In search of: Lever arm with pinch bolt

[scsmith]

I'm looking for a short lever arm that would be used to actuate a butterfly valve, or carb heat, or other control. Something about 2 to 2.5" long, with a pinch bolt that clamps the arm onto a 1/4" diameter shaft. Also looking for a swiveling cable clamp bolt that would be used to fix a control cable to the end of the lever.

I've installed several of these - I think I made the last one myself, and others have come with a device (like a butterfly valve in a short piece of duct).

It doesn't seem like it should be hard to find such a thing, but I am striking out.

Ideas?

 

[scsmith]

I'm looking for a short lever arm that would be used to actuate a butterfly valve, or carb heat, or other control. Something about 2 to 2.5" long, with a pinch bolt that clamps the arm onto a 1/4" diameter shaft. Also looking for a swiveling cable clamp bolt that would be used to fix a control cable to the end of the lever.

I've installed several of these - I think I made the last one myself, and others have come with a device (like a butterfly valve in a short piece of duct).

It doesn't seem like it should be hard to find such a thing, but I am striking out.

Ideas?

Here is the solution for the second part. ACS has them in a few sizes. I didn't know what to call it I guess.

Cable End B Nut | Aircraft Spruce

Cable End B Nut This universal NAP assembly will eliminate bent or smashed push-pull cable ends and get a strong hold at the same time. The cable end lays in a machined channel at the bottom of the screw hole. ...

www.aircraftspruce.com

 

[Desert Rat]

I'm looking for a short lever arm that would be used to actuate a butterfly valve, or carb heat, or other control. Something about 2 to 2.5" long, with a pinch bolt that clamps the arm onto a 1/4" diameter shaft. Also looking for a swiveling cable clamp bolt that would be used to fix a control cable to the end of the lever.

I've installed several of these - I think I made the last one myself, and others have come with a device (like a butterfly valve in a short piece of duct).

It doesn't seem like it should be hard to find such a thing, but I am striking out.

Ideas?

Try Googling "Aluminum drive arm" or "aluminum servo arm".

 

[Scott Hersha]

I used to call those cable end nuts “bug nuts”. Guess that’s not really what they are called, but I still have a couple of them. I just ordered a butterfly valve from TCW for oil cooler air control, and it has a lever action control arm like you describe. When I get it, I’ll see if I can make one. The one pictured is from Spruce. I ordered mine directly from TCW.

TCW BUTTERFLY VALVE 3" DUCT | Aircraft Spruce

TCW BUTTERFLY VALVE 3" DUCT Butterfly Valve for oil coolers works with the TCW Control Valve Servo Kit.

www.aircraftspruce.com

 

[Scott Hersha]

Lots of good choices at. “aluminum servo arms”.

 

[scsmith]

Lots of good choices at. “aluminum servo arms”.

Not really. Almost all of those are made to fit on a splined shaft, common on R/C model servos. There seem to be 23, 24, and 25 tooth splines. Since they use a 6mm shaft, I could probably drill it out to 1/4" and just put up with the remnants of the spline. So that would probably be OK. The Uxcell one uses a set screw onto the shaft, but not a clamping action. Still looking.......

 

[RV7A Flyer]

Not exactly what you're looking for, but something akin to this? Search for "actuator arm"...

 

[Mike S]

Are you looking for something like on this unit??

Perhaps contact the folks who make it and see if they will sell the arm separate?

Airflow Systems Asocd-4-Bv Butterfly Valve | Aircraft Spruce

Airflow Systems Asocd-4-Bv Butterfly Valve Airflow System 4 inch butterfly valve for modulating airflow to oil coolers installed on 45 degree duct.

www.aircraftspruce.com

 

[RV7A Flyer]

BTW, seems like something you could manufacture yourself...machine a piece of Al, drill and tap the end and then slot it, etc.

 

[scsmith]

BTW, seems like something you could manufacture yourself...machine a piece of Al, drill and tap the end and then slot it, etc.

Yes I have made a couple myself. I just don't want to do mass production of a component for the new ram air intake system if I can just source it.

 

[scsmith]

I'm going to try the servo arm as suggested by Scott. The longest one I can find at a reasonable price is 2", I think that will be OK. I think I can drill out the shaft spline to fit a 1/4" shaft, and I think I can drill out the threaded anchor hole to 3/16 to take the "B" nut.

 

[gereed75]

Go search Weber carburetor linkage or similar. Carb linkage kits use a variety of lever arm and bug nuts.

 

[N49ex]

Try this place:

lever arm - standard

Simple and effective linkage. Includes shaft lock grub screw and pin hole for throttle stop spring return spring. Shaft Center To M5 Threaded Lever Holes: 37mm. (M5 threaded hole also suits 10/32UNF) Overall Length: 50.3mm Overall Width: 8.3mm Suits 8mm & 5/16" shaft diameter. Available...

www.efihardware.com

Lever Arms

EFI Hardware is a Melbourne based automotive parts supplier company. EFI Hardware specialises in linkages, manifolds, ram tubes, fuel rail fabrication, hall effect switches, multi point manifold conversions, custom, speed flow fittings and other automotive parts.

www.efihardware.com

 

[scsmith]

Try this place:

lever arm - standard

Simple and effective linkage. Includes shaft lock grub screw and pin hole for throttle stop spring return spring. Shaft Center To M5 Threaded Lever Holes: 37mm. (M5 threaded hole also suits 10/32UNF) Overall Length: 50.3mm Overall Width: 8.3mm Suits 8mm & 5/16" shaft diameter. Available...

www.efihardware.com

Lever Arms

EFI Hardware is a Melbourne based automotive parts supplier company. EFI Hardware specialises in linkages, manifolds, ram tubes, fuel rail fabrication, hall effect switches, multi point manifold conversions, custom, speed flow fittings and other automotive parts.

www.efihardware.com

Unfortunately the shaft size is too big (8mm or 5/16") I need 1/4"

I'm going to try the servo arm as suggested by Scott. The longest one I can find at a reasonable price is 2", I think that will be OK. I think I can drill out the shaft spline to fit a 1/4" shaft, and I think I can drill out the threaded anchor hole to 3/16 to take the "B" nut.

Just as a follow up, I ordered a couple of these servo arms. They are WAY too light weight and petite for what we need.
Sigh.
I guess I'll have my waterjet guy cut me out a bunch of blanks and I'll machine them myself.

 

[Webb]

This might fit your criteria. Found lots of examples by seariching for clamp servo arm.