Skip to main content ↑ ↓
Topic: Drilling a hole to a larger size (Read 890 times) previous topic - next topic

Drilling a hole to a larger size

I've had to do this before and usually try to attach a piece of plywood so the pilot drill can get a bite for the hole saw to start.
This looks like a good solution, use a hole saw the same size as the existing hole as a guide with the larger hole saw mounted above it:
Forest & Cindy Olivier
1987 log cabin
2011 Roadtrek C210P
no longer 1999 36' U320 build #5522
2013 Rzr 570 & 2018 Ranger XP1000
2006 Lexus GX470
2011 Tahoe LT 4x4
Previous 1998 45' 2 slide Newell, 1993 39' Newell

Re: Drilling a hole to a larger size

Reply #1 –
Your solution will now have my granddaughter allowing her three boys be in the shed when I am opening up a  hole. Thank you for me and them! :))  ^.^d
Nitehawk,  Demolition Lady, & our NEW master, Zippy the speeding BB cat.
1989 Grand Villa 36' ORED
Oshkosh chassis, 8.2 DD V8
2006 Saturn Vue AWD

Re: Drilling a hole to a larger size

Reply #2 –
Thanks for sharing.  This will come in handy.

Jason
Jason
1999 U320 36'

Re: Drilling a hole to a larger size

Reply #3 –
What a great tip! Thanks.
jor
93 225
95 300
97 270
99 320

Re: Drilling a hole to a larger size

Reply #4 –
That works if you have a hole saw that fits the original hole and you want the hole in the same place.  Good idea.

Sometimes you don't have the right hole saw or you need to move the hole to a new center just offset or a bigger hole not centered where the old hole was.  Use the hole saw of the size you want and drill through a piece of 3/8 or 1/2 inch plywood.  Position the plywood where you want the hole to be and use it to guide the hole saw.

This also works well when you do not want to use the pilot bit (like drilling a hole in the coach ceiling) to prevent it from going through the other side (the roof).  I did this when putting up our bedroom ceiling fan.
Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN

Re: Drilling a hole to a larger size

Reply #5 –
Quote from: Roger & Susan in Home2 –
That works if you have a hole saw that fits the original hole and you want the hole in the same place.  Good idea.

Sometimes you don't have the right hole saw or you need to move the hole to a new center just offset or a bigger hole not centered where the old hole was.  Use the hole saw of the size you want and drill through a piece of 3/8 or 1/2 inch plywood.  Position the plywood where you want the hole to be and use it to guide the hole saw.

This also works well when you do not want to use the pilot bit (like drilling a hole in the coach ceiling) to prevent it from going through the other side (the roof).  I did this when putting up our bedroom ceiling fan.

Roger when you put up the ceiling fan did you screw the mounting bracket into metal?  if so how did you locate the metal?
I am wanting to mount a TV bracket to the ceiling but I'm not sure where to mount it.
Thanks
Chris lang
1999 U 320 DGFE
Build Number 5523
Chris & Elka Lang
In the field, Lonoke AR

Re: Drilling a hole to a larger size

Reply #6 –

Chris,  in the bedroonm ceiling in my coach there is a 12"x24" plywood panel (2-3/8" layers) right in the middle of the bedroom ceiling.  There is also a PEX tube embedded in the foam above the plywood the goes over to the ceiling of the BR TV cabinet. 

You drill through the ceiling material, the fiberglass layer and a thin plywood layer, the 3/4" plywood and another 1/2" or so into the foam and the PEX tube.  The fan mount attaches to the plywood.    This panel is not in the 1997 coaches.  I am not sure when it was added.  You can get a roof plan for your coach from James Triana.  I have mine somewhere, I'll keep looking.

If you are lookinf for roof structure it is aluminum.  A better quality stud finder will locate them easily.  These are not cheap but one of the best you can get.

ProSensor 710 Franklin Sensors ProSensor 710 Precision Stud Finder Yellow -...

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.
Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN
 

Re: Drilling a hole to a larger size

Reply #7 –
Had to enlarge and offset my coach speaker
round openings on the bottom of my walnut cabinets by  3/8" of a inch tried a fine tooth jigsaw but it was still lifting the veneer. One speaker will now extend slightly below a tambour door.  Ended up using my easily controlled drill with a small 1/8" bit to outline the hole as the drill is very easy to control location and cutting depth. Then used an old fine tooth hacksaw blade pushed towards the veneer to connect the dots or drill holes. Probably took me 10 minutes more per hole but I was able to catch cuttings as I drilled with a shop vac.  Not exactly perfect, but easily accomplished with common tools.
Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake