Oooooh...Aaaaah! Those are purdy! It's like picking between some hot chick or her evil twin. This is going to be a tough decision.

 

FYI,

It works nicely with a slave from a 1986 Jeep Cherokee

and this...

Download DWG file here. I designed it to have a little adjustment in it, just in case Murphy pays a visit.

This was my end game...

 

Test fit...

 

If you used 6061 or better for the aluminum, you're not bending either one of them. The threaded rod will fail first.

Those are nice.

 

Back of envelope Calculation




Hey Glen,

Being an old Mech Engr without FEA, I can do a quick back of the envelope calc. Lets see:

Push with 100# foot force for monster clutch.
5:1 mech advantage from pedal assy = 500 pounds at MC 7/8 dia.
Slave 7/8 dia so force on bracket and clutch fork = 500 pounds.

Bending Stress on bracket = M*c/I = 1500 psi for 1/2" aluminum or steel or anything.

Deflection at Cylinder =pl^3/3EI so:
- Deflection at the Slave mounting point less then .006" for 1/2" thick Aluminum any alloy since E (Youngs Modulus) is approximately 11.5*10^6 psi for all. E for steel is 30*10^6psi so deflection is 1/3 or .002".

6061 T6 has a typical Yield Strength of 35,000 psi, conservatively take 30% of that for infinite life in cyclic loading = 11,000 psi cyclic load limit
** The 1/2 Alumumin has a factor of safety then of 11,000/1500 or 7X...Should be bullet proof.

1/4" 6061 T6 plate would raise the stress to 12,000 psi and deflection would be .048".
** Cutting it kind of close.

Nice Work Don, system looks great.

Dave

 

Hey Glen,

Being an old Mech Engr without FEA, I can do a quick back of the envelope calc. Lets see:

Push with 100# foot force for monster clutch.
5:1 mech advantage from pedal assy = 500 pounds at MC 7/8 dia.
Slave 7/8 dia so force on bracket and clutch fork = 500 pounds.

Bending Stress on bracket = M*c/I = 1500 psi for 1/2" aluminum or steel or anything.

Deflection at Cylinder =pl^3/3EI so:
- Deflection at the Slave mounting point less then .006" for 1/2" thick Aluminum any alloy since E (Youngs Modulus) is approximately 11.5*10^6 psi for all. E for steel is 30*10^6psi so deflection is 1/3 or .002".

6061 T6 has a typical Yield Strength of 35,000 psi, conservatively take 30% of that for infinite life in cyclic loading = 11,000 psi cyclic load limit
** The 1/2 Alumumin has a factor of safety then of 11,000/1500 or 7X...Should be bullet proof.

1/4" 6061 T6 plate would raise the stress to 12,000 psi and deflection would be .048".
** Cutting it kind of close.

Nice Work Don, system looks great.

Dave

Don't make me think! Uhh. Pl being Load and EI being deflection. We are way safe with the (E) value of 6061 T6 at .375 and crazy safe at .500. OK. Thanks mang!

 

Dude, I had a hard time following that! (at least the last part) I just went with the idea of making it at least as strong as the other brackets I have seen.

 

try using a hine joint Don on the clutch fork so it can pivot.
and 1/2" al. would be perfect for the plate
anodized even better i have some and it it almost hard to drill at first

SJDave you formatted the one that Forte uses right?

 

I am thinking of doing that. I have some 1" square steel tubing I was thinking of carving up into a "U" bracket sort of like Forte's design with a rod end on the push rod. The push rod I have displayed has a pivot ball on it to minimize friction, but I agree the rod end would be better.

 

The ball works perfectly well, I don't think there is a need to over engineer this It is smooth as butter in mine.

 

Darren, do you just have a jam nut behind the ball and a lock nut on the back side of the fork?

 

thanks SJDave

i think it works
but i also moved the bracket with the cnc slave back about 3/4 to 7/8 "
i have lots of pics of what i did in my profile, along with ralph he modified my Mod, with a welded one.

 

Hi Guys,
It looks as though a budget bracket & slave bracket is of interest here. I think I'll make a budget kit fot the TKO & T-5. Laser cut steel or stainless steel will save money for sure over CNC machined aluminum.
TDon & Glenn, thanks for proving the interest.
Mike

 

That would be cool if you guys could offer a budget kit. It would be nice to have a couple of options for the Push style.

 

Yea ME TOO!