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carbon fiber vs. kevlar

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Old 05-31-02, 06:48 PM
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That CNC is huge bro... Man we have a tiny, 4x3 and its as old as wooden ships.. I dont use it, due to most of my cuts/receses are not that deep. I do it usually all by hand, I havent had to do anything at exact specs yet, just my specs. I mean if I had on that went 16 feet, I might look into it, most of everything I work on is at least 10 feet, or round.. It sucks... I will try to get some pics.....
Old 05-31-02, 11:45 PM
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Originally posted by Bigus Dickus
This is a large gantry 5-axis CNC mill doing the rough cut on the mold used to make the case. It's an Arboga mill... something like 16 feet travel in the x direction, thirtee feet or so y, and a few feet z.
That looks like a wood-only mill.&nbsp Can it do metal too???&nbsp Who the hell cares about wood mills - metal mills cost tons more money (well, I dunno about 16' x 13' travel though!) and a lot more applicable for automotive applications...



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Old 06-01-02, 12:11 AM
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It can machine metal, but why? Who needs a fifteen foot long metal mold?

An Arboga isn't used to make little steel and aluminum parts, although it could if you wanted it to (just a waste of resources). It's used for making wing molds, body molds... in our case a gearbox mold. Most of the molds this particular mill cuts are either wood, foam, Renwood, fiberglass, or the occasional steel wool/resin mold.

This particular machine was also outfitted with a force feedback sensor on the head to do precision mold polishing. After a composite mold is rough cut, sanded, and painted, the Arboga with feedback can do a final polish back to within .002" of the desired mold surface. Not bad over a dozen feet.

There were rumors that this particular mill had been used in one stage of the Hubble telescope primary mirror grinding or polishing (and why it was equipped with the force feedback). I'm not sure if that was ever comfirmed or not, but it was purchased from the government.

I guess the short answer to your question though is yes. If you really wanted to (and actually found a need to), you could make a 16' x 13' billet steel or aluminum part with positive and negative draft angles. No, this was certainly not a cheap machine.
Old 06-01-02, 12:17 AM
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BTW, when you say not applicable to automotive needs... think about how nice it would be to rather easily make any mold for composite body panels you needed.
Old 06-01-02, 07:47 PM
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Sure, I'd take a one-off custom aluminum side housing with CNC ports please!


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Old 06-02-02, 09:24 AM
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Originally posted by RETed
Sure, I'd take a one-off custom aluminum side housing with CNC ports please!


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