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Monday, November 29, 2010

Servormance max torque versus blocking torque

Following my post about the test results of the DS6125, I received several mails asking me about the difference between the max torque measured by Servormances and the max torque indicated by MKS. More generally the question is the same for all other servos tested with Servormances. So I think it was necessary to come back on that topic and give more information in order to avoid any confusion.

As we say in french, we can not compare apples with oranges, and this is a little bit the case here, so let me develop further:

On the manufacturer specifications the max torque mentionned is the blocking torque, that is to say the torque at which the servos cannot rotate anymore. The servormances team took another approach. Servormances max torque is very restrictive as the value published respects the following criteria:

  • Precision is within a range up to 1.5°
  • Speed is better that 0.8s for 60° of travel
  • Power Consummation is under 80% of the max consummation measured

Taking the DS6125 under 6v as an example, it means that, according to Servormances, this servos is working under normal conditions at 2.6 Kg/cm. In other words, you won't notice any degradation. Then the blocking torque can be much higher. Just to give you an idea, 2.6 kg represent twice the ballast the Ambrosia can carry. not bad !!!

This comment is valid for any servos. In fact, what is the most representative for us, the pilots, is the "usable" torque, and the objective of Servomances is to test servos in the very same conditions in order to be able to compare them.

To finish, I let you enjoy the demonstration of the blocking torque on the DS6125 with this video from the manufacturer. Pretty impressive !

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