|
|
#5
15th February 2012, 01:10 PM
|
|||
|
|||
Trouble with a large hole saw in grp is the pilot hole getting bigger as you drill then the hole saw starts to walk, thats when they start to snag. The method I use is to rivet a small plate in the middle of the hole <anything will do> mask the area you are drilling and drill from the gel coat side inwards. Never had a problem doing it this way even with a 130mm saw. The masking tape is enough to stop the plintering of the gel coat and the small plate will stop the drill walking. Oh and go slowly with a variable speed drill.
Bob
__________________
When The Results Disagree With The Theory: Believe The Results And Invent A New Theory If I had two brains I,d still be a halfwit The cave http://s1116.photobucket.com/user/my...deshow/mancave The build http://www.haynes.co.uk/forums/showthread.php?t=12669 
|
| Thread Tools | |
| Display Modes | |
|
|
Threaded Mode