Bevelled edge on platform mount

[David McCormack]

Been using this method recently and getting to like it. I use an ultimat gold and always cut the aperture in the undermount using the bevel cut as it is easier and neater that a 90 degree cut. Should I be using a 90 degree cut or does it not matter? Got a few paper prints to mount and was just thinking should I start doing 90 cuts as per this diagram?

Drawing-PLATFORM EdgeView.jpg (141.65 KiB) Viewed 6096 times

[prospero]

I've been using this method for ages, but mainly on things that are thick or board-mounted.

I usually hang the art over the side of my drawing board, place the window mount on top and align it
where I want and then duck underneath and make pencil marks on the back of the mount where the edges
of the art are. Then flip it all over and make sure the art is still aligned. After that I run ds tape around - a
little way away from the art and pinwheel long, thin scrap bits of mb not-too-tight around the art. It doesn't
matter if they overhang because when they are all stuck and the art held in with a few tabs of tape I flip it
face up again and trim off the excess.

* I never glue the strips. Never had one fail although I do use proper ds tape and never ATG. Burnish it down
well and it will stay put. even if it does fail it's not going nowhere while it's in the frame. Nothing against glue
but I hold the view that liquids and mounting areas are not a good mix.

[Roboframer]

Bevelled is OK but 90 degree is better.

I've been using this method for ages, ........................... thin scrap bits of mb not-too-tight around the art.

Not the same.

A platform mount uses the fallout, you're talking about a sink mount.

[David McCormack]

I would describe that Prospero as a sink mount? I do the same for that method using pinwheel strips. But for the platform mount you need to cut an aperture and I currently do that with a bevel cut but the diagram shows a 90 degree cut.

[Steve N]

When you put the platform (fallout) back in, what stops the artwork being trapped between the fallout and the back of the mount, thus restricting movement of the artwork if there is any expansion

[David McCormack]

Good question

[Roboframer]

That's how it works "trapping" it between the fallout and the back of the mount but there is no pressure on it and the fallout aperture is a fraction larger than the paper to allow movement/expansion.

. Nothing against gluebut I hold the view that liquids and mounting areas are not a good mix

The adhesive here - and I use starch paste - is to fix the platform mount to the aperture mount and you don't put the artwork anywhere near it until it's dry.

You also cannot burnish DS tape through mount board.

[IFGL]

We use this method daily, I always cut the platform to a 90 degree angle.

[Steve N]

Robo wrote
"That's how it works "trapping" it between the fallout and the back of the mount but there is no pressure on it and the fallout aperture is a fraction larger than the paper to allow movement/expansion."

So very much the same as a conventional mount in regards to allowing the paper/artwork still to move

[IFGL]

I would say it works better than the conventional methods, there is no restriction to movement, apart from a bit of friction, not even an anchor point, whilst being supported all the way around.

[prospero]

Call it a sink mount or a platform, the end result is much the same. Personally, I don't call it anything at all.

When I mentioned liquids near mounts/art I'm not talking about what they might do when they are on the mount.
I talking about where they might accidentally splash/dribble to.

Yes you can burnish tape though mountboard. You just need to press harder.

[Roboframer]

I'm sorry but in the first post there's a diagram showing mount and platform mount glued together and you said you used strips of board and DS tape (not ATG) and explained why.

A platform mount is NOT the same as a sink mount - a platform mount actually mounts the artwork, a sink mount does not have a fallout to do the same job and is generally used for thicker things that a platform mount would not suit, you're basically making something flush - and a sink mount is not necessary or practical for anything on thin paper or card.

You can "apply a lot of pressure" to DS tape through mount board but burnishing tape is pretty self explanatory - you burnish the tape, directly, on to something.

This is basic stuff.

.

[Not your average framer]

A platform mount is NOT the same as a sink mount

This is true and it also a platform mount is a technically excellent way of mounting unreplacable items without in any way altering the original item.

you burnish the tape, directly, on to something

Again true, burnish involves friction and conforms the adhesive on the tape to the surface characteristics of the item it is belong stuck to and varstly increases the bond strength. Just pressure alone does not acheive the same result.

[David McCormack]

Thanks for replies, I'm using 90 degree cuts now