[NSRCA-discussion] Futaba BLS173SV centering problem

[Keith Hoard]

Welcome to pattern, Daniel.

-Keith Hoard
-klhoard at outlook.com

From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Whodaddy Whodaddy via NSRCA-discussion
Sent: Tuesday, February 14, 2017 04:23
To: Daniel Underkofler <underdw at gmail.com>; General pattern discussion <nsrca-discussion at lists.nsrca.org>
Subject: Re: [NSRCA-discussion] Futaba BLS173SV centering problem

U get wat u pay for.. Quality cost$ in most cases in life and in the hobby


G

Sent from my iPhone

On Feb 13, 2017, at 8:10 PM, Daniel Underkofler via NSRCA-discussion <nsrca-discussion at lists.nsrca.org<mailto:nsrca-discussion at lists.nsrca.org>> wrote:
Thanks ??? guys:
I ask about centering and it costs me $300 replace with adequate servos!  LOL
Seriously, appreciate the advice.
Dan

On Mon, Feb 13, 2017 at 6:35 PM, David Harmon via NSRCA-discussion <nsrca-discussion at lists.nsrca.org<mailto:nsrca-discussion at lists.nsrca.org>> wrote:
I had a serious problem with aluminum arms on certain JR servos…..the bag works very well.
Just hold a piece over the spline and press down on the arm….fixed.

David Harmon
Sperry, OK

From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org<mailto:nsrca-discussion-bounces at lists.nsrca.org>] On Behalf Of John Gayer via NSRCA-discussion
Sent: Monday, February 13, 2017 1:57 PM
To: General pattern discussion <nsrca-discussion at lists.nsrca.org<mailto:nsrca-discussion at lists.nsrca.org>>
Subject: Re: [NSRCA-discussion] Futaba BLS173SV centering problem

Take a small piece of a plastic bag and sandwich it between the splines and the output arm. That will reduce/eliminate the slop. Some plastic arms don't fit right either.
On 2/13/2017 12:43 PM, Earl Haury via NSRCA-discussion wrote:
Dan
�
I find that 0.13 dead band works well. Gear wear isn�t usually a problem with the 173, the Futaba aluminum arms don�t fit the splines tightly though � you might check this if using these arms. Lots of folks use the 173 on bipe ailerons (which tend to be smaller). Some time ago I measured servo current draw on each surface and ailerons were by far the highest � as Peter notes, big surface. At 7.5v they might be OK, I use the BLS171 which has 60 or so more oz-in torque. I�ve also found that servos slow a fair bit whenever current draw exceeds 60% of stall current � another reason to err on the high side.
�
Earl
�
From: Daniel Underkofler via NSRCA-discussion
Sent: Monday, February 13, 2017 11:58 AM
To: NSRCA
Subject: [NSRCA-discussion] Futaba BLS173SV centering problem
�
Guys,
I'm new to Futaba programable servos.� Have new BLS173SV on ailerons and have a bit of "slop" in the servo output.� I'm confident that the majority of the slop is in the servo, not the linkage.�
�
Should I need to replace gears after only a couple hundred flights?� Hard to tell, but seems like there is too much slop with power off, so adjusting settings may not be the answer.� Can't find the gearset on Futaba or Tower website anyway.� Anybody know the part number and how/where to order?
�
I was going to try reducing the deadband from .36 to .20.
Recommendations on programable parameter settings improve centering?
�
Thanks,� Dan
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