Suspended shelf construction

Counter bored to allow the nut to be hidden sounds like a good option. Also you can actually tap a thread into MDF and screw your threaded rod straight in. The thread will be quite strong since you are not repeatedly undoing and remaking the join.

repeatedly undoing and remaking the join. Not that I doubt you about the strength, but I don't think I'm in a hurry to entrust my projector to four screw threads tapped into MDF. Sinking the nuts into the shelf and filling the holes sounds good. Thanks.

I have in the past used flanges which screw onto wood, board etc and take bolts or threaded rod like

I think I would be tempted to use a proper mount, since they give plenty of control of azimuth, elevation and yaw, which can make alignment much easier. They are also designed for easier installation since you can normally fix the main ceiling mount bit before adding the heavy bits.

Bert

I've used them in the past and I recognise the advantages but I just don't like the appearance of them I'm afraid. A suspended shelf can look like a built-in feature (however unlikely) which just happens to have had something plonked on to it; a single-column mount looks like nothing on earth. But thanks for the thought.

Adding longer feet to the equipment to raise it further above a solid surface can add to the airflow. I would guess that something that potentially gets very hot would have forced air cooling via a fan.

You're trying to fix a nonpronlem, 14kg is a breeze. MDF is the worst option for sag, try ply.

They are not all single column... many fit flat to the ceiling (I have a list of probably 300 from my supplier of AV kit)

But yup I take your point, you might as well go for works best for you visually.

a nonpronlem? Whats that when its at home?

I would expect the maker to provide recommended minimum clearance dimensions for a Video projector which might be ceiling mounted,

Thanks for that detailed reply. You might now have noticed another post which drew my attention to an Ikea table top made in exactly the honeycomb centre sandwich manner you talk about, and which I'm looking into.

Incidentally, you misunderstood my use of the term "suspended": what I meant was not what I would call a floating shelf, fixed to a wall by invisible supports, but literally suspended, hung from the ceiling:

Thanks.

I'm familiar with them (and have used one in the past) but for all their advantages I simply don't like the way they look.

I like your Steadycam idea but really don't think the concept is applicable in this case: I'm looking for a solution which gives a completely fixed location for the projector: movement, no matter how beautifully smooth, wouldn't be welcome.

Thanks for the thought, but though I have usedthat sort of mount in the past I simply don't like their appearance. There's something a little unsettling about an extremely bulky and heavy projector hanging in mid air with (from some angles at least) no visible means of support whatsoever.

And so they do, and so they did in this case, but in my experience, the more clearance, the better.