The Ford Barn

Leatherback 57 · 10-09-2019, 02:33 PM

Does anyone have a formula for castor measurements . Les Andrews book says at 11in difference of 1in is . 09 or 5.1deg.
Mine is at 12in and a difference if 1.5 in or 0.125
I'm thinking around 7degrees??

Roger Green · 10-09-2019, 02:55 PM

Yes, the arc tangent of 1.5/12 is 7.13 degrees.

Leatherback 57 · 10-09-2019, 04:55 PM

Great, Thanks. Should be good.

Chuck Sea/Tac · 10-09-2019, 05:48 PM

Just by a angled scaled magnetic protractor from your local lumberyard and stick it to the axle and read the °’s

Patrick L. · 10-10-2019, 03:25 PM

7º of caster is quite a bit. They are originally set for 5º which is still quite a bit.
The car will still probably track well at speed, but, the steering wheel probably will not want to return very well on its own during a slow turn.

Railcarmover · 10-10-2019, 10:13 PM

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Quote:

Originally Posted by Patrick L.

7º of caster is quite a bit. They are originally set for 5º which is still quite a bit.
The car will still probably track well at speed, but, the steering wheel probably will not want to return very well on its own during a slow turn.

its an old hotrodder trick,the more caster or king pin inclination the less steering effort you have,add enough it will feel like power steering,till it dives into a turn..

Pete · 10-10-2019, 10:33 PM

Quote:

Originally Posted by Railcarmover

its an old hotrodder trick,the more caster or king pin inclination the less steering effort you have,add enough it will feel like power steering,till it dives into a turn..

You may want to rethink that.

SAJ · 10-11-2019, 12:41 AM

Hmm. The action of caster lifts the sprung weight up as the wheels turn if I am not mistaken. I often am!!
This should give heavier steering and more self-centreing action,
SAJ in NZ

updraught · 10-11-2019, 01:15 AM

It's like a shopping trolley ...
https://www.youtube.com/watch?v=Gh7gWJAvOvs

duke36 · 10-12-2019, 04:10 PM

5 deg.measured per post 4 at the axle ends next to the king pins. The axle in the middle may be different due to age, etc.

10-09-2019, 02:33 PM	#1
Leatherback 57 Member Join Date: May 2016 Location: Gilroy California Posts: 42	Castor angle Does anyone have a formula for castor measurements . Les Andrews book says at 11in difference of 1in is . 09 or 5.1deg. Mine is at 12in and a difference if 1.5 in or 0.125 I'm thinking around 7degrees??

10-09-2019, 02:55 PM	#2
Roger Green Member Join Date: Apr 2016 Posts: 36	Re: Castor angle Yes, the arc tangent of 1.5/12 is 7.13 degrees.

10-09-2019, 04:55 PM	#3
Leatherback 57 Member Join Date: May 2016 Location: Gilroy California Posts: 42	Re: Castor angle Great, Thanks. Should be good.

10-09-2019, 05:48 PM	#4
Chuck Sea/Tac Senior Member Join Date: May 2010 Location: Between Seattle & Tacoma Posts: 2,436	Re: Castor angle Just by a angled scaled magnetic protractor from your local lumberyard and stick it to the axle and read the °’s

10-10-2019, 03:25 PM	#5
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: Castor angle 7º of caster is quite a bit. They are originally set for 5º which is still quite a bit. The car will still probably track well at speed, but, the steering wheel probably will not want to return very well on its own during a slow turn.

10-11-2019, 12:41 AM	#8
SAJ Senior Member Join Date: Jul 2010 Location: Auckland, New Zealand Posts: 532	Re: Castor angle Hmm. The action of caster lifts the sprung weight up as the wheels turn if I am not mistaken. I often am!! This should give heavier steering and more self-centreing action, SAJ in NZ

10-11-2019, 01:15 AM	#9
updraught Senior Member Join Date: Feb 2015 Location: Australia Posts: 2,288	Re: Castor angle It's like a shopping trolley ... https://www.youtube.com/watch?v=Gh7gWJAvOvs

10-12-2019, 04:10 PM	#10
duke36 Senior Member Join Date: Jun 2015 Posts: 1,456	Re: Castor angle 5 deg.measured per post 4 at the axle ends next to the king pins. The axle in the middle may be different due to age, etc.