A Question

This has been bugging me for years, but not enough for me to get around to actually finding out the answer.

When you buy DAR (dressed all round) softwood, it typically comes with faint grooves running the length of the timber.  (These are about 1mm apart).

Other than the possibility it is used to identify soft wood from hard, why are the grooves there, and how are they produced?  Grooved blades on the thicknesser I assume.  But to what benefit?

One brand is laserwood, but these days if you google that, all you get are countless ads for laser engravers!

9 Responses

  1. Are you sure it is not just the feed roller marks?

    • Too consistent, on all four faces, does not appear of DAR hardwood, so it is definitely deliberate, and not just a byproduct of a process.

  2. they gang rip it out of the last head on the molder, so it will be dress two faces fine sawn two edges,

    • Although it has the same fine grooves on all four faces, and they are definitely not saw marks. I assume it is some sort of molder cutter with the grooves included, but I’d like to actually know (especially with photos!)

  3. Hi Stu

    The process is called Rougher Heading or Header (RH). It is done with serated blades in a similar process to DAR. From what i can see from a few sites the advantages are that it hides minor imperfections and help to minimise splintering.

    • Awesome – thanks for that 🙂 I can finally put that question to rest!

  4. For plasterboard glue adhesion perhaps.

    • Good thought – wonder how much of a difference it makes.

  5. Hi Stu,
    I was told way back RH pays less import tax than DAR.

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