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Old 23 April 2006, 06:14   #11
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Thanks folks, I'll head down to B&Q and take a look at angle grinders.

That should take care of fitting the VHF, but I'm also planning to mount my chartplotter on top of the console using the supplied gimball bracket (not enough room to mount it in the console unfortunately), so I'll need to drill a large (1 inch) hole to allow the power / NMEA2K / sonar cables to pass through. What should I use to do that? My thinking was a small pilot hole and one of those drill bits that looks like a spade with a small triangle pointing down in the middle, but am worried sbout chipping - will gaffer tape do the job again?

Thanks again,
Fraser
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Old 23 April 2006, 06:37   #12
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If you mean this sort of thing - I wouldnt use it on fibreglass.

Much better off investing in a proper set of holesaws

http://www.screwfix.com/app/sfd/cat/...88630&id=45172
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Old 23 April 2006, 06:50   #13
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Whilst I agree with roycruse, I have to say, for a one off usage a flat drill is an ok way to go because the are cheap. They make the back of the the hole ragged as they burst through but if you can get to both sides with the drill, go through until the point protrudes and then drill from the outside to meet the the first drilling. You could buy the cheap version of the hole saws which you'll get in B&Q for a few kwid. They don't last long on fibreglass but they'll do a good few holes before you have to throw them away. The flat drill has the advantage that you can easily sharpen it so it lives for another day.
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Old 23 April 2006, 13:51   #14
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It's possible to buy a centre and a single blade for a holesaw-that's how I cut the hole for the steering on my console.
It's about 30 quid all in for a good quality one but the job it makes is worth every penny.

You can buy more blades when you need them once you have the centre.

I really wouldnt bother with a cheap B&Q holesaw. The first time they hang they destroy the centre lock and they make a really untidy messy job.

I didn't even have to dress the edges after using the good one I bought.
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Old 23 April 2006, 15:24   #15
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Quote:
It's possible to buy a centre and a single blade for a holesaw
I have one of these and it's much better than a regular hole saw, as you can adjust it to any diameter.....Plus you can sharpen the blades easily.
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Old 23 April 2006, 15:31   #16
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Originally Posted by Tim M
I have one of these and it's much better than a regular hole saw, as you can adjust it to any diameter.....Plus you can sharpen the blades easily.
Someone post a link of where these can be purchased from? I will be needing to cut a lot of holes soon...I was going to use my teeth, but i'm not sure I can get a clean edge.
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Old 23 April 2006, 15:32   #17
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Quote:
Originally Posted by Tim M
I have one of these and it's much better than a regular hole saw, as you can adjust it to any diameter.....Plus you can sharpen the blades easily.
Not quite what I meant-I meant you can buy the centre and one blade at a time that are the same as the pic in roycruse's post without having to pay a small fortune for a whole set.

The adjustable one might be worth looking into though.
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Old 23 April 2006, 15:43   #18
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try this- at 35.19 it'll do everything you want.

http://www.machinemart.co.uk/product.asp?p=060231026
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Old 23 April 2006, 15:55   #19
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Quote:
Originally Posted by Nos4r2
try this- at 35.19 it'll do everything you want.

http://www.machinemart.co.uk/product.asp?p=060231026
Thats the worse suggestion possible for someone who needs to drill a 1" hole - 35.19 and not a one inch cutter in sight.

The Bosch set I suggested earlier doeas have a 25mm (1") and I can personally vouch for these being supurb quality - they are what I used to drill a 2 " hole for my fuel flow meter last year.

If you want to save 10 here is a cheaper set that also includes a 1" cutter.

http://www.screwfix.com/app/sfd/cat/...e=null&homeRef=
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Old 23 April 2006, 16:02   #20
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just buy the arbor and then the hole saw for the size you are going to need. you can buy a different size hole saw and use the same arbor. the sets are not a good idea as you will find that unless you are an electrician or plumber, then you might only use 1 or 2 in the set. just like buying a 100 peice socket set for a 10mm, 13mm and a 17mm.
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