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Post by jetjeff on Feb 28, 2021 6:36:56 GMT -5
Hi John, This will be interesting,,,building a turbine large enough to power an ultralight is a "for retirement" dream of mine. Any thoughts on a U shaped combustion chamber (similar to the Williams WR2 design)? Or a combustion chamber that sits aft of the turbine wheel (similar to the Swedish PAL design)? It seems with using the standard turbocharger shaft, you're constantly fighting complete combustion with such a short combustion chamber. I know you like bronze bushings, but this will require a heavy battery (or multiple batteries?)to drive the oil pump. I have a Williams turbine wheel, possibly from an F-107 engine. Regards Jeff
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Post by jetjeff on Feb 9, 2021 16:59:18 GMT -5
Hello,
Building a self contained turbine, is no easy task.
I have Turbine wheel and N.G.V. blanks for sale in the 85+ mm range. I'm willing to sell them for a lot less than I advertised in this form, just to see somebody else have a use for them.
Regard
Jeff Pittel
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Post by jetjeff on Nov 9, 2020 4:03:10 GMT -5
Hi Patty,
A Hardinge Super Precision toolroom lathe, with a skilled machinist should be able to keep concentricity < .001". The best I could do with my Emco Super11 was roughly .0015" (with 3 jaw chuck).
Regards
Jeff
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Post by jetjeff on Oct 26, 2020 3:02:42 GMT -5
Hi Patty,
What is the shaft made from?
Regards
Jeff
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Post by jetjeff on Oct 24, 2020 3:12:14 GMT -5
Hi Patty,
I've never seen a rotor setup with preload on both bearings. I'm wondering if machining the inner race on one and outer on the other causing an imbalance of the bearing itself? Whats the surface finish on the machined areas of the bearings?
Your wave washer may not be providing enough "travel" when the rotor gets up to temp.
I might forego the compressor end preload altogether and substitute one of the flat washers, on the turbine end to use two wave washers in this sequence SlS.
Regards
Jeff
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Post by jetjeff on Oct 23, 2020 13:49:30 GMT -5
Hi Patty,
Supporting the shaft on V blocks at the bearing journal and checking the center of the shaft with a dial indicator, is one way. If you don't have the V blocks a local machine shop should be able to check it for no cost.
Regards
Jeff
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Post by jetjeff on Aug 24, 2020 15:43:29 GMT -5
Hi John/Ron,
I'm 59 and can still windsurf, iceboat and work harder than most millennials (thank God). The opioid crises in the US, has delegated most doctors to prescribe only at end of life situations, although when I threw my back out, I was screaming in pain.
Yes, we can give armchair advise to the new people about what will work, and what won't, the joys of having grey hair.
What's apparent in the manufacturing environment, and in home tinkering with turbines, once we are gone there won't be anybody to replace us.
Regards
Jeff
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Post by jetjeff on Aug 24, 2020 3:10:07 GMT -5
Hi John,
I've "tweaked" my back twice and know how painful it can be. Hang in there, surgery an option?
Regards
Jeff
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Post by jetjeff on Jun 5, 2020 16:12:06 GMT -5
Hi David,
WAY TO GO!!,,,congrats.
Jeff
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Post by jetjeff on Apr 18, 2020 9:10:58 GMT -5
Hello,
When you say Axial-Flow, are you referring to the compressor or turbine? Most R/C turbines use turbocharger wheels for the compressor and an axial turbine wheel, although some folks have used radial turbines for the hot end.
Yes, it is difficult to make without knowing your machining ability and machines you have access to. Although there aren't a lot of parts to a R/C turbine, they have to be made very accurately.
Regards
Jeff
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Post by jetjeff on Apr 13, 2020 16:34:50 GMT -5
Hi John,
I'm somewhat of a recluse myself.
Strange turn of events, but the guy responsible for milling the ventilator parts has come down with COVID19 himself and is in the hospital. I was sent home from work today as a precautionary measure.
Stay safe everyone.
Regards
Jeff Pittel
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Post by jetjeff on Mar 26, 2020 16:04:44 GMT -5
Hey Guys,
Thought I'd share an interesting blurb at work. I work at Blevins Screw Products in Flint Michigan. We make jet engine spray nozzles (one of only 4 machine shops in the US that do this), among other parts.
We now are machining ventilator parts, as there seems to be a shortage of them and even the auto companies are being asked to do what they can to supply more. We are currently scrambling to write G code for these critical parts.
Stay healthy.
Regards
Jeff Pittel
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Post by jetjeff on Mar 22, 2020 1:40:25 GMT -5
Hi Jason,
I don't have any seamless tubing in that size.
Regards
Jeff
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Post by jetjeff on Mar 21, 2020 13:41:42 GMT -5
Hi All, I'm offering N.G.V. + Turbine wheels blank kits for sale. Material is 304 stainless for the outer and inner shroud (.065" thick walls), 321 stainless .035" thick for the NGV blades (16 supplied, 15 needed) milled square. 347 stainless for the inner ring and 347 stainless .250" thick for the turbine blank. The outer ring that mounts to the outer case also provided. The turbine wheels have .312" holes bored, have been thickness machined per Kamps plans except I left a raised ring .125" for grinding for balance. The inner ring has been Dykem blued and scribed for the 65 degree entrance angle and 30 degree exit angle. The turbine blanks have been Dykem blued and scribed for 19 blades. Blade length will end up around .500". I also have a modular shaft tunnel which will need the flanges welded, but I've found it's easier to machine both bearing pockets using a small bore home type lathe (as long as your through hole spindle will accept 1.250" stock). I also have two smaller turbine disks one rough milled, no hole the other a Schreckling type wheel .125" thick. The three kits will have a finished turbine diameter of roughly 85, 87 and 89 mm. I highly recommend you have an experienced TIG welder, do the welds. I also have to add a disclaimer similar to the Kingtech one, I, Jeff Pittel accepts no responsibility for any injury you incur for parts that I've machined. Prices below would not include shipping. I'll gladly accept returns, but you'd have to pay shipping. I've never shipped anything across the "ponds", it may be cost prohibitive. Prices in US dollars. Pricing is: 85mm kit 250.00 (this kit has a welded stainless tubing 3.5" diameter outer shroud, which is not that concentric) 87mm kit 350.00 89mm kit 350.00 Shaft tunnel with flanges 150.00 (includes a bearing that is damaged, but suitable for machining the pockets to size) Kamps turbine wheel blank 347 stainless .250 thick rough milled no hole 75.00 Schreckling turbine wheel blank 347 stainless .125" thick blade slot have been cut 75.00 I am located in the US/Michigan Regards Jeff Pittel
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Post by jetjeff on Mar 16, 2020 14:33:53 GMT -5
Hello,
Where about are you located?
Regards
Jeff
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