Using the standard module it tapers the ends of the blades:
http://forum.openscad.org/file/n11853/auger_end1.jpg
http://forum.openscad.org/file/n11853/auger_end2.jpg

So it turns out like 5 blades plus 2 1/2 tapers like so:
http://forum.openscad.org/file/n11853/auger_full.jpg

Is that what you're after, or should I make it longer and just chop the ends
flat so there is no taper?

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i.e. Like this:
http://forum.openscad.org/file/n11854/auger_full_chopped.jpg

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Dear Michael,
wow, thats nice work, it looks great.
(Sorry for the delayed answer, I got off work and had dinner too.)
The ends look fine, they don't have to spiral in, they can terminate in a
straight line, but no need to make any changes now.
I assume that it is 114mm +/-, the shaft length doesn't need to be any
longer than that.
Will you split it in half for printing? That worked for the other one, I
assume thats the best position for printing?
It really looks great, I can't thank you enough.
I will be sure to give you credit for your contribution. I will send you the
details of the use in a private email.
Do you need anything else from me?
Thanks!
Tom

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I presume you are talking about the latest one, with the flat ends?

Yes I will split it in half, as well as the whole one.

You just want the stl's?

It is 114.5 long and 31.5 in diameter, as specified. Printer tolerances may
vary the result.

No need for credit, I was just playing with other's code.

I'll do the stl's after lunch (i.e. in a little while).

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Yes, the latest version with the flat ends.

Dimensions are spot on.

stl's would be appreciated.

looking forward to a print test.

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Here you go.

One half
auger_114-5_x_31-5_flat_ends_half_A.stl
http://forum.openscad.org/file/n11858/auger_114-5_x_31-5_flat_ends_half_A.stl

Other half
auger_114-5_x_31-5_flat_ends_half_B.stl
http://forum.openscad.org/file/n11858/auger_114-5_x_31-5_flat_ends_half_B.stl

Whole Vertical (with a good/tuned printer you may be able to print it this
way)
auger_114-5_x_31-5_flat_ends_whole_upright.stl
http://forum.openscad.org/file/n11858/auger_114-5_x_31-5_flat_ends_whole_upright.stl

Side on, just because it was there
auger_114-5_x_31-5_flat_ends_whole.stl
http://forum.openscad.org/file/n11858/auger_114-5_x_31-5_flat_ends_whole.stl

Hopefully they fit in any upload limits.

Have fun ;)

Unless specifically shown otherwise above, my contribution is in the Public Domain; To the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. This work is published globally via the internet. :) Inclusion of works of previous authors is not included in the above.

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Oh Nice!
Thanks so much, you really made my day. I can’t thank you enough!
I’ll be printing first thing in the morning.
Pictures, and an explanation, to follow soon.

PS, I contacted some folks in our Engineering Dept., I might hear from them,
we had a few snow storms in the last few weeks, very unusual for us, and
we had a few days off because of the weather each week.

Take care,
Tom Hartlove
Senior Lab Specialist
Old Dominion University
Nuclear & Particle Physics Group
Norfolk, VA USA
thartlov@odu.edumailto:thartlov@odu.edu

On Mar 2, 2015, at 9:11 PM, MichaelAtOz [via OpenSCAD] <ml-node+s1091067n11858h44@n5.nabble.commailto:ml-node+s1091067n11858h44@n5.nabble.com> wrote:

Here you go.

One half
auger_114-5_x_31-5_flat_ends_half_A.stlhttp://forum.openscad.org/file/n11858/auger_114-5_x_31-5_flat_ends_half_A.stl

Other half
auger_114-5_x_31-5_flat_ends_half_B.stlhttp://forum.openscad.org/file/n11858/auger_114-5_x_31-5_flat_ends_half_B.stl

Whole Vertical (with a good/tuned printer you may be able to print it this way)
auger_114-5_x_31-5_flat_ends_whole_upright.stlhttp://forum.openscad.org/file/n11858/auger_114-5_x_31-5_flat_ends_whole_upright.stl

Side on, just because it was there
auger_114-5_x_31-5_flat_ends_whole.stlhttp://forum.openscad.org/file/n11858/auger_114-5_x_31-5_flat_ends_whole.stl

Hopefully they fit in any upload limits.

Have fun ;)
Unless specifically shown otherwise above, my contribution is in the Public Domain; To the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. This work is published globally via the internet. :)
Inclusion of works of previous authors is not included in the above.
The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/

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Tom,

On checking it is -0.5mm diameter, due to a rounding error, or rather a
truncation in my calculations.

Let me know if that is beyond tolerance. Relatively easy to fix.

and to finish off, this is the code:

use <Thread_Library.scad>
// slice along Y-axis
rotate([90,0,0])
difference() {
auger();
translate([-20,-40,-1]) // I just manually cludged this 2 times for 2
halves
cube([40,40,120]);
}

module auger() {
l=114.5;
p=20;
pR=4;
thtp=l/p/10;
f=p/thtp+pR;
echo(1,p,pR,thtp,f);
translate([0,0,-3]) %cylinder(d=31.5,h=2,$fn=32);  // visual guide for size

    cylinder(h=114.5, r=4, $fn=24);   		// core cylinder
intersection() {
	cylinder(d=32,h=114.5);					// chop to this length
	translate([0,0,-p/2])
		trapezoidThread( 
			// had to work out the relationships, 
			// exta p was to expand beyond the tapered ends
			length=l+p-pR+p, 	
			pitch=p,
			pitchRadius=pR,
			threadHeightToPitch=thtp,
			profileRatio=0.20,
			threadAngle=10,
			RH=true,
			clearance=0.1,
			backlash=0.1,
			stepsPerTurn=48
		);
}

}

Formalities.
As I said, this is mostly based on the  cat feeder auger
http://www.thingiverse.com/thing:27854  by kitlaan.
As such my public domain declaration, below, only applies to my parts,
kitlaan's is  Creative Commons - Attribution
http://creativecommons.org/licenses/by/3.0/
http://creativecommons.org/licenses/by/3.0/

Unless specifically shown otherwise above, my contribution is in the Public Domain; To the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. This work is published globally via the internet. :) Inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”  Fight it! http://www.ourfairdeal.org/

View this message in context: http://forum.openscad.org/Assistance-modifying-aa-scad-file-tp11837p11860.html
Sent from the OpenSCAD mailing list archive at Nabble.com.

dear Michael,
Your attached files have a “webloc” at the end of the file name when I move them to my computer.
My MakerBot application does not recognize that and will not open it.

Can you advise what I can do to open them?

Also, how difficult is it to place both of the halves side by side for printing?
Someone did that with the Kitty Auger and it prints out on the same raft.
Is that something I can do easily, in printer settings?

I appreciate your help.
Tom

On Mar 2, 2015, at 9:11 PM, MichaelAtOz [via OpenSCAD] <[hidden email]x-msg://27/user/SendEmail.jtp?type=node&node=11859&i=1> wrote:

Here you go.

One half
auger_114-5_x_31-5_flat_ends_half_A.stlhttp://forum.openscad.org/file/n11858/auger_114-5_x_31-5_flat_ends_half_A.stl

Other half
auger_114-5_x_31-5_flat_ends_half_B.stlhttp://forum.openscad.org/file/n11858/auger_114-5_x_31-5_flat_ends_half_B.stl

Whole Vertical (with a good/tuned printer you may be able to print it this way)
auger_114-5_x_31-5_flat_ends_whole_upright.stlhttp://forum.openscad.org/file/n11858/auger_114-5_x_31-5_flat_ends_whole_upright.stl

Side on, just because it was there
auger_114-5_x_31-5_flat_ends_whole.stlhttp://forum.openscad.org/file/n11858/auger_114-5_x_31-5_flat_ends_whole.stl

Hopefully they fit in any upload limits.

Have fun ;)
Unless specifically shown otherwise above, my contribution is in the Public Domain; To the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. This work is published globally via the internet. :)
Inclusion of works of previous authors is not included in the above.
The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/

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Hi Michael,
I apologize for my ignorance with this, I also didn’t realize I posted that last comment on the forum this morning.

I guess it is best to send the other format, not the .stl and we can convert it through the MakerBot application.
I’m not familiar with the “webloc” part of the file name or know what to do about it.

I was told it would be advantageous for them to be printed together on one raft, but I don’t want to ask for more from you unless its an easy fix.

I’ll be here all day, sorry you are waking up to this too.

I look forward to hearing from you. In the mean time I am trying to unravel the files here.
(If you prefer, we can talk by phone, if you provide a number I will place the call, that might help?)

Thanks,
Tom

On Mar 2, 2015, at 11:14 PM, MichaelAtOz [via OpenSCAD] <ml-node+s1091067n11860h6@n5.nabble.commailto:ml-node+s1091067n11860h6@n5.nabble.com> wrote:

Tom,

On checking it is -0.5mm diameter, due to a rounding error, or rather a truncation in my calculations.

Let me know if that is beyond tolerance. Relatively easy to fix.

and to finish off, this is the code:

use <Thread_Library.scad>
// slice along Y-axis
rotate([90,0,0])
difference() {
auger();
translate([-20,-40,-1]) // I just manually cludged this 2 times for 2 halves
cube([40,40,120]);
}

module auger() {
l=114.5;
p=20;
pR=4;
thtp=l/p/10;
f=p/thtp+pR;
echo(1,p,pR,thtp,f);
translate([0,0,-3]) %cylinder(d=31.5,h=2,$fn=32);  // visual guide for size

    cylinder(h=114.5, r=4, $fn=24);   // core cylinder
    intersection() {
            cylinder(d=32,h=114.5); // chop to this length
            translate([0,0,-p/2])
                    trapezoidThread(
                            // had to work out the relationships,
                            // exta p was to expand beyond the tapered ends
                            length=l+p-pR+p,
                            pitch=p,
                            pitchRadius=pR,
                            threadHeightToPitch=thtp,
                            profileRatio=0.20,
                            threadAngle=10,
                            RH=true,
                            clearance=0.1,
                            backlash=0.1,
                            stepsPerTurn=48
                    );
    }

}

Formalities.
As I said, this is mostly based on the cat feeder augerhttp://www.thingiverse.com/thing:27854 by kitlaan.
As such my public domain declaration, below, only applies to my parts,
kitlaan's is  Creative Commons - Attributionhttp://creativecommons.org/licenses/by/3.0/ http://creativecommons.org/licenses/by/3.0/
Unless specifically shown otherwise above, my contribution is in the Public Domain; To the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. This work is published globally via the internet. :)
Inclusion of works of previous authors is not included in the above.
The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/

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