Biscuit jointer cutter for routers

[ByronBlack]

sorry guy's, I didn't make myself that clear. Basically what I meant was, should the ply tongues run along almost the entire length of the piece; which in my case is 48" - I meant 80% of that. I.e the tongue sits inside a stopped groove/trench which runs almost the full length of the staves, but with some space either side un-grooved..

I think that probably sounds even more confusing

 

[Scrit]

The last thing I want is for a year or so down the line, the staves start working loose.

If your edges are properly jointed and the joints are properly glued and cramped this shouldn't happen in any case (especially if you use a true gap-filling water-tight glue such as UF)

I was thinking of making the tongues about 80% of the width of the staves.

Just run the loose tongue grooves to within a couple of inches of the ends of the staves. Percentages don't mean a lot in this sort o itance

Scrit

 

[ByronBlack]

Scrit - glad you understood what I meant - i'll stick to inches from now on

What do you mean by UF glue?

 

[Scrit]

What do you mean by UF glue?

Urea formaldehyde glue, sometimes referred (in the USA) as resin or plastic resin glue. It is fundamentally the same sort of glue to bond plywoods together and is extremely strong, water-resistant and has gap-filling properties (unlike PVA or aliphatic resins). Commonly known under the trade names of Cascamite, Extramite, Aerolite, etc and available in 1-pack and 2-pack formulations. There's a "how to use" here

Scrit

 

[ByronBlack]

Thats great, scrit, thanks!

 

[Scrit]

You might like to know it was UF glue which made possible the "wooden wonder" (Mosquito fighter/momber) of WWII

Scrit

 

[ByronBlack]

What an interesting fact scrit, if we enter a WWIII atleast I know my workbench will be up to it

 

[Scrit]

Maybe, but I'm not so sure I'd have been happy flying around in something literally held together by glue and string....... Then again the RAF obviously have a sense of humour - didn't they used to joke that the Avro Shackleton (last descendant of the famous Lancaster bomber) was "10,000 loose rivets flying in close formation" ? :wink:

Scrit

 

[RogerS]

The other benefit of ply over biscuits that I can see (but not actually tried) is that with biscuits you start off with a basically sloppy fit to allow for expansion..which means that you have to faff around with clamps etc (difficult if you're using biscuits to edge joint some bit of floorboard or whatever). Also possibility of surfaces ending up slightly out of line if not clamped.

With ply you can make a snug joint from the start.