Has anyone any bright ideas how to make shallow, blind holes in closed
cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep (the
foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a
forstner bit might work. I have a router and a small, quite high
speed, pillar drill. I don't at present have any forstner bits.
So I will probably try the router but opinions on the forstner bit
instead would be welcome.
On 08/04/2024 16:33, Chris Green wrote:
Has anyone any bright ideas how to make shallow, blind holes in closed
cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep (the
foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a
forstner bit might work. I have a router and a small, quite high
speed, pillar drill. I don't at present have any forstner bits.
So I will probably try the router but opinions on the forstner bit
instead would be welcome.
A router will give you a flat bottomed hole, and accurate control of the depth. You could probably stick a router bit in the pillar drill if you wanted...
Has anyone any bright ideas how to make shallow, blind holes in closed
cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep (the
foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a
forstner bit might work. I have a router and a small, quite high
speed, pillar drill. I don't at present have any forstner bits.
So I will probably try the router but opinions on the forstner bit
instead would be welcome.
John Rumm <see.my.signature@nowhere.null> wrote:
On 08/04/2024 16:33, Chris Green wrote:
Has anyone any bright ideas how to make shallow, blind holes in closed cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep (the
foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a forstner bit might work. I have a router and a small, quite high
speed, pillar drill. I don't at present have any forstner bits.
So I will probably try the router but opinions on the forstner bit instead would be welcome.
A router will give you a flat bottomed hole, and accurate control of the depth. You could probably stick a router bit in the pillar drill if you wanted...
"A router bit in the pillar drill", that's an idea which will be easy
to try, thank you. I may actually get round to trying it later today.
I will report on results.
Has anyone any bright ideas how to make shallow, blind holes in closed
cell foam?
Has anyone any bright ideas how to make shallow, blind holes in closed
cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep (the
foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a
forstner bit might work. I have a router and a small, quite high
speed, pillar drill. I don't at present have any forstner bits.
So I will probably try the router but opinions on the forstner bit
instead would be welcome.
On 09/04/2024 17:51, Chris Green wrote:
Chris Green <cl@isbd.net> wrote:
John Rumm <see.my.signature@nowhere.null> wrote:It worked pretty well in that it cut away the foam neatly but it
On 08/04/2024 16:33, Chris Green wrote:"A router bit in the pillar drill", that's an idea which will be easy
Has anyone any bright ideas how to make shallow, blind holes in closed >>>> cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep (the >>>> foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a
forstner bit might work. I have a router and a small, quite high
speed, pillar drill. I don't at present have any forstner bits.
So I will probably try the router but opinions on the forstner bit
instead would be welcome.
A router will give you a flat bottomed hole, and accurate control of the >>> depth. You could probably stick a router bit in the pillar drill if you >>> wanted...
to try, thank you. I may actually get round to trying it later today.
I will report on results.
didn't produce a flat bottomed hole, it cut a neat circular channel. I think maybe some Forstner bits may get closer to the flat bottom I'm
after.
A Forstner bit would certainly be my first choice. Even they have a
small locating spike in the middle, so the bottom won't be totally flat unless you grind off the spike.
Aldi and Lidl often have cheap sets which would probably be sufficient
for your purposes.
On 10/04/2024 09:35, Chris Green wrote:
Roger Mills <mills37.fslife@gmail.com> wrote:
On 09/04/2024 17:51, Chris Green wrote:
Chris Green <cl@isbd.net> wrote:
John Rumm <see.my.signature@nowhere.null> wrote:It worked pretty well in that it cut away the foam neatly but it
On 08/04/2024 16:33, Chris Green wrote:"A router bit in the pillar drill", that's an idea which will be easy >>>>> to try, thank you. I may actually get round to trying it later today. >>>>> I will report on results.
Has anyone any bright ideas how to make shallow, blind holes in
closed
cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep (the >>>>>>> foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a >>>>>>> forstner bit might work. I have a router and a small, quite high >>>>>>> speed, pillar drill. I don't at present have any forstner bits. >>>>>>>
So I will probably try the router but opinions on the forstner bit >>>>>>> instead would be welcome.
A router will give you a flat bottomed hole, and accurate control
of the
depth. You could probably stick a router bit in the pillar drill
if you
wanted...
didn't produce a flat bottomed hole, it cut a neat circular channel. I >>>> think maybe some Forstner bits may get closer to the flat bottom I'm
after.
A Forstner bit would certainly be my first choice. Even they have a
small locating spike in the middle, so the bottom won't be totally flat
unless you grind off the spike.
Aldi and Lidl often have cheap sets which would probably be sufficient
for your purposes.
The hole in the middle won't matter. I've ordered a cheap set from
Amazon for the princely sum of £14.99. it has the 10mm, 12mm and 15mm
diameters I need (plus 16 others!).
They should arrive today so we'll see! :-)
Although nothing in the size you want, the hole cutters made of plastic
used for cutting shallow holes in (exterior) foam insulation are
somewhat open probably to allow balled up foam to easily escape during drilling.
https://www.shopewi.co.uk/product/plastic-ewi-router-for-eps-insulation-boards/
On 10/04/2024 10:23, alan_m wrote:
On 10/04/2024 09:35, Chris Green wrote:That is simply a hole saw. and if the pilot hole it leaves is not an issue why not get a proper set..?
Roger Mills <mills37.fslife@gmail.com> wrote:
On 09/04/2024 17:51, Chris Green wrote:
Chris Green <cl@isbd.net> wrote:
John Rumm <see.my.signature@nowhere.null> wrote:It worked pretty well in that it cut away the foam neatly but it
On 08/04/2024 16:33, Chris Green wrote:"A router bit in the pillar drill", that's an idea which will be easy >>>>>> to try, thank you. I may actually get round to trying it later
Has anyone any bright ideas how to make shallow, blind holes in >>>>>>>> closed
cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep >>>>>>>> (the
foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a >>>>>>>> forstner bit might work. I have a router and a small, quite high >>>>>>>> speed, pillar drill. I don't at present have any forstner bits. >>>>>>>>
So I will probably try the router but opinions on the forstner bit >>>>>>>> instead would be welcome.
A router will give you a flat bottomed hole, and accurate control >>>>>>> of the
depth. You could probably stick a router bit in the pillar drill >>>>>>> if you
wanted...
today.
I will report on results.
didn't produce a flat bottomed hole, it cut a neat circular channel. I >>>>> think maybe some Forstner bits may get closer to the flat bottom I'm >>>>> after.
A Forstner bit would certainly be my first choice. Even they have a
small locating spike in the middle, so the bottom won't be totally flat >>>> unless you grind off the spike.
Aldi and Lidl often have cheap sets which would probably be sufficient >>>> for your purposes.
The hole in the middle won't matter. I've ordered a cheap set from
Amazon for the princely sum of £14.99. it has the 10mm, 12mm and 15mm
diameters I need (plus 16 others!).
They should arrive today so we'll see! :-)
Although nothing in the size you want, the hole cutters made of
plastic used for cutting shallow holes in (exterior) foam insulation
are somewhat open probably to allow balled up foam to easily escape
during drilling.
https://www.shopewi.co.uk/product/plastic-ewi-router-for-eps-insulation-boards/
Roger Mills <mills37.fslife@gmail.com> wrote:
On 09/04/2024 17:51, Chris Green wrote:
Chris Green <cl@isbd.net> wrote:
John Rumm <see.my.signature@nowhere.null> wrote:It worked pretty well in that it cut away the foam neatly but it
On 08/04/2024 16:33, Chris Green wrote:"A router bit in the pillar drill", that's an idea which will be easy
Has anyone any bright ideas how to make shallow, blind holes in closed >>>>>> cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep (the >>>>>> foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a
forstner bit might work. I have a router and a small, quite high
speed, pillar drill. I don't at present have any forstner bits.
So I will probably try the router but opinions on the forstner bit >>>>>> instead would be welcome.
A router will give you a flat bottomed hole, and accurate control of the >>>>> depth. You could probably stick a router bit in the pillar drill if you >>>>> wanted...
to try, thank you. I may actually get round to trying it later today. >>>> I will report on results.
didn't produce a flat bottomed hole, it cut a neat circular channel. I
think maybe some Forstner bits may get closer to the flat bottom I'm
after.
A Forstner bit would certainly be my first choice. Even they have a
small locating spike in the middle, so the bottom won't be totally flat
unless you grind off the spike.
Aldi and Lidl often have cheap sets which would probably be sufficient
for your purposes.
The hole in the middle won't matter. I've ordered a cheap set from
Amazon for the princely sum of £14.99. it has the 10mm, 12mm and 15mm diameters I need (plus 16 others!).
They should arrive today so we'll see! :-)
A Forstner bit would certainly be my first choice. Even they have a
small locating spike in the middle, so the bottom won't be totally flat >>> unless you grind off the spike.
Aldi and Lidl often have cheap sets which would probably be sufficient >>> for your purposes.
The hole in the middle won't matter. I've ordered a cheap set from
Amazon for the princely sum of £14.99. it has the 10mm, 12mm and 15mm
diameters I need (plus 16 others!).
They should arrive today so we'll see! :-)
Although nothing in the size you want, the hole cutters made of plastic used for cutting shallow holes in (exterior) foam insulation are
somewhat open probably to allow balled up foam to easily escape during drilling.
https://www.shopewi.co.uk/product/plastic-ewi-router-for-eps-insulation-boards/
That is simply a hole saw. and if the pilot hole it leaves is not an
issue why not get a proper set..?
https://www.diy.com/departments/carbon-steel-5-piece-holesaw-set/1732845_BQ.prd
Hardly a bank breaker
But I see you already spent more at amazon :-)
It is not a normal hole saw since it has radial teeth as well - it is designed to mill out a cylindrical pocket, not just cut the annulus.
Chris Green <cl@isbd.net> wrote:
John Rumm <see.my.signature@nowhere.null> wrote:It worked pretty well in that it cut away the foam neatly but it
On 08/04/2024 16:33, Chris Green wrote:"A router bit in the pillar drill", that's an idea which will be easy
Has anyone any bright ideas how to make shallow, blind holes in closed >>>> cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep (the
foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a
forstner bit might work. I have a router and a small, quite high
speed, pillar drill. I don't at present have any forstner bits.
So I will probably try the router but opinions on the forstner bit
instead would be welcome.
A router will give you a flat bottomed hole, and accurate control of the >>> depth. You could probably stick a router bit in the pillar drill if you
wanted...
to try, thank you. I may actually get round to trying it later today.
I will report on results.
didn't produce a flat bottomed hole, it cut a neat circular channel.
On 09/04/2024 17:51, Chris Green wrote:
Chris Green <cl@isbd.net> wrote:
John Rumm <see.my.signature@nowhere.null> wrote:It worked pretty well in that it cut away the foam neatly but it
On 08/04/2024 16:33, Chris Green wrote:"A router bit in the pillar drill", that's an idea which will be easy
Has anyone any bright ideas how to make shallow, blind holes in closed >>>> cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep (the >>>> foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a
forstner bit might work. I have a router and a small, quite high
speed, pillar drill. I don't at present have any forstner bits.
So I will probably try the router but opinions on the forstner bit
instead would be welcome.
A router will give you a flat bottomed hole, and accurate control of the >>> depth. You could probably stick a router bit in the pillar drill if you >>> wanted...
to try, thank you. I may actually get round to trying it later today.
I will report on results.
didn't produce a flat bottomed hole, it cut a neat circular channel.
What kind of router cutter was it (straight flute, or up cut / down cut spiral)?
Also small router cutters normally expect fairly high RPMs - 20K ish -
so the cut may not be as clean at drill speeds.
John Rumm <see.my.signature@nowhere.null> wrote:Grind the protruding bits off the bottom of the cutters ...
On 09/04/2024 17:51, Chris Green wrote:It was a 'straight' cutter for making parallel sided round holes. It's
Chris Green <cl@isbd.net> wrote:
John Rumm <see.my.signature@nowhere.null> wrote:It worked pretty well in that it cut away the foam neatly but it
On 08/04/2024 16:33, Chris Green wrote:"A router bit in the pillar drill", that's an idea which will be easy
Has anyone any bright ideas how to make shallow, blind holes in closed >>>>>> cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep (the >>>>>> foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a
forstner bit might work. I have a router and a small, quite high
speed, pillar drill. I don't at present have any forstner bits.
So I will probably try the router but opinions on the forstner bit >>>>>> instead would be welcome.
A router will give you a flat bottomed hole, and accurate control of the >>>>> depth. You could probably stick a router bit in the pillar drill if you >>>>> wanted...
to try, thank you. I may actually get round to trying it later today. >>>> I will report on results.
didn't produce a flat bottomed hole, it cut a neat circular channel.
What kind of router cutter was it (straight flute, or up cut / down cut
spiral)?
from a set I bought many years ago (20+) from Screwfix I think. It
cut quite well (i.e. cleanly) the issue is that the cutters on the
sides project a couple of mm beyond the cutter on the end that removes material from the hole. Thus for my 2mm or 3mm deep holes it didn't
work too well.
Also small router cutters normally expect fairly high RPMs - 20K ish -
so the cut may not be as clean at drill speeds.
alan_m wrote:
https://www.shopewi.co.uk/product/plastic-ewi-router-for-eps-insulation-boards/
That is simply a hole saw.
Has anyone any bright ideas how to make shallow, blind holes in closed
cell foam? It is Plastazote foam so quite dense and stiff.
I want to make 12mm or 15mm diameter depressions about 3mm deep (the
foam is 10mm thick).
I was wondering if using a plunge router or a pillar drill with a
forstner bit might work. I have a router and a small, quite high
speed, pillar drill. I don't at present have any forstner bits.
So I will probably try the router but opinions on the forstner bit
instead would be welcome.
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