Chromoly

Im an amateur welder and want to try building a motorcycle frame, but don't know what the length and diameter of the avarage motorcycle head tube or steerer tube.

i have made the login form on the html page but i don't know how to make the mysql database table and i don't know how to process the form or compare the input with the data in the database. bottom line i don't know how to make the form functional.

I've got a few bars of aluminum i casted some time back but i don't have the correct tools to machine it into a product is there a company or business i can take it or send it to and have them make what i had in mind from there?

I want to write a c++ program that would require a database to read from for things like inventory and/or contacts, could I use an ms access database and have the program read the data from that, or would I have to code the database from scratch too? I thought having an external file to read from would make the job easier.

I’m not sure if I’m asking this correctly. But I’m learning how to make circuits, and wanted to include an audio jack like the kind on MP3 players, can anyone tell me what the 3 pins on the bottom do and if I were to wire it to a breadboard which pin would go where? Since my Bluetooth isn’t working lately i was thinking of making a transmitter for my car radio so the jack would be input from the mp3.

Im a self proclaimed engineer, im into building, im good at welding and automotive stuff and i've learned c++ but i also wanna try building some electronics, and what ive read is that a micro controller is essentially a computer in a tiny package but for starters i know that my car's ecu has a prom chip, not a controller. what type of circuits call for a micro controller and which ones for rom or prom?

i've been learning about frequencies and radio waves, and one question kinda stuck out, so, say a video camera sends its feed to a wirless receiver and that sends the picture to the screen, if something say like an e-mail or text message happened to of been sent over the same frequency how does the receiver know that its not a video feed and print it to the video screen by accident does the device look for a specific type of data when the transmission comes in? how does the computer know the difference between 2 different types of data being transmitted?

I just completed my first desktop build and I don't have a monitor so im using my tv, I even have a video card in but it still says no signal even though the lights and fans turn on. Does my computer just not work on tv's or did I install something incorrectly my tv detects something is there but there is no signal.

What I just read was that the data on that chip is hardwired into it. so does that mean that each transister is physically given a value of 1 or 0 before it's soldered in? Or is it electronically programmed and the transistors physically retain the value of what was on screen?

im trying to weld a handle together with some steel plumbing pipes i have laying around but im having trouble notching the pipe i keep melting the drill bits and even my hole saws im using my drill press to do this is there an easier way to notch steel pipe?

i have a graphite crucible im gonna be using to melt aluminum but i accidentally got water on it one day, will this weaken the crucible once i fire up my furnace? will my crucible break on its first use now?

If not then what can i use to mix with? and also what type of sand can i use? I can get sand at my local hardware store...

Like I've mentioned in past questions, i do a little bit of backyard metal casting with copper and aluminum, so this is something that got my attention. after doing a little research on how plastics are recycled, i wanted to start melting plastics and make a few things but wasn't sure what to cast or mould it into and then i remembered reading somewhere that skateboard wheels were injection molded like plastics are, and since i do skateboard i thought this would be pretty cool to try first and rip it up at the skatepark with wheels i manufactured myself but since skateboard wheels aren't plastic i thought I'd ask anybody with insight on this.

can skateboard wheels be melted down?

if so is the process similar to melting and molding plastics like hdpe?

what are skateboard wheels made of?

i have a backyard furnace i use every now and then and I was trying to think of a way to make steel less corrosive and i started thinking " why don't people pour molten aluminum and steel into the same crucible before casting?" can you mix two alloys to make an alloy? is aluminum an alloy? what would the end result be, like would the steel be less corrosive or would the aluminum be denser or what?

Thanks in advance

Like does the combustion chamber have to cover the whole cylinder or is it supposed to be smaller than the bore, for example if i have a 4 inch bore would the combustion chamber have to be close to that or can the chamber be a completely different size?

say you have a 6 speed transmission. Would the higher gears such as 4, 5, and 6 be more fuel efficient than the lower gears such as 1, 2, and 3. The way I'm looking at it is that in 1st gear the work load the engine has to do is much easier and is much easier to move the vehicle however it has to do like 5 times more work to move the vehicle. On high gears like 6th the work load that the engine has to do is a lot harder but it has to do less of it to move the vehicle.

In this scenario granted the lower gear makes it possible to get moving but would slightly changing the lower gear's ratio improve mpg? and if so would it be a significant or noticeable increase

if your vehicle is new and doesn't actually have plates yet can you put a decorative or novelty plate on the front until the real plates come in?