PDA

View Full Version : ackerman angle jig



MrIdaho
05-28-2013, 03:10 PM
Here is a really simple method to get the ackerman steering tabs dead on accurate.
A block of wood with desired angle (pictured is 5 degrees) then drill hole for heim joint mounting in desired location on the metal tab.
Place on wood block with a straight edge across the forks (sawall blade in picture) then make hole location on wood.
Drill block out, bolt tab, place on straight edge then weld tab.
The pictue has the angle on the left side and the right side of block is 90 degrees to fork.
Turn block around to do opposing fork steering tab. Both tabs come out identical lenght and angle. No real guessing.http://i992.photobucket.com/albums/af44/MrDEB/bikejig_zps455b064b.jpg (http://s992.photobucket.com/user/MrDEB/media/bikejig_zps455b064b.jpg.html)

edspedalcars
05-29-2013, 12:38 PM
Hi there MrIdaho

I have a fairly good understanding of the ackerman setup.

I applied it to my T bucket pedal car, and it steers pretty easy,
so I'm guessing I got it close to correct.

http://s10.postimg.org/nfxgbdemx/dcp_1132.jpg

On my Inferno build, I am designing the use of a 'virtual head tube'.

http://s11.postimg.org/8npm92h2r/003.jpg

The steering design I will be using, will require, tabs, as you are showing in your
picture.

My question. I understand the 90 degree angle, but not the 5 degree part.

Would you explain that part, please?

Thanks, Ed

MrIdaho
05-29-2013, 05:26 PM
the degree angle, in this case is 5 degrees. Ackerman steering angles, as I understand allows the inside wheel (say turning left, the left wheel is inside)to turn sharper than the opposing wheel. There are numerous articals about ackerman steering

Ticktock
05-29-2013, 07:48 PM
Hi Ed,
The block of wood is a case of the camera telling lies!
The confusion (me too for a while) is in the distorted shape of the block---cunning camera trick.
The steering tab, which can just be seen behind the wood, is bolted flush with the 5 degree angled face of the block-. This face looks like the 90 degree angle in the pic! the other side (RH side in the pic ) is in fact, the 90 degree side. So long as the center of the base of the tab is on the fork center line, the angle comes out dead right when you reverse the set up on the other side.
Much easier to measure 5 degrees on a big bit of wood than it is to guess on a set of forks.
Note that this advice is given for something like a Tricriuser, using two complete front forks, with the steering arms facing forward or backwards from the forks. It has no use on the front of a Delta trike! Only for a vehicle with two front wheels needing an Ackerman set up.
Neat and simple -the way jigs should be.
Hope that removes more confusion than it causes!
Steve G,
Beijing,

PS-Now its me confused! Why will you need steering arms on the Inferno? I thought the steering was direct handle bars to fork head!

edspedalcars
05-29-2013, 08:12 PM
Hi Steve

Usually ... it doesn't take a 1000 words to explain a picture, !!!

But it sure helped this time, thanks.

It is a simple method for insuring correct mounting and worth retaining.

About the Inferno steering, see me on the Inferno thread, OK?

Thanks, Ed

Ticktock
05-29-2013, 08:16 PM
OK, Will check the Inferno thread over morning coffee!
Steve G.
PS This time--only 238 words !

MrIdaho
06-02-2013, 08:44 PM
Sorry I confused people. Now that I read Ticktocks explanation I see where the confusion is