[NSRCA-discussion] Futaba BLS173SV centering problem

Tue Feb 14 01:23:13 AKST 2017

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> 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> 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] 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
>> 
>> ï¿½
>> 
>> I find that 0.13 dead band works well. Gear wear isnï¿½t usually a problem with the 173, the Futaba aluminum arms donï¿½t fit the splines tightly though ï¿½ 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 ï¿½ 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. Iï¿½ve also found that servos slow a fair bit whenever current draw exceeds 60% of stall current ï¿½ another reason to err on the high side.
>> 
>> ï¿½
>> 
>> Earl
>> 
>> ï¿½
>> 
>> From: Daniel Underkofler via NSRCA-discussion
>> 
>> Sent: Monday, February 13, 2017 11:58 AM
>> 
>> To: NSRCA
>> 
>> Subject: [NSRCA-discussion] Futaba BLS173SV centering problem
>> 
>> ï¿½
>> 
>> Guys,
>> 
>> I'm new to Futaba programable servos.ï¿½ Have new BLS173SV on ailerons and have a bit of "slop" in the servo output.ï¿½ I'm confident that the majority of the slop is in the servo, not the linkage.ï¿½
>> 
>> ï¿½
>> 
>> Should I need to replace gears after only a couple hundred flights?ï¿½ Hard to tell, but seems like there is too much slop with power off, so adjusting settings may not be the answer.ï¿½ Can't find the gearset on Futaba or Tower website anyway.ï¿½ Anybody know the part number and how/where to order?
>> 
>> ï¿½
>> 
>> I was going to try reducing the deadband from .36 to .20.
>> 
>> Recommendations on programable parameter settings improve centering?
>> 
>> ï¿½
>> 
>> Thanks,ï¿½ Dan
>> 
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