Existence of 42mm hole cutter

E

Equinox

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www.ihatechavs.com
After reading the instructions for the instillation of a speedlog paddlewheel I discovered I needed a 42mm hole cutter. I assumed this would be a fairly straight forward process to find one. I spent a rather unsuccessful afternoon travelling from one hardware shop to another in south London only to find 40mm and 44mm hole cutters but not the elusive 42mm bit. These were not even being sold as part of a set.

Can anybody please advise me where it may be possible to purchase a 42mm hole cutter in the south London/ north Kent area? Thanks in advance.

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To make a 42mmm hole cutter if you cannot get the correct size is to get one of the multi sized type as offered by B&Q etc and a large jubilee clip. These have an arbor and a selection of slot in blades - the blades are not continuos like in a traditional hole saw, so you can squeeze a blade down to 42mm with the jubilee clip.

alternatively use a 40mm and a get filling!

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Also how about a 52mm hole cutter for fitting a VDO hourmeter into a panel - looks like 50mm and a lot of filing is the only option.


<hr width=100% size=1>Alex Rogers
<A target="_blank" HREF=http://www.YachtsAtSea.com> www.YachtsAtSea.com </A>
 
I think everyone comes across this one !!!! I think it comes from transposing from imperial to metric !!!......

The 44mm is the 1.75" job, 40mm is the 1.5" job.

I cut a 40 then spent all day filing it out to 42 !!!!! Next time I will take my Dremel on board and use that to open out the 40 !!!!


<hr width=100% size=1>Nigel ...
Bilge Keelers get up further ! I came - cos they said was FREE Guinness !
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Last time I cut a through hull the b&q cutter was only JUST deep enough ..... so a jubilee clip may actually fall short on cutting depth ????
For my hole ..... the cockpit display was filed out .....

The Through hull was cut at 44 ...... because the flanges and inner nuts / washers were generous in size .... plus it allowed a good amount of sealant to sqeeze around the joint both sides etc. Never failed ..... had the boat for years like it - no prob. BUT that is MY way - not what I advise others to do ....


Good idea though with the clip - never thought of it !!


<hr width=100% size=1>Nigel ...
Bilge Keelers get up further ! I came - cos they said was FREE Guinness !
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If you need a non standard dimension exactly you need a tank cutter. It's a drill bit with an elbow shaped piece of tool steel attatched to it. See http://www.smithfrancistools.co.uk/tank.htm. The drill guides and the tool steel cuts extremely accurately. You can set it up on a piece of scrap until you get your dimensions exact.
John

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Try the screwfix adjustable hole cutter (part no D12620) cost £14.25. It'll do sizes 40-120mm. Max depth = 30mm.

Any use?

The other name for this type of tool is a 'Fly cutter', smaller ones (but withot pilot holes) are sold by Chronos see www.chronos.ltd.uk .

Regards

Richard.


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Agree, that's what I did. You'll have to glass in the fitting anyway just in case the exterior flange falls off! Apparently using anything other than a silicone sealant (like a polysulphide) weakens the plastic - or is it the other way round?

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yes, polysulphide should not be used with plastic I think, either silcone or polyurethane, go for polyurethane under the water line.

dont glass the fitting in though, plastic ring wont break off, probly made of glass filled nylon and in which case v tough and no force on it to make it break other than its own mass which is v little.

<hr width=100% size=1>Sod the Healey - I think I'll buy an E-Type.
 
i got a 42mm hole cutter from specialist tool shop in town,hope i don't need it again, so if you pm me maybe we can come to an agreement.

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43mm cutters seem reasonably easy to come by - I have one.

I can't believe an extra half mm all the way round would jeopardise the fitting... I used my 43 to fit my paddlewheel.



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I used 44mm when I fitted one last winter and the boat hasn't sunk yet... at least as of last weekend....

I suspect that if you tried to get a 42mm fitting through a 42mm hole you would struggle a bit, especially if the hull is thic. Personally I'd prefer to have a bit of clearance to fill than to force the paddlewheel in and risk damaging the thread. The flanges etc are much bigger than 44mm so it fits fine.

Chris


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Flycutters - use with care, and only in solid material, e.g. fibreglass, metal, etc. They are not counterbalanced so have an eccentric mass action. They would also be lethal with stray fingers. Given this, I usually use in a pillar drill only, not a hand-held jobby.

Enlarging a hole - if you need to enlarge a hole slightly, one of the abrasive flapwheels available from the DIY sheds is a faster and possibly more uniform method than a file.

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After cutting a large number of holes in fiberglass/marine ply to fit my eberspacher. The following is my recomendation - do not use the expanding cutter gizmo, do not use the standard cheap holesaw set. both of these will lead to problems. spend the money on bimetal cutters. If you cant quite get the right size then use the smaller one, but make sure you have scribed the correct size beforehand. Then use a flapwheel sander to expand the hole to the correct size. If you have the space, you may be able to use a rotozip to do the extra trimming, but the flapwheel is much more controllable. make sure you use a mask and gogles! - there will be a lot of dust!

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