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MasteroFlego's 1/10 T-55A build log (3D printed)

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MasteroFlego's 1/10 T-55A build log (3D printed)

Old 06-16-2022, 06:28 PM
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MasteroFlego
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Default MasteroFlego's 1/10 T-55A build log (3D printed)

Hello Everyone, welcome to the build log for my T-55A in 1/10 scale. I started this project quite a while ago (over a year!) and I'm still very far away from finishing.


current state

The design is quite unfinished, however I am quite close to being able to start printing the running gear. so far it's been from the ground up, as the parts near to the ground are closer to being printed. did I mention it's going to be 3D printed? I'll start with PLA, at least for the prototype. This project alone has made me much better at CAD, but also reinforced some of my bad habits (*** do I name stuff?). the most difficult part so far has been the turret, as it can't really be mathematically defined. There are many challenges yet to come, the main one being procrastination 😂

Before I can design more of the interior mechanics I need to select electronics. Any help in this area would be greatly appreciated. Currently I'm planning for 2 drive motors, 1 turret rotation motor, and probably a servo or linear actuator for elevation of the gun. I'd like the top speed to be anywhere from 10mph to anything faster than walking speed. I don't know how much it's going to weigh, but if I had to guess around 8-25lbs (I kind of have no idea).
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Old 06-17-2022, 09:25 AM
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Nice work so far - will be a great project! The hardest and most time consuming aspect will be tracks. I suggest you tackle those soon. PLA will work fine for tracks in 1:10. ASA is also a great material choice for tracks.
Best regards,
Bob
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Old 06-17-2022, 03:32 PM
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That is beautiful !!!
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MasteroFlego (06-21-2022)
Old 06-20-2022, 07:49 PM
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small update, I roughed out the loaders "cupola"



still have no clue what to use for electronics, perhaps I'll have to learn to code?
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Old 06-20-2022, 08:56 PM
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Originally Posted by MasteroFlego View Post
still have no clue what to use for electronics, perhaps I'll have to learn to code?
https://radindustries.wordpress.com/...beier-sfr-1-d/
Or
https://radindustries.wordpress.com/...m-olsens-mtcu/
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Old 06-20-2022, 09:27 PM
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I did see your post about the Olsens MTCU, that looks like the way to go. I'd like to know if the 60a rating is for both motors separately or together, and is that continuous?
Old 06-20-2022, 11:05 PM
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Originally Posted by MasteroFlego View Post
I did see your post about the Olsens MTCU, that looks like the way to go. I'd like to know if the 60a rating is for both motors separately or together, and is that continuous?
Separately and continuous.
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Old 06-21-2022, 09:13 PM
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Originally Posted by Rad_Schuhart View Post
Separately and continuous.
Awesome. So I discovered Servocity and now I can't leave... I think this motor will work for me, with no extra reduction, as it gives around the speed I'm looking for.
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Old 06-22-2022, 02:49 AM
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Originally Posted by MasteroFlego View Post
Awesome. So I discovered Servocity and now I can't leave... I think this motor will work for me, with no extra reduction, as it gives around the speed I'm looking for.
Ya they have a lot of stuff there
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Old 06-22-2022, 02:05 PM
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Masterfuego
1620 RPM is way too fast, unless I'm missing something. The data sheet says 5:1 reduction, so I assume the output would be 324 rpm - although I don't see that anywhere. For a tank you want approx 200-400 rpm at the output (Sprocket drive) shaft. Amazon may have similar in 200-400 rpm range. The stall amperage is 20A so I would choose a speed controller that can deliver at least 20 -25Amps max like this one
Sabertooth 2X25 V2 regenerative dual motor driver (dimensionengineering.com) - looks like it is also out of stock from DE for a long time. Robot marketplace and Hobby King have speed controllers as well.
You don't want to stall the motors often at 20A, but you also don't want to underpower them.

If using your above motor you would want to make the sprocket drive shaft 90 degrees to the motor. You can do this with bevel gears. A 1:1 bevel gear set would put your drive shaft at about ~325rpm, about perfect (assuming your motor choice is reduced 5:1 to 324rpm)

This ESC would work as well but may be a bit underpowered with your motors (only provides 12A max). But its in stock!
Sabertooth 2X12 R/C regenerative dual motor driver (dimensionengineering.com)

Those are pure motor speed controllers and no sound or other gizmos etc. They can power a servo or two for turret and gun elevation. But they will let you drive the model.
The DE speed controllers are easy to set up and offer good control for two motor model.
-Bob


Last edited by RC_BobM; 06-22-2022 at 02:14 PM.
Old 06-22-2022, 08:44 PM
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I would agree with Bob's assessment except that I think they are quoting the final RPMs as 1620, which is pretty fast. A T-55 is a decently fast tank, but I agree that 400RPM would suffice.
Old 07-17-2022, 03:06 PM
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Originally Posted by RC_BobM View Post
Masterfuego
1620 RPM is way too fast, unless I'm missing something. The data sheet says 5:1 reduction, so I assume the output would be 324 rpm - although I don't see that anywhere. For a tank you want approx 200-400 rpm at the output (Sprocket drive) shaft. Amazon may have similar in 200-400 rpm range. The stall amperage is 20A so I would choose a speed controller that can deliver at least 20 -25Amps max like this one
Sabertooth 2X25 V2 regenerative dual motor driver (dimensionengineering.com) - looks like it is also out of stock from DE for a long time. Robot marketplace and Hobby King have speed controllers as well.
You don't want to stall the motors often at 20A, but you also don't want to underpower them.

If using your above motor you would want to make the sprocket drive shaft 90 degrees to the motor. You can do this with bevel gears. A 1:1 bevel gear set would put your drive shaft at about ~325rpm, about perfect (assuming your motor choice is reduced 5:1 to 324rpm)

This ESC would work as well but may be a bit underpowered with your motors (only provides 12A max). But its in stock!
Sabertooth 2X12 R/C regenerative dual motor driver (dimensionengineering.com)

Those are pure motor speed controllers and no sound or other gizmos etc. They can power a servo or two for turret and gun elevation. But they will let you drive the model.
The DE speed controllers are easy to set up and offer good control for two motor model.
-Bob
Originally Posted by tankme View Post
I would agree with Bob's assessment except that I think they are quoting the final RPMs as 1620, which is pretty fast. A T-55 is a decently fast tank, but I agree that 400RPM would suffice.
edit: I'm pretty sure the quoted 1620rpm is the speed of the output shaft, not the motor.

My intended top speed is about 10mph (not exactly scale, as the top speed of T-55A is 31mph), and 1620rpm should get me there (I can even limit the top speed). The sprocket diameter at the track pins is about 57mm, but even if my calculations are off, it should be close enough. for the turret I'm going with two of GoBuilda's 2000 series 25-2s, one in standard mode, the other in continuous. They are far too fast to be scale, but there is some gear reduction for turret rotation, and I can limit speed too. For ESC I will try to get one of Kim Olsen's MTCU.

anyway, here are some design progress pics



WIP

Last edited by MasteroFlego; 07-17-2022 at 03:25 PM.
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Old 08-08-2022, 07:31 PM
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changed up the turret traverse servo setup, now braced

hange
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Old 08-09-2022, 07:37 PM
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roughed out the breech and gun mount. no plans currently for recoil system

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Old 08-10-2022, 12:50 AM
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Nice work. From the design of the breach it wouldn't be hard to add later.
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Old 09-12-2022, 08:03 PM
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Progress on the trunnion, and breech. Also have acquired a Radiomaster TX16S mkII, and Kim Olsen's MTCU.


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Old 09-13-2022, 08:00 PM
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the turret was slightly the wrong shape, now it's better. also I cut a hole in it.


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Old 09-17-2022, 04:39 PM
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mo progress, further changed the shape of the turret, and the wingy things
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Old 09-24-2022, 05:59 PM
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yet more tweaks to the turrets shape.


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