FOB stands for Freight On Board....FOB- Freight on Board (named port of
shipment) Means the seller completes his obligation to deliver when the
goods pass over the ship's rail at the named port of shipment.
Matt
----- Original Message -----
From: "SailplaneBoy" <[EMAIL PROTECTED]>
To: "Bonfiglio Tullio" <[EMAIL PROTECTED]>; "soaring list"
<[EMAIL PROTECTED]>
Sent: Friday, March 16, 2001 4:08 PM
Subject: Re: [RCSE] C.N.C.
> Hey,
> I found that CNC hot wire cutter I thought was $350. Wishful
thinking,
> I found the URL and it costs "600 $ us FOB Holland". Not being much good
> with acronyms, I was wondering what FOB stood for. This kit requires some
> assembly and circuit board assembly, but looks good. I wish the site had
> more information.
> http://www.cybercomm.nl/~fbreemen/foamcut.htm
>
> ----- Original Message -----
> From: "Bonfiglio Tullio" <[EMAIL PROTECTED]>
> To: "soaring list" <[EMAIL PROTECTED]>
> Sent: Wednesday, March 14, 2001 12:31 AM
> Subject: RE: [RCSE] C.N.C.
>
>
> > Date: Mon, 12 Mar 2001 19:21:53 -0500
> > From: Mark Drela <[EMAIL PROTECTED]>
> >
> > >I presume you're calculating the required wire length and driving
> > >a stepper to change the length? Wouldn't it be simpler to maintain
> > >a constant tension in the wire? This could be done by terminating
> > >the wire on a drum driven directly by a DC motor. The motor would
> > >operate stalled most of the time, with it's stall torque (and hence
> > >wire tension) controlled by the applied voltage.
> >
> > I would NOT get rid of the bow.
> >
> > The problem with anchoring the wire ends to the x,y traverses
> > is that they must now withstand the very substantial
> > wire tension. And when the wire is "swept" when cutting
> > a tapered wing, a significant component of the wire tension
> > must then be overcome by the stepper motors. This tremendously
> > increases the demands on the rigidity of the traverse frames
> > and the motor power compared to the external-bow design.
> > The wire tension is huge compared to the other loads.
> >
> > - Mark
> >
> >
> > I fully agree, of course, on the consideration about the increase on
> demand
> > of rigidity and motor power (Mark, as usual, is topmost clear !).
> > But, if you really want to keep on this road, if I understand well, you
> > could also consider to tension the wire by hanging one substantial
weight
> (5
> > Kg = 10 lbs.?) per side using pulleys. In this way only the structure
> should
> > be reinforced and the "complication" would be limited.
> > Anyhow I would stick with the bow, and a light one.
> >
> > Ciao from Italy.
> > Tullio.
> > Ing. Tullio BONFIGLIO
> > Ansaldo Energia
> > ICI/IMT/AUT - F12 / P5
> > Via N. Lorenzi, 8
> > 16152 Genoa - ITALY
> > Ph. : 39 (0)10 655 3267
> > Fax : 39 (0)10 655 3250 / 3894
> > E-Mail : [EMAIL PROTECTED]
> > RCSE-List facilities provided by Model Airplane News. Send "subscribe"
> and "unsubscribe" requests to [EMAIL PROTECTED]
> >
>
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