[NSRCA-discussion] Futaba BLS173SV centering problem

[John Gayer]

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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