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Post by Johansson on Jul 10, 2017 2:00:10 GMT -5
Hi all! The engine is finally 100% assembled (been waiting for some P2 gauge fittings etc) so hopefully I will have time to do a new test run sometime soon! A friend has told me he will drop by for the occasion so I´ll have him hold the camera for some in action footage.  Cheers! /Anders |
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Post by Johansson on Jul 9, 2017 16:37:48 GMT -5
Hi Gene! Ideally you want a turbo coming from a diesel engine, they tend to have a larger turbine section and therefore be more suited for a gas turbine than the "petrol turbos" with their generally smaller turbines. Read through this guys website and you will probably have most of your questions answered. www.rcdon.com/html/gr-1_turbojet_engine_project.htmlCheers! /Anders |
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Post by Johansson on Jul 9, 2017 16:31:58 GMT -5
Hi bonerici and welcome to the forum! What CH3NO2 is talking about is oiling ball bearings for micro turbines, a brass bearing turbocharger needs oil with normal automotive viscosity for the bearings to survive.
There are lots of info on the web on how to make your first turbocharger based gas turbine, for example check out rcon.com where Don has done an awesome job of documenting his gas turbine builds over the years.
Cheers!
/Anders
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Post by Johansson on Jul 5, 2017 23:00:29 GMT -5
Only hobby. There is little use for manual skills around here in the era of CNC machining and Chinese mass production, except perhaps for repairing a broken driveshaft on the neighbors lawn mover.
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Post by Johansson on Jul 5, 2017 14:27:30 GMT -5
I found time to get another of the small jobs done, keying the fan side of the driveshaft!  Here the key is in place.  Fits like a glove!  Now it was time to decide how to fix the fan on the shaft, I was reluctant to remove the drilled center at the shaft end since I might need it later. Eventually I decided on threading the end of the shaft and use a nut and a special washer to secure the fan.  Threading the shaft end after turning it down to 12mm.  Shaft end threaded and the key cut to length.  Assembled, the washer will get a taper and some other small touches later. I will also use a Nordlock washer behind the nut to keep it from coming lose.  Cheers! /Anders |
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Post by Johansson on Jun 26, 2017 14:40:22 GMT -5
Less guns and more turbines! I ground the fan hub center until it had a sliding fit on the turbine shaft.  Now I just need to mill a keyway slot on the shaft. Ehh, I might have a bit more work ahead of me than that....  Cheers! /Anders |
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Post by Johansson on Jun 22, 2017 3:10:18 GMT -5
I have a 10/22 and it empties the 10 round mags fast enough on semi auto... |
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Post by Johansson on Jun 21, 2017 23:16:59 GMT -5
Imagine this beauty fed with heavy 12ga slug rounds. Oops, sorry for going off topic... |
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Post by Johansson on Jun 21, 2017 23:04:28 GMT -5
Watch... in a couple years time, Anders will make the finest DIY turbine powered Gatling gun you ever saw. Take my word on it that if the Swedish gun laws weren´t the way they are I would have been building a 12ga shotgun Gatling right now. I´ve bought a book containing the original Gatling patent to study the inner workings, it is a mechanical marvel with the ramp controlled bolt and firing pin movement! |
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Post by Johansson on Jun 21, 2017 16:59:39 GMT -5
Thanks John! I´ve been a bit "off" with the turbine stuff lately since I´ve just discovered the joy of handgun shooting, luckily we only have an outdoor range so I will still have lots of workshop time during the colder parts of the year. |
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Post by Johansson on Jun 21, 2017 16:17:58 GMT -5
Finally the wave washers I ordered have arrived so I could continue working on the fan!  I didn´t take many pics of the job, but I started by making the rear bearing seat in the shaft tunnel. A stack of three wave washers behind the bearing gave slightly over 500N preload when compressed to 3/4 so I´ll try that and see how it works.  With the turbine wheel in place I could calculate how the fan side of the shaft tunnel would look like, here the bearing is seated both in the shaft tunnel and on the shaft.  It goes without saying that I had to test spin the turbine for a couple of minutes while making jet-like sounds....  Cheers! /Anders |
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Post by Johansson on Jun 20, 2017 15:03:10 GMT -5
Nothing is impossible as long as you are a stubborn bastard. |
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Post by Johansson on Jun 20, 2017 2:28:08 GMT -5
Congratulations!!!
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Post by Johansson on Jun 14, 2017 14:38:14 GMT -5
Thanks Anders. I will keep that in mind. I got a bit worried when I saw some sparks coming out the exhaust during the third test, it might be wise to check the turbine wheel inducer tips for signs of overheating. |
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Post by Johansson on Jun 14, 2017 12:03:45 GMT -5
Almost there, next time you´ll have it running! Good job! Just keep an eye on those temps during startup, it would be a shame to toast the turbine wheel/NGV. |
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