1:16 scale JS-2 Turret
by ferret7, published
Description
Russian heavy tank JS-2 model 1955 ChKZ
This is the turret for the conversion of a Tamiya 1:16 scale KV-1 tank to a JS-2 tank. The upper hull and glacius plate will soon follow.
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Hello ferret7
you will be welcome to get your build and show it on the site i have. http://scaledtankseurope.forum...
The next time I take the printhead apart I'll photograph it. The major difference I see between the Stratasys and the RepRap/MakeBot is the later do not have any thermal inertia built into the printhead which makes maintaining the temperature for an even extrusion difficult. The model material and surrounding air keep removing the heat making it necessary to pause or pulse the feed stock resulting in uneven extrusion. If you were to insert the heater into a block of dense metal you would have a thermal mass (sort of acts like a capacitor in an electronic circuit evening out the peeks and valleys). I was also considering making modifications to my printhead (the following is copyrighted 20090815) to lay down a fine wire thread for embedded circuitry right into the FDM model. I'm working on this design for my tank turrets ( main gun elevation, coaxial laser sight, IR detector, etc...)
If you have pictures I'd be interested. Stratasys doesn't want to show us too much of their machine's internals. A shame, if we make improvements compatible with their machines they could use those and still rely on their patents to fend of commercial 'manufacturer' type competitors. I guess they fear the downsides more than they have confidence in any of the positive effects.
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I noticed that PLA will also dissolve in lye after a while. Nophead and I experimented with this and PLA seems like a good candiate for support material: http://blog.erikdebruijn.nl/ar...
Very nice work Erik ! I think you are definitely on to some thing with the PLA, remember it does not have to be that strong, just has to support the ABS/model material. I spent Sunday afternoon repairing the printhead on my Dimension SST 1200 (broken pin that aligns the support material just before it enters the heater/extruder nozzle - saved $5000 USD on a Stratus repair bill - pays to be a DIY). I know how the whole thing works now - very intimately - and can say that with a tad bit more work the RepRap/MakerBot can support using support material.
Hello John,
You may have just forgot but are you going to upload the .stl file?
Thanks!
Yes you are correct - I'm still getting my feet wet with this site (can you tell ;) )
Hi All,
The support material is very much like the gelatin used in medical capsules, it is "water soluble" in a solution of very strong dishwashing detergent (surfactiant) and at 60 degree Celsius (you don't want you hands in it !). When it is disposed of it is diluted way down 20:1 or so. I looked at the contents when I 1st acquired the machine and it is basically sodium hydroxide (lye) and sea weed/ animal gelatin - how green it is I'll leave that up to the chemists out there (I would be interested).
The printhead does "melt/fuse" the surface together to form an incredibly strong component in the horizontal plane (along the grain - like wood), I could stand on this part (110kg.) and it would not break ( the walls are 2.8mm thick nominally)
One of the things that I find the most irritating about this process is what I call noodling (sort of like toothpaste extruded in funny loops when the toolpath is not exactly on an even step (anti-aliasing ?), which means I have to play around with the part orientation to try and minimize the effect.
Hi All,
The support material is very much like the gelatin used in medical capsules, it is "water soluble" in a solution of very strong dishwashing detergent (surfactiant) and at 60 degree Celsius (you don't want you hands in it !). When it is disposed of it is diluted way down 20:1 or so. I looked at the contents when I 1st acquired the machine and it is basically sodium hydroxide (lye) and sea weed/ animal gelatin - how green it is I'll leave that up to the chemists out there (I would be interested).
The printhead does "melt/fuse" the surface together to form an incredibly strong component in the horizontal plane (along the grain - like wood), I could stand on this part (110kg.) and it would not break ( the walls are 2.8mm thick nominally)
One of the things that I find the most irritating about this process is what I call noodling (sort of like toothpaste extruded in funny loops when the toolpath is not exactly on an even step (anti-aliasing ?), which means I have to play around with the part orientation to try and minimize the effect.
Hi All,
The support material is very much like the gelatin used in medical capsules, it is "water soluble" in a solution of very strong dishwashing detergent (surfactiant) and at 60 degree Celsius (you don't want you hands in it !). When it is disposed of it is diluted way down 20:1 or so. I looked at the contents when I 1st acquired the machine and it is basically sodium hydroxide (lye) and sea weed/ animal gelatin - how green it is I'll leave that up to the chemists out there (I would be interested).
The printhead does "melt/fuse" the surface together to form an incredibly strong component in the horizontal plane (along the grain - like wood), I could stand on this part (110kg.) and it would not break ( the walls are 2.8mm thick nominally)
One of the things that I find the most irritating about this process is what I call noodling (sort of like toothpaste extruded in funny loops when the toolpath is not exactly on an even step (anti-aliasing ?), which means I have to play around with the part orientation to try and minimize the effect.
Hi All,
The support material is very much like the gelatin used in medical capsules, it is "water soluble" in a solution of very strong dishwashing detergent (surfactiant) and at 60 degree Celsius (you don't want you hands in it !). When it is disposed of it is diluted way down 20:1 or so. I looked at the contents when I 1st acquired the machine and it is basically sodium hydroxide (lye) and sea weed/ animal gelatin - how green it is I'll leave that up to the chemists out there (I would be interested).
The printhead does "melt/fuse" the surface together to form an incredibly strong component in the horizontal plane (along the grain - like wood), I could stand on this part (110kg.) and it would not break ( the walls are 2.8mm thick nominally)
One of the things that I find the most irritating about this process is what I call noodling (sort of like toothpaste extruded in funny loops when the toolpath is not exactly on an even step (anti-aliasing ?), which means I have to play around with the part orientation to try and minimize the effect.
Hi All,
The support material is very much like the gelatin used in medical capsules, it is "water soluble" in a solution of very strong dishwashing detergent (surfactiant) and at 60 degree Celsius (you don't want you hands in it !). When it is disposed of it is diluted way down 20:1 or so. I looked at the contents when I 1st acquired the machine and it is basically sodium hydroxide (lye) and sea weed/ animal gelatin - how green it is I'll leave that up to the chemists out there (I would be interested).
The printhead does "melt/fuse" the surface together to form an incredibly strong component in the horizontal plane (along the grain - like wood), I could stand on this part (110kg.) and it would not break ( the walls are 2.8mm thick nominally)
One of the things that I find the most irritating about this process is what I call noodling (sort of like toothpaste extruded in funny loops when the toolpath is not exactly on an even step (anti-aliasing ?), which means I have to play around with the part orientation to try and minimize the effect.
Dimension machines like any commercial FDM machine have a heated build envelope 200 F +. The support shown here is the water soluble support I have no idea if PLA is water soluble...I think it is. Stratasys is very mum on what their support material is.
Very interesting to see a product from a commercial machine. By the looks of it, the support may actually be PLA. The surface of the ABS is quite matte. I wonder if the surface is locally heated to reduce the stepping created by the round extrusion "Wurst".
Hello ferret7
you will be welcome to get your build and show it on the site i have. http://scaledtankseurope.forum...