|
Post by Johansson on Nov 11, 2023 17:06:57 GMT -5
Hi Anders, i have use www.conelayout.com you print out all the segments on A4 paper and cut a long the lines stick them onto the sheet metal and cut to that shape and roll. Cheers, Mark. Yeah, I´ve used that a lot. But in this case I have the slots made exactly where the vanes will fit, so I need to work backwards from the 3D-model to a 2D-cone layout.
|
|
slittlewing
Senior Member
Joined: November 2017
Posts: 458
|
Post by slittlewing on Nov 19, 2023 4:25:34 GMT -5
Great to see you are back to building Anders! I look forward to seeing the giant jet donut take shape 😁 sounds like it will be very powerful too!
Cheers
Scott
|
|
|
Post by Johansson on Nov 19, 2023 8:50:17 GMT -5
Great to see you are back to building Anders! I look forward to seeing the giant jet donut take shape 😁 sounds like it will be very powerful too! Cheers Scott Hi Scott, I hope so, my neighbors have had it peaceful and quiet for far to long now so it better make some serious noise.
|
|
|
Post by Johansson on Nov 19, 2023 13:21:49 GMT -5
I´ve spent a couple of evenings making a 1/4 scale mockup of the engine internals, I scrapped the first idea and made it simpler but still correct to scale to avoid tons of M2 screws and joints everywhere. Sorry about the crappy pics, I don´t have a smartphone so I use an old digital camera. I have not decided about the length of the shaft tunnel, the 1/4 model has a 600mm space between NGV and diffusor back side and it looks about right. No need to make it overly compact since I don´t have the length limitations that comes with a turbocharger turbine shaft. The NGV to combustor will have a simple slip joint fit. The more I play around with the scaled down model, the more surprised I will be once I have the real parts cut out and realise how damn big the engine will be. Cheers! /Anders
|
|
|
Post by Johansson on Dec 7, 2023 2:30:39 GMT -5
Hello guys! After doing some soul searching I have scrapped the laser cutting idea, it would save me oceans of time but in the end I´ll be the one building the engine damnit and not some soulless See-An-See machine. I will buy a pallet of aluminum and mild steel sheets and scribe and hacksaw my way through them. Being a man of principles is more a curse than a blessing. As a side note I am researching how to get a stationary phone installed in the house for when the 2G mobile network shuts down in a little over a year from now. I refuse walking around with a smartphone GPS tracker on me 24/7, and 99% of the calls is my feancee asking what we will eat for dinner so if we decide that at home I can do without a cellphone.
|
|
|
Post by pitciblackscotland on Dec 7, 2023 3:35:26 GMT -5
Hi Anders, WOW i haven't use one those rotary dial phones for many years now. Cheers, Mark.
|
|
|
Post by andym on Dec 7, 2023 16:33:45 GMT -5
Hello guys! After doing some soul searching I have scrapped the laser cutting idea, it would save me oceans of time but in the end I´ll be the one building the engine damnit and not some soulless See-An-See machine. I will buy a pallet of aluminum and mild steel sheets and scribe and hacksaw my way through them. Being a man of principles is more a curse than a blessing. As a side note I am researching how to get a stationary phone installed in the house for when the 2G mobile network shuts down in a little over a year from now. I refuse walking around with a smartphone GPS tracker on me 24/7, and 99% of the calls is my feancee asking what we will eat for dinner so if we decide that at home I can do without a cellphone. Would not see using new tech as soulles.... still plenty of hands on, i have had to learn plenty to build my engines, hours at my mate work shop, learning code... designing parts that work.... My heart and soul goes into it.... As I am sure you will.... laser cutting is a tool.... an aid.... am plenty sure you will put your blood & sweat into it..... if you want to be a purest..... use only hand tools, no angle grinder.... no cordless drills..... The laser cutter is not going to roll or band the sheets for you. Which ever way you go, I am sure it will be epic, enjoy what your doing.... we put a lot of time into what we make, and plenty amount of money..... if you not enjoying it.... why else do it
|
|
|
Post by Johansson on Dec 8, 2023 0:32:39 GMT -5
Hi Andy! Didn´t intend to take a dump on your beautiful work with the CNC-rant, it is mostly because I want to be in charge of the project and not have to sit on my hands waiting for the CNC guy at work to have time to help me out. He he, going full retard and building it with no power tools would be awesome. I imagine me sitting Thai style in underwear and flipflops in front of the house hammering a compressor cover into shape from a section of oil drum. Cheers! /Anders
|
|
|
Post by andym on Dec 8, 2023 6:42:50 GMT -5
Hi Andy! Didn´t intend to take a dump on your beautiful work with the CNC-rant, it is mostly because I want to be in charge of the project and not have to sit on my hands waiting for the CNC guy at work to have time to help me out. He he, going full retard and building it with no power tools would be awesome. I imagine me sitting Thai style in underwear and flipflops in front of the house hammering a compressor cover into shape from a section of oil drum. Cheers! /Anders LOL.... now that would be a site to behold..... I can understand the waiting.... its hard sometimes.........sometimes you just want to get on, have control of the project..... I am a very lucky guy to have a friend willing to do the cnc work.... we brought the materials last year..... been a long wait, but have used time to get the chassis done, flames soon I hope..... I am so looking forward to seeing your progress,
|
|
|
Post by Johansson on Dec 9, 2023 5:54:38 GMT -5
LOL.... now that would be a site to behold..... I can understand the waiting.... its hard sometimes.........sometimes you just want to get on, have control of the project..... I am a very lucky guy to have a friend willing to do the cnc work.... we brought the materials last year..... been a long wait, but have used time to get the chassis done, flames soon I hope..... I am so looking forward to seeing your progress, Yup, and this is a project that isn´t that much more difficult to make by hand. A large billet engine would be impossible to mill/cast for me, but a sheet metal engine just takes time and effort to make. Yesterday I ordered a sheet of 3mm aluminum, a couple of 1.5mm mild steel sheets and one 1.5mm stainless. I will order bearings, material for the shaft and some more stuff later this weekend and start making room for the project in the workshop. I can´t wait to get started on the project!
|
|
|
Post by Johansson on Dec 10, 2023 9:06:56 GMT -5
Do you think that a 60mm solid steel shaft is thick enough? It will be around 600mm between the bearings, and I don´t want it to start oscillating when rotating.
Making a larger diameter hollow shaft is one heck of a job so I will try a solid one first.
The bearings will be SKF 6010-2Z for a 50mm shaft, the idea is to turn the 60mm shaft down to 50mm where the bearings will be. That leaves enough of an edge for the bearings to seat against.
|
|
richardm
Senior Member
Joined: June 2022
Posts: 261
|
Post by richardm on Dec 10, 2023 11:32:00 GMT -5
You may want to look for a seamless hollow tube. Perfectly smooth inside with a consistent wall thicknes.
|
|
slittlewing
Senior Member
Joined: November 2017
Posts: 458
|
Post by slittlewing on Dec 11, 2023 16:21:49 GMT -5
Hi Anders 60mm should be pretty solid! I don’t think you need to go to the effort of a hollow shaft unless weight is going to be an issue for you. The calcs for bending stiffness are on page 7 below, you could get an equivalent bending stiffness with 68mm shaft and 8mm wall but it’s a huge amount to bore out on a big lathe! It is possible to buy hollow bar stock with decent thickness but might not be cheap? ocw.tudelft.nl/wp-content/uploads/Materiaalkunde_1_slides_chapter5.pdfCheers Scott
|
|
|
Post by Johansson on Dec 12, 2023 10:40:52 GMT -5
Thanks for the pdf Scott!
Weight is not an issue, and making a perfectly centered hole through a 1000mm long shaft is a major undertaking. Since I will use a cone clamping element to fasten the wheels to the shaft it needs to be pretty solid so it won´t flex or distort when torqued down properly.
I´ll give the 60mm solid shaft a go then, if I experience shaft vibrations during the test runs I have the option to make an alloy sleeve or something like that to beef up the section between the bearings. Hopefully I won´t need to.
Cheers! /Anders
|
|
richardm
Senior Member
Joined: June 2022
Posts: 261
|
Post by richardm on Dec 12, 2023 16:44:31 GMT -5
|
|