08-21-2017, 08:36 PM
(08-21-2017, 06:05 PM)Herb G Wrote: You obviously don't know the difference between a key hole saw & a hole saw.
I keep striving to know everything like you apparently do.
Jim
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What size Key Hole saw
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 I keep striving to know everything like you apparently do.
08-21-2017, 08:39 PM
(08-21-2017, 06:08 PM)museumguy Wrote: How many holes are you cutting? Are they overhead or on a pair of sawhorses? The reason that I ask is because there a few options on how to do this, depends on where the cut is, in the air or on the ground. I'll be making 4 ceiling medallions, which will be holding the connection box. So I'll be cutting the holes on the bench or drill press
Jim
08-21-2017, 09:41 PM
I would use a hole saw, what type of box?
A steel octogon box takes a 4" hole. Plastic might be different. Ed 
08-22-2017, 03:58 AM
08-22-2017, 09:16 AM
(08-22-2017, 03:58 AM)Herb G Wrote: You'll get there one day my friend. Great my friend. I withdraw my sarcasm.  Still haven't got an answer to my question
Jim
08-22-2017, 09:43 AM
(08-21-2017, 08:39 PM)Halfathumb Wrote: I'll be making 4 ceiling medallions, which will be holding the connection box. So I'll be cutting the holes on the bench or drill press Make the medallions over sized so they act like a trim piece. I'd expect the hole saw to rip up the veneer on the plywood. Put the junction box on the ply, trace around the outside and cut it with a jig saw.
Mark
I'm no expert, unlike everybody else here - Busdrver Nah...I like you, young feller...You remind me of my son... Timberwolf 03/27/12 Here's a fact: Benghazi is a Pub Legend... CharlieD 04/19/15 
08-22-2017, 10:35 AM
Assume you are talking about a old work box with the lip around it. 4 1/8" should be correct. Take a compass and draw a 4 1/8" dia circle and cut it out, see if it fits. roly
08-22-2017, 11:03 AM
all the 4" round old work junction boxes I have seen will barely work with a 4" hole. There must be a larger box which I haven't seen. I would say that 3 3/4" would be perfect, but I haven't tried it. For drywall, I got a 3 1/2, going to have to do a little modification of the holes to get the box through that hole though. Haven't tried that yet either.
I'm talking about this box: http://www.homedepot.com/p/Carlon-1-Gang.../100404072 (08-22-2017, 11:03 AM)EricU Wrote: all the 4" round old work junction boxes I have seen will barely work with a 4" hole. There must be a larger box which I haven't seen. I would say that 3 3/4" would be perfect, but I haven't tried it. For drywall, I got a 3 1/2, going to have to do a little modification of the holes to get the box through that hole though. Haven't tried that yet either. The installation instructions for that box has a pdf template. It shows exactly a 4" dia hole but with 3 half inch holes drilled around the outside edge to provide clearance for the clamps. 4" is the exact size so it could be tight. Best to try on a sample piece to see how close the template is. Roly |
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in my first response.
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