RCCrawler Forums

Brandon · 07-21-2008, 05:18 PM

From the start I was on a budget like most guys and just ordered the axle’s instead of the full kit. Once I got them I realized I had some fabricating to do! Nothing wrong with that, ended up getting creative and figured out a BTA (behind the axle) or OTA (over the axle) steering setup. Not sure which it is but who cares, it works

As I started mocking up different ideas I realized a few issues. I definitely wanted to eliminate the clamps that mount to the axle tube mostly for clearance reasons. The other problem was that there are not any holes on the axle to mount anything to!

First bracket was made from some aluminum angle. It basically gives me a mount for one side of the servo, bolts to the gear case using the upper link mount holes and relocates the upper link mount further back out of the servos way. The relocation of the upper link mount might be a problem for some people that don’t want to make new links

It also messes with the suspension geometry, however it’s the front so I was not too concerned, the steering advantages were worth it to me.

Here you can see some progress on the steering tie rod. My knuckles are flipped and so are the lower link mounts. I also drilled a new hole in the knuckles and cut the old ones off. The tie rod is 3/16” SS tubing and I used some 3mm threaded links from a tlt kit that are pinched inside at the bend. They aren’t going anywhere. You can also see that the servo is raised high enough off the axle the the tie rod can move freely between the gear case and bottom of the servo.

Brandon · 07-21-2008, 05:19 PM

Now for the bracket to support the other side of the servo. Because I flipped my lower link mounts I was able to build this mount from aluminum channel. The axial 6mm spacers worked perfectly. I had to clearance the bracket in a few spots for the shocks to clear. Its nothing fancy at all.

Next I brazed a tlt link mount onto the tie rod for the drag link to attach to.

A few preliminary finished product pics.

Only picture I have that shows the part removed from the bracket for the shock to clear. This wont be an issue if you have enough separation at the tops of your shocks. You can also see the location of the new holes I drilled in the knuckles.

I will update this thread with some new pictures soon. I have made a few more slight changes and fixed the drag link angle slightly.

Also notice the correct ackerman angles at full lock. I personally like the ackerman angles this setup allows. The main advantage is steering uphill while sidehilling. You can square up the tire to the climb, however the ackerman on the stock steering setup you can turn sharper since the outside tire is at a greater angle.

Feel free to discuss and ask questions.

carver · 07-21-2008, 05:53 PM

That is very trick. Your very creative. can you make me a kit for my axles?

Miller Tyme · 07-21-2008, 07:12 PM

I like the idea. Not quite what I envisioned, But I like it. It is similar to what I've been thinking of, but I want to leave the servo bottomed out on the axle and bow the link up and over the servo.

Brandon · 07-22-2008, 09:23 AM

Quote:

Originally Posted by Georgerm

very nice.

Quote:

Originally Posted by carver

That is very trick. Your very creative. can you make me a kit for my axles?

Thank you. I am pretty sure TCS is working on something similar so it should be available soon.

Quote:

Originally Posted by Miller Tyme

I like the idea. Not quite what I envisioned, But I like it. It is similar to what I've been thinking of, but I want to leave the servo bottomed out on the axle and bow the link up and over the servo.

Nice idea, be sure to post pics in this thread when you get it done! There is definitely more than one way to do this.

Da Hermit · 07-24-2008, 02:57 AM

Thanks luv. for the ideas.
it looks to be an advantage out on the rocks.
Show us how it worked when you have time.

genki · 07-24-2008, 03:05 AM

Brilliant, looks awesome...great fabrication ;)

Mnster · 07-24-2008, 03:45 AM

Did you drill and tap the extra holes in you knuckle or did they come that way? Been thinking about drilling some holes to bring the link closer to the truck then doing a reversed setup of what you have. Over the axle steering in front of the axle.

Brandon · 07-24-2008, 11:43 AM

Quote:

Originally Posted by Da Hermit

Thanks luv. for the ideas.
it looks to be an advantage out on the rocks.
Show us how it worked when you have time.

Thanks! What do you want to see? It worked great at the past two comps. Not having a tie rod to get caught on is great

Quote:

Originally Posted by Mnster

Did you drill and tap the extra holes in you knuckle or did they come that way? Been thinking about drilling some holes to bring the link closer to the truck then doing a reversed setup of what you have. Over the axle steering in front of the axle.

Yeah I added the extra holes. I wanted to keep the tie rod as straight as possible so adding those really helped.

maro69camaro · 07-24-2008, 01:22 PM

it will never work

. j/k guys this setup works great i have seen it up close and it very nice..

braceysdad · 07-24-2008, 01:36 PM

In, thanks for the chance...

FrankyRizzo · 07-24-2008, 04:20 PM

Checked my mail..... mine is not here yet.

BoNuS LiNe · 07-24-2008, 05:04 PM

Quote:

Originally Posted by FrankyRizzo

Checked my mail..... mine is not here yet.

i'll save you the postage , i'll pick it up from you this weekend

Brandon · 07-25-2008, 02:08 AM

Quote:

Originally Posted by FrankyRizzo

Checked my mail..... mine is not here yet.

I will work on it this weekend. BTW, the thing you sent me today is already built

Quote:

Originally Posted by BoNuS LiNe

i'll save you the postage , i'll pick it up from you this weekend

Make sure you check it out, not sure why you haven't done it yet???

Da Hermit · 07-25-2008, 03:17 AM

[quote=Nluvwithxlr8ing;1273546]Thanks! What do you want to see? It worked great at the past two comps. Not having a tie rod to get caught on is great

quote]

My daughter keeps me from saying i have time to make my own. Do you have an extra one that I can buy off of ya?

Stormin2u · 07-25-2008, 05:55 AM

Once again very nice mod that looks great.

BoNuS LiNe · 07-25-2008, 10:36 AM

Quote:

Originally Posted by Nluvwithxlr8ing

Make sure you check it out, not sure why you haven't done it yet???

im a bolt on kinda guy

KenDobson · 07-25-2008, 01:54 PM

Have you ever thought about using one servo per side, then you could have few different mixs set up similiar to what the airplane guys do. Mix in different amounts of throws and end points. You might have to use a dx6 or something but was wondering if it has been done or could be benefiacal.

TURBOFEST · 08-08-2008, 09:06 AM

I just saw this thread...

This is just awesome...its inovation like this that makes me love RC crawling. Nice work!!

finishline · 08-09-2008, 06:33 PM

looks great brandon hope to get some berg action soon myself

07-21-2008, 05:18 PM	#1
Brandon Im Brandon Join Date: Feb 2005 Location: Colfax, CA Posts: 8,156	Nluv's BTA/OTA Berg Steering setup From the start I was on a budget like most guys and just ordered the axle’s instead of the full kit. Once I got them I realized I had some fabricating to do! Nothing wrong with that, ended up getting creative and figured out a BTA (behind the axle) or OTA (over the axle) steering setup. Not sure which it is but who cares, it works As I started mocking up different ideas I realized a few issues. I definitely wanted to eliminate the clamps that mount to the axle tube mostly for clearance reasons. The other problem was that there are not any holes on the axle to mount anything to! First bracket was made from some aluminum angle. It basically gives me a mount for one side of the servo, bolts to the gear case using the upper link mount holes and relocates the upper link mount further back out of the servos way. The relocation of the upper link mount might be a problem for some people that don’t want to make new links It also messes with the suspension geometry, however it’s the front so I was not too concerned, the steering advantages were worth it to me. Here you can see some progress on the steering tie rod. My knuckles are flipped and so are the lower link mounts. I also drilled a new hole in the knuckles and cut the old ones off. The tie rod is 3/16” SS tubing and I used some 3mm threaded links from a tlt kit that are pinched inside at the bend. They aren’t going anywhere. You can also see that the servo is raised high enough off the axle the the tie rod can move freely between the gear case and bottom of the servo.

07-24-2008, 01:22 PM	#10
maro69camaro Quarry Creeper Join Date: Feb 2008 Location: stockton Posts: 394	it will never work. j/k guys this setup works great i have seen it up close and it very nice..

07-21-2008, 05:19 PM	#2
Brandon Im Brandon Join Date: Feb 2005 Location: Colfax, CA Posts: 8,156	Now for the bracket to support the other side of the servo. Because I flipped my lower link mounts I was able to build this mount from aluminum channel. The axial 6mm spacers worked perfectly. I had to clearance the bracket in a few spots for the shocks to clear. Its nothing fancy at all. Next I brazed a tlt link mount onto the tie rod for the drag link to attach to. A few preliminary finished product pics. Only picture I have that shows the part removed from the bracket for the shock to clear. This wont be an issue if you have enough separation at the tops of your shocks. You can also see the location of the new holes I drilled in the knuckles. I will update this thread with some new pictures soon. I have made a few more slight changes and fixed the drag link angle slightly. Also notice the correct ackerman angles at full lock. I personally like the ackerman angles this setup allows. The main advantage is steering uphill while sidehilling. You can square up the tire to the climb, however the ackerman on the stock steering setup you can turn sharper since the outside tire is at a greater angle. Feel free to discuss and ask questions.

07-21-2008, 05:53 PM	#3
carver Rock Crawler Join Date: Nov 2007 Location: San Marcos Posts: 835	That is very trick. Your very creative. can you make me a kit for my axles?

07-21-2008, 07:12 PM	#4
Miller Tyme Pebble Pounder Join Date: Apr 2008 Location: Indiana Posts: 145	I like the idea. Not quite what I envisioned, But I like it. It is similar to what I've been thinking of, but I want to leave the servo bottomed out on the axle and bow the link up and over the servo.

07-24-2008, 02:57 AM	#6
Da Hermit RCC Addict Join Date: Jan 2008 Location: Wetlands Posts: 1,014	Thanks luv. for the ideas. it looks to be an advantage out on the rocks. Show us how it worked when you have time.

07-24-2008, 03:05 AM	#7
genki Quarry Creeper Join Date: Oct 2006 Location: Japan Posts: 385	Brilliant, looks awesome...great fabrication ;)

07-24-2008, 03:45 AM	#8
Mnster MWRCA'er Join Date: Apr 2004 Location: Machesney Park IL Posts: 3,995	Did you drill and tap the extra holes in you knuckle or did they come that way? Been thinking about drilling some holes to bring the link closer to the truck then doing a reversed setup of what you have. Over the axle steering in front of the axle.

07-24-2008, 01:36 PM	#11
braceysdad Adilynsdad too! Join Date: May 2004 Location: G ville Posts: 8,844	In, thanks for the chance...

07-24-2008, 04:20 PM	#12
FrankyRizzo I wanna be Dave Join Date: Apr 2005 Location: Vegas Posts: 7,172	Checked my mail..... mine is not here yet.

07-25-2008, 03:17 AM	#15
Da Hermit RCC Addict Join Date: Jan 2008 Location: Wetlands Posts: 1,014	[quote=Nluvwithxlr8ing;1273546]Thanks! What do you want to see? It worked great at the past two comps. Not having a tie rod to get caught on is great quote] My daughter keeps me from saying i have time to make my own. Do you have an extra one that I can buy off of ya?

07-25-2008, 05:55 AM	#16
Stormin2u I wanna be Dave Join Date: May 2007 Location: Taylors Falls just hanging with the MNRCRC crew. Posts: 7,843	Once again very nice mod that looks great.

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07-25-2008, 01:54 PM	#18
KenDobson Rock Stacker Join Date: Jul 2008 Location: Sonoma Posts: 70	Have you ever thought about using one servo per side, then you could have few different mixs set up similiar to what the airplane guys do. Mix in different amounts of throws and end points. You might have to use a dx6 or something but was wondering if it has been done or could be benefiacal.

08-08-2008, 09:06 AM	#19
TURBOFEST I wanna be Dave Join Date: Aug 2007 Location: JERSEY BOONDOCKS Posts: 3,360	I just saw this thread... This is just awesome...its inovation like this that makes me love RC crawling. Nice work!!

08-09-2008, 06:33 PM	#20
finishline RCC Addict Join Date: Nov 2007 Location: CALI "209" Posts: 1,970	looks great brandon hope to get some berg action soon myself

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Thread: Nluv's BTA/OTA Berg Steering setup