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Old 11-20-2020, 06:01 PM   #1
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Default Motor Rotation Question

I am building a SCX 10 II, and in the process of buying the electronics. I am looking at a HH CrawlMaster Pro 13T motor. It is asking me for the timing and rotation, I will probably go with the 6 degree timing but am not sure of the rotation. Any Advice? Thanks
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Old 11-20-2020, 07:41 PM   #2
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Default Re: Motor Rotation Question

I'm pretty sure its forward rotation, its rigs like the TRX4 where they are reverse rotation due to the extra gear in the portals.

If not you can simply re-time the motor which is easy with HH motors.
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Old 11-21-2020, 05:31 AM   #3
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Default Re: Motor Rotation Question

Thanks for the response, it helps, wasn't quite sure
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Old 11-21-2020, 03:40 PM   #4
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Default Re: Motor Rotation Question

Rotation is determined by looking at it from the pinion side. My scx 10.2 runs clockwise


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Old 11-23-2020, 12:41 PM   #5
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Default Re: Motor Rotation Question

The timing on the HH motors is easily changed by rotating the end bell. When the timing is set to zero the motor rotation is mute meaning it will rotate either direction. I generally buy my HH motors with zero timing and then play with it once it is in the truck. I have four Crawlmater Pro 550 12t motors and love them.
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Old Yesterday, 01:47 AM   #6
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Default Re: Motor Rotation Question

Dumb question from the noob.



I know about gas engine timing but what does timing do on a brushed motor?
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Old Yesterday, 01:49 AM   #7
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Default Re: Motor Rotation Question

Quote:
Originally Posted by itr1275 View Post
Dumb question from the noob.



I know about gas engine timing but what does timing do on a brushed motor?
I have been wondering the same. I never even knew timing was a thing on electric motors
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Old Yesterday, 01:56 AM   #8
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Default Re: Motor Rotation Question

Motor runs faster in the direction it’s advanced and slower in the other.


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Old Yesterday, 02:01 AM   #9
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Default Re: Motor Rotation Question

Quote:
Originally Posted by austin-92 View Post
Motor runs faster in the direction it’s advanced and slower in the other.


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Oh okay. Thanks
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Old Yesterday, 02:37 AM   #10
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Default Re: Motor Rotation Question

John Holmes has a good video on it.

https://m.youtube.com/watch?v=G5-EZyPZBFI


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Old Yesterday, 11:28 AM   #11
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Default Re: Motor Rotation Question

Quote:
Originally Posted by austin-92 View Post
Motor runs faster in the direction it’s advanced and slower in the other.

So it's really like a fwd/reverse bias. Pretty cool, didn't know that.



I would imagine that most people rung it + a few degrees advanced. Assuming advanced means forwards.
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Old Yesterday, 12:33 PM   #12
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Default Re: Motor Rotation Question

Theres also an effect on brush wear for brushed motors. In brushless and brushed motors increasing timing also adds heat.
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Old Today, 10:19 AM   #13
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Default Re: Motor Rotation Question

Quote:
Originally Posted by itr1275 View Post
Dumb question from the noob.



I know about gas engine timing but what does timing do on a brushed motor?
Advance timing speeds up motor and better on brushes.

Retard timing slows motor and can cause heat issues.



Info from Holmes Hobbies

Timing your motor
Unless specified at the time of purchase, your brushed motor will have neutral (zero) timing and operate properly during clockwise (CW) and counterclockwise (CCW) rotation. *When the motor will rotate in one direction more than another, *timing advance is suggested. You can check the timing advance in many ways. *We suggest using more than one method until you are familiar with the task. *We suggest 3 volts for easy motor handling.*

1: The motor will spin faster “forwards” as compared to “reverse”.

2: The no-load amp draw will be higher than neutral timing.

3: A visual inspection reveals advanced brushes.
*

1: You can check to see if the motor spins slightly faster in forwards direction with a tachometer, or with motor sound. *A faster motor or machine will generate higher pitch noise. *Press your motor against a table while you change timing to listen for the increase in RPM to indicate advanced timing.*
2: Timing the motor with amp draw requires an amp meter, we suggest all motor owners to have this tool. *Loosen the endbell and spin the motor with low voltage. *Rotate the endbell slowly until you find the lowest amp draw. *This is neutral timing, and may not be exact to the motor markings because of motor variation and brush tilt. *10 to 20% higher no load amp draw in the advanced direction is a safe setting.
3: To advance the timing visually, rotate the brushes (endbell) in the opposite direction of motor shaft rotation. This energizes the segments sooner during rotation. If your motor rotates clockwise for forward locomotion, rotate the enbell counterclockwise in relation to the can. Most Holmes motors have marks on the can and endbell that indicate 12, 24, and 36 degrees for CCW pinion rotation. *About 6 degrees of timing is what we have found to be an optimal balance of brush life and reverse/ brake performance below 20,000 rpm. *Twenty degrees of timing is best for very fast motors such as the 13t TorqueMaster for Twin Hammers.*
*
*
[https://blog]




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