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HelicopterMain Discussion › How trex parts are made
06-07-2009 06:31 AM  8 years agoPost 21
TMoore

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Cookeville, TN

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Let's be fair to everyone that is reading the thread too. Holding a micron on any CNC machine is an absolute impossibility. Even the best CNC machines are not built to the precision necessary to precisely position in this range.

TM

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06-07-2009 06:41 AM  8 years agoPost 22
EVO76

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New York , U.S.A.

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Really???? I run a surface grinder that WILL hold a 3 micron tolerance all day long. sorry if its hard to believe, but after a short warm-up ..it does it .! not trying to be a prick..just its my daily job!!

back to topic..

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06-07-2009 06:43 AM  8 years agoPost 23
TMoore

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Cookeville, TN

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3 microns isn't the same as 1 micron.

TM

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06-07-2009 04:02 PM  8 years agoPost 24
Jlerch

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Parrish, Florida

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From
http://www.nasatech.com/motion/appl...apps2_0209.html
These SiGNUM(TM) encoders provide accuracy better than ±1 μm, ±30nm cyclic error, and resolution down to 5nm/0.005 arcsec.
And while waving numbers around, in my link below you will see the method I used to fabricate surfaces to an accuracy 0.055 micron peak to valley, using only simple hand tools.

http://lerch.no-ip.com/atm

Sections 4 - 11

James Lerch - Tampa Bay FL

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06-07-2009 06:12 PM  8 years agoPost 25
smallplanes

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We turn small shafts on a Mori lathe and we hold .0002 all day.I run parts on a Mori mill and can hold a .001 all day every day so it''s on what kind of machine you have. If you have a Japanese machine you can do it if it's American you will be lucky to hold 1".


Spectra G 26cc
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06-07-2009 07:17 PM  8 years agoPost 26
TMoore

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Cookeville, TN

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We turn small shafts on a Mori lathe and we hold .0002 all day.I run parts on a Mori mill and can hold a .001 all day every day so it''s on what kind of machine you have. If you have a Japanese machine you can do it if it's American you will be lucky to hold 1".
Not all American Machine tools are a POS. Why don't you ask the Mori Dealer, which would be J&H BTW, who makes Mori's Crown Ground Curvic Couplings for their lathe turrets. I already know the answer.
From
http://www.nasatech.com/motion/appl...apps2_0209.html
These SiGNUM(TM) encoders provide accuracy better than ±1 μm, ±30nm cyclic error, and resolution down to 5nm/0.005 arcsec.
And while waving numbers around, in my link below you will see the method I used to fabricate surfaces to an accuracy 0.055 micron peak to valley, using only simple hand tools.

http://lerch.no-ip.com/atm

Sections 4 - 11
OK, make me a new OS piston for my 91HZ using your method.

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06-07-2009 07:40 PM  8 years agoPost 27
Jlerch

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Parrish, Florida

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OK, make me a new OS piston for my 91HZ using your method.
I can make the flat crown, and I can make the cylindrical exterior part with my method, but if you want a SPECIFIC diameter, yea not so much! ;-)

One joy of Newtonian telescope optics is it HAS to be a precision surface, but it doesn't have to be a specific precision surface, any parabola will do! :-)

I once tried to fabricate a surface with a specific radius, a specific conic, and to a specific precision. 1 of 3 was easy, 2 of 3 was hard, 3 of 3 proved damn difficult!

James Lerch - Tampa Bay FL

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06-07-2009 07:54 PM  8 years agoPost 28
TMoore

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Cookeville, TN

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That reminds me of being an apprentice and having to scrape 3 cast iron plates to make 1 good surface plate. We didn't scrape to a dimension but to a flatness spec.

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06-07-2009 08:13 PM  8 years agoPost 29
tadawson

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Lewisville, TX

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And here I am thinking that Align parts were made by monkeys with hammers beating on lead alloys . . . .

Live and learn . . . .

- Tim

Friends don't let friends become electrotarded . . . .

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06-07-2009 08:24 PM  8 years agoPost 30
nitro fun

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Oc ca

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hay my old lagon lathe will hold a thou. but it takes operator skill

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06-07-2009 08:49 PM  8 years agoPost 31
smallplanes

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Yes we got all our machines from J&H machine tools but all we bought we Mori's. We have 14 Cnc's 5 mills and 9 lathes and they will hold VERY close size all day every day. Or lets put it this way they will hold as good as the inserts will hold. Threading is the most difficult to hold due to insert wear. I'm sure theres good American machines out there i was just kidding a little. But as far as i know the Japanese have the best out there at this time. Years ago Americans made the best machines out there but they did not try to improve them any and thats where the Japanese took it to the next level. I wish Americans made machines that would hold and last like the Japanese do if they did thats what we would have bought. We have a small Cnc shop family owned and i was self taught i've never been to school for it but i'm a pretty good milling man my brother is the lathe guy in our shop. If you would like to take a look at our shop here is the web site http://www.simsmachining.com Lets put it this way theres nothing on a RC Heli that i could not make. I run castings some times and i hate them i would rather make it from a solid block of metal any day. All i can say is if Trex is casting parts there some of the best i have ever seen. There is no comparison to a casting up side a solid milled part.

Thanks


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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06-08-2009 05:37 PM  8 years agoPost 32
ofir

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tel aviv - israel

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And here I am thinking that Align parts were made by monkeys with hammers beating on lead alloys
Seems close enough...

My name is Ofir and I am a helicopters addict...

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HelicopterMain Discussion › How trex parts are made
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