Doug: Reaching back in time and memory, there used to be "adaptors" that were either supplied with the fixture, or available at the lighting store. Now, I don't mean the "big box", the neighborhood store that sold fixtures a,d electrical materials. The guys that worked there could give you an adaptor, hickey, gland, or whatever you needed. Have a gas pipe old fixture, they had a cap/hickey combo to fit.
Granted, you needed a deep canopy to cover some of the combonations, but they had that too.
Today, with the demise of the specialty stores, and the growth of the big boxes, it's tough to find parts, or someone who understands what you are trying to do.
Guess it's time to replace the pancake??
Re: "New" fixtures on Old Work#31383 11/20/0310:19 PM11/20/0310:19 PM
I guess its pretty rough, if you don't have the 8/32 screw holes accessible, and just have a hickey to work with. I carry a life time supply of old hickeys and saved the old stuff, over the years. To change the box, would be reconmended if you were hanging a fan. Most of the time that OLD BOX is right under some good wood, and then you might be able to get a pancake box in there. Good luck
Re: "New" fixtures on Old Work#31385 11/21/0307:06 PM11/21/0307:06 PM
The biggest problem I have is that a)the small holes in the box aren't threaded (I've got a Klien tapper, so it's possible, just time consuming), and b)most of the boxes are rivet mounted on steel straps mounted between joists - so I'd have to punch / grind out the rivets and then find a way to mount the new box.
Oh well... I guess this is the "artistic" part of our job, huh?
Re: "New" fixtures on Old Work#31387 11/23/0301:17 PM11/23/0301:17 PM
Though about something like that - even a slightly lighter weight version- but many of the pans have the strap across the top, and I'd have to whomp a chunk out of the ceiling to extract the old brace.
I'm able to use spacers and adapters to mount offset brackets, but I was wondering if anyone knew of a cleaner way...
Re: "New" fixtures on Old Work#31389 11/23/0311:19 PM11/23/0311:19 PM
Compared to the alternatives, using the Triple-Tap would take the least time, hands down. I deal with this from time to time, and I think the time it takes to go out to the truck, pull out the fixture parts Kennedy case, root through all the possibles until I have the actuals and get back in. . .well, I'd have the holes tapped.
But here's another thought. What about drilling and tapping the back of the j-box? Just a thought, and a serious question. Given that the ears on the modern box are the same metal and thickness as the box itself, what about using a long enough 8-32 machine screw to secure the luminaire strap to the bottom (top?) of the ceiling j-box? I am assuming that there are two open spaces for the screw shafts along the box side wall, 180º apart from each other, and that the volume/conductor count passes muster.
Re: "New" fixtures on Old Work#31390 11/23/0311:39 PM11/23/0311:39 PM
Of course I can't see what you've got, but I've had good luck cutting the straps in the middle and bending the two halves out of the way. If the straps were nailed to the bottom of the joists they won't be in the way of installing a Fan bracket like this one because the legs will go over the old strap.