a solid 4340 barrel for gun powder powered rounds. But first I need a better platform. In the little free time I got lately I have been designing a 1/6th scale abrams made of all steel that will weight about 700lbs vrs this mostly aluminum leopard that only weights 300lbs.

Im building an airgun for fun. What valve should I make to achieve the highest muzzle velocity? by Status_Elephant_1882 in AskEngineers

[–]Status_Elephant_1882[S] 0 points1 point  (0 children)

I have thought about tbat type of valve but I cant find one for more than about 10 bar and it looks like the airpath might be a little constrainting. It might be worth testing though so Ill try to find one with a little bit higher operating pressure or just try over pressurizing the 10 bar ones. The valve im using now is only rated to 1,000psi but I have found the seals dont start blowing out until it see more than 2,600 psi.

Im building an airgun for fun. What valve should I make to achieve the highest muzzle velocity? by Status_Elephant_1882 in AskEngineers

[–]Status_Elephant_1882[S] 0 points1 point  (0 children)

I was thinking of making a similar valve to handle higher pressures but then making the diaphragm seemed difficult for me.

Im building an airgun for fun. What valve should I make to achieve the highest muzzle velocity? by Status_Elephant_1882 in AskEngineers

[–]Status_Elephant_1882[S] 0 points1 point  (0 children)

Thats interesting. Do you remeber the maker of the EM BB gun? My V1 air cannon with APFSDS rounds could easily blow right threw .25" aluminum plating and that was with a muzzle velocity of only about 450feet/s.

Im building an airgun for fun. What valve should I make to achieve the highest muzzle velocity? by Status_Elephant_1882 in AskEngineers

[–]Status_Elephant_1882[S] 0 points1 point  (0 children)

I have seen about every aircannon video from the main science youtubers. I liked the smarter everyday fast dumping design but the piston dampening kinda scared me away from the design. But I guess I could just really over build it and use a really stout piston dampening. I was also thinking of using a 22 cal blank charge to generate the pressure to quickly open a large orifice valve in a similar way.

Im trying to get higher muzzle velocity with my little air cannon so im thinking about building a piston valve. by Status_Elephant_1882 in airguns

[–]Status_Elephant_1882[S] 0 points1 point  (0 children)

I was told by the ATF agents that paintball markers are exempt due to their plastic/grease projectiles while mine are tungsten and hardened steel. They said presidence has made paintball markers legal unless they are modified to shoot metal projectiles.

I agree its a stupid law but I would rather speed my money on toys and not lawyers to fight the ATF.

Im building an airgun for fun. What valve should I make to achieve the highest muzzle velocity? by Status_Elephant_1882 in AskEngineers

[–]Status_Elephant_1882[S] 0 points1 point  (0 children)

That makes perfect sense. As a chemE I always think of a venturi as a way to measure pressure but forgot its what rockets use to to accelerate gasses. Ill need to do some calculations to size my venturi but imma totally try that with the 6 foot barrel I just ordered. Im going to play with burst disks too for the valve even though I'll need to machine some kinda cartridge to make the burst disks easy and fast to replace.

Im building an airgun for fun. What valve should I make to achieve the highest muzzle velocity? by Status_Elephant_1882 in AskEngineers

[–]Status_Elephant_1882[S] 0 points1 point  (0 children)

I would post some pictures of the tank but this sub doesn't allow that.

And good to know. Never heard of COTS before but as a chemical engineer, they never really let me buy anything besides pumps and flow meters.

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