SES - Horns

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Both a driving horn and an idler horn assembly are supplied with the servos. The idler horn is not connected to the driving horn / output spline and is meant to add support to brackets.

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== Driving Horn ==

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|(% style="width:350px" %)[[image:LSS - driven horn.png]]|(% style="width:1128px" %)The aluminum driving horn is connected to the output shaft of the final gear in the gear train which is located within the servo. This output shaft has a specific cross section called a “spline” (specifically the “male” version of the spline), and the driving horn has the mating “female” spline. The details of the spline are found below. The driving horn is held in place using an M3 x 8mm pan head machine screw and has the SES standard mounting pattern described below.

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== Idler Horn ==

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|(% style="width:353px" %)[[image:LSS - idler.png||width="400"]]|(% style="width:1125px" %)(((

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The idler horn is not connected to the output spline and is therefore not driven. It is intended to act as a solid free-spinning connection point and can be installed in one of three locations on the servo. Installing the idler horn on the underside of the servo (as shown in the image), in line with the driving output shaft allows a Lynxmotion C-bracket to be used.

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The idler horn sub-assembly consists of a custom spacer, a 3mm ID x 8mm OD flanged ball bearing (Lynxmotion standard) and the idler horn itself. The idler horn is held in place using an M3 x 10mm pan head machine screw. Documentation in this wiki referring to the "idler horn" normally refers to the idler horn assembly.

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= Gearing =

The SES V2 system makes use of external gears in order to offset the axis of rotation and add additional support, as well as to increase the output torque. There are currently two sets of gears.

= Ratio =

|(% style="width:350px" %)[[image:LSS-Gear-16T-Gearbox.png]]|(((

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16T driven + 48T idler = 3:1 ratio

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This has the effect of increasing the torque by a factor of 3x while decreasing the maximum speed and overall angle by a factor of 3x. Therefore a full rotation of the output horn will result in a 120 degree travel of the larger 48 tooth gear. For high torque, high axial or radial loads, use the external gear bracket assembly. Center distance when using these two gears is 1.00 inches.

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|(% style="width:350px" %)[[image:LSS-Gear-32T-Gearbox.png]]|(((

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32T driven + 32T ideler = 1:1 ratio

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This has no effect on gearing, rpm or overall angle. Having both gears on the LSS creates a second driven axis. A 1:1 configuration can be used with the gear bracket where high axial or radial loads exist. Center distance when using these two gears is 1.00 inches.

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= Spline =

|(% style="width:350px" %)[[image:LSS-Gear-16T-Splines.png]]|The spline used on the LSS external driving gears (for example the 16 tooth gear in the image) is 24 teeth, which is compatible with Hitec components.

= Specs =

|Teeth|16|48|32|32

|Pitch|16|16|16|16

|Pressure Angle|20|20|20|20

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|Pitch Diameter|0.50"|1.50"|1"|1"

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|Outer Diameter|0.56"|1.56"|1.0625"|1.0625"

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|Spline|✓|✗|✓|✗

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|Idler (bearing)|✗|✓|✗|✓

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= LSS External Gear Mounting Options =

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There are various ways to mount the gears to the servo without using the gear bracket. Below are just some examples showing gears mounted with and without the gearbox bracket. Note that the gearbox bracket can be mounted on multiple sides of the servo. The gearbox bracket is used largely for applications with higher forces (axially and radially) and higher torque.

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[[image:LSS-Gear-All-Ratios.png||height="211" width="600"]]

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Wiki source code of SES - Horns

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