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Anet A8

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Ian Jones13/06/2017 19:52:44
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3080 forum posts
1369 photos

thumbs up Fantastic job DB, which filaments did you use? I quite fancy trying some of those metalised ones.

It would be great if you uploaded the files for us.

David Bowdler14/06/2017 23:34:34
6 forum posts
2 photos

Thank you all for your positive comments, I will upload the CAD files using the link Geoff provided. The filament is 1.75mm from Solid Ink. The pushrods can be angled if required the rods are 1.6mm dia stainless steel welding wire. The cylinder heads are hidden inside the aluminium cowl so cannot be seen (see photo). I will mod the head at some stage to provide a location point for the pushrod and fix the angle of the pushrod. I am fitting a wooden prop in place of the plastic prop in the photo. I may even move the motor forward slightly too.Dummy Engine Installed.jpg

Simon Chaddock15/06/2017 00:45:19
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4853 forum posts
2493 photos

David

That is a very neat installation.

Given that the Pupeteer is not really true scale to start with I would not really worry about the push rods.

Only if it actually went round with prop would I start to worry about the scale positioning of the push rods! wink 2.

David Bowdler15/06/2017 01:20:49
6 forum posts
2 photos

I have given you some duff information on my previous post it was Rigid Ink not Solid Ink filament. It was also PLA. Sorry for misleading you. DB

Simon Chaddock19/06/2017 11:00:55
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4853 forum posts
2493 photos

As part of a micro EDF project I printed this thrust tube and inner cone for a 40 mm EDF.

ABS/PLA thrust tube

The interesting bit is that despite using the same CURA print files, adjusted only for head temperature, the yellow one in ABS weighs 2.7.g whereas the red one in PLA weighs only 2.1, a saving of 23%, not insignificant where planes are concerned. wink 2

It does have to be said that the ABS version is generally a bit 'stiffer' so where shape rather than strength or stiffness are not the primary design concerns the type of plastic does make a difference.

My hope is this exhaust tube will improve the total thrust by gradually changing the exhaust duct from a relatively large diameter 'annulus', resulting from the large diameter out runner bell, to a simple nozzle. In this case the duct area (actually 88% FSA) has been kept constant down the length of the tube. One advantage of printing is of course any of the parameters can be easily changed.

In the above the outer and inner cones are actually printed individually using the "spiralize" option which prints the cone in one continuous pass so eliminating the Z axis 'seam' normally created by the start of each print layer.

At this stage they are just 'test' pieces printed at low quality for speed using a 0.2 mm layer height. For the actual components that will be used in plane fine quality but slow prints will be used.

David Bowdler19/06/2017 12:17:47
6 forum posts
2 photos

I have uploaded the assembly drawing and component STL files on to Thingyverse using the link that Geoff posted on the previous page. Hopefully all is clear. If not drop me a line on this forum and I will do my best to help.

MaL19/06/2017 13:46:32
43 forum posts

ummm..not showing yet.. perhaps they need vetting before being released......

David Bowdler19/06/2017 23:33:28
6 forum posts
2 photos

MaL I have created the username Bowdidley on Thingiverse try searching on that. DBsmiley

MaL20/06/2017 17:46:55
43 forum posts

Yep.. that works David Thanks.thumbs up

Geoff Gardiner20/06/2017 19:36:30
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211 forum posts
376 photos

Nice one David - many thanks.

I'll have a go at printing that.

What size motor are you using with it in your Pup?

David Bowdler21/06/2017 08:50:45
6 forum posts
2 photos

Geoff the motor is an E Max BL 2832/05, I have yet to fly the Puppeteer, which I recently bought second hand. The previous owner told me that the model will loop. The motor looks about right using the British Standard eyeball test.

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