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Post by kraftt on Mar 28, 2017 19:52:19 GMT -5
Does anyone have a close up photo of the underside of an F-AFO ?
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Post by aas on Mar 28, 2017 20:52:35 GMT -5
Of the vac attachment or the sliding stainless cut-off part?.. Google has some images. (sorry, I don't!)
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Post by kraftt on Mar 29, 2017 0:08:36 GMT -5
Bottom side of this guy:
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Post by aas on Apr 3, 2017 1:49:40 GMT -5
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Post by kraftt on Apr 3, 2017 10:12:49 GMT -5
aas - Great, thank you so much. Seeing it, it's not at all what I expected to find. Does offer some good info though and gives me many options to think about. Appreciate it. *Question: do the reenforcement barriers (blue arrows) have any holes in them or is air flow routed over these barriers? I take it that the brass washer screw is not an eccentric and simply tightens.(?)
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Post by toomanytoys on Apr 3, 2017 18:11:37 GMT -5
I'm doing my best "looking at Mars rover pictures analysis", although a side view of it would help. I ain't got one of these btw.
I believe the blue arrows point to the raised area that allows vacuum to be pulled through the track's channels. The red gasket seals against the product to be cut top surface. And I believe the brass circle is eccentric so as it fits within the track top surface it can clamp by side loading. This unit does afterall fit on the end of the track.
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Post by kraftt on Apr 3, 2017 22:02:21 GMT -5
Good heavens what's wrong with me... thanks toomanytoys I took the top side fluted channels (with the barriers) to be used to draw air when they're just support and on top of the track. (duh)
Yes, your description of air flow through the underside rail channels is obviously correct.
I did pick up on the novel clamping into top track but still unsure about the brass being an eccentric.
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Post by aas on Apr 4, 2017 0:15:37 GMT -5
The brass is not eccentric if memory serves me, it slides into the rail joiner groover and just lifts up when tightened. There is no reason for the area you marked with blue arrows to need vacuum, it sits on top of the rail, it's the open part to the right of the picture that provides vacuum to the rail. I think these are reinforcing ribs and provide no other purpose.
I'm 1000km away from the part now, not back for a month, so I can't take any more pics!
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Post by toomanytoys on Apr 4, 2017 6:59:46 GMT -5
So then it moves downward? Yeah, I could see that would be less prone to vibrating to a loose position.
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Post by aas on Apr 5, 2017 0:28:19 GMT -5
No, I think it is a standard thread and lifts up to lock the rear side of the connector channel.
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Post by toomanytoys on Apr 5, 2017 8:41:03 GMT -5
Ok, I'm getting pushed into my crumugeon side. It's not my fault. I don't see how the little tab on the end would handle the forces of clamping or the hose by themselves. I think the disc is an essentric and everything fits into the very specially designed groove up top. On one side there is a bottom groove and the other a dovetail, where I believe the essentric dovetails into. If we take a very very close look at the adaptor, it shows protrusions for each side of the groove with lead-in reliefs. Also the clearance support ring around the metal disc shows it essentric to the disc. The only reason to design it that way is if the disc moves in an essentric manner. But I concede it also might stay where it is and just moves up or down to lock into the dovetail if it extends into the dovetail no matter what, it's just not what my gut is telling me. Maybe it does both, essentric and changes plane. Attachments:
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Post by kraftt on Apr 5, 2017 9:59:53 GMT -5
I think it's the camera angle and shadow that makes it look eccentric. There's such little room for side to side movement with regards to the dovetail and bottom groove that one of them would risk not having enough bite if an eccentric moved them in one direction or other.
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Post by reflector on Apr 5, 2017 10:09:28 GMT -5
Thanks aas, The dealers etc. all told me it was a different track/rail even one who contacted mafell for me. But I could plainly see it was the same, I just got hung up on some posts saying they wished the track was longer, so it made me wonder why they didn't just swap vac parts onto longer track. My experiments using foam & a hillbilly vac attachment have been encouraging so far with regular F track and I wanted to make sure I wasn't missing something about any 'uniqueness' of the track supplied with Aero. So you've had luck with your experiments with a home made adapter so far? I noticed that the Aerofix rails have two metal plates on the bottom and supposedly you can't get suction to work if you join two rails together on the other rail (...Well, I can see that the joints will leak a little, but with enough airflow and static pressure it'd be better than no clamping, right? In thrust we trus-- I mean vacuum power).
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Post by kraftt on Apr 5, 2017 10:43:25 GMT -5
Yeah I'm inching towards a couple of 'things' but not ready to talk about any yet. (One, unrelated to Aerofix, is finished but I want to assess it for while.)
With the Aerofix I think it's best not to create too long a distance between F-AFD and either of hose to rail adapters.
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Post by reflector on Apr 5, 2017 11:13:19 GMT -5
Let me know if you need my help with CAD or a 3D printed part. I'm interested in where this goes.
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