mechanical engineering please give me somea idaeas for my diploma mechanical projects https://reprap.org/forum/read.php?1,27276,27276#msg-27276 Wed, 20 May 2026 21:39:39 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,27276,27485#msg-27485 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27485#msg-27485 [en.wikipedia.org]

Except we will not be having the worm drive reciprocate as they are in injection moulding.
The system for a RepRap will also mean that the system will operate vertically instead of horizontally as in injecting moulding]]> Grogyan General Sat, 12 Sep 2009 21:13:07 -0400 https://reprap.org/forum/read.php?1,27276,27482#msg-27482 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27482#msg-27482 -------------------------------------------------------
> From what I understand, the problem with all the
> granual extruders is that they work perfectly the
> first time you start them up, but the second time
> they can't be started because the melted plastic
> mixes with the granuals and you can't start the
> drive again.


How do they deal with this in injection molding machines?]]> annodomini2 General Sat, 12 Sep 2009 18:45:07 -0400 https://reprap.org/forum/read.php?1,27276,27472#msg-27472 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27472#msg-27472 letsburn00 General Sat, 12 Sep 2009 13:36:52 -0400 https://reprap.org/forum/read.php?1,27276,27442#msg-27442 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27442#msg-27442 unfold General Fri, 11 Sep 2009 16:57:27 -0400 https://reprap.org/forum/read.php?1,27276,27415#msg-27415 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27415#msg-27415 Forrest Higgs General Fri, 11 Sep 2009 09:18:14 -0400 https://reprap.org/forum/read.php?1,27276,27394#msg-27394 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27394#msg-27394 [blog.reprap.org]]]> unfold General Thu, 10 Sep 2009 15:03:19 -0400 https://reprap.org/forum/read.php?1,27276,27387#msg-27387 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27387#msg-27387
]]> jpcw General Thu, 10 Sep 2009 06:44:12 -0400 https://reprap.org/forum/read.php?1,27276,27386#msg-27386 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27386#msg-27386 -------------------------------------------------------
> jpcw Wrote:
> --------------------------------------------------
> -----
> > sam0737 Wrote:
> >
> --------------------------------------------------
>
> > -----
> > > A hopper extruder that accepts plastic in
> > granule
> > > form! Not necessary in one part, could be
> > > hopper/extruder that produce 3mm filament
> than
> > > feed into the existing extruder.
> > >
> > > I think this would reduce the running cost a
> > whole
> > > lot...! Especially for those who can't get
> > > filament cheaply.
> > This might be able to be done with a preheat
> > chamber with a small airpump attached to force
> the
> > molten granules directly in to the normal head.
>
> I think you'll need a LOT more force than that to
> push granules into the extruder.
>
> It depends on how challenging of a project this
> guy wants, the more challenge, the better his
> marks


Rather than pushing the granules in to the extruder chamber, melt them in a preheat chamber first and use air pressure to force the molten plastic through. You would need to put a valve of some type in the nozzle. I’ve been working on a couple of ideas for this that might work for liquids and also molten plastics and give a cleaner “switch off” on the extruded output.]]> jpcw General Thu, 10 Sep 2009 04:14:07 -0400 https://reprap.org/forum/read.php?1,27276,27383#msg-27383 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27383#msg-27383 -------------------------------------------------------
> sam0737 Wrote:
> --------------------------------------------------
> -----
> > A hopper extruder that accepts plastic in
> granule
> > form! Not necessary in one part, could be
> > hopper/extruder that produce 3mm filament than
> > feed into the existing extruder.
> >
> > I think this would reduce the running cost a
> whole
> > lot...! Especially for those who can't get
> > filament cheaply.
> This might be able to be done with a preheat
> chamber with a small airpump attached to force the
> molten granules directly in to the normal head.

I think you'll need a LOT more force than that to push granules into the extruder.

It depends on how challenging of a project this guy wants, the more challenge, the better his marks]]> Grogyan General Thu, 10 Sep 2009 03:15:23 -0400 https://reprap.org/forum/read.php?1,27276,27348#msg-27348 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27348#msg-27348 -------------------------------------------------------
> A hopper extruder that accepts plastic in granule
> form! Not necessary in one part, could be
> hopper/extruder that produce 3mm filament than
> feed into the existing extruder.
>
> I think this would reduce the running cost a whole
> lot...! Especially for those who can't get
> filament cheaply.
This might be able to be done with a preheat chamber with a small airpump attached to force the molten granules directly in to the normal head.]]> jpcw General Wed, 09 Sep 2009 08:28:13 -0400 https://reprap.org/forum/read.php?1,27276,27338#msg-27338 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27338#msg-27338 It is an environmental issue, a convenience issue, and a potential cost-saving issue.

Hazel]]> MotorAssist General Wed, 09 Sep 2009 04:35:57 -0400 https://reprap.org/forum/read.php?1,27276,27330#msg-27330 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27330#msg-27330
I think this would reduce the running cost a whole lot...! Especially for those who can't get filament cheaply.]]> sam0737 General Wed, 09 Sep 2009 02:42:02 -0400 https://reprap.org/forum/read.php?1,27276,27323#msg-27323 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27323#msg-27323
The Sketch shows a possible 2 head changer, just changing the geometry of the head changer would allow a 3 or even a 4 head changer

I've shown the extruder raised up a bit to see a proposed geometry for an extruder to slot into



As for a Darwin head changer, I personally wouldn't even waste my time on something so simple anyway, that is if I was doing a BE Mech degree
]]> Grogyan General Wed, 09 Sep 2009 00:43:29 -0400 https://reprap.org/forum/read.php?1,27276,27314#msg-27314 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27314#msg-27314
Of course i'm suggesting a 4 nozzle head changer, but the principle is till the same for a 3 nozzle head changer or even a 2 nozzle head changer.

I'll do a sketch if I can to show what i'm suggesting.

Anyone is more than welcome to tackle it, I was, after building my printer so that I have something to print parts with :P]]> Grogyan General Tue, 08 Sep 2009 22:51:01 -0400 https://reprap.org/forum/read.php?1,27276,27306#msg-27306 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27306#msg-27306 Forrest Higgs General Tue, 08 Sep 2009 17:24:52 -0400 https://reprap.org/forum/read.php?1,27276,27303#msg-27303 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27303#msg-27303 At least that is what i've observed in the videos.
The Mendel head changer would be a rotary one on one side, using a stepper and a solenoid to lock, unlock and rotate through various heads.]]> Grogyan General Tue, 08 Sep 2009 17:06:10 -0400 https://reprap.org/forum/read.php?1,27276,27297#msg-27297 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27297#msg-27297 -------------------------------------------------------
> How about an Auto head changer, able to change
> between 2 or 3 heads.

Yeah, but for Darwin {which is relatively easy} or Mendel{which isn't}?]]> Forrest Higgs General Tue, 08 Sep 2009 15:37:34 -0400 https://reprap.org/forum/read.php?1,27276,27290#msg-27290 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27290#msg-27290 Grogyan General Tue, 08 Sep 2009 14:36:11 -0400 https://reprap.org/forum/read.php?1,27276,27278#msg-27278 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27278#msg-27278 Forrest Higgs General Tue, 08 Sep 2009 10:19:30 -0400 https://reprap.org/forum/read.php?1,27276,27277#msg-27277 Re: mechanical engineering https://reprap.org/forum/read.php?1,27276,27277#msg-27277
Viktor]]> VDX General Tue, 08 Sep 2009 10:14:02 -0400 https://reprap.org/forum/read.php?1,27276,27276#msg-27276 mechanical engineering https://reprap.org/forum/read.php?1,27276,27276#msg-27276 maniygandan.t General Tue, 08 Sep 2009 09:45:36 -0400