jedax
New Member
Joined: September 2013
Posts: 8 
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Post by jedax on Sept 25, 2013 15:42:42 GMT -5
   ![]() I am planning to build an GR180 turbojet engine designed by gerald rutten. As you know the compressor wheel should fit in intake with very tiny tolerances. I am not experienced on metal machining but friend of mine is.But we dont have any cnc machine ,we only have manuel versions of many kind of metal machining machine.So my question is how am I supposed to make the fillets on the intake part. ![]() ![]() |
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gidge348
Senior Member
Joined: September 2010
Posts: 426
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Post by gidge348 on Sept 25, 2013 19:43:54 GMT -5
There are a few ways to do this. 1. Cut out a card template of the shape you want then rough out the shape using the lathe then when you are close use a file in the lathe to finish it. 2. Grind a tool to radius you want and just dive straight in. 3. Have a look at John & Marks posts on jetandturbineowners.proboards.com/thread/371/skuld-666?page=5 for a tool to do the job. Regards Ian... |
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rythmnbls
Veteran Member
Joined: August 2011
Posts: 145
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Post by rythmnbls on Sept 26, 2013 11:46:28 GMT -5
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jedax
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Joined: September 2013
Posts: 8
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Post by jedax on Sept 26, 2013 23:24:09 GMT -5
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jedax
New Member
Joined: September 2013
Posts: 8
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Post by jedax on Sept 27, 2013 9:27:00 GMT -5
steve!! what the hell.Are you a machiner at General electric aviation or what ?you even build the turbine and nvg yourself!! I am listing all of my question on my next post let me collect them.Really what is your job you even build your own ECU .are you running any gasturbine firm:))? |
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rythmnbls
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Joined: August 2011
Posts: 145
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Post by rythmnbls on Sept 27, 2013 9:51:31 GMT -5
Thanks for the compliments, I'm not running any GT firm,  . I'm just a hobbyist. Most of the construction techniques shown in my thread were pioneered by members of the GTBA so I'm just following in their footsteps. The NGV build method was first posted by Gerald Rutten on the GTBA forums and the turbine wheel was posted by Martin Stouten, these guys deserve most of the credit. The "ECU" is an Arduino chip programmed to measure RPM and EGT temps, it doesn't have any management capability. Looking forward to your build. Regards. Steve. |
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Post by turbochris on Sept 27, 2013 9:56:35 GMT -5
Martin Stouten is a bad ass! that little pulling tractor is insane!
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jedax
New Member
Joined: September 2013
Posts: 8
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Post by jedax on Sept 27, 2013 12:51:31 GMT -5
well ECU is the my favorite part since I am very confident about my both Arduino and Matlab programming skills. Thankfully These platforms are capable of working together which makes it perfect.But my Metal machining experience is limited.But I have a "body".You know what I mean.
I am going the start within 2 week But the thing I concern about the Compressor casing.I do not think we can manage 0.1mm clearence. so can I use
turbocharger's original compressor housing and trim the extras ?
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Post by Johansson on Sept 27, 2013 15:10:26 GMT -5
Martin Stouten is a bad ass! that little pulling tractor is insane! Anyone in contact with Martin? It would be wonderful if he was interested in joining up here and post the tractor build, when I was a member of GTBA it was one of the more interesting threads there. Unfortunately the GTBA forum was about as active as a dead horse so I didn´t bother to renew the membership. |
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Post by racket on Sept 27, 2013 19:52:38 GMT -5
Hi Jedax
You should be able to make the compressor housing ...............we'll talk you through the process :-)
Turbo housings generally have very generous clearances to account for "manufacturers tolerances" as well as potential bearing wear and rotor deflection over its extended life of many thousands of hours , unlike an RC turbine engine .
Get yourself a chunk of alloy :-)
Cheers
John
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jedax
New Member
Joined: September 2013
Posts: 8
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Post by jedax on Sept 28, 2013 1:02:52 GMT -5
Hi Jedax You should be able to make the compressor housing ...............we'll talk you through the process :-) Turbo housings generally have very generous clearances to account for "manufacturers tolerances" as well as potential bearing wear and rotor deflection over its extended life of many thousands of hours , unlike an RC turbine engine . Get yourself a chunk of alloy :-) Cheers John john I see. It appears my nails need to taste iron more than I think . One more question. If I choose a costom compressor wheel which is outside of the plans (And I will). What do you suggest to take out blueprints to build inner casing.Thank You. |
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jedax
New Member
Joined: September 2013
Posts: 8
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Post by jedax on Sept 28, 2013 1:32:04 GMT -5
Martin Stouten is a bad ass! that little pulling tractor is insane! Anyone in contact with Martin? It would be wonderful if he was interested in joining up here and post the tractor build, when I was a member of GTBA it was one of the more interesting threads there. Unfortunately the GTBA forum was about as active as a dead horse so I didn´t bother to renew the membership. In fact I am also member of GTBA but I just like to read over there.There Are many info  |
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Post by racket on Sept 28, 2013 4:27:53 GMT -5
Hi Jedax
Even with a custom wheel its still possible machine the parts , I have no idea what the compressor profile of my SKULD 666 engine is but I was still able to get a compressor shroud profile that was within reasonable clearances over quite large areas and distances .
I'm having problems with your comment ....."What do you suggest to take out blueprints to build inner casing" ..............translation maybe ??
Cheers
John
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jedax
New Member
Joined: September 2013
Posts: 8
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Post by jedax on Sept 28, 2013 11:19:55 GMT -5
Hi Jedax Even with a custom wheel its still possible machine the parts , I have no idea what the compressor profile of my SKULD 666 engine is but I was still able to get a compressor shroud profile that was within reasonable clearances over quite large areas and distances . I'm having problems with your comment ....."What do you suggest to take out blueprints to build inner casing" ..............translation maybe ?? Cheers John john As you understand I am not a native speaker. When I say "take out the blueprints" I mean "to get a compressor shroud profile" as you sad.Because dimensions are changing from top to the bottom (of compressor).So should I measure every diameter per 0.25 mm to get shroud profile. |
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Post by racket on Sept 28, 2013 17:41:46 GMT -5
Hi Jedax
Do you intend to redesign all of the GR180 parts to accommodate the >20% extra flow from the GTX35 comp wheel , the inducer of the GTX35 is much bigger than the GR180 wheel of ~56mm , you'll need a different flametube , NGV and turbine wheel .
Cheers
John
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. I'm just a hobbyist. Most of the construction techniques shown in my thread were pioneered by members of the GTBA so I'm just following in their footsteps. The NGV build method was first posted by Gerald Rutten on the GTBA forums and the turbine wheel was posted by Martin Stouten, these guys deserve most of the credit. The "ECU" is an Arduino chip programmed to measure RPM and EGT temps, it doesn't have any management capability. Looking forward to your build.
