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Ron
 Ron
(@zander)
Father of a miniature Wookie
Joined: 3 years ago
Posts: 6530
 

@old-tech I think those motors are windshield wiper motors. They have been used a lot in the past, they do have a huge amount of torque, around 6 ft lb if memory serves.

 

First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
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Old Tech
(@old-tech)
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WW motors only have a 3 or 4 rpm output. I looked for one forever but could not find anything in the 20-30 rpm.

I could get slower motors, but they are all right hands drives. That being said, I could put one on each end, but I prefer not to. I will have to use PWM to slow them. I can only get 3" #35 sprockets and at 50 rpm the treads will move too fast. However, that is a way off until I get the beginner built.

As to the little crawler I could get slower motors, but it is a waste of $'s as I do not intend to use the little bot in the end.

This post was modified 3 months ago by Old Tech

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Ron
 Ron
(@zander)
Father of a miniature Wookie
Joined: 3 years ago
Posts: 6530
 

@old-tech I could be wrong, but to make a motor turn the other way just reverse the polarity.

First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
Sure you can learn to be a programmer, it will take the same amount of time for me to learn to be a Doctor.


   
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Old Tech
(@old-tech)
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Joined: 4 months ago
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Topic starter  

@zander I was referring to the side the drive shaft comes out of the gearbox.

The ones I prefer have left and right shafts.

Not the rotation of the armature.

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Ron
 Ron
(@zander)
Father of a miniature Wookie
Joined: 3 years ago
Posts: 6530
 

@old-tech Ah, of course. For those wiper motors, one gets mounted front right, the other rear left. All my tanks are that way, and NONE have four motors.

Regarding the motor RPM, use the appropriate sized gears to bring the tread speed up to what you want. If, as you say, the motors are only 3 RPM and you need 30, then the driven gear must have ten times as many teeth as the driving gear. Off the top of my head, that sounds like a realistic arrangement, but if more is needed, then a gear cluster will be needed. Typically most tank builders want more speed, but you have a particular case.

Keep us posted, I find most people who come here to get help with a project never give us feedback about the finished product, whether it worked or not.

First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
Sure you can learn to be a programmer, it will take the same amount of time for me to learn to be a Doctor.


   
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Old Tech
(@old-tech)
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Topic starter  

I had not though of gearing. I was going to use a 3- or 4-inch sprockets and get a motor internally geared to 40 rpm.

Then no gearing would be necessary. I could use PWM to slow it to a proper speed. Wiper blade motors are more compact, and I like that but add gearing to them and it gets complicated.

Now to your post: Do you have tanks? If so, how large?

You are right about follow up posting. I am a member of a generator forum, and it seems once we solve a problem for a person seeking info, they never come back and give us any results.

Generator Forum | Power Equipment Forum

This post was modified 3 months ago 2 times by Old Tech

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Ron
 Ron
(@zander)
Father of a miniature Wookie
Joined: 3 years ago
Posts: 6530
 

@old-tech My tanks are just the usual small toys. Don't forget you need to use the ledcwrite i/o to use it effectively.

First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
Sure you can learn to be a programmer, it will take the same amount of time for me to learn to be a Doctor.


   
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Old Tech
(@old-tech)
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Topic starter  

Today I did further research and found two motors more reasonably priced.

$30.00 each and smaller, but 75 rpm which is faster than I wanted but I can make it work.

Found them under awning motors,

They do not offer left and right gear boxes, but I will just mount one on each thread, front to rear.

This post was modified 3 months ago 3 times by Old Tech

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