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Post by Johansson on Nov 1, 2016 5:11:43 GMT -5
Very nice!
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Post by jetjeff on Nov 1, 2016 16:24:34 GMT -5
Thanks Anders. Attacking the thing with files to get rid of the milling marks and to thin the blades further. Jeff
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Post by jetjeff on Nov 3, 2016 0:48:38 GMT -5
Hi All, I turned the outer diameter of the compressor on the lathe to 4", the blades section will have to be turned down to roughly 3.625". I tried removing the machine screw that holds the compressor on, but I just start unscrewing the turbine from the shaft (running the engine several times have seemed to really tighten the compressor screw), I'm trying red loctite. Regards Jeff
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Post by jetjeff on Nov 7, 2016 2:24:53 GMT -5
Hi All, More progress on the new compressor. I'll have to machine a new front cover to exactly match the bevel I put on the blades. I did another test run of my Kamps engine last Friday, got the case pressure up to 1 PSI. Regards Jeff
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Post by jetjeff on Nov 7, 2016 16:52:35 GMT -5
Hi All, The nearly finished compressor,,,hopefully this one won't explode,,,running out of clean underpants,,,lol. Jeff
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Post by smithy1 on Nov 8, 2016 1:45:13 GMT -5
You wear underpants..??
LOL..!
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Post by jetjeff on Nov 9, 2016 3:27:01 GMT -5
Hi Smithy, LOL. I was able to balance the compressor wheel using a Dubro prop balancer (as best I could), by milling some material off the outer disk. It weighs .3 lbs, the same as the turbocharger wheel on my Kamps build. Regards Jeff
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Post by jetjeff on Nov 10, 2016 0:05:38 GMT -5
Hi All, Here is a pic of the new compressor on the engine. Working on machining a new front cover. Unfortunately, I have to disassemble the engine to get rid of the carbon fiber shards inside of the engine. Regards Jeff
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Post by jetjeff on Nov 10, 2016 3:44:56 GMT -5
Hi All,
Somebody has an Emco PC55 mill for sale on Craigslist. The add says sold without key or computer. Anybody know what it would take to get this running and if it's a good machine. I have an Emco Super 11 lathe, and I'm very happy with it.
Jeff
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Post by jetjeff on Nov 10, 2016 3:46:59 GMT -5
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Post by smithy1 on Nov 10, 2016 14:53:20 GMT -5
Hi Smithy, LOL. I was able to balance the compressor wheel using a Dubro prop balancer (as best I could), by milling some material off the outer disk. It weighs .3 lbs, the same as the turbocharger wheel on my Kamps build. Regards Jeff Nice work on the new comp wheel Jeff..... I'm not real sure the Dubro balancer will be good enough at the rpms these things spin at....You'll soon find out I suspect, I use 1mg-in limit on my smaller turbines and this gives a great result. On the larger ones I use 5mg-in. Even 10mg-in can, in some cases be detrimental to bearings/shaft. I balance all my engines as an assembly due to the fact that we are never able to put them back together exactly the same as they came apart. I think most Turbo places balance their rotatives the same way. I've done experiments where I balance an engine as an assembly.....pull it apart and reassemble to what I "think" is exactly the same and recheck the balance....most of the time it's not even close to being the same. Shaft/wheel orientation, torque settings call all vary by the smallest amount and will throw things out. On a turbo type engine with brass/bronze bushes it's not so bad as the oil cushion soaks up a lot of the inherent imbalance of the assembly. If you can feel the slightest buzz at idle rpms, it quickly manifests itself into silly vibrations at higher rpm...this will kill any engine in short order. Please be careful. I can balance your engine for you if you'd like....makes all the difference to the smooth running of an engine. There's no such thing as a "perfect" balance, however, the better the balance job, the less chance of things going awry. Cheers, Smithy.
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gtbph
Veteran Member
Joined: August 2013
Posts: 101
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Post by gtbph on Nov 10, 2016 17:37:03 GMT -5
Hi Jeff, That mill looks nice! Emco has been around for a very long time, my father bought an Emco mini-lathe about 25 or 30 years ago. I don't know how their current products are, but they surely have much experience. To get it running you need stepper motor drivers (if they are missing too), a power supply and something that generates the pulses for the drivers. The drivers are not that expensive. I bought some stepper motors from this shop: omc-stepperonline.com, they have drivers too. To make the pulses you can use a computer with a parallel port. I'm using a self-written controller program, but there are free programs out there, like linuxcnc.org. Not all computers are equally suitable, because some can output the pulses more "smoothly" than others. (I guess some spend too much time in interrupts). Steve ( rythmnbls) has experience with LinuxCNC, but he has not been active here for a long time, unfortunately. With this, you can send G-Code to your mill. To convert a geometry to G-Code you need some CAM software, but I don't know what's available, because I'm also using simple self-made programs to do this. Nice compressor wheel, by the way! Cheers, Alain
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Post by jetjeff on Nov 10, 2016 22:21:04 GMT -5
Hi Smithy,
Yeah I agree on the balancing. When I built my first Kamps build, I drove 6 hrs to a turbocharger repair facility. Keeping in mind I balanced the homebuilt turbine wheel on the same Dubro prop balancer, when we put my rotor on the turbocharger balancer, the guy said, if I had a rotor this far out of balance, I'd throw it away. After about an hour, we were able to bring the rotor pretty close in balance.
Hi Alain,
Thanks for the CNC info.
Jeff
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Post by jetjeff on Nov 12, 2016 8:01:19 GMT -5
Hi John, I've dissassembled the engine and was able to clean all the carbon fiber out(it was everywhere except for the bearings). I'm making a change to the two small bolts that hold the burner can to the compressor diffusor. John, how do the temp marks on the burner can look? I guess I make changes to the depth the flaps (inward wise) if you think it's warranted. Regards Jeff
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Post by racket on Nov 12, 2016 16:28:52 GMT -5
Hi Jeff
You've certainly got combustion from one end to the other, nothing seems overly hot , the flametube is a strange design with air entering mainly from the inner wall , do you have the standard fuel "coil" inside ?
Cheers John
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