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HomeAircraftHelicopterHelicopter Main Discussion › How trex parts are made
06-06-2009 07:16 PM  9 years agoPost 1
ofir

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tel aviv - israel

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It looks to me like the trex 700 washout arms are not CNC made but kind of cast aluminum that was drilled. what do you think?

the main grips seems like a cast too that was proccesed by CNC later and not made from a square blind block.

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06-06-2009 07:19 PM  9 years agoPost 2
TankDirt

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Illinois

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If thats the cheapest way then thats how they did it.

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06-06-2009 07:28 PM  9 years agoPost 3
krashtagain

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ohio

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CNC made
Look up that process then make your statement .

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06-06-2009 07:28 PM  9 years agoPost 4
Jeff polisena

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westpalmbeachflorida usa

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I think if they were CNC they would cost more. They use a different anodizing it seems too . I guess this keep costs down

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06-06-2009 07:30 PM  9 years agoPost 5
Gyronut

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Martinsville In.

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Theres nothing wrong with using a CNC machine to wip a casting into shape...

Just as good...

Rick

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06-06-2009 09:50 PM  9 years agoPost 6
Furious Predator

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Kitchener, Ontario, Canada

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Theres nothing wrong with using a CNC machine to wip a casting into shape...

Just as good...
agreed. a LOT of mass production parts are cast into a rough shape before being tossed into a CNC machine.

this cuts way down on material costs and scrap.

Shawn
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06-06-2009 09:53 PM  9 years agoPost 7
DKNguyen

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That's how they make those giant freighter ship propellers too. Imagine all the excess material and difficulty extruding a chunk of nickel aluminum bronze that massive! ANd then having to mill away most of it!

But I think that extruded parts are stronger than casted parts though because the grain runs in the same direction, whether or not either part is milled afterwards or not.

http://upload.wikimedia.org/wikiped...p-propeller.jpg

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06-06-2009 09:58 PM  9 years agoPost 8
Furious Predator

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Kitchener, Ontario, Canada

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i actually had the chance to take a tour though a casting shop. they were busy making engine parts for the M1 Abrams tank, as well as ship props.

the props would start off as a massive rough sand cast. but it would be slowly milled and polished down with grinders. these props that i saw were about 10 feet in diameter or so.

its impressive stuff. We never got to see them actually pour a cast though. they only run up the ovens at night when the electricity is cheaper. so the castings are cooling down and get refined during the day.

Shawn
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06-06-2009 09:59 PM  9 years agoPost 9
DKNguyen

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What's even more impressive than that they friggin' STRETCH the propeller hole to mount it onto the shaft and let it snap into place. No bolts, set screws, threads or welds! NOthing!

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06-06-2009 10:04 PM  9 years agoPost 10
Furious Predator

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thats something i would love to see get done.

Shawn
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06-06-2009 10:09 PM  9 years agoPost 11
Sonic88

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Murfreesboro, TN

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And I though removing a one-way bearing was tough. Imagine trying to get that thing off haha!

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06-06-2009 11:04 PM  9 years agoPost 12
GREYEAGLE

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Flat Land's

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Stretch a hole ??
Actually its a shrink fit, based upon the diameter of the shaft and the bore size of the hole.

Tolerence of fit is determine by the temp of the bore in it's expanded state. The shaft is machined to a custom size. The bore is allowed to cool around it- which may take day's.

Largest I've been involved with is a 48 " shaft X 120" . The tolerence of shrink and recipe is somewhat propriatary upon the trade and will not be found in your typical machinest bible.

The fit is so tight you'd' never press one out - even on the small 4" stuff. But they are removable To see that being done - is really something to see.

greyeagle

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06-06-2009 11:31 PM  9 years agoPost 13
DKNguyen

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THe show I was watching said they used hydraulics to stretch it rather than temperature expansion. Personally, I couldn't figure out how you would stretch it evenly with hydraulics or how and where you would grab on.

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06-07-2009 02:17 AM  9 years agoPost 14
Dr.Rivet

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Seattle, WA, USA

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interference fit ship propeller
http://books.google.com/books?id=Qr...num=6#PPA506,M1

pages: 506-507

It's marine structural engineer's propeller bible at about $180.

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06-07-2009 02:22 AM  9 years agoPost 15
Dr.Rivet

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Seattle, WA, USA

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And to answer the main question, most Align bling is cast crappy aluminum alloy with subsequent CNC. I'm pretty sure even Chineese do not know what kind of alloy it is. It's just whatever a guy next door boils up in a pot

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06-07-2009 04:12 AM  9 years agoPost 16
TMoore

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Cookeville, TN

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I can't comment on merchant marine vessels but I can tell you that until recently, U.S. Naval submarines and surface craft shaft to propellor fits were hand scraped to master tapers. I used to do it for a living.

TM

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06-07-2009 05:05 AM  9 years agoPost 17
zaw

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Lebanon, NH - USA

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CNC mean it been processed/polished in CNC milling machine. You can put anything in those CNC machine, wood, plastics, crappy metal you casted in basement etc with right configuration/bits and programming.

should be after type of materiel the stuff is made with.

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06-07-2009 06:17 AM  9 years agoPost 18
EVO76

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New York , U.S.A.

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zaw is correct..I run a CNC machine for a living. I work for a company that builds the timing systems for most of today's vehicles.

Its stupid simple to polish crappy castings to a near mirror finish..we can hold a tolerance of 1 micron...sorry, thats a quarter of a HUMAN hair!!!

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06-07-2009 06:23 AM  9 years agoPost 19
TMoore

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Cookeville, TN

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Its stupid simple to polish crappy castings to a near mirror finish..we can hold a tolerance of 1 micron...sorry, thats a quarter of a HUMAN hair!!!
A human hair is around .004", a quarter of that is .001". That's a lot bigger than a micron.

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06-07-2009 06:27 AM  9 years agoPost 20
EVO76

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New York , U.S.A.

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a sheet of paper is also .004", so yes, its a heck of alot smaller.

25 microns is .001" I guess thats how I should've written it!! sorry!

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