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Attaching a wooden disc to a Rotary Table without break through

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Greensands09/09/2021 21:18:39
261 forum posts
47 photos

Hi - Can anyone suggest a possible method of attaching a 9" diameter by 3/4" thick wooden disc onto a 5" diameter rotary table without if possible breaking through to the top surface. The object is to use the disc as a rotary paper drawing board with a fine tipped pen loaded into the spindle and it is therefore desirable to keep the upper surface free from any indentation. The rotary table as can been seen is fitted with the conventional Tee slots. All suggestions and ideas are most welcomed.

roy entwistle09/09/2021 21:24:53
1436 forum posts

Attach a disc of wood to the table with countersunk screws the attach your 9" disk to that with double sided sticky tape. Carpet fitting tape is ideal

Roy

John Haine09/09/2021 21:31:48
4272 forum posts
251 photos

Go to B&Q and buy a roll of 2 inch wide blue masking tape and a squeezy bottle of their superglue.

Cover the surface of the table with blue tape, also the underside of the wood.

Squeeze & spread superglue thinly on the table; attach the disc and clamp down firmly for a few minutes.

When you have finished, be fairly brutal about pulling the wood off. The blue tape stops the glue actually sticking to the wood or the table.

This method will hold down plate for CNC milling so should be plenty strong enough for your purpose.

Greensands09/09/2021 21:36:47
261 forum posts
47 photos

img_9984.jpgShould have attached these two pics to illustrate the table and discimg_9983.jpg.

Michael Gilligan09/09/2021 21:45:55
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19291 forum posts
960 photos

Cut shallow recesses in the underside of the disc and glue-in some small magnets

MichaelG.

Derek Lane09/09/2021 22:01:08
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568 forum posts
112 photos

Something that I use in woodturning is a hot melt glue gun when finished just warm the piece and it is easily removed. You only need to apply the glue around the edge so a heat gun can soften the glue for removal

JasonB10/09/2021 07:02:49
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make some simple blocks with pegs on them to locate into the holes around the edge of your table and screw upwards through them into the wood.

Wout Moerman10/09/2021 07:04:24
55 forum posts
2 photos

Do I understand it correctly that you want to be able to reattach the wooden platter? The magnet suggestion seems great for that purpose. You want to use it as a plotter table?

DC31k10/09/2021 07:38:26
586 forum posts
1 photos

You do not say how often you need to attach and remove the disk nor how concentric or repeatable the process needs to be.

The magnets is a good idea, but may have too many degrees of freedom. If you bore a shallow recess, the diameter of the table, in the underside of the disk, you assure concentricity (but not repeatable clocking).

The blue tape and supeglue is good for a one off where concentricity is not important.

The blocks and screws is reasonable for both so long as you number the blocks and use the same screw holes.

Sand three rectangular blocks to fit the T-slots (width and height). Put a couple of sheets of paper under them so they stick slightly above the T-slot. Glue the disk to them with a heavy weight on it until the glue sets. It is a one-off challenge to make the disk concentric but after that, so long as you mark one block and one T-slot, it will always go back concentric and in the same clock position.

JasonB10/09/2021 07:56:39
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If you want to keep it concentric then just make a disc to fit the parallel hole in the middle of the table and glue/screw that to the underside of the wooden disc so it becomes a location spigot, works for my chucks so should be OK here

Michael Gilligan10/09/2021 08:13:23
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Posted by JasonB on 10/09/2021 07:56:39:

If you want to keep it concentric then just make a disc to fit the parallel hole in the middle of the table and glue/screw that to the underside of the wooden disc so it becomes a location spigot, works for my chucks so should be OK here

.

Quite so yes … and to constrain (unidirectional) rotation only needs one additional peg to locate in a tee-sot

[ none of which was part of the actual question ]

MichaelG.

Edited By Michael Gilligan on 10/09/2021 08:14:41

Ady110/09/2021 08:14:50
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4816 forum posts
717 photos

pinkgrip

clean the metal properly

4 spots at 3 6 9 12 oclock

you may break the wood getting it off

EDIT will you not at least need a centre hole to get good concentricity

Edited By Ady1 on 10/09/2021 08:17:36

Juddy10/09/2021 08:19:21
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91 forum posts

Glue four tenons under the disc to match the tee slot positions and place on the RT, number them and the slots so you can place it back in the same place each use. It won’t move under the pressure of a pen. No need to glue to the RT if the tenons are a good fit.

Ady110/09/2021 08:24:01
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4816 forum posts
717 photos

Screw 4 slot shaped wooden slats underneath with neodymium magnets as feet to fit into the slots and up against the central boss

Then you can yank it on and off as much as you like

Glue the neo magnets on with pinkgrip

Edited By Ady1 on 10/09/2021 08:30:38

Greensands10/09/2021 09:01:39
261 forum posts
47 photos

Thanks for all the very interesting replies. The idea is for the wooden disc to be an easily replaceable fitting and the use of magnets as opposed to an adhesive would appear to be the way ahead for use as an occasional plotting table. Pinkgrip is a new one on me and so I will need to explore. Other possible uses of the table would be for some light milling exercises akin to engraving where loads would not be excessive.

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