[NSRCA-discussion] Futaba BLS173SV centering problem

[David Harmon]

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] 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>
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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