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Post by jetjeff on Feb 7, 2015 8:09:00 GMT -5
Hello,
I'm building a small turbine that will rotate counterclockwise as viewed from the front. My question is both Kurt Schreckling and Tomas Kamps say BOTH ends of the shaft must be threaded counter clockwise in the Kamps case and clockwise in the Shreckling case. I think if the rotor turns counterclockwise the compressor end should be clockwise and the turbine end, counterclockwise. This is how a bench grinder secures the wheels. Thoughts?
Jeff
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rythmnbls
Veteran Member
Joined: August 2011
Posts: 145
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Post by rythmnbls on Feb 7, 2015 8:59:56 GMT -5
My Kamps spins clockwise when viewed from the front, the threads on both ends are lefthanded.
For a turbine that spins counter-clockwise when viewed from the front you should use right hand threads.
If you imagine the torque applied to the turbine wheel in either case it will tend to tighten the nuts as the load is applied, similarly for the comp wheels.
One of the worst things that can happen is a nut coming loose and unloading the rotor/wheels during operation, the instantaneous jump in RPM would be very destructive.
Regards,
Steve.
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Post by jetjeff on Feb 8, 2015 1:18:03 GMT -5
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Post by Johansson on Feb 8, 2015 3:45:33 GMT -5
Looking good! Welcome to the forum by the way!  |
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Post by jetjeff on Feb 8, 2015 10:47:17 GMT -5
I'm working on a grinding jig for the turbine wheel. I plan on at least grinding the concave blade surface prior to bending. Hopefully the jig will work better than profiling the turbine blades free hand. Jeff   |
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Post by Johansson on Feb 8, 2015 11:01:35 GMT -5
That is clever, I´ve seen a similar jig with a small belt sander that a german guy made for his home built Wren MV54 turbines that he powered a micro tractor puller with.
He had a built thread at the GTBA community forum, I used to be a member earlier but found the activity there too low to be worth the membership fee.
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Post by jetjeff on Feb 8, 2015 12:06:46 GMT -5
Thanks,,,still a long way to go.
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Post by smithy1 on Feb 8, 2015 14:52:39 GMT -5
I did a similar thing many years ago using Inconel...found it very difficult to get the profile correct. What size turbine wheel are you after?? I have a few here which are doing nothing..
Cheers,
Smithy.
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rythmnbls
Veteran Member
Joined: August 2011
Posts: 145
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Post by rythmnbls on Feb 8, 2015 19:41:30 GMT -5
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Post by jetjeff on Feb 9, 2015 8:04:58 GMT -5
The turbine diameter is 90.5 mm or 3.55". I'm using a stainless shroud (part number 11.4 in the Kamps blueprint) salvaged from my submersible water well pump that went bad. The tubing is seamless, much better than the 304 stainless exhaust tube I've used prior.
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Post by jetjeff on Feb 9, 2015 13:15:25 GMT -5
Steve,
Outstanding work!!! Especially like the balancer. Most turbocharger shops will not balance your rotor for I guess liability concerns. Did your engine run? The only thing that caught my attention was the blade length on your turbine wheel, how long are the blades?
Jeff
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rythmnbls
Veteran Member
Joined: August 2011
Posts: 145
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Post by rythmnbls on Feb 9, 2015 16:12:57 GMT -5
The engine ran just fine, a little hot due to the inefficiencies of the hand made turbine/NGV but well within specs. There should be some videos in the link posted earlier.
Blade length is 14mm, wheel dia is 75mm.
Regards,
Steve.
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