Re: TAMIYA M1A2 Displaymodel
Posted: Tue Dec 24, 2019 8:43 am
What I don't like is the panel on the left rear engine deck of this model, to the right of the rectangular engine grille. This part has a smooth surface and seems to be different from an actual tank. I feel that it is a complete omission as a model.
A plastic plate is attached to the back to insulate the switch from being turned on when the switch is kicked during barrel recoil back. The distance between the fixed point and the contact point of the leaf spring switch and the leaf spring stiffness were adjusted by trial and error, and it worked properly.
However, I still feel that mechanical contact makes operation unstable. I thought that if a relay switch could be used, it would work better. When I made ATRC (anti-track recoil circuit) before, there was an extra relay switch (5V DPDT relay). It doesn't need to be DPDT, and SPDT is actually good, but I tried using this one.
As a result, it works just like a video. In the video below, the mechanical contacts have been removed. The trigger of the relay switch uses one of the USM-HL2 outputs (pulse), so the contact time can be adjusted in 0.1 second units by software. Since there is less wiring and no mechanical contact is required here, the track recoil reliability and stability seem to be better.
The black box is the DPDT and the green one is the connection terminal, all of which are attached to the PCB. In this picture these are temporarily placed on the turret to check the operation. The back of the PCB is a simple wiring between the connection terminal and DPDT and a diode (1N4148) for resistance and reverse current prevention. With this method, all of these can be stored in the under hull with the RX 18 and sound board, so the wiring between the turret and the hull does not increase.
The remaining work to be done on this tank model is painting (including weathering). I also want to use a slip ring to allow the turret to rotate 360 degrees. However, adopting a slip ring has two problems.
First, the vertical space from the turret to the under hull is small. Second, when I place the battery in the turret, I need a slip ring with a cable that can withstand the power current. (However, its dimensions are necessarily larger)
Since this model (full operation) was originally designed to set the battery in the turret, it is generally better to place the battery in the turret even if it is modified.
Since many AFV modelers have pointed out, I modified them. I just put the extra etching parts there.
Also, it is a small part, but I added a handle to three CIPs.
I intend to re-add the track recoil function to this M1A2. On the HengLong RX18, the micro switch at the end of the barrel is turned on when the barrel is recoiled, causing a track recoil. However, because the switch is at the end, the hull recoils when the barrel reaches the end. HengLong's track recoil is so exaggerated that many people dislike it. When I put TORRO's RX18 on this Abrams, it seems that it is not so exaggerated track recoil, so I will try track recoil. A switch is placed in front of the barrel so that a track recoil also occurs when the barrel recoil begins. The rigidity setting of the switch metal leaf spring is subtle. If the deformation is not within the elastic range, it will plastically deform during repetition and track recoil will not occur. If the switch contact time is too short, recoil will not occur.A plastic plate is attached to the back to insulate the switch from being turned on when the switch is kicked during barrel recoil back. The distance between the fixed point and the contact point of the leaf spring switch and the leaf spring stiffness were adjusted by trial and error, and it worked properly.
However, I still feel that mechanical contact makes operation unstable. I thought that if a relay switch could be used, it would work better. When I made ATRC (anti-track recoil circuit) before, there was an extra relay switch (5V DPDT relay). It doesn't need to be DPDT, and SPDT is actually good, but I tried using this one.
As a result, it works just like a video. In the video below, the mechanical contacts have been removed. The trigger of the relay switch uses one of the USM-HL2 outputs (pulse), so the contact time can be adjusted in 0.1 second units by software. Since there is less wiring and no mechanical contact is required here, the track recoil reliability and stability seem to be better.
The black box is the DPDT and the green one is the connection terminal, all of which are attached to the PCB. In this picture these are temporarily placed on the turret to check the operation. The back of the PCB is a simple wiring between the connection terminal and DPDT and a diode (1N4148) for resistance and reverse current prevention. With this method, all of these can be stored in the under hull with the RX 18 and sound board, so the wiring between the turret and the hull does not increase.
The remaining work to be done on this tank model is painting (including weathering). I also want to use a slip ring to allow the turret to rotate 360 degrees. However, adopting a slip ring has two problems.
First, the vertical space from the turret to the under hull is small. Second, when I place the battery in the turret, I need a slip ring with a cable that can withstand the power current. (However, its dimensions are necessarily larger)
Since this model (full operation) was originally designed to set the battery in the turret, it is generally better to place the battery in the turret even if it is modified.