RCCrawler Forums

goldmember · 07-27-2009, 06:16 AM

I was hoping to prove people wrong and get by using the Hitec 225mg servo with my dna dig. But I'm starting to see why people use a full size servo (I think). I currently have the end points set pretty good imo. Any more and the servo starts to chatter.

Whats happening is when I get up to a rock face, it seem like the tourque is pushing the servo out some and making my truck go to free wheel mode.

If I press the dig switch again it seems to lock back up, only to back off after trying the same obstable again.

bigflex · 07-27-2009, 06:22 AM

Do you have an external BEC installed?

goldmember · 07-27-2009, 06:47 AM

Yes, I have a castle bec set at 6v. I'm running a Dx3r with a Sr3500 receiver and tekin combo.

I'm still pretty new to the electronics side of things, how would a BEC affect this setup?

Thanks!

Colby · 07-27-2009, 07:09 AM

Try to throw in a full size servo and see what that does for ya, i think the servo may just be too weak?

awd199 · 07-27-2009, 09:57 AM

How old is the dig? If it is one of the older ones with the aluminum internals, they could be wore to the point that they are slipping. Mine was doing the same thing before I rebuild the dig with the new steel parts.

goldmember · 07-27-2009, 11:18 AM

Quote:

Originally Posted by awd199

How old is the dig? If it is one of the older ones with the aluminum internals, they could be wore to the point that they are slipping. Mine was doing the same thing before I rebuild the dig with the new steel parts.

That could be it. The dig is pretty new. Only has 3 runs on it for a short amount of time, but I do know I have the aluminum interals. I should probably tear it down just to check.

trailduster79 · 07-27-2009, 02:50 PM

I was running a HS-311 full size servo that only has like 40 oz of torque. It wasn't enough for my Hot Racing dig. I switched it out for a Towerpro with 200 oz of torque and it was a night and day difference.

Definitely worth upgrading the servo!

HBRC · 07-27-2009, 04:31 PM

i run a hitech 225MG on my OG VF(now DNA) dig with the original aluminum internals. no issues.

is your servo mounted to the dig/tranny, or the chassis? ideally, keep it on the tranny so there's no issues when the chassis flexes.

If i was to do it over again, i'd throw a full size hi torque servo at it though, just for peace of mind.

EvilTwin v2 · 07-27-2009, 04:56 PM

I had similiar happening with my dig going to freewheel when on steep climbs. My problem was due to a bad battery. When the motor would try to start, the receiver would go into failsafe, centering the dig servo.

crawldad91 · 07-27-2009, 06:03 PM

i have been using the mini servo in my vf for a year now with no issues.

my driver cog internals were twice as bad as the one pictured above!

that was making mine skip outta gear too ,till i replaced them with the new steel stuff, no issues now

goldmember · 07-27-2009, 08:56 PM

Quote:

Originally Posted by HBRC

i run a hitech 225MG on my OG VF(now DNA) dig with the original aluminum internals. no issues.

is your servo mounted to the dig/tranny, or the chassis? ideally, keep it on the tranny so there's no issues when the chassis flexes.

If i was to do it over again, i'd throw a full size hi torque servo at it though, just for peace of mind.

Well maybe it's not the internals...I have it mounted to the chassist via a custom aluminum plate and the plate does flex some as you move the dig in it's 3 positions.

Ugh...I need more hours in the day to tinker with this stuff!

crawldad91 · 07-28-2009, 06:05 AM

also if you are running a dx3r radio set your endpoints at 40 for the dig

EvilTwin v2 · 07-28-2009, 06:13 AM

Quote:

Originally Posted by crawldad91

also if you are running a dx3r radio set your endpoints at 40 for the dig

There are far too many factors for that to be true in every case. If he's running a different servo horn or using a different hole on his, it'll be a different end point setting.

Biscuit · 07-29-2009, 04:22 PM

That chassis flex you mentioned is probably your problem seeing as how you have it (servo) mounted to the chassis. If you have your dig set-up correctly and not running some weird angle on your link the 225 should do fine. I ran my dig for right at a year with the original servo that I installed on it.

goldmember · 07-29-2009, 07:16 PM

Sounds good. I'll try redesigning my servo mount and if that doesn't solve it I'll try pulling it all apart. But it is in high tourque situations my rear wheels stop pushing.

07-27-2009, 06:16 AM	#1
goldmember Rock Crawler Join Date: Feb 2005 Location: Oxford, MA Posts: 802	Is my servo not strong enough for my DNA dig? I was hoping to prove people wrong and get by using the Hitec 225mg servo with my dna dig. But I'm starting to see why people use a full size servo (I think). I currently have the end points set pretty good imo. Any more and the servo starts to chatter. Whats happening is when I get up to a rock face, it seem like the tourque is pushing the servo out some and making my truck go to free wheel mode. If I press the dig switch again it seems to lock back up, only to back off after trying the same obstable again.

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07-27-2009, 06:22 AM	#2
bigflex I wanna be Dave Join Date: Jun 2005 Location: drillin Holes for the man Posts: 2,736	Do you have an external BEC installed?

07-27-2009, 06:47 AM	#3
goldmember Rock Crawler Join Date: Feb 2005 Location: Oxford, MA Posts: 802	Yes, I have a castle bec set at 6v. I'm running a Dx3r with a Sr3500 receiver and tekin combo. I'm still pretty new to the electronics side of things, how would a BEC affect this setup? Thanks!

07-27-2009, 07:09 AM	#4
Colby WOOPOOW!! Join Date: Nov 2008 Location: Atlanta, GA Posts: 4,218	Try to throw in a full size servo and see what that does for ya, i think the servo may just be too weak?

07-27-2009, 09:57 AM	#5
awd199 Quarry Creeper Join Date: Oct 2008 Location: Southwest VA Posts: 361	How old is the dig? If it is one of the older ones with the aluminum internals, they could be wore to the point that they are slipping. Mine was doing the same thing before I rebuild the dig with the new steel parts.

07-27-2009, 02:50 PM	#7
trailduster79 Rock Crawler Join Date: Jan 2005 Location: Windsor, VA Posts: 573	I was running a HS-311 full size servo that only has like 40 oz of torque. It wasn't enough for my Hot Racing dig. I switched it out for a Towerpro with 200 oz of torque and it was a night and day difference. Definitely worth upgrading the servo!

07-27-2009, 04:31 PM	#8
HBRC Quarry Creeper Join Date: Aug 2007 Location: right above my feet Posts: 262	i run a hitech 225MG on my OG VF(now DNA) dig with the original aluminum internals. no issues. is your servo mounted to the dig/tranny, or the chassis? ideally, keep it on the tranny so there's no issues when the chassis flexes. If i was to do it over again, i'd throw a full size hi torque servo at it though, just for peace of mind.

07-27-2009, 04:56 PM	#9
EvilTwin v2 I wanna be Dave Join Date: Oct 2005 Location: EvilCrawlerDesigns@comcast.net Posts: 3,510	I had similiar happening with my dig going to freewheel when on steep climbs. My problem was due to a bad battery. When the motor would try to start, the receiver would go into failsafe, centering the dig servo.

07-27-2009, 06:03 PM	#10
crawldad91 Quarry Creeper Join Date: Mar 2008 Location: richmond Posts: 240	i have been using the mini servo in my vf for a year now with no issues. my driver cog internals were twice as bad as the one pictured above! that was making mine skip outta gear too ,till i replaced them with the new steel stuff, no issues now

07-28-2009, 06:05 AM	#12
crawldad91 Quarry Creeper Join Date: Mar 2008 Location: richmond Posts: 240	also if you are running a dx3r radio set your endpoints at 40 for the dig

07-29-2009, 04:22 PM	#14
Biscuit Rock Crawler Join Date: Feb 2008 Location: Anniston, Alabama Posts: 799	That chassis flex you mentioned is probably your problem seeing as how you have it (servo) mounted to the chassis. If you have your dig set-up correctly and not running some weird angle on your link the 225 should do fine. I ran my dig for right at a year with the original servo that I installed on it.

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07-29-2009, 07:16 PM	#15
goldmember Rock Crawler Join Date: Feb 2005 Location: Oxford, MA Posts: 802	Sounds good. I'll try redesigning my servo mount and if that doesn't solve it I'll try pulling it all apart. But it is in high tourque situations my rear wheels stop pushing.

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