Knurled surface finishing library
Description
In this case the self-replicating polyhedron is intended to give a mechanical touch to your freshly (or not) designed cylindrical surfaces. Hmmmm... you can also thing that those things all-around the cylinder are diamonds and use it for jewelry.
The examples scad provided uses OpenSCAD MakerBot Font Module by grokbeer licensed under BY-SA-NC license (link in the instructions section)
Photos... aubenc.imgur.com/knurled_finish_surface
UPDATE:
(Just in case you don't read the comments bellow)
Video by sirmakesalot (thank you very much!!)... youtube.com/watch?v=uz8h--NsX7E
Things using this library :-)
Bowden Clamp for Ultimaker by owen
thingiverse.com/thing:11864
Spindle for 5lb spool by mikeq
thingiverse.com/thing:12871
Knurled "topper" for stepper motors by Pazu
thingiverse.com/thing:13978
Ultimaker Hobbed Bolt Release by bkubicek
thingiverse.com/thing:14505
Hobbed bolt holder by coffeeMaker
thingiverse.com/thing:16136
Shane's Coral Frag Plugs by sgraber
thingiverse.com/thing:16982
Bowden Clamp for Ultimaker (Feeder End) by pit3k
thingiverse.com/thing:17027
Instructions
Go to thingiverse.com/thing:8796 to get the screw library, follow that thing's own instructions to be able to use it and come back.
Download 'knurledFinishLib.scad' and drop it into your OpenSCAD library folder or the folder where you are writing your OpenSCAD script.
Use 'knurledFinishExamples.scad' to start playing with this library.
Knurl things.
Print them.
Share them.
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Can you knurl interior surfaces too, like the inside of a pipe?
hmmmmm...
Well, it should be as easy as extracting the knurl cylinder from another cylinder. The only thing is...
...right now I cannot tell what are exactly the inner/outer diameters for the knurl.
I guess that it shouldn't be difficult to find out by taking a look to the library. Hopefully I can find some time in the following 2 days if you are not in a hurry ?
Wow. Instantly my favourite show-off piece, and printed perfectly first time :)
Great design!
Printed first try with no modifications necessary (or cleanup required)
Awesome! I tried this when I first got my TOM and it didn't quite work. Now I have learned a few things and have my machine dialed! worked on the first try no cleanup! Video to come later tonight, Sweeeeet!
I made a set at 1.00 scale, but I could not quite get the nut to fit. I reprinted the nut at 1.05 scale and it threaded on, but maybe a bit looser than I would have liked. So probably scale of 1.02 or 1.03 is right. Did this work fine for everyone else at 1.00 scale for both?
Sorry to hear that :( In fact, this set is not meant to be scaled.
Because every printer is different, there is a little tunning to get this working fine. Printing the bolts at higher feedrate and the nuts at lower speed helps with the quality of the print but may make the fit to tight or impossible.
There are parameters in "knurledFinishExamples.scad" to help.
In your case I would set n_gp in nut_4_Makerbolt() module to 0.25 and see what happens...
I also encourage everyone to play a little bit with the screw library (thingiverse.com/thing:8796) to find out what are the profiles and scad (gap) parameters for bolts
&
amp; nuts gaps. I've successfully print threads that work from 7mm to 95mm.
Once you find the right parameters for, let's say the little threads, finding the right ones for the larger ones ins much easier and everything in the middle is quite straight forward :-D
Yes, for the design. I have found very few things that will Skein right off and print VERY well. I've gone nut
&
amp; bolt crazy. The picture is 2X because I was having problems with another small print. The 2X came out beautiful. I can't put it down. So, I'm not making about a dozen for some Boy Scouts to play with. The regular size also prints amazingly well.
One suggestion/request - knock the knurls down to about .75 and fillet/radius them a little more. They are authentic but, man they hurt. :-D
Yeah, the parameters I used were intended to give a nice result for the size I was uploading the examples here but can be too wild when you scale it up :-D
Well that's the magic of OpenSCAD, just change the parameters to taste (to make it even more aggressive :-P )
To clarify. The knurls to be .25 smaller or .75 of their present values. Here is a picture of the differing sizes I'd printed.
I like printing good designs. It makes the bot look more than its normal amazing and sure brings the childish joys back. I just make a few calculated SF settings, generate gcode, print and watch magic happen. The tolerances are right on.
THANK YOU! For...
...making one of those :) and what an awesome print!!
...uploading the photo
...the comment.
I was adding a surface smoothing parameter which I thought it was ridiculous because bot1334 does already this job :-P Now that I see your print I'm also happy that I did it.
This could be modified to be the handle of a double edge safety razor.
More from aubenc
Mine didn't fit together, but I fixed it! They weren't perfectly round, and jammed. So I dropped the nut (made of PLA) in a cup of boiling water, then ran it on the bolt. Better, but still stiff. Then I heated the bolt, and used the improved nut to ease the thread. When the bolt cooled, it fitted perfectly!
A useful way to get PLA things to fit.
Cool! Nice tip!! However, wait... they weren't perfectly round??? I'd would check the tension of the belts and grease/oil the rods!