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Servo arms and splines. Is 90 degrees possible?

Old 03-23-2004, 09:07 AM
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HoboDog
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Default Servo arms and splines. Is 90 degrees possible?

I'm new to RC and building. I put servos in my Slow Stick, SoarStar and a Dandy Sport I just completed. In some cases I could not put the servo arms on at 90 degrees to the servo. The splines were not at 90 even after I centered the trims on my transmitter. Is this normal? Should I just pick the best but not perfect position?
These are all Hitek servos. HS-55, HS-81, HS-425BB.
Old 03-23-2004, 09:50 AM
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MinnFlyer
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Default RE: Servo arms and splines. Is 90 degrees possible?

I know that Futaba servos are set up so that the star wheel can be removed and rotated to different offsets. I also know that some servos do not have this feature. I'm not sure if Hitec does or not, so check.

If they don't, just get it close.
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Old 03-23-2004, 10:10 AM
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HoboDog
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Default RE: Servo arms and splines. Is 90 degrees possible?

I see the light! Now I know what those stars with numbers do. Unfortunately my Hitecs come with crosses with numbers. Only 4 choices on angle and the arms on the crosses are not long enough to give me the throw I need. The straight arms do but no choice on alignment.
OK, close is good enough.
Old 03-23-2004, 12:03 PM
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JNorton
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Default RE: Servo arms and splines. Is 90 degrees possible?

Did you try flipping the straight arms 180 degrees?

John
Old 03-23-2004, 01:14 PM
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iflyrc24
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Default RE: Servo arms and splines. Is 90 degrees possible?

Put your arms on as close as you can get to what you want and use the sub trim function to get them exact.

DEG
Old 03-23-2004, 02:40 PM
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HoboDog
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Default RE: Servo arms and splines. Is 90 degrees possible?

Yes, I have flipped them 180. That results in them being off the opposite way. Thanks for asking.
I ended up leaving them a few degrees off center and adjusted my linkage. I still have enough throw in both directions after doing the EPA. I just wanted them to look centered when the control surface were. Being too picky.
Thanks for the help.
Old 03-23-2004, 04:00 PM
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Default RE: Servo arms and splines. Is 90 degrees possible?

If you have Futaba, choosing the correct position to get 90 degrees should be easy. If the number of splines are an odd number, placement can be very close to 90 degrees at some setting. Futaba, DAD, GWS, FMA and most Tower hobby servos have odd numbered splines. I've never checked the Hitec for number of splines but have found that Hitec, Appolo and Hobbico arms seem to be interchangeable. Also, all DAD, FMA, GWS and Futaba standard size servo arms seem to be interchangeable. Airtonics is a breed of its own. Have not check JR .
Old 03-24-2004, 08:13 AM
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Default RE: Servo arms and splines. Is 90 degrees possible?

I think Hitec is 24 splines. Even number. They are hard to count.

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