Mini printable lathe V2 + Chuck - OpenSCAD version.
Description
The size of the guide-rods/axles and screw holes are adjustable in Util.scad
Also some of the main dimensions can be adjusted in the Util.scad
Note that these parts are interexchangeable with the ones from Sublime, unless you change the parameters. If you build this machine from scratch you might want to use thicker guides and a larger guide distance, so the carriage has more stability.
Changes:
"X_carriage" is flat on top, so you can print it flat on that side, fixes the overhang.
There might be some printing problems with overhang in the bearing_block.
Possible upgrades:
Add step motor mounts so you can make a CNC Lathe.
There is very little clearing between the X carriage and the Z front. Any flex or inaccuracies might cause problems.
Instructions
Print everything once, except for:
Upright, which you'll need 3 times.
Bevel_gear, you'll need twice.
Hand_crank, you'll also need twice.
You'll need to print 4 mirrored parts, next to the normal ones: "Z_carriage_left", "Gear_lever", "Cam_lever_part_A" and "Cam_lever_part_B"
For the chuck, print 4x the planet gear. And 4 jaws.
Add 12x 608 bearings.
Add 8M rods for the axles.
Add 6M rods for the guides.
Drill holes larger where I made mistakes ;)
Add a bunch of nuts.
TODO: Add part list for the chuck.
Add a tool holder (see: thingiverse.com/thing:9242 for options)
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So how is the progress? :)
The bearings fit! I was waiting to print a few parts before I got that measurement correctly. I should have the X carriage done soon. I didn't print any of the gears yet.
I'm still missing the bolts for the chuck, so I cannot assemble it yet. (The person who was going to order the parts forgot it, and only did so this weekend)
I've started to print it (finally) I'm still waiting for a few parts to end up in the mail.
I've changed the guides to 12mm copper tubing, which is common used for gas lines and so easy to get and not that expensive. There also is little flex in them compared to M6 treaded rods.
12mm is the max you can get away with in the current design. Else the walls will get too thin.
I'm going to m
odify the X carriage a bit more so it contains screw holes to attach the tool holder.
Update!
Now with chuck, and most of the issues Sublime mentioned fixed. There are also a bunch of parameters in Util.scad that you can tweak to your linking.
I know it's a work in progress but it would still be nice to have the stl's. I myself can't open a scad files.
A few notes:
The gear look great and I will definitely be using yours when it comes time to replace mine.
The nut location in the X-carriage does not have a taper for printing vertically. So it has a nasty overhang.
You removed the taper from the feet on the Z-carriage ends. This was there to m
ake the surface area that touched the table smaller to reduce friction.
The hex hole in the Z-carriage front you changed to a round hole looks to small to have a nut on the rod in that location.
You changed the flat top holes for the 608 bearings in the Bearing block to round. This will make it mu
ch harder to print.
The cone shape in the bottom of the center gear looks a little shallow.
You removed the taper on the top of the bearing holder of the Z-carriage front. This was REALLY important, without it the X-carriage will hit the bearing holder.
The holes in the Bearing block do not look
big enough to have a nut spinning in them.
For the SCAD files: http://www.openscad.org/ runs on Linux/MacOS and Windows. For Ubuntu it's even in the repositories.
Just open a file, press F6, and then from the menu select "export STL". (if you get a warning about OpenGL2, ignore it, it only effects the F5 render)
The gears are from the MCAD gears library, which makes these wonderful gears easy to make 8-) the Bevel_gear is also made with the same library.
I noticed the nasty overhang in the X-carriage, but I'm thinking about rotating it 90 deg so it sits on the top, removing the angled part from the top.
Solves all the overhang problems and makes it easy to print. (Also, my printer will print this overhang with just a few flaws, I printed a much worse overhang/bridge combination yesterday)
Right now I made the model for the "optimal" machine, because not everyone needs the overhang tweaks. I'll add
the overhang fixes at a later point, so you can enable/disable them.
The feet should still be tapered? Maybe a bit less then normal. In any case, if you make the carriage guides 10mm instead of 6mm you could just remove the feet I think.
For the Z-carriage front, do you think we could just cut off
the top of the bearing holder? Will it still be strong enough? That would make this part, and the X-carriage simpler in design.
And indeed, the holes next to the bearing are not large enough, I noticed that myself. Also, the holes in the carriage don't account for the tubing around the guides, so
these are to small.
It would be neat to have a world map with the approximate locations of where every part and ancestor etc came from for things like this
I have been following this project with rapt attention!
Now, if only thingiverse had some way to notify me when you post updates!
Good work. I'm sure it will start to evolve a lot faster now.
License
More from Daid
Nice! Wonder how much would the non printed parts for one run, and what you could get away with lathing with it, I don't have machine shop access any more, but usually just need to lathe rather small parts :)
Actually, I never got around to print all parts of this thing. When I made this my printer was pretty new to me and I had trouble getting the parts to come out right. Now I know I can print this fine, but I also gained access to 2 real lathes.