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Steering clutch/brake inspection.

UserPost

December 18, 2011


Bob Rooks

Member

posts 1370

Thought I would start this thread so I don't take up space on Greg's, and to eliminate any confusion. I should be starting on this project in January during my vacation but there is going to be a change in my work schedule so I still have to see how that will shake out.

Anyway, the shop is coming along. Still have another gantry to set up in the other bay and clean up the mess, and a few more doo-dads to add. wink

 

December 18, 2011


RichWaugh

Lifetime Member Platinum Elite

posts 517

Man Bob, that floor is shiny!  Looks like any oil you spilled wold bead up like water on that.  hailking

December 18, 2011


Bob Rooks

Member

posts 1370

The floor has two coats of this stuff (you won't find it in hardware stores). It's like clear steel and actually strengthens the cement. Makes it real easy to keep clean too.

 

December 19, 2011


Tinbender

Lifetime Member Platinum Elite

posts 577

Hope you had the doors open when you put it downlaugh

December 19, 2011


Bob Rooks

Member

posts 1370

"Hope you had the doors open when you put it downlaugh"

Yes! That stuff is NASTY! VOC of 700! I'll bet it cleared the forest of wild animals for a half mile. wink

 

The new workbench arrived yesterday. Problem is, I have to build it. embarassed

December 19, 2011


RichWaugh

Lifetime Member Platinum Elite

posts 517

Oh yeah – some assembly required…roflmao

December 20, 2011


Bob Rooks

Member

posts 1370

Post edited 12:31 pm – December 20, 2011 by Bob Rooks


Some?? roflmaoroflmao More like build from scratch. roflmaoroflmao

February 21, 2012


Bob Rooks

Member

posts 1370

Update on my steering brake mod. It works great and I'm very pleased with it's functioning. There is a better feel for when the clutch releases and the brake is applied. There is also less pedal movement required.

I tried to take some pics and a video but the space where all the action takes place makes it almost impossible.

February 26, 2012


Bob Rooks

Member

posts 1370

Post edited 3:20 am – February 26, 2012 by Bob Rooks


Here is the pic of the mod. The geometry configuration of the cable allows for twice the take up rate of the brake actuating arm over the straight rod linkage, compensating for the slack in the actuating links at the brake band anchor points (and it feels like power brakes too).

February 26, 2012


CTOA

Admin

posts 185

I assume before it was just a straight connection between the break and the foot petal?

February 26, 2012


Bob Rooks

Member

posts 1370

Post edited 9:27 am – February 26, 2012 by Bob Rooks


Correct.

"The geometry configuration of the cable allows for twice the take up rate of the brake actuating arm over the straight rod linkage…"

Nothing was broken.

February 26, 2012


RichWaugh

Lifetime Member Platinum Elite

posts 517

That's a really excellent mod, Bob!  Elegantly simple solution to the problem and only adds one moving part to the assembly.  Hard to beat that when you net a 2X take-up rate on the brake bands.  That looks like one the factory should incorporate, though it is simple enough that it can be done by anyone with a few hand tools and a bit of time.  Well, and a crawlie that need it…makes me wish you owned a wheelie so you could come up with similar great ideas for it that I could actually use myself.  roflmao

February 26, 2012


pepage

Lifetime Member Expert

posts 128

You all are going to have to talk real slow now. I had trouble wrapping my brain around the 2x take up rate but now I see it.

http://www.the-office.com/summ…..basics.htm

What you have is a movable pulley system as I see it. Your foot pressure would be the weight and the force on the brake lever P. Does this mean one would have to push twice a hard on the pedal with this pulley system versus a straight lever system?

More to follow when we can talk faster.

February 26, 2012


Tinbender

Lifetime Member Platinum Elite

posts 577

You should have to push half as hard, with the wire rope sheave acting as a snap block.readin hmmm

February 26, 2012


Tinbender

Lifetime Member Platinum Elite

posts 577

BTW, excellent work Bobcool

February 26, 2012


Bob Rooks

Member

posts 1370

Thanks guys.

Pete,

There are more forces involved than a simple class 2 pulley system. The movable pulley anchor point is about 3" up from the pivot (fulcrum for the second class 1 lever system) point. The distance from the pulley anchor point is over a foot. There is a tremendous mechanical advantage there that overcomes any losses in the pulley system. In essence, the pulley system efficiency is compounded.

Hope that explanation works. laugh

February 26, 2012


pepage

Lifetime Member Expert

posts 128

Post edited 2:36 pm – February 26, 2012 by pepage


That helps… now off to school I go.

 

Edit:

Ouch, makes my brain hurt. When I retired, I think my brain also retired. Looks like I will have to make a model and do it empirically. Like, what would happen if the pulley was on the break arm instead of the pedal?

Some additional questions Bob:

How do you plan to adjust for brake wear?

How did you make sure the steering clutch was open before brake was applied?

Unrelated to mod….How did you adjust your steering clutch?

Bob, I think you can start wearing your cape.

Phil

February 26, 2012


Bob Rooks

Member

posts 1370

Some additional questions Bob:

How do you plan to adjust for brake wear?

There is no real adjustment for that per se, but the pedal travel is adjusted by taking up on the eye bolt.

How did you make sure the steering clutch was open before brake was applied?

Actually, I didn't touch the clutch adjustment, it was still within spec. It still fully releases after about 1-1/2" to 2" of pedal travel, at which time all of the slack is out of the brake band and it is being applied from that point on at 2x the normal rate, so you actually have less pedal travel to achieve full braking capacity.

Unrelated to mod….How did you adjust your steering clutch?

By the book. laugh

Bob, I think you can start wearing your cape.

roflmaoroflmao At no point did I say we have reached the promised land, and I have no idea why I insist on calling you Pete. roflmaoroflmao

February 27, 2012


Bob Rooks

Member

posts 1370

Phil wrote:

Like, what would happen if the pulley was on the break arm instead of the pedal?

Then the take up rate would be about one-half that of the OEM rod linkage, giving no advantage in this case. It's explained pretty well in your link.

February 27, 2012


pepage

Lifetime Member Expert

posts 128

Bob,

You are correct AGAIN! With the pulley on the pedal, the short wire gets longer as the pedal is depressed. With the pulley on the brake arm, the short wire gets shorter when the pedal is depressed.

When I post, I sometimes toss something in at the end that is thoughtless.

Phil


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