- Reaction score
- 54
+ 2mm addition to core drill sizes is more than enough for fitting flexi ducting . The bigger ducting size also reduces dB when in full power mode so 150mm is even better on a 100mm system.
Discuss Some advice regarding 125mm hole for cooker hood fan please? in the UK Electrical Forum area at ElectriciansForums.net
Like the technical talk there Will, "get a hammer and a block of wood and wack it out" nice bit of engineering speak like it.127mm is the standard for cookerhood extracts, if your struggling to fit the duct through get a hammer and block of wood and wack it.
It won't strain the motor (might even reduce the load slightly, depending on the characteristics of the motor) but it will reduce the flow for a given fan speed (as will more duct length or bends). Whether this matters to you or your customer is hard to judge.
To stop break of the material you are drilling through
Handyspacks as pete999 said saves a lot of making good
Not really drill through from one side until the pilot shows and then drill through from the other side with the core drill engaged, rocket science is not required.I've never had any break away of material on the exit side when using a core drill.
I guess if you have the drill on 'hammer' you would, but that's not how most core drills are used.
Surely, getting a core drilled hole to meet up accurately when drilled from both ends would be difficult?
Not really drill through from one side until the pilot shows and then drill through from the other side with the core drill engaged, rocket science is not required.
Do what's best for you Mate I'm only explaining the right way of doing it, if your way suits you carry on.But why would you bother? I've never had any problems with drilling from one side only with a core drill.
Not really drill through from one side until the pilot shows and then drill through from the other side with the core drill engaged, rocket science is not required.
Not really drill through from one side until the pilot shows and then drill through from the other side with the core drill engaged, rocket science is not required.
Think it's just the way you are shown How to do things , was always told to drill a pilot hole first then the biggy and go at it from both sides, but that was 34 years ago so things change with time, drill bits have got better and making good is just a bit of silicon
Now you have to agree that's bull shyeet, not the vid your statement it's only a bit of silicone.
220 x 90 mm is approx 6"I've just measured some rigid 100mm ducting I have Murdoch, the outer diameter is 103-104mm. I'm pretty sure with ducting (unlike conduit) the specified size is for the inner hole, stand to be corrected though? Flexible ducting, although more malleable has an even bigger outer diameter relative to its inner diameter.
I also remember drilling a 107mm hole for 100mm rigid ducting and it 'just' scrapes through.
lucky these days from what i have seen drill pilot hole, drill in 1" then club hammer, think it is in case they loose to many diamonds or is it too much time i am not sure maybe my age.Think it's just the way you are shown How to do things , was always told to drill a pilot hole first then the biggy and go at it from both sides, but that was 34 years ago so things change with time, drill bits have got better and making good is just a bit of silicon
Reply to Some advice regarding 125mm hole for cooker hood fan please? in the UK Electrical Forum area at ElectriciansForums.net
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