Screwdriver
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Incredibly it works but due to issues with scale, is not ever going to be sturdy enough.
Needs a redesign.
Needs a redesign.
- Thread starter Dr.Al
- Start date
My Old Landy
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Would you share the .stl file please? I would like to print it if only as a wall hanger!
Screwdriver
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The "problem" is rather more embarrassing. Sketchup is an architectural drawing program, I get around the issues with circles/curves (and gears!) by making the model at scale, often 100:1. The propgram is not parametric, more like 3d vector so once a dimension is made any calculation is lost. Thanks to that pesky Pi being so confoundedly irrational, errors creep in. Models can literally blow themselves apart!
Digression: what Sketchup is absolutely brilliant at is quickly sketching out ideas. You're drawing in 3d and manipulating the object until it "looks" right. If it looks right, it probably is right. Other programs like Fusion assume you know what you want when what I really need is to quickly flit between shapes and structures until I see something I like.
On this occasion I made a simple mistake very early on, most likely confusing a radius with a diameter and the model was scaled to 200x which I only discovered when I exported the STL. The proportions are ok but scaling it down mean the chunky 4mm base was now only 2mm. All of my clearances were halved plus I went a bit tight everywhere with 0.2mm/0.1mm (which became interference fits at the stupily small scale it ended up.
I thought my generous 16mm small spur gears would be perfect for the ~100mm diameter model but in reality, they were 8mm...
Don't get me wrong, the X1 did a magnificent job printing this out but if I had known it would be so minuscule, I would have changed tack. The press fit fixings for the shell bearing/retainer were always going to be impossibly tight, then they ended up half that size!
Incredibly, they did sort of work. The loose fit (!) allows the gear ring to rotate while the small lip keeps it captive and the overhang retains the gear ring etc. But at that scale, surface imperfections are greater than the size of the feature!
Hence my amazement it worked at all....
Digression: what Sketchup is absolutely brilliant at is quickly sketching out ideas. You're drawing in 3d and manipulating the object until it "looks" right. If it looks right, it probably is right. Other programs like Fusion assume you know what you want when what I really need is to quickly flit between shapes and structures until I see something I like.
On this occasion I made a simple mistake very early on, most likely confusing a radius with a diameter and the model was scaled to 200x which I only discovered when I exported the STL. The proportions are ok but scaling it down mean the chunky 4mm base was now only 2mm. All of my clearances were halved plus I went a bit tight everywhere with 0.2mm/0.1mm (which became interference fits at the stupily small scale it ended up.
I thought my generous 16mm small spur gears would be perfect for the ~100mm diameter model but in reality, they were 8mm...
Don't get me wrong, the X1 did a magnificent job printing this out but if I had known it would be so minuscule, I would have changed tack. The press fit fixings for the shell bearing/retainer were always going to be impossibly tight, then they ended up half that size!
Incredibly, they did sort of work. The loose fit (!) allows the gear ring to rotate while the small lip keeps it captive and the overhang retains the gear ring etc. But at that scale, surface imperfections are greater than the size of the feature!
Hence my amazement it worked at all....
Screwdriver
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NB video is "scheduled" for some unfathomable reason and the horrific interface is like taking an exam in bureaucracy.
It should be published any time now-ish (1:30).
It should be published any time now-ish (1:30).
My Old Landy
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Cheers my friend 
slim_boy_fat
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Neat job!
Can I be cheeky and ask if you'd be prepared to print one off for me, I sometimes need to hold short work-pieces in the lathe [Myford ML7] and it's tricky getting them held in the right plane.Happy to cover post and add beer tokens if so. I'd love a 3D printer but don't have the space [or the knowledge of designing for that matter] for one.
You might need to know the width of your jaws to ensure a decent fit.Neat job!
Happy to cover post and add beer tokens if so. I'd love a 3D printer but don't have the space [or the knowledge of designing for that matter] for one.
slim_boy_fat
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slim_boy_fat
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^^ Mr Vernier says 14.35 mm, so 15 I suppose? 
have you posted the file anywhere or did you get it of a site??
daedalusminos
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Timing belt snapped on my engine so I designed another in F360 and 3D printed....
My Old Landy
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It's why I have a 3D printer, just in case.......
Normsthename
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I have been working on converting an old Midi Piano Keyboard into a Janko Keyboard.
en.wikipedia.org
These were invented in 1882 as an alternative to the traditional piano layout.
It has some major advantages over the standard layout.
If you play a song in a certain key, using the same pattern you can transpose it to another key by playing the same pattern at the new key location.
ibb.co
ibb.co
ibb.co
ibb.co
A lot of 3D Printing, but made much quicker with my new Qidi Smart X 3
Here's a demo of a commercial Janko Keyboard being played
Andy
Jankó keyboard - Wikipedia
These were invented in 1882 as an alternative to the traditional piano layout.
It has some major advantages over the standard layout.
If you play a song in a certain key, using the same pattern you can transpose it to another key by playing the same pattern at the new key location.
PXL-20240331-020541421 hosted at ImgBB
Image PXL-20240331-020541421 in Normsthename's images album
ibb.co
PXL-20240331-020532011 hosted at ImgBB
Image PXL-20240331-020532011 in Normsthename's images album
ibb.co
PXL-20240330-173554005 hosted at ImgBB
Image PXL-20240330-173554005 in Normsthename's images album
ibb.co
PXL-20240331-141430590 hosted at ImgBB
Image PXL-20240331-141430590 in Normsthename's images album
ibb.co
A lot of 3D Printing, but made much quicker with my new Qidi Smart X 3
Here's a demo of a commercial Janko Keyboard being played
Andy
Last edited:
zx9
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Can you scale XYZ axis independently in your slicer ? A bit of a long winded way of doing it but it may help with the 4mm thickness becoming 2mm, scale Z = 200% or whatever notation the slicer uses.The "problem" is rather more embarrassing. Sketchup is an architectural drawing program, I get around the issues with circles/curves (and gears!) by making the model at scale, often 100:1. The propgram is not parametric, more like 3d vector so once a dimension is made any calculation is lost. Thanks to that pesky Pi being so confoundedly irrational, errors creep in. Models can literally blow themselves apart!
Digression: what Sketchup is absolutely brilliant at is quickly sketching out ideas. You're drawing in 3d and manipulating the object until it "looks" right. If it looks right, it probably is right. Other programs like Fusion assume you know what you want when what I really need is to quickly flit between shapes and structures until I see something I like.
On this occasion I made a simple mistake very early on, most likely confusing a radius with a diameter and the model was scaled to 200x which I only discovered when I exported the STL. The proportions are ok but scaling it down mean the chunky 4mm base was now only 2mm. All of my clearances were halved plus I went a bit tight everywhere with 0.2mm/0.1mm (which became interference fits at the stupily small scale it ended up.
I thought my generous 16mm small spur gears would be perfect for the ~100mm diameter model but in reality, they were 8mm...
Don't get me wrong, the X1 did a magnificent job printing this out but if I had known it would be so minuscule, I would have changed tack. The press fit fixings for the shell bearing/retainer were always going to be impossibly tight, then they ended up half that size!
Incredibly, they did sort of work. The loose fit (!) allows the gear ring to rotate while the small lip keeps it captive and the overhang retains the gear ring etc. But at that scale, surface imperfections are greater than the size of the feature!
Hence my amazement it worked at all....
Screwdriver
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Version2.
Lot more better.
Fun part will be colouring it in. I am still trying to come up with a way to give the hands the classic watch look but I dare not design in support requirements, it's way too small for any sort of support so the hour hand in particular is still flat and lifeless.
Next step, add some numbers, hours and/or minutes, 1/4 past 1/2 past etc. Might even make it so the "face" can be swapped and the mechanism is free enough I might put on a geared drive so it can really spin!
Lot more better.
Fun part will be colouring it in. I am still trying to come up with a way to give the hands the classic watch look but I dare not design in support requirements, it's way too small for any sort of support so the hour hand in particular is still flat and lifeless.
Next step, add some numbers, hours and/or minutes, 1/4 past 1/2 past etc. Might even make it so the "face" can be swapped and the mechanism is free enough I might put on a geared drive so it can really spin!
Screwdriver
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How do you create the patterned finish on the faces?Version2.
Lot more better.
Fun part will be colouring it in. I am still trying to come up with a way to give the hands the classic watch look but I dare not design in support requirements, it's way too small for any sort of support so the hour hand in particular is still flat and lifeless.
Next step, add some numbers, hours and/or minutes, 1/4 past 1/2 past etc. Might even make it so the "face" can be swapped and the mechanism is free enough I might put on a geared drive so it can really spin!
Screwdriver
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During the design process I am always accounting for the orientation of the part on the print bed. Everything that toouches the bed will be 1. super flat and 2. pick up any patterning in the surface texture. They also need to orient for any projecting features like the standoffs contours etc.
In this case I decided to make everything on the front and back be patterned by using a so called PEI bed. It's a bit "in your face" but this thing is supposed to be child friendly and just wait until you see the colour scheme!
<edit> Note how "rough" the idler gear looks because it has 3d features on the facing side. In real life it looks really decent but is shown up by the almost mirror polish of the bed side parts.
