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HomeAircraftHelicopterHelicopter Main Discussion › Lets make this "Its CNCed" clear
09-04-2015 11:44 PM  3 years agoPost 41
wc_wickedclown (RIP)

rrProfessor

long beach calif

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i love plastic parts on a helicopter ,Plastic parts make the chopper so light makes my trex feel like the logo's

but the bad side,Light crashes plastic parts break easily

i prefer the cnc parts because most of the time only the shafts might bend
cnc parts are more durable then the plastic parts and can be ran at higher head speeds then the plastic parts.

Insha Allah made in america

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09-05-2015 12:04 AM  3 years agoPost 42
Aaron29

rrProfessor

USA

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Again, CNC =/= anodized aluminum. You can CNC a plastic part.

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09-05-2015 01:14 AM  3 years agoPost 43
TMoore

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Cookeville, TN

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The industry cuts lots of plastic parts on CNC's. If any of y'all ever had a knee replacement take a look at the UHMW plastic bearing that sitting between the two highly sculpted and polished pieces of titanium that were beaten into your distal femur and tibia or in the case of a hip replacement the pelvic bone and femur. Thank the scientist that came up with UHMW.

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09-06-2015 02:22 PM  3 years agoPost 44
G.Stone

rrApprentice

Thompson, Pa. USA

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Not a Heli, Not a hip, Not plastic, But it is some interesting machine work. I can't imagine doing this without a computer aided mill.

Watch at YouTube

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09-06-2015 02:54 PM  3 years agoPost 45
AirWolfRC

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42½ N, 83½ W

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I thought the idea of high performance bikes was to keep them light ?
Hardwood is not light.

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09-06-2015 05:33 PM  3 years agoPost 46
Life_Nerd

rrVeteran

USA

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Great for downhill as they show it...

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09-06-2015 06:13 PM  3 years agoPost 47
Dan Minick

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Columbus, WI

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I cant imagine WHY there is a market for a bike like that....

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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09-06-2015 08:33 PM  3 years agoPost 48
G.Stone

rrApprentice

Thompson, Pa. USA

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It's hollow and quite light. 9.5 lbs I think. Very strong. The price is scary part.

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09-07-2015 12:58 AM  3 years agoPost 49
Dan Minick

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Columbus, WI

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On their web page the road bike is shown at 18.5 lbs. Not a lightweight most carbons are under 15

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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09-07-2015 01:45 AM  3 years agoPost 50
G.Stone

rrApprentice

Thompson, Pa. USA

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I hear ya. Maybe just the frame is 9.5.
Anyway, I was just showing a CNC that would be very difficult without computer aid. So many tapers and non-constant radius.
All good stuff.

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09-07-2015 04:11 PM  3 years agoPost 51
classic

rrElite Veteran

All over the place!

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TMOORE,
Thanks for some very well stated and informative posts, and please don't think the rant of one person reflects what the rest of us think.

Which is worse, ignorance or apathy? I don't know and I don't care!

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09-09-2015 07:14 PM  3 years agoPost 52
MartyH

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USA

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Never heard of more than 5 axis but ok. As for CNC equating quality, from the first Thunder Tiger Raptor plastic part that I slid a precision bearing into back in the 1990's, it was clear that the engineering and execution in the form of a high quality injection mold could produce incredible quality. I like CNC pieces, especially in anodized aluminum but that in and of itself it not where the quality comes from.

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09-09-2015 11:59 PM  3 years agoPost 53
Gearhead

rrMaster

Vt

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from the first Thunder Tiger Raptor plastic part that I slid a precision bearing into back in the 1990's, it was clear that the engineering and execution in the form of a high quality injection mold could produce incredible quality. I like CNC pieces
funny you say that, the engine mount on my Raptor 30 was sO far off I had to shim the engine forward some .040" to center the clutch shoe inside the bell, but I liked the Raptor's plastic frame

Jim
Buzz Buzz Buzz

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09-10-2015 12:14 AM  3 years agoPost 54
AirWolfRC

rrProfessor

42½ N, 83½ W

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I'm surprised you had to shim anything. The surface of the mounts in the frame is on the center line of the shaft (or should be) and the bottom of the mounting tabs of the engine are on the crank shaft center line.

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09-10-2015 12:33 AM  3 years agoPost 55
Gearhead

rrMaster

Vt

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AirWolfRC, I agree, but just so you know, if it makes a difference, that was back in 2002, I posted about it a few times back then

Jim
Buzz Buzz Buzz

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09-10-2015 07:14 PM  3 years agoPost 56
MartyH

rrProfessor

USA

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Not to get lost in defending TT, but are you sure you had the right mount? I remember there was a set of aluminum shims that actually came with the mount that was about .040 thick. I don't remember the application though.

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09-11-2015 02:03 AM  3 years agoPost 57
Gearhead

rrMaster

Vt

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edited
are you sure you had the right mount?
all I can say is, that it did mount to my OS 32 and I didn't get shims in that kit

Jim
Buzz Buzz Buzz

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09-11-2015 03:22 AM  3 years agoPost 58
rcflyerheli

rrKey Veteran

Granbury, TX USA

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Maybe I am out of touch, since I went back to flying in 1980 and haven't done any design or manufacturing work since then, but it seems to me that the term CNC came about in the early 80s whereby we had dedicated programmers that would take an engineering drawing and basically write a program that was punched onto a tape and then fed into the mill/lathe, etc.

As the industry progressed, I seem to recall that it evolved into what I would now term DNC (direct numerical control) whereby the design CAD program used the applicable post processor to convert the engineering design directly into a tool path code that controlled the cutting machine.

Also, aren't injection molds now made using electric (electronic) discharge machine technology rather that CNC/DNC cutting technology?

Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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09-11-2015 03:49 AM  3 years agoPost 59
RM3

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Killeen, Texas - USA

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molds are made with any technology that suits the material and size of the workpiece. my father in laws shop uses EDMs to make molds from hardened tool steel among other metal alloys. Otherwise he uses a 6 axis milling center to cut the complex 3D profiles.
Now some CNC machines are so complex that they can be programmed to take into account tool wear and compensate accordingly...but your talking about some serious quality control standards.

If i recall the first NC machines were just that, numeric control and read the cutting routine from cards or tape...then came the computer that read a program stored on magnetic tape, disk, or now thumb drives, some even read directly from a remote server and run the drives for the axis and deal with the automatic tool changer and go as far as checking tool length offset automatically...

but as far as some of our models go, simplicity is best and tolerances should be kept tight where needed, but there is no point in having a side frame thats 0.0005 accurate lengthwise...

showing a preference will only get you into trouble, 90% of everything is crap...

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09-11-2015 05:37 AM  3 years agoPost 60
TMoore

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Cookeville, TN

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Maybe I am out of touch, since I went back to flying in 1980 and haven't done any design or manufacturing work since then, but it seems to me that the term CNC came about in the early 80s whereby we had dedicated programmers that would take an engineering drawing and basically write a program that was punched onto a tape and then fed into the mill/lathe, etc.
As the industry progressed, I seem to recall that it evolved into what I would now term DNC (direct numerical control) whereby the design CAD program used the applicable post processor to convert the engineering design directly into a tool path code that controlled the cutting machine.
Also, aren't injection molds now made using electric (electronic) discharge machine technology rather that CNC/DNC cutting technology?
DNC has a couple of meanings. Distributed Numerical Control and Direct Numerical Control. Both mean relatively the same thing, basically a means to transfer NC programs to the machine in chunks for machine tools with limited onboard memory. CNC stands for Computer Numerical Control, a logical advancement from NC which were dedicated control systems that ran from paper tape, magnetic tape or punch cards with no onboard memory.

As RM3 pointed out molds can be made from soft material and heat treated, then finished, hard milled from fully hardened material or EDM'ed with Sinker and Wire EDM machines. It all depends on the final geometry of the final product as well as what the shop has for spindle resources. Even back in the day of paper tape we used programming systems to create toolpath. I can remember programming Mills in APT and lathes in Compact II. The underlying math of all modern CAM systems is rooted in APT.

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