Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: jukelemon on July 15, 2013, 09:22:53 am

Title: Glue with conductor properties
Post by: jukelemon on July 15, 2013, 09:22:53 am

Is there such a thing?

For example, if I wanted to glue down a terminal strip on a chassis and not drill/use bolts, could you use something like this?

I am imagining Liquid Nail type strength with conductor qualities.

Thanks

Title: Re: Glue with conductor properties
Post by: PRR on July 15, 2013, 11:39:56 am

There is a stuff for repairing car rear-window heat strips which is a conductive paint.

There's two problems here.

Mechanical: will it rip-off on a bad road? To get a for-sure glue bond you need much more area than the typical lug-strip feet.

Electric: will it conduct <0.1 ohms, now and after a bad ride?

I'd discount the electric goal. You can (perhaps should) wire all grounds to each other. The chassis normally must be grounded, but this can be a wire to a star-washer on bolt or jack.

I assume you want to avoid bolt-heads on the outside of the chassis. There's many ways. Eastwood car-tools sells a stud welder. A piece of 1/2" GOOD (many-ply hardwood) plywood can be Shoo-Gooed to the chassis then drilled and tapped.

Title: Re: Glue with conductor properties
Post by: sluckey on July 15, 2013, 12:06:03 pm

Properly done solder works very well on a steel chassis. Useless on aluminum though.

Title: Re: Glue with conductor properties
Post by: jukelemon on July 15, 2013, 12:29:05 pm

Thanks all.

I am on Al and it is a foot pedal so ply. is not an option.

Title: Re: Glue with conductor properties
Post by: stratele52 on July 15, 2013, 02:59:48 pm

Glue is not a safety way to hold electrical device like terminal strip . Never do that

Title: Re: Glue with conductor properties
Post by: terminalgs on July 16, 2013, 03:49:02 pm

Quote from: jukelemon on July 15, 2013, 12:29:05 pm

I am on Al and it is a foot pedal so ply. is not an option.

sheet metal sub-assembly with through holes, locking fasteners for tag strips and other components with  potentiometer posts, switch masks, and input out jacks sticking up freely.   your outer alum. shell cover fits over the top and the controls come through like arms, head, and neck into a freshly pressed oxford shirt..   

Title: Re: Glue with conductor properties
Post by: mrr3000gt on July 16, 2013, 07:23:49 pm

I have a chem background and unless the glue has something in it for conducting electricity, I would think the answer is no. I would also think that a desired property of an adhesive is to not participate in any ionic transfer: such is the case with two dissimilar metals (which results in corrosion). So perhaps a glue made purposely conductive would also be a great corroder.

Even with silicon sealant - great glue for caps and pcb despite the popular belief the hardening process produces caustic chemicals that are particularly damaging - has HIGH resistance: when dry it's on the order of 3 to the 15th power ohms per centimeter.