Double sided sticky tape

I need to trephine a 5 3/8in hole in a 9in square 2.5mm ally sheet. I was planning on using an MDF backing bolted to the faceplate with edge clamps and a centre but decent edge clamps are going to get me close to the limits of swing unless i pull the gap (and for a simple job the nuisance of cleaning and putting it back..)

So recommendations please on a double-sided sticky MDF=> ally that i can actually get off again....

pgk

I've been a victim of double sided tape that was almost too good.

A hot air gun does the trick.

PGK,

Could you use the MDF as you say and bolt through the middle bit (disk) onto your back plate? assuming you don't want the middle bit with drilled holes in it.

Ed.

Just drill the waste for some screws/bolts and fix to the MDF or bolt right through the faceplate

My wife wanted to remove some adhesive-backed vinyl from a window today. My advice was to point a fan heater at it for a while, and it worked really well. I imagine a gentle dose of heat would help with removing double-sided tape as well.

Neil

Almost all glues soften with heat..but often there's a sticky residue that one spends ages with solvents to shift and gums up any abrasive. i rather wanted to keep the disc if possible...just seems a waste that diameter and a square edge keeper part coming off the lathe could be painful at that size if just the centre bolted?

No recommendations on sticky tape types?

..also I can't sneak upn the diameter..

pgk

If you get the depth of cut right the two bits stay as one and you then just kock out the middle like opening a cold meat tin.

I always find a big hammer works better than those silly metal keys

I presume you can't do what Jason advises because you don't have a big enough 4 jaw as your work is square ?

If so then stick your MDF to the face plate. liberally coat it with PVA wood glue and lay a thickish sheet of drawing / cartridge paper on it.

Liberally coat that with PVA, stick your alloy plate on and bung under a large weight overnight to dry.

Then trepan your circle out a tab undersize if it makes you happy, then bore to size. Soak MDF / Alloy in boiling water and it pops straight off.

Job done.

If you use a pad pressed on by the tailstock to keep the middle bit in place against the MDF then the outside could be held to the MDF by putting some roundhead or self tapping screws along the edges so the plate is just nipped up under the heads. That way you don't need to drill either plate, the screws will provide teh drive and the tailstock will stop the middle going AWOL

Another possibility is to use hot melt glue to attach the aluminium to the MDF. The aluminium will release cleanly from the glue after dripping isopropyl alcohol onto it. If the aluminium is pre-heated with a hairdryer / hot air gun the bond will be sufficient to carry out the trepanning operation.

Andrew.

Edited By Andrew Entwistle on 01/02/2015 20:57:24

Edited By Andrew Entwistle on 01/02/2015 20:57:46

Edited By Andrew Entwistle on 01/02/2015 21:00:00

Ah! The screwheads idea I like..upgraded perhaps with some washers... saves wasting tape too <s>

I'll take a shot at that once the current job run is finished.

Thanks guys (again)

pgk

Milling machine & rotary table?

Just an idea !

How about using the adhesive pads that are used to stick photo frame hooks to the wall. They are double sided tape with a tab that you pull to release the hook.

Paul.

There's a lot of double-sided tapes about. Id just hoped with my post that someone might have had experience wth a specific type for this sort of application. Or indeed with glur technologies. For a surface this large t's less a matter of adhesion as of side (shearing?) movement.

Something like the glue on post-it notes woud probbaly ahve done. For really strong adehsions then the stuff used to stick car bumpers on would be way efficient but might be a b*****r to remove. Mounting tapes and pads - well the padding will introduce some side movement..

I'll likely go with the screws. In fact since the square will be screwed on a frame on it's edges I can drill those holes before trephining and use them to mount - which this dumbo hadn't thought of before.

I use ex cupboard panels (Melamine faced chipboard) as a backing on the faceplate. Any sort of "twinstick" hangs onto that. Clamping pad held onto job with a rotating tailstock ensures safety.

Regards Ian.

I use the pads for sticking rear view mirrors on car windows sticks like s**t to blanket but will release with any solvent,ie pre heat with hair dryer once removed Nick the wife nail varnish remover it will remove any residue

Re undoing double sided tape.

A trick I use is sticking masking tape on both surfaces that you want to temporarily join and use the double sided tape between. It holds well, it's easy to take apart and it doesn't leave any mess unless you use cheapo masking tape.

Hope this helps.

You can buy a can of label remover which will quickly soften any sticky tape or label even stuck on for years. One I know is Ambersil and any stationary store should have it, just give it time to soak in and penetrate. This the same stuff they use to de-ice aircraft I think and made from the zest of oranges.

Clive