T nut should work you can find them many places
http://www.allproducts.com/twfastener/zyhyin/16.html

Wayne

"jim evans" wrote in message
...

I need to screw something to the bottom of a desktop made of 1"
particle board (the upper surface is wood veneer). It will experience
a fair amount of load, so I need the screws to hold securely. If it
were solid wood or plywood I would be confident it would hold, but my
experience is particle board does not hold screws well -- they crumble
out.

So, my question is, how can I put screws in the particle board such
that they will hold securely?

jim

On 11/29/2004 9:03 PM US(ET), jim evans took fingers to keys, and typed
the following:

I need to screw something to the bottom of a desktop made of 1"
particle board (the upper surface is wood veneer). It will experience
a fair amount of load, so I need the screws to hold securely. If it
were solid wood or plywood I would be confident it would hold, but my
experience is particle board does not hold screws well -- they crumble
out.

So, my question is, how can I put screws in the particle board such
that they will hold securely?

jim


A *lot* of L brackets?

How can you assure the T nut will not pull out? They don't seem to be made
to hold well into particle board with just the barbs.
-------------
It works like a screw/nut arrangement. You drill a hole through the
board for the center of the T-nut to go through, then tap it in place
from the back side with a hammer. The screw goes into the center of
the T-nut from the front.

It's a very strong setup.

You might look for this type of fastener. T-nuts are great if you
can go all the way through the material. It sounds as if you want
the fasteners not to go through.

http://www.ezlok.com/frameset.html?h...k.com/wood.htm

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Keep the whole world singing . . . .
DanG (remove the sevens)




"jim evans" wrote in message
...

I need to screw something to the bottom of a desktop made of 1"
particle board (the upper surface is wood veneer). It will
experience
a fair amount of load, so I need the screws to hold securely.
If it
were solid wood or plywood I would be confident it would hold,
but my
experience is particle board does not hold screws well -- they
crumble
out.

So, my question is, how can I put screws in the particle board
such
that they will hold securely?

jim

jim evans wrote:

I need to screw something to the bottom of a desktop made of 1"
particle board (the upper surface is wood veneer). It will experience
a fair amount of load, so I need the screws to hold securely. If it
were solid wood or plywood I would be confident it would hold, but my
experience is particle board does not hold screws well -- they crumble
out.

So, my question is, how can I put screws in the particle board such
that they will hold securely?

jim

Check Google Groups.

What about particleboard screws [with or without wood glue]?

http://groups.google.com/groups?thre... news.aol.com

jim evans wrote:
I need to screw something to the bottom of a desktop made of 1"
particle board (the upper surface is wood veneer). It will experience
a fair amount of load, so I need the screws to hold securely. If it
were solid wood or plywood I would be confident it would hold, but my
experience is particle board does not hold screws well -- they crumble
out.

So, my question is, how can I put screws in the particle board such
that they will hold securely?

jim

The standard ways is to drill a hole the size of a dowel and glue the
dowel in the hole, then drill a hole for the screw in the dowel.
First you need a Forstner bit which drill as flat bottom hole and you
need to pick an appropriate size. 1/2" would probably be ok, but
3/4" or 1" would be needed for a heavier weight. Or, you could just
glue a piece of 3/4" board on the under side and put screws into the
board.

Abe wrote:
How can you assure the T nut will not pull out? They don't seem to be made
to hold well into particle board with just the barbs.

-------------
It works like a screw/nut arrangement. You drill a hole through the
board for the center of the T-nut to go through, then tap it in place
from the back side with a hammer. The screw goes into the center of
the T-nut from the front.

It's a very strong setup.

Uh guys, the top of the desk is veneered. It's too late to hide a T-nut
under there.

To the OP, simply drill small holes for the screws and be sure to apply
a lot of pressure when installing the wood screws. They should hold
quite well. By not drilling first, you tend to eat away at the hole
while trying to install the screw.

--
Tony

On Mon, 29 Nov 2004 23:11:34 -0600, jim evans
wrote:

I have to attach from underneath. This is a desktop -- I can't drill
a hole through the top surface of the desk.
----------------
Sorry about that. Somehow I glossed over that detail.

If you have to come up from underneath, then you're stuck with using a
particle board screw and yellow carpenter's glue.

Use a particle board screw with a nibbed head, as shown he
http://www.cabinetmart.com/60-N.html

sorry misread post no way it will work glue a piece of 2x4 or something al
little smaller probably 12" long using a good quality yellow wood glue or
gorilla glue with clamps while it dries then screw into that no way 1"
particle board will take any load trying to pull the screw out

Wayne


"willshak" wrote in message
...
On 11/29/2004 9:03 PM US(ET), jim evans took fingers to keys, and typed
the following:

I need to screw something to the bottom of a desktop made of 1"
particle board (the upper surface is wood veneer). It will experience
a fair amount of load, so I need the screws to hold securely. If it
were solid wood or plywood I would be confident it would hold, but my
experience is particle board does not hold screws well -- they crumble
out.
So, my question is, how can I put screws in the particle board such
that they will hold securely?

jim

A *lot* of L brackets?

jim evans wrote:
On Mon, 29 Nov 2004 21:52:09 -0500, willshak
wrote:

On 11/29/2004 9:03 PM US(ET), jim evans took fingers to keys, and
typed the following:

I need to screw something to the bottom of a desktop made of 1"
particle board (the upper surface is wood veneer). It will
experience a fair amount of load, so I need the screws to hold
securely. If it were solid wood or plywood I would be confident
it would hold, but my experience is particle board does not hold
screws well -- they crumble out.

So, my question is, how can I put screws in the particle board
such that they will hold securely?

jim


A *lot* of L brackets?

The thing I'm attaching is sort of like two metal slides and each
slide only provides for 3 screws.

Not a good situation. However, make your pilot holes, insert your
screws not quite all the way then back them out. Turn the desk over
and fill the holes with cyanoacrylic glue; if it isn't all absorbed by
the particle board within a minute or two, wick out the excess with a
paper towel. Let it harden for several hours then attach your
hardware.

The glue will have penetrated, hardened and welded the particle board
together around the holes, works pretty well. However, depending on
the load, I'd still be more comfortable gluing and screwing hardwood
strips under the desk - even 1/4" ones but 3/4 is better - and then
attaching the brackets to those.
--
dadiOH
____________________________

dadiOH's dandies v3.05...
....a help file of info about MP3s, recording from
LP/cassette and tips & tricks on this and that.
Get it at http://mysite.verizon.net/xico

jim evans wrote:
On Mon, 29 Nov 2004 23:08:14 -0600, Erma1ina
wrote:

jim evans wrote:

I need to screw something to the bottom of a desktop made of 1"
particle board (the upper surface is wood veneer). It will
experience a fair amount of load, so I need the screws to hold
securely. If it were solid wood or plywood I would be confident
it would hold, but my experience is particle board does not hold
screws well -- they crumble out.

So, my question is, how can I put screws in the particle board
such that they will hold securely?

jim

Check Google Groups.

What about particleboard screws [with or without wood glue]?


http://groups.google.com/groups?thre...AA09364%40ladd
er03.news.aol.com

Well, I'll be danged. I never thought about them making special
screws for particle board. Now to find where I can but 6 and not
pay $30 for a lifetime supply.

They aren't all that great for your purpose.

--
dadiOH
____________________________

dadiOH's dandies v3.05...
....a help file of info about MP3s, recording from
LP/cassette and tips & tricks on this and that.
Get it at http://mysite.verizon.net/xico

jim evans wrote:
On Tue, 30 Nov 2004 05:15:33 GMT, "George E. Cawthon"
wrote:

jim evans wrote:
I need to screw something to the bottom of a desktop made of 1"
particle board (the upper surface is wood veneer). It will
experience a fair amount of load, so I need the screws to hold
securely. If it were solid wood or plywood I would be confident
it would hold, but my experience is particle board does not hold
screws well -- they crumble out.

So, my question is, how can I put screws in the particle board
such that they will hold securely?

jim

The standard ways is to drill a hole the size of a dowel and glue
the dowel in the hole, then drill a hole for the screw in the
dowel. First you need a Forstner bit which drill as flat bottom
hole and you need to pick an appropriate size. 1/2" would
probably be ok, but 3/4" or 1" would be needed for a heavier
weight. Or, you could just glue a piece of 3/4" board on the
under side and put screws into the board.

Ah, yes. I knew you guys would come through. I like that solution.

jim

It isn't all that great for your purpose. The dowels, that is,
because you'll be screwing into their end grain. If you could insert
the dowels from the desk edge they would work fine.

--
dadiOH
____________________________

dadiOH's dandies v3.05...
....a help file of info about MP3s, recording from
LP/cassette and tips & tricks on this and that.
Get it at http://mysite.verizon.net/xico

According to dadiOH :
It isn't all that great for your purpose. The dowels, that is,
because you'll be screwing into their end grain. If you could insert
the dowels from the desk edge they would work fine.

The dowel idea is pretty good, but I'd use cross-grain _plugs_,
not dowels. You can buy such plugs from most hardware stores.

Another idea is to buy/make some thin strips (say, 1/2") of wood,
and bore for T-nuts, install T-nuts, then glue and screw the
strips as "battens" to the underside of the platform, and fasten the
thing being installed to the T-nuts.

Or, instead of T-nuts, just glue and screw the strips.

Or, use knockdown threaded barrel nuts. They have a bolt thread
on the inside, and a particle board thread on the outside. Bore
the appropriate hole, then screw the "nut" into it (usually an
allen key). Much stuff is built like this (ie: Ikea knock-down
furniture). Many places carry these things - like Home Depot,
Lee Valley or Woodcraft. Sometimes you can buy them as repair
parts from Ikea.

Particle board screws generally come in 2" lengths, designed to go
through a particle board sheet into the "end grain" of particle
board (eg: making boxes and cabinet carcases or hanging shelves).
You won't find particle boards short enough for the OP's purpose.

I do the screw and glue thing. Most of the time you need a bit of
a standoff to clear the lip of the counter anyway.

Fastening things to particle board is often difficult. Either
screws/glue and LOTS of surface area, or purpose-built fasteners
(like T-nuts or the aforesaid barrel nuts).
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.

I have 3 plug cutters that are used in the drillpress enabling wood
selection.

On 6 Dec 2004 16:08:25 GMT, (Chris Lewis)
wrote:

The dowel idea is pretty good, but I'd use cross-grain _plugs_,
not dowels. You can buy such plugs from most hardware stores.

[Earlja]

replying to Chris Lewis, Earlja wrote:
Go to home depot, and buy the size of "inser nuts" you need. A forstner bit
for the hole. Glue the inser nuts in place. I've never used the super glue
idea above, but it sounds like a good idea. Good luck!

--
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