richardm
Senior Member
Joined: June 2022
Posts: 413
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Post by richardm on Mar 25, 2024 5:19:38 GMT -5
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Post by Johansson on Mar 26, 2024 0:11:42 GMT -5
My guess is that it is heat distorsion, tensions in the castings letting go or a combination of both.
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Post by Johansson on Mar 26, 2024 15:07:30 GMT -5
I decided to fix the turbine blade clearance tonight, started off with the air grinder in the tool holder but I soon realised that this will take ages. What to do, what to do? I need a bigger grinder....  Worked like a charm, I used a crowbar to adjust the sanding belt pressure on the blades while grinding.  I set the tip clearance to 1.3mm, judging from the looks of it I don´t think I should open it up much further. No more work on the engine before Easter, the weather will be crappy but it will still be a cosy weekend in the cabin with the kids. Cheers! /Anders |
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richardm
Senior Member
Joined: June 2022
Posts: 413
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Post by richardm on Mar 26, 2024 15:23:43 GMT -5
Need a bigger grinder...Telle us you found it in tour tool box LOL
That picture! Work of art ! Bravo!
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Post by racket on Mar 26, 2024 16:50:09 GMT -5
Precision grinding , nice :-)
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Post by enginewhisperer on Mar 26, 2024 16:50:29 GMT -5
you need an abrasive NGV ring so the turbine can clearance itself  That would be nice, perhaps add a diamond dust coating to the blade tips so they wear a track for themselves in the metal. I've seen some turbos with a nylon wear surface in the compressor housing to allow them to self clearance. Might be a bit harder to do on a turbine! |
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Post by andym on Mar 27, 2024 2:53:45 GMT -5
Very impresive..... so looking forward to seeing this run..... |
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Post by Johansson on Mar 27, 2024 15:57:16 GMT -5
I've seen some turbos with a nylon wear surface in the compressor housing to allow them to self clearance. Might be a bit harder to do on a turbine! I don´t think nylon is the material best suited for the turbine stage.  But some spray coated porous ceramic material might work. Thanks for the kind words guys, redneck machining at its finest. *LOL* |
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Post by Johansson on Apr 1, 2024 13:47:52 GMT -5
The ignitor that Andy built for me arrived this weekend, I tested it just now and holy smokes does it give nice sparks! With the uneven spark pattern that I love from "real" gas turbines, awesome! Thanks a lot Andy for helping me out.
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Post by andym on Apr 1, 2024 14:15:10 GMT -5
Happy to help...... remember, push button control ..... ..... so looking forward to seeing yours run,,,, am off to track next week |
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Post by Johansson on Apr 7, 2024 15:27:43 GMT -5
The workshop is almost empty at the moment, I will get a nice upgrade in machinery tomorrow so I have had to make some space. Stay tuned... |
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Post by Johansson on Apr 8, 2024 14:13:20 GMT -5
I upgraded my mill today, for years I have been eyeballing a SAJO UF52 duomill with a drill press style mill head and when I found one for sale that was not on auction (I hate auctions) I just had to buy it.  It is more than twice the size of my old mill so I have to rearrange the workshop quite a bit, but I think it will be great when I am finished. The hydraulic press, the rollers and some other stuff that I don´t use very often will be placed in the cold shed.  So bear with me until I have everything in order, it will take a couple of weeks before I can continue building my jet engine. Cheers! /Anders |
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Post by racket on Apr 8, 2024 15:47:21 GMT -5
Hi Anders
You're getting some seriously gear in your workshop , nice :-)
Cheers
John
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Post by Johansson on Apr 29, 2024 14:34:43 GMT -5
Hi guys! I had to pause the build for a couple of weeks to get the workshop sorted out and some house overhaul done, now the mill is installed and test run. A really nice upgrade!  When the workshop was emptied I decided to build myself a proper welding bench, instead of the crappy one on wheels I had before. I made one from a 1000x1000x15mm steel sheet so it is plenty sturdy. I bolted the sheet metal bender, a mechanical press and a small vice to it, and added a shelf underneath for the welders and filler material.  A good thing about this is that the old welding bench frame can be made into a nice rolling engine stand, that is my next step on the engine project.  Cheers! /Anders |
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Post by racket on Apr 29, 2024 17:01:58 GMT -5
Hi Anders
Now thats one very nice mill :-)
Lotsa handles and knobs, a versatile machine , heh heh , nothing will be beyond you now .
15mm plate , you'll be able to bash things on that without worrying about denting it or bouncing around , I like your vice mounting on the corner , lots more clearance for those awkward jobs .
LOL...you might need a bit more bracing on the new test stand once the beast is at full power ;-)
Cheers
John
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