uHeat Banner - Forum Discount Available
This official sponsor may provide discounts for members

Discuss am i right in thinking.... in the Electrical Forum area at ElectriciansForums.net

i=p/u

-
Arms
Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

have to install a fan tomorrow night and drill through red brick wall, am i right in thinking a when using 4inch core bit on red brick i have to start in reverse to stop the brick breaking ....

think i read it before on the forum.. il take your advice gladly.. ya know me love free stff
 
Electrical2Go - Online Electrical Supplier
This official sponsor may provide discounts for members
S

Silly Sausage

have to install a fan tomorrow night and drill through red brick wall, am i right in thinking a when using 4inch core bit on red brick i have to start in reverse to stop the brick breaking ....

think i read it before on the forum.. il take your advice gladly.. ya know me love free stff
You like a free stiff? Steady boy!

Just start slowly so it cuts a neat circle then get stuck in, always worked for me.
 

Des 56

-
Arms
Esteemed
Slight angle,so that any water/moisture runs out not in
I would also expect running the core bit in reverse would be more chance of throwing you and the bit off the wall,
 

i=p/u

-
Arms
  • Thread Starter Thread Starter
  • #6
cheers , i only ask as ive seen few fans installed when out and about and seen red breaks slightly broken. so ty
 

i=p/u

-
Arms
  • Thread Starter Thread Starter
  • #7
if im putting bit of 4inc pipe in wall the fan wouldnt go on then....
Slight angle,so that any water/moisture runs out not in
I would also expect running the core bit in reverse would be more chance of throwing you and the bit off the wall,
 
G

Guest55

Wouldnt make any difference forward / reverse as the core cutting teeth arent angled.
;-)
 

Des 56

-
Arms
Esteemed

Wouldnt make any difference forward / reverse as the core cutting teeth arent angled.

Your probably too right there Biff,its more the expectation of where the load usually comes on the wrists I was thinking


if im putting bit of 4inc pipe in wall the fan wouldnt go on then

I can honestly say,I have never had that problem
When I mentioned slight angle,I really meant slight angle,








 
Last edited:

darkwood

Mod
Mentor
Arms
Esteemed
Nobody seems to have mentioned to drill a long pilot through first so the cutter isn't been held back by the pilot bit then make sure you drill in from the outside brick to stop unsightly blast out, it dont matter too much inside as its covered by plaster.
 

DNS1

-
Arms
Esteemed
Exactly what I was going to say darkwood!

This thread immediately got me thinking of another a few months ago when I guy was tearing his hair out trying to repair the blast damage that his customer was going mad about!
 

i=p/u

-
Arms
  • Thread Starter Thread Starter
  • #12
well im hoping no need for plaster, nice clean cut... but maybe im dreaming
Nobody seems to have mentioned to drill a long pilot through first so the cutter isn't been held back by the pilot bit then make sure you drill in from the outside brick to stop unsightly blast out, it dont matter too much inside as its covered by plaster.
 

Strima

-
Arms
Esteemed
My favoured method is to run a pilot through first, then cut in from outside using the core guide about 10mm, then cut from inside all the way through, 99% of the time I've managed to avoid blast out.
 

darkwood

Mod
Mentor
Arms
Esteemed
well im hoping no need for plaster, nice clean cut... but maybe im dreaming
easy way drill from both sides to cavity, but getting it to drill straight is an art form .... running of a mm or 2 could stop your 4" sleeve going through hence its best if possible to pass through all one way.

The customer has the right to sue you if you leave unsightly blast out and she will probably get the costs of rectifying the damage back + legal fees
 
M

MarkieSparkie

Nobody seems to have mentioned to drill a long pilot through first so the cutter isn't been held back by the pilot bit then make sure you drill in from the outside brick to stop unsightly blast out, it dont matter too much inside as its covered by plaster.
The main advantage of dry cutting outside to inside with a diamond core is the majority of the dust and mess is deposited outside rather than inside the property and is easier to clean up. This is often only practical on the ground floor or if scaffolding is erected.
If you are getting 'blast-out' using a diamond core (cutting in either direction), your technique is wrong, you are applying to much forward feed pressure. The forward pressure should be minimal, just enough to keep the core centred and on track, the diamond lands will cut faster, more cleanly and with less heating of the core. Using the correct technique the exit should have no discernible break-out, or minimal break-out if the exit is through loose dry plaster.
Some of my left-handed colleges prefer to core drill with the drill in reverse (anti-clockwise) rotation, they say it's more comfortable, however this technique is not generally recommended as it risks unscrewing the core from the arbor.
Generally, a long pre-drilled pilot hole through the wall is not needed, but may be of advantage when cutting extremely hard materials eg. granite, or you are a novice core drill user and require the greater guidance. All that is required is to start the core with the pilot drill attached, once the core is centred and the diamond lands have cut to at least half the core's full depth, the pilot drill can then be removed, and rest can be cut with just the core, without it deviating significantly from your initial trajectory providing the forward feed pressure is not excessive.
 
Last edited by a moderator:
Test Meter - Forum Sponsors since 2007!
This official sponsor may provide discounts for members

Reply to am i right in thinking.... in the Electrical Forum area at ElectriciansForums.net

Instyle LED Lighting Specialists UK
This official sponsor may provide discounts for members
Aico 3000 Range
This official sponsor may provide discounts for members
Top Bottom