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-   -   Cutting holes in plastic J-Box (http://www.diychatroom.com/f18/cutting-holes-plastic-j-box-39065/)

jamiedolan 02-24-2009 01:28 PM

Cutting holes in plastic J-Box
 
2 Attachment(s)
I got some of those large plastic J-boxes. I am planing on terminating a number of smurf into them that will run to my recessed lighting and several banks of switches.

The boxes come with no holes in them. I am wondering what is the best way to put the holes in them, and what size I need for 1/2". I have these greenlee cutters, but have not used them before, will they work? Do I just drill a pilot hole, then run this cutter in?

Thanks
Jamie
Attachment 8506

Attachment 8507

Bocolo 02-24-2009 02:12 PM

Jamie, you have a lot more experience than I do but I personally have never used those cutters on plastic. I have used them on metal boxes and they work great. Why not just drill the plastic box with a spade bit? You should be able to go through them pretty quick.

handyman78 02-24-2009 02:25 PM

For the price of a plastic box you can try and sacrifice a cheap one as a test using the punches. I have those too but haven't used on plastic. Otherwise, you can use a hole saw or sharp spade bit run slowly thru the box.
And yes, you drill the smaller hole for the size of the bolt, then feed thru as they are shown and snug them up with a wrench, cutting the sidewalls as you go.

jbfan 02-24-2009 03:23 PM

Use a unibit or a hole saw.

InPhase277 02-24-2009 03:44 PM

Jamie, I don't see why the cutters wouldn't work, but you could just use a hole saw or spade bit. 1/2" is really 7/8", and 3/4" is really 1-1/8".

jamiedolan 02-24-2009 03:45 PM

Quote:

Originally Posted by Bocolo (Post 236018)
Jamie, you have a lot more experience than I do but I personally have never used those cutters on plastic. I have used them on metal boxes and they work great. Why not just drill the plastic box with a spade bit? You should be able to go through them pretty quick.

HI;
I actually have not used these cutters before, my dad just gave them to me a couple weeks ago. I don't have a great drill bit collection, many of them are rather dull. I keep a good selection of the speed bor style bits for drilling holes in joists, but I think they would trash a plastic box.

Thanks
Jamie

jamiedolan 02-24-2009 03:52 PM

Quote:

Originally Posted by InPhase277 (Post 236071)
Jamie, I don't see why the cutters wouldn't work, but you could just use a hole saw or spade bit. 1/2" is really 7/8", and 3/4" is really 1-1/8".

Excellent, thanks for the confirmation on the exact sizes. A hole saw sounds like it would be pretty easy. I am going to have to drill alot of hole in the box, I was thinking I might get 15 or so 1/2" smurf into one of these big boxes.

I mounted like 8 4x4's and put 3 smurf into each one of them, running down to the kitchen for switches, and feeds to recessed lights. I decided it was just going to be a mess to try and connect the the 4x4's to each other and decided to yank them and go with a larger box, should be a much cleaner solution.

I think I will run a 3/4"emt from the sub down to these plastic junction boxes (2 of them) and a 3/4" chase or two between them. I think it will be a much cleaner more professional installation.

Thanks again guys.
Jamie

jamiedolan 02-24-2009 03:54 PM

Quote:

Originally Posted by handyman78 (Post 236027)
For the price of a plastic box you can try and sacrifice a cheap one as a test using the punches. I have those too but haven't used on plastic. Otherwise, you can use a hole saw or sharp spade bit run slowly thru the box.
And yes, you drill the smaller hole for the size of the bolt, then feed thru as they are shown and snug them up with a wrench, cutting the sidewalls as you go.

Ahh yes, I have many plastic boxes around I'd be happy to kill. I really like using metal boxes, but I figured it would be easier to get all these holes in the plastic box and since I was connecting smurf to it anyway...

Thanks
Jamie

220/221 02-24-2009 04:52 PM

The punches will work...but why bother?


You need to drill a hole so you might as well drill the proper sized hole.


I only punch metal 2" and up because the larger size hole saws have too much surface area to cover and it takes freaking forever.

Best hole saw set ever. These things are the best electrical tool to come along in a long time.


http://www.all-spec.com/images/660.gif

jamiedolan 02-24-2009 05:16 PM

Quote:

Originally Posted by 220/221 (Post 236113)
The punches will work...but why bother?


You need to drill a hole so you might as well drill the proper sized hole.


I only punch metal 2" and up because the larger size hole saws have too much surface area to cover and it takes freaking forever.

Best hole saw set ever. These things are the best electrical tool to come along in a long time.


http://www.all-spec.com/images/660.gif

What brand are those?

Thanks
Jamie

220/221 02-24-2009 06:04 PM

Greenlee 660 kwik change.

They aint cheap ($240) but they are durable. Over the past decade I have only had to buy two or three replacements for the well used 1/2 and 3/4 sizes. I have sets on all of my trucks and they get used a LOT.

One arbor and the different saws half twist on/off.

Gary_602z 02-24-2009 09:25 PM

Does Jamie do all this wiring because he has too, or is it because he just likes too? I am thinking the latter!:laughing::laughing:

Gary

jamiedolan 02-25-2009 04:27 PM

1 Attachment(s)
Quote:

Originally Posted by 220/221 (Post 236140)
Greenlee 660 kwik change.

They aint cheap ($240) but they are durable. Over the past decade I have only had to buy two or three replacements for the well used 1/2 and 3/4 sizes. I have sets on all of my trucks and they get used a LOT.

One arbor and the different saws half twist on/off.

Thinking about this one for $88, what do you think??

Attachment 8544

http://www.homedepot.com/webapp/wcs/...ctId=100175188

Thanks
Jamie

HouseHelper 02-25-2009 05:35 PM

Get a couple of Unibits... 1/2 and 3/4... you'll wonder how you ever did without.

InPhase277 02-25-2009 06:55 PM

Quote:

Originally Posted by jamiedolan (Post 236674)
Thinking about this one for $88, what do you think??


http://www.homedepot.com/webapp/wcs/...ctId=100175188

Thanks
Jamie

Not worth the box they are in, in my opinion. The set 220 posted is good, as are the greenlee KO sets, but the general hole saws are worthless. If you want a good hole saw, go with Lennox.


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