Home made model jet engine part 5

[@joewynn2445]

Damn your one hell of a machinist. I want to get a lathe and learn how to do that. And I really want a mini jet engine for my rc airplane I built.

[@cytron8787]

thank you man, wish you the best.

[@sweetgumnyc7794]

are you using a lathe/ mill combo? im really getting interested in learning to build my own jet turbines but i dont own a lathe (i do have a small 3 axis cnc machine but it can only cut aluminum) could you maybe help me figure out what i will need to buy?

[@Alsarraj1010]

Nice thank you for respond I have one more question if you don't mind please the angle of the blade how match , I saw many videos they do the same turbine but I was wondering about the angle of the blade should be the same for all sizes of the jet engine or it's depend . thank you for your responding .

[@Alsarraj1010]

I mean thrust angle please thank you

[@cytron8787]

I think it's around 25 - 30 degrees at the exit, in general too steep angle its good for turbo shaft not for thrust , also makes the engine start easier , but the compressor may stall or surge too early, the opposite happens if it's too shallow, the engine have more thrust it runs hotter and it's harder to start. One good way to understand this is to imagine that every gap between the blades it is a thrust nozzle, smaller gap = more thrust(meaning more thrust to rotate the shaft not move the engine forward) - but it's harder too push air into , opposite happens wen the gap is big.

[@Alsarraj1010]

@@cytron8787 Thank you for the information I learn something from you it's more than I expected appreciate that .

[@philgrainger9627]

Very nice work

[@cytron8787]

Thank you

[@AccidentalScience]

Beutiful. If fully made in stainless could also be converted in a turbomolecular pump.

[@cytron8787]

this maybe a good alternative , if the engine doesn't starts :-).

[@myharris]

Was that a DRO vertical milling slide? You're good at this! The engine's starting to sound like the real thing now, great job

[@cytron8787]

Just a 3 axes cnc machine. The engine is almost ready , can't wait give a test run.

[@josephmufdi4564]

That is so impressive. Holy cow!

[@chiron9536]

what metal did you use for the turbine?

[@skorkmaz]

Amazing. So you don't need the 5th axis to machine a turbine wheel?

[@cytron8787]

Thank you. That's right, but with 5 axis machine you can achieve much better finish and do it much faster as well .

[@skorkmaz]

@@cytron8787 I have converted my BF20L to CNC and currently building cycloidal drive for the 4th axis. Thanks.

[@cytron8787]

@@skorkmaz Nice, wish you good luck on that.

[@mudassirazam3947]

This is for how much thrust?

[@cytron8787]

I don't know, I didn't check it at full throtle.

[@Alsarraj1010]

Hi I have question for you how you do the turbine blades by CNC milling machine or manually? Thank you

[@cytron8787]

it's a cnc , I indexing manually though.

[@rcflyingstuff1243]

Awesome work bro

[@cytron8787]

Thank you!

[@suleymanarslan6817]

What is the quality of the stainless steel you use?

[@cytron8787]

I don't know, it feels like 304 when machining, it is just for test ,for sure it is much better than normal steel.

[@suleymanarslan6817]

@@cytron8787 thank you

[@cytron8787]

@@suleymanarslan6817 no problem

[@nikson1520]

Wow 👏👏👏👏👏

[@EnglishTurbines]

Stainless Steel is not very good for a Turbine wheel. The centrifugal loads and gas temperatures will weaken it. Then theres the constant heat cycling....Inconel is what you should be using..... Same for the NGV section too. Inconel for the vapouriser tubes and Chamber components also....🤔😏🇬🇧

[@cytron8787]

That's correct, but is a bit difficult to find Inconel , and on plus on top of that I have no experience on machining Inconel , from what I know from interned it's a nightmare to deal with. 🤐🤐🤐

[@yousefashry2897]

what will happen if increased the overall diameter of the shaft tunnel 4mm?

[@cytron8787]

it wouldn't fit, I guess🙂

[@yousefashry2897]

There still some area

[@yousefashry2897]

May I contact you through mail please? 😊

[@cytron8787]

@@yousefashry2897 send me message if you want .

[@Jan_Seidel]

I am curious. How did you determine the form of the compressor cover?

[@cytron8787]

Nice question, it's a bit difficult to answer here with details but basically what I have done is that I mount the compressor with the shaft dialed in a four jaw chuck, then I mount a thin metal shim (0.2mm) shaped to a point in the tool post and then I transfer the shape of the compressor using the dials while the lathe was spinning , then I use a CAD software to find the final shape.

[@Jan_Seidel]

@@cytron8787 I am dialing in with CAD and 3D prints. I was initially thinking about to make some plastic mold and spin the wheel in it to get a shape. seems a bit too complicated for the poor output in precision of thhat shape. Cheers

[@cytron8787]

@@Jan_Seidel I think I saw something similar on the internet with wax mold, not a bad Idea, but I don't think it would be as accurate because then you must figure out the mold dimensions :-). Cheers

[@Jan_Seidel]

@@cytron8787 I started to analyse what I know about the shape and had to realise, now matter how complicated an impeller/turbine looks, it sits in a simple housing. Top and bottom are tubes and a curve in the middle. So I made an well educated guess and drafted a torus with tubes, aligning them and cutting surplus away. And guess what? First try a hit :)

[@cytron8787]

@@Jan_Seidel Nice, Yes indeed, the hardest part is to find the radius of the curve which it is an arc , and the center point of that arc. I use in the past the miss hit method and it worked well for me as well.

[@Techgravity-i7y]

Bro I am also making a turbojet engine for my college project so to make turbine which cnc is good except 5 axis that one i don't have. AND I NEED SOME GUIDANCE TO IT. ALSO I NEED CNC codes for it.plz help me bro.

[@abdullahmohamed2083]

Wow amazing work I would like to make a turbine can you please explain what is the name of this machining ?

[@cytron8787]

Thank you. You want the name of the machine that cuts the metal?

[@abdullahmohamed2083]

@@cytron8787 yes and the name of this process please

[@yumetorou23]

cnc 4 axis?

[@cytron8787]

3 axes plus one manual

[@onderekmekci8614]

27.04.2021 I've wacthed

[@nikson1520]

Nazi 👎👎👎👎👎

[@lee-fz4nm]

What is the metal you using for this engine ?

[@cytron8787]

For the turbine I use stainless steel.

[@lee-fz4nm]

@cytron thank you

[@NikosGR_]

Ώπα Έλληνας? Ωραίος! Θα ήθελα να έρθουμε σε επαφή.

[@cytron8787]

Έλληνας απόγονος Σωκράτη Πλάτωνα Αριστοτέλη 🙂. Φίλε εχει κερο να ασχοληθώ με τζετ. Επίσης δεν εχω χρόνο. Αν θέλεις κατι πεστο εδώ, αν ειναι εύκολο θα απαντήσω, ευχαριστώ.

[@NikosGR_]

@@cytron8787 Αρχηγέ ευχαριστώ! Θα σε ρωτήσω εδώ αν χρειαστώ κάτι.

[@NikosGR_]

@@cytron8787από που προμηθεύτηκες τις ράβδους για τον άξονα και για τα αλλά μέρη του κινητήρα (inconel)?

[@eduardoaraujo9606]

You made from modelo kj66?

[@cytron8787]

Yes , except that the turbo is 72mm.

[@yousefashry2126]

@@cytron8787 and what did you change for that size of turbo?

[@edhornet41]

Perfect.....

[@ailijase8]

Greek?

[@cytron8787]

Yes, I am from Cyprus,.

[@mdshagor1173]

Hi cytron give me 1 jet engine I’m from Bangladesh