Carburetor Nozzle For Robot

[hoeken]

Hello Experts,

I am part of an open source project called RepRap (www.reprap.org) which is attempting to create an open source 3d printer. Currently to print, we are forcing plastic through a heated metal barrel with a fine nozzle that is currently hand drilled.

Someone suggested we use a carburetor main jet nozzle similar to this to replace the custom nozzles that must currently be handmade:



However, I dont know where to even look. People at the auto store ask me make/model when i just want a nozzle. There is no car involved! Please help me find a suitable part, or at the very least please point me in the right direction.

Here are our requirements:

1. Small Diameter Inner Hole (somewhere between 0.25mm and 1.0mm)
2. Low price (max of $2/3... but $1 would be best.)
3. Common component. (it needs to be something anyone can get off the 'net or at a local store)
4. Threaded. Ideally it would be a common thread that would fit a nut from the hardware store.
5. Metallic. It needs to be used at around 200deg C

Please take it easy on me... I'm a n00b but not an idiot =)

[2.2 Straight six]

hold on, this thing offers "wealth without money" so why are you showing people the designs for free?

someone will just steal your idea, improve it and patent it.

[hoeken]

i'll answer your question, but after that please stay on topic.

1. its just a cheesy slogan. 2. its all open source, its protected by copyright (GPL), and the openness means that we can easily prove prior art (which would invalidate any patent based on it)

[2.2 Straight six]

1 show me i said it was "a cheesy slogan"
2 i wasn't aware of that, no need to take offence.
3 best not to talk to mods in the way like "please stay on topic"

carb nozzles should be easy enough to get in various sizes. call up someone like Holley and ask them what sizes they offer.

http://www.holley.com/

they're among the workd leaders for carbs and fuelling systems.

[hoeken]

sorry, i was just saying that its our cheesy slogan, so dont take it too seriously. i'm not really interested in high-end racing or medium grade parts. i was looking more for a go to Autozone and ask for a Standard Ford/Honda/Whatever part.

think cheap and widely available.

also, is there somewhere that lists the sizes of the diameter of the inner part of the nozzle?

[curtis73]

ladies; you're both pretty.

You probably won't find them at Autozone. Even if they did stock them you'd have to fish through the ranks of High-school dropouts who don't know crap about cars other than the color.

You could go buy some junk carbs. I know its not a steady or reliable source, but the local paper or craigslist often times has them for free or dirt cheap. I have a Qjet that is a complete waste and had I not already scavenged the jets out of it you could have had it for free.

Otherwise expect to pay more like $5-6 per jet from the manufacturer. Look in the phone book for a carb rebuild shop. The one I know has probably 200 jets in a jar on a shelf. You might be able to give them a 20-bill for a handful.

[beef_bourito]

other than fishing around carb rebuilding shops as mentioned above, call some carb companies and ask about jets with the dimentions you're looking for.

kind of off topic but anyways, what kind of quality does this thing produce? how would it compare to something like the Dimension BST? I've got experience with the dimention BST and some other model from Z Corp, so i'm just wondering. what kind of file would it take? (those two took STL files, we converted from a Pro-E file to STL)

[2.2 Straight six]

Originally Posted by hoeken

i'm not really interested in high-end racing or medium grade parts. i was looking more for a go to Autozone and ask for a Standard Ford/Honda/Whatever part.

then take a little initative, go to a dealership/part store/rebuild shop and ask.

you know what you want, you know what tech area it comes from and you have an idea of the place that might sell it. no point sitting on you ass waiting for confirmation. go to one of these places and ask.

unless you're buying in bulk, you won't get them for $1-2. the easiest thing is to machine them from something like stainless steel. it's very strong, can be machined (it's a pain to machine, but it can be done easily once you know how.) the other advantage is that you can machine it to your exact spec. carb nozzles are made for jetting fuel into the carb.

[Moppie]

Originally Posted by 2.2 Straight six

unless you're buying in bulk, you won't get them for $1-2. the easiest thing is to machine them from something like stainless steel. it's very strong, can be machined (it's a pain to machine, but it can be done easily once you know how.) the other advantage is that you can machine it to your exact spec. carb nozzles are made for jetting fuel into the carb.

I think your missing the point of what he's asking


hoeken Its been a while since I dealt with a carb, but I did re-jet an old Stomberg once. The jets were sold in a variety of numbered sizes, all with the same threaded fitting to mount them in the carb.

As Curtis has suggested you need to find a good Carberator rebuilder, who will have a pile of old and new jets laying around, and you can pick and choose what you need.
They will also know the hold sizes for each jet.

[2.2 Straight six]

Originally Posted by Moppie

I think your missing the point of what he's asking

Carb nozzles are made to their designs. so for whatever fuelling requirement, the nozzle is made to suit. if you want a jet of some kind for something else, then you want that jet to meet YOUR requirements. could turn out that all the nozzles are either too big or too small.

[Moppie]

Originally Posted by 2.2 Straight six

Carb nozzles are made to their designs.

Your showing your age.
One way to save costs is to build on size carb, and the fit it with different size jets or needles to suit different engine sizes and levels of tune.

And of course the almost infinite levels of tune that can be applied to each engine design means makers of aftermarket carbs need to be able to provide a similar range of jets or needles.

hoeken Is simply asking if anyone knows if any specific brands of carbs or jets that might fit his needs as it would simplify part of his machines design.

[2.2 Straight six]

My friend always told me, if you can't find what you need, make it.

i know about manufacturing, cost saving etc.. but the point is, there may not be the "right" nozzle. there may be ones that are close, but if you want the perfect part, you have to make it yourself when no-one else makes one.

[GreyGoose006]

Originally Posted by hoeken

Currently to print, we are forcing plastic through a heated metal barrel with a fine nozzle that is currently hand drilled.

Someone suggested we use a carburetor main jet nozzle similar to this to replace the custom nozzles that must currently be handmade

... much later on ...

Originally Posted by 2.2 Straight six

My friend always told me, if you can't find what you need, make it.

i know about manufacturing, cost saving etc.. but the point is, there may not be the "right" nozzle. there may be ones that are close, but if you want the perfect part, you have to make it yourself when no-one else makes one.

You are missing the point of the thread
they currently are making their own parts
the whole point of posting was to find out if anyone has an opinion on weather or not a carb jet would work, and as we all know, opinions are like armpits...

please tell me i'm not the only one who sees this

despite all this, i think a carb jet would do the job if you can find one to match your specifications.

i'd suggest calling up or emailing holley (they are one of the big names in carburetors... there are others to try if they cant help you) and telling them your requirements. just make it clear that you are planning on buying a whole lot of these jets, and that you are serious. the more you are planning to buy from them, the more friendly they will become, and who knows, they might actually want to help you...

[2.2 Straight six]

I KNOW THE POINT.

what i'm saying is that you may not find a nozzle perfect for the job. hence making one that is.

[GreyGoose006]

which he has been doing and is now tired of.