RCCrawler Forums

Tommy R · 03-22-2011, 07:49 AM

Hey y'all,

I have a Hitec 5645 servo winch powered by one of heyok's high voltage winch control units. It's currently running 7.0v, which should be fine for the Hitec motor. The problem is that it studders when rotating in one direction. The other direction is silky smooth. I'm not sure what could cause that. It would seem if it's a bad solder joint or something like that, then both rotation directions would have the problem, not just one.

Here's the only video I have of the problem. Fast forward to the ~2:05 mark and listen closely as the winch un-spools to lower the truck. You can hear the studdering, but you can't really see it in the video.
http://www.youtube.com/watch?v=T_O1v3eYJzI

Anyone have an idea what could cause this?

justinart24 · 03-22-2011, 10:26 AM

All I can say is drop the voltage down to 6v. 7v seems a little hight for a 5645 IMO.

Tommy R · 03-22-2011, 10:28 AM

Quote:

Originally Posted by justinart24

All I can say is drop the voltage down to 6v. 7v seems a little hight for a 5645 IMO.

No kidding? Could the higher voltage cause it to studder in one direction, but work fine in the other? FYI, it does the under load or free wheeling. I don't mind dropping the voltage down if I have to, but I was hoping not to.

TURTLE · 03-22-2011, 10:50 AM

Yeah maybe try dropping the voltage down, if it still does it pull it apart check the gears and your solder connections. If you can't find a problem it might just be better to replace the servo and start fresh.
Also watch it when it is moving and see if its snagging on anything...

You don't want it failing during scale nats.

Tommy R · 03-22-2011, 10:55 AM

Quote:

Originally Posted by TURTLE

Yeah maybe try dropping the voltage down, if it still does it pull it apart check the gears and your solder connections. If you can't find a problem it might just be better to replace the servo and start fresh.
Also watch it when it is moving and see if its snagging on anything...

You don't want it failing during scale nats.

Will do. I'll give the reduced voltage a try. It's definitely not snagging on anything...I made sure to verify that. It's rather odd. I'll drop the voltage first and if that doesn't help, I'll re-solder it. The winch is brand new, BTW. It worked fine before I modified it for servo duty.

rckjeep · 03-22-2011, 10:57 AM

Mine is doing the same thing. I'm running it thru the the RX on 2S. I"m going to take it apart today and try to figure it out.

heyok · 03-22-2011, 11:07 AM

I hear you guys - I know the problem is out there and want to solve it. So far I haven't been able to duplicate it with my test winch.

I have a winch servo coming to me in the mail that has this stuttering symptom and will devote some time to getting things fixed up. I will be watching closely to see if I can learn anything from what you guys find.

Tommy R · 03-22-2011, 11:13 AM

Thanks for the thoughts, Al. Truth be told, I really don't suspect your controller in any of this. I don't really know what the issue ultimately is, but I'll try a few things and go from there.

hotwheels000 · 03-23-2011, 05:55 PM

Quote:

Originally Posted by Tommy R

Hey y'all,

I have a Hitec 5645 servo winch powered by one of heyok's high voltage winch control units. It's currently running 7.0v, which should be fine for the Hitec motor. The problem is that it studders when rotating in one direction. The other direction is silky smooth. I'm not sure what could cause that. It would seem if it's a bad solder joint or something like that, then both rotation directions would have the problem, not just one.

Here's the only video I have of the problem. Fast forward to the ~2:05 mark and listen closely as the winch un-spools to lower the truck. You can hear the studdering, but you can't really see it in the video.
http://www.youtube.com/watch?v=T_O1v3eYJzI

Anyone have an idea what could cause this?

I have been having the same issues Tommy.I have tried a few things to isolate/eliminate certian causes with Als advice. Tried reversing the wires on the motor.reversing servo direction,higher/lower voltages,direct conect to a 9V batt etc...He has been great to work with and I am confident if the issue is infact with the controller he will figure it out.

Quote:

Originally Posted by heyok

I hear you guys - I know the problem is out there and want to solve it. So far I haven't been able to duplicate it with my test winch.

I have a winch servo coming to me in the mail that has this stuttering symptom and will devote some time to getting things fixed up. I will be watching closely to see if I can learn anything from what you guys find.

If you are refering to mine,I sent them yesterday,hopefully you see them soon.I included both a 645 and a JR.Thanks for all your dedication and help.

Bananaclip · 03-23-2011, 06:35 PM

Same problem here! I hooked up mine last week in a brand new airtronics ht servo and am having the exact problem! My controller is the original 6v design. One direction butter smooth and the other stu stu stutters.

hotwheels000 · 03-23-2011, 09:23 PM

I have had no problems with the 2 original 6v controllers I have.

JonehRC · 03-23-2011, 09:40 PM

i also want to know this ...
it's a matter of curiousity .. one way ok, the other way not.. thats totally weird

david_387 · 03-23-2011, 09:58 PM

hey guys..
I got a Hitec 645 servo winch on my rig, but it is not working sometimes(don't know why.....)
I am running 3s Lipo and a BEC(6.3v) and FXR and Hitec 7955(steering servo).
So, do u guys think I need one more BEC for servo winch only?

03-22-2011, 07:49 AM	#1
Tommy R I wanna be Dave Join Date: Aug 2008 Location: Austin, TX, USA Posts: 4,273	Servo Winch Studdering in One Direction Hey y'all, I have a Hitec 5645 servo winch powered by one of heyok's high voltage winch control units. It's currently running 7.0v, which should be fine for the Hitec motor. The problem is that it studders when rotating in one direction. The other direction is silky smooth. I'm not sure what could cause that. It would seem if it's a bad solder joint or something like that, then both rotation directions would have the problem, not just one. Here's the only video I have of the problem. Fast forward to the ~2:05 mark and listen closely as the winch un-spools to lower the truck. You can hear the studdering, but you can't really see it in the video. http://www.youtube.com/watch?v=T_O1v3eYJzI Anyone have an idea what could cause this?

03-22-2011, 10:26 AM	#2
justinart24 I wanna be Dave Join Date: Feb 2009 Location: Cowtown, USA Posts: 2,780	All I can say is drop the voltage down to 6v. 7v seems a little hight for a 5645 IMO.

03-22-2011, 10:50 AM	#4
TURTLE Gettin’ back on the horse Join Date: Feb 2006 Location: Hoonsville Posts: 6,671	Yeah maybe try dropping the voltage down, if it still does it pull it apart check the gears and your solder connections. If you can't find a problem it might just be better to replace the servo and start fresh. Also watch it when it is moving and see if its snagging on anything... You don't want it failing during scale nats.

03-22-2011, 10:57 AM	#6
rckjeep I wanna be Dave Join Date: Jun 2004 Location: San Jose Posts: 5,207	Mine is doing the same thing. I'm running it thru the the RX on 2S. I"m going to take it apart today and try to figure it out.

03-22-2011, 11:07 AM	#7
heyok I wanna be Dave Join Date: May 2007 Location: Vancouver, BC Posts: 2,379	I hear you guys - I know the problem is out there and want to solve it. So far I haven't been able to duplicate it with my test winch. I have a winch servo coming to me in the mail that has this stuttering symptom and will devote some time to getting things fixed up. I will be watching closely to see if I can learn anything from what you guys find.

03-22-2011, 11:13 AM	#8
Tommy R I wanna be Dave Join Date: Aug 2008 Location: Austin, TX, USA Posts: 4,273	Thanks for the thoughts, Al. Truth be told, I really don't suspect your controller in any of this. I don't really know what the issue ultimately is, but I'll try a few things and go from there.

03-23-2011, 06:35 PM	#10
Bananaclip I wanna be Dave Join Date: Dec 2006 Location: Where the sheep run scared. Posts: 3,008	Same problem here! I hooked up mine last week in a brand new airtronics ht servo and am having the exact problem! My controller is the original 6v design. One direction butter smooth and the other stu stu stutters.

03-23-2011, 09:23 PM	#11
hotwheels000 I wanna be Dave Join Date: Aug 2006 Location: under a rock and a hard place Posts: 5,443	I have had no problems with the 2 original 6v controllers I have.

03-23-2011, 09:40 PM	#12
JonehRC Pebble Pounder Join Date: Dec 2009 Location: KK Sabah North Borneo Posts: 162	i also want to know this ... it's a matter of curiousity .. one way ok, the other way not.. thats totally weird

03-23-2011, 09:58 PM	#13
david_387 Quarry Creeper Join Date: Feb 2009 Location: Seattle, WA Posts: 374	hey guys.. I got a Hitec 645 servo winch on my rig, but it is not working sometimes(don't know why.....) I am running 3s Lipo and a BEC(6.3v) and FXR and Hitec 7955(steering servo). So, do u guys think I need one more BEC for servo winch only?

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Thread: Servo Winch Studdering in One Direction