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Trish
Trish
7:17 AM
my granddad's wire cutter was just a metal C with a hot wire. Mounting that to an XZ moving frame makes you a hot wire router, but the C needs to be rotateable. Using 2 frames with the wire tensioned between two heads allows virtually free movement within the frame.
@Christoph With a particular tricky mounting on the "far" side (like some sort of spring-loaded mechanism?) one could auto-tension the wire, and possibly allow to angle the cuts on the moving machine...
 
Greenonline
Greenonline
7:52 AM
@0scar - WRT this answer, I don't want to censor the OP's thoughts so I'll leave the answer be, but if you could leave a comment stating why it isn't a particularly good answer (or is incorrect) then that would be great. Thanks.
 
 
7 hours later…
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
3:13 PM
^^ Great fun ... we'll see what the OP has to say about it. Figured I had enough in the comments to make an answer, might as well.
 
 
1 hour later…
Greenonline
Greenonline
4:30 PM
@Pᴀᴜʟsᴛᴇʀ2 - Are the comments to the question still required? Flag those which can be deleted, cheers :-)
 
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
@Greenonline - Done
I deleted mine and flagged the OP's
 
 
2 hours later…
0scar
0scar
6:14 PM
@Greenonline I have left a comment. I still believe this is not an answer, it is extra info that could be included in the question. It is more a sort of a comment on nobody in an answer.
@Trish That is exactly what I wrote above :) that is indeed the way to go
 
Trish
Trish
6:47 PM
@0scar you'd have to program the machine to take custom commands to shift one side up or down in relation to the other...
 
0scar
0scar
7:22 PM
@Trish Yes that is why my colleague has written his own software. I'll ask him tomorrow.
 
Trish
Trish
7:47 PM
@0scar you'll need a custom "CAM" module and software, but yes, with the right setup it could even (piece by piece) create "rounded" upper phases step by step, and be adjusted to cut quite some thickness. Limiting factor: only Concave, no convex roundings from one to the other
 
Christoph
Christoph
8:24 PM
@Trish if one end of the wire is fixed, the mounting on the far side would indeed be tricky, because it has to allow for the wire to change length and angle without causing any bends in the wire
in a cutter with x/y/z 1100/500/300 mm, the wire's length would change by up to 245 mm. Most wing core designs would use a lot less than that, but still - not negligible
 
Trish
Trish
@Christoph no, both sides need to move along XZ. But you can either move the mounting points individually (basically 2 times the motion system moving in unison, but also possibly allowing to change the angle of the wire in print) or have one fixed mounting point that holds a C with the wire. This is mechanically more easy, and if you mount the C with steppers to turn it out of the way, you can get quite a free cutting. "Roll" so to say
For changing the cutting angle, you'd need to add at least a second stepper orthogonally to the one rotating the C, allowing to "pitch" the Cutter.
A quite... simple solution to the tensioning system could be that the "far" side of the printer has the wire run over a rill, the roll is the wire to ground, the rest of the wire goes down and carries a quite heavy weight that keeps it under tension even as it moves.
 
Christoph
Christoph
I'd need two pairs of x/y to cut the shapes I have in mind (wings, maybe fuselage). They'd cut slightly different shapes, so 4 individual axes
 
Trish
Trish
you get a minimum working height that way though, or need to operate it at the free side of a table.
4 axes? or you mean 4 angels of cutting?
 
Christoph
Christoph
two planes, one left and one right. The planes are in x/y, as in the thing linked to above
tensioning can still be done with a C-shaped bow. Then the tensioning is completely decoupled from the movement
 
Christoph
Christoph
8:49 PM
otoh if the wire is fixed on one end, I could use a 3d printer nozzle to center it
 
 
2 hours later…
0scar
0scar
10:41 PM
@Greenonline I found the problem of 3dprinting.stackexchange.com/questions/4624/… in the configuration file, please review :)
 

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