I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would prefer
something a bit easier to work, and the fixing holes would be rather close
to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs would
be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported at
one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?

--
*Dancing is a perpendicular expression of a horizontal desire *

Dave Plowman London SW
To e-mail, change noise into sound.

On 16/04/2019 14:14, Dave Plowman (News) wrote:
I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would prefer
something a bit easier to work, and the fixing holes would be rather close
to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs would
be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported at
one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?

At 5mm thickness and that sort of size cadging an offcut of Perspex from
your local shop sign makers would be one possibility.

--
Regards,
Martin Brown

On 16/04/2019 14:14, Dave Plowman (News) wrote:
I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would prefer
something a bit easier to work, and the fixing holes would be rather close
to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs would
be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported at
one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?

Get yourself some fibreglass mat and resin. Place a weight on top while
curing (use cling film to stop it sticking to everything) to make sure
it's flat. You can make it any thickness/size you like. Laminate it with
something (aero ply or plastic worktop laminate) to make it stiffer.

Alternatively, polycarbonate sheet might be OK.

On 16/04/2019 14:23, Martin Brown wrote:
On 16/04/2019 14:14, Dave Plowman (News) wrote:
I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would prefer
something a bit easier to work, and the fixing holes would be rather
close
to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs would
be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported at
one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?

At 5mm thickness and that sort of size cadging an offcut of Perspex from
your local shop sign makers would be one possibility.

The devil is in the detail so more info would help.

Perspex is a bit brittle. Nylon is tougher but may "creep" if the load
is continous. How much does that matter?

My material of choice would be tufnol

A buy it now of this

https://www.ebay.co.uk/itm/tufnol-sh...UAAOSwcOlal-zV

gives you 5cm x 5cm x 6mm for £3 but he can do you 8 cm x 5.4 cm x 6mm

On Tuesday, 16 April 2019 14:14:12 UTC+1, Dave Plowman (News) wrote:
I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would prefer
something a bit easier to work, and the fixing holes would be rather close
to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs would
be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported at
one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?

Acrylic, PVC, hardwood, ply, glass, layers of card plus a thin smear of epoxy between each (very strong), FR4 PCB, random plastic from bin, etc.


NT

On 16/04/2019 14:14, Dave Plowman (News) wrote:
I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would prefer
something a bit easier to work, and the fixing holes would be rather close
to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs would
be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported at
one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?


no-name plastic chopping board (and no need to travel further than your
nearest discount shop)?





--
Robin
reply-to address is (intended to be) valid

In article ,
newshound wrote:
At 5mm thickness and that sort of size cadging an offcut of Perspex from
your local shop sign makers would be one possibility.

The devil is in the detail so more info would help.

Perspex is a bit brittle. Nylon is tougher but may "creep" if the load
is continous. How much does that matter?

My material of choice would be tufnol

A buy it now of this

https://www.ebay.co.uk/itm/tufnol-sh...UAAOSwcOlal-zV

Tufnol. The name I couldn't remember, thanks. Was hoping I could pop out
and pick some up today, though.

--
*DOES THE LITTLE MERMAID WEAR AN ALGEBRA?

Dave Plowman London SW
To e-mail, change noise into sound.

In article ,
Martin Brown wrote:
On 16/04/2019 14:14, Dave Plowman (News) wrote:
I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would
prefer something a bit easier to work, and the fixing holes would be
rather close to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs
would be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported
at one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?

At 5mm thickness and that sort of size cadging an offcut of Perspex from
your local shop sign makers would be one possibility.

Not sure we have one of those anymore. Plenty of sheds close.

--
*A closed mouth gathers no feet.

Dave Plowman London SW
To e-mail, change noise into sound.

On 16/04/2019 15:00, Robin wrote:

no-name plastic chopping board (and no need to travel further than your
nearest discount shop)?

Can you buy Kevlar sheet?

On 16/04/2019 15:03, Dave Plowman (News) wrote:
In article ,
newshound wrote:
At 5mm thickness and that sort of size cadging an offcut of Perspex from
your local shop sign makers would be one possibility.

The devil is in the detail so more info would help.

Perspex is a bit brittle. Nylon is tougher but may "creep" if the load
is continous. How much does that matter?

My material of choice would be tufnol

A buy it now of this

https://www.ebay.co.uk/itm/tufnol-sh...UAAOSwcOlal-zV

Tufnol. The name I couldn't remember, thanks. Was hoping I could pop out
and pick some up today, though.

Perhaps a thin cutting board from a cooking shop?


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

In message ,
newshound writes
Perspex is a bit brittle.
In my garden shed here, I have a DBX card mounted on "perspex" to adapt
it to a 19" rack while keeping it insulated. The perspex (whatever it
actually is) has indeed shattered.

I always liked American valve guitar amps that used what looked like
vulcanised cardboard as the "chassis". Perhaps cut up an old suitcase?
--
Bill

On 16/04/2019 14:14, Dave Plowman (News) wrote:
I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would prefer
something a bit easier to work, and the fixing holes would be rather close
to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs would
be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported at
one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?

Buy some cheap sandwich boxes from Range and cut the bottoms out.

Bill

On 16/04/2019 14:14, Dave Plowman (News) wrote:
I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would prefer
something a bit easier to work, and the fixing holes would be rather close
to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs would
be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported at
one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?

white UPVC for soffits and the like might do? Often 6mm thick I think.
TW

On 16/04/2019 14:23, Martin Brown wrote:
On 16/04/2019 14:14, Dave Plowman (News) wrote:
I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would prefer
something a bit easier to work, and the fixing holes would be rather
close
to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs would
be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported at
one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?

At 5mm thickness and that sort of size cadging an offcut of Perspex from
your local shop sign makers would be one possibility.

paxolin is available in 4mm thickness

https://uk.rs-online.com/web/p/solid...heets/1941132/

Or epoxcy glass..

https://www.hobbyplastic.co.uk/index...u cts_id=7219


--
Labour - a bunch of rich people convincing poor people to vote for rich
people
by telling poor people that "other" rich people are the reason they are
poor.

Peter Thompson

On 16/04/2019 15:05, GB wrote:
On 16/04/2019 15:00, Robin wrote:

no-name plastic chopping board (and no need to travel further than
your nearest discount shop)?

Can you buy Kevlar sheet?

Of course. eBay is your friend.

One of the nice things about tufnol is that you can drill and tap it,
which is useful in some applications like this. It's used in industrial
switchgear, IIRC. So it might let you make a more compact structure than
using nuts and bolts to attach the "electrical" bits. Obviously, only
quite small bolts in 5 mm thickness.

But for "I need it today" I reckon the chopping board is the answer.
Either the thermoplastic sort, or the older rigid melamine laminates. In
fact they probably come close to tufnol in mechanical properties.

Dave Plowman (News) wrote:
I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would prefer
something a bit easier to work, and the fixing holes would be rather close
to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs would
be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported at
one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?

We used to use ,
ttp://www.btresources.com.au/products/industrialcomposites/canvasbakelitena

FMurtz wrote:
Dave Plowman (News) wrote:
I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would prefer
something a bit easier to work, and the fixing holes would be rather
close
to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs would
be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported at
one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?

We used to use ,
OOPS
http://www.btresources.com.au/produc...akelitenatural

On 16/04/2019 17:29, TimW wrote:
On 16/04/2019 14:14, Dave Plowman (News) wrote:
I need to find a substitute for aluminium plate which doesn't conduct
electricity. Thin ply would probably be strong enough, but would prefer
something a bit easier to work, and the fixing holes would be rather
close
to the edge for ply.

Something like a few layers of the glass fibre used for decent PCBs would
be good - or sheet of that about 5mm thick.

Size needed about 3x2" so small. Load less than a kilo, but supported at
one end only, so a fair twisting moment on it.

Anything I could pop along to a shed and buy?

white UPVC for soffits and the like might do? Often 6mm thick I think.
TW

Often double wall with an air gap... which might or might not be good
depending on the application.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Wed, 17 Apr 2019 07:48:07 +1000
FMurtz wrote:

FMurtz wrote:
Dave Plowman (News) wrote:
[...]
We used to use ,
OOPS
http://www.btresources.com.au/produc...akelitenatural

That's just off-brand Tufnol.