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  1. #16
    Join Date
    Aug 2003
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    Default

    Quote Originally Posted by dalejw View Post
    I guess the way I was thinking of it was the timber is fed in so the feed direction is against the rotation of the cutter head. Each time the blade strikes the timber, it is presented with a clean piece of timber which is where I reckon most of your blade wear comes from. The only time it cuts through the paint is on the upcut where it's lifting the chip away.

    I think it's debatable as to whether the upcut is actually forcing the blade through the paint of if it's just fracturing it off with the grain. Probably a bit of both I'd say but I reckon the vast majority of your blade wear comes from that instance where it goes from free rotation to slamming into the wood which should be paint free.

    Just bouncing some ideas around here.

    Whaddayarekon?

    http://upload.wikimedia.org/wikipedi...hicknesser.gif
    I drew that picture!

    The paint blunting blades could well be an urban myth, it's one of those things that is always thrown up when this subject comes up, which is often does. That is one of the standard answers given. I don't know if anyone has analysed the statement to the degree that you'd need to in order to prove anything. It may well be a combination of observation and intuition. Or it might be a furphy.

    Still I think it's reasonable advice to give and combined with the fact that you don't know what is under the paint, I think it's best to suggest when people ask the question that they remove the paint first. What people then choose to do in their own shed with their own equipment is up to them.
    "I don't practice what I preach because I'm not the kind of person I'm preaching to."

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  3. #17
    Join Date
    Dec 2004
    Location
    Perth
    Posts
    324

    Default

    Quote Originally Posted by silentC View Post
    I drew that picture!
    Ha! I just found that on Wikipedia

    I always just assumed I was damaging the blades using them on paint previously but was also pressed for time so just accepted I'd have to replace them more often. Don't think I ever really noticed the blades dulling faster though so I suspect if there is an effect it's going to be slight.

    Now that I've engaged the brain, I'd be a bit surprised if there was much of an effect at all from the paint. One nail, however, will ruin your whole day so you need to look for stuff like that.

    There are people that'll go to extraordinary lengths to get the most from their equipment. I was invited into the shed of a guy I used to work with. He had a few nice planes which he admitted he doesn't use because he's spent so much time getting them sharp that he doesn't want to blunt them

  4. #18
    Join Date
    Aug 2003
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    I just found that on Wikipedia
    I wrote the original article, the photo of the portable thicknesser is mine too. It was originally called 'Thicknesser' but then some Americans got involved

    Maybe someone with a scientific mind will take up the challenge re. paint and thicknesser, sorry 'thickness planer' blades
    "I don't practice what I preach because I'm not the kind of person I'm preaching to."

  5. #19
    Join Date
    Mar 2006
    Location
    West Chermside
    Posts
    119

    Default How to put dirty grubby timber through your planner thicknesser with out a care.

    Carefully select the timber you have been putting off processing in case it blunted or ruined your blades. Then using all the normal conventions of planning and thicknessing "GO AT IT HARD" You find a nail with the cutter move the fence to exclude the damaged section of blade. You now have all the scary timber nicely planned and preped.
    The trick to doing it without a care is the fact you will have your hellical head installed within 48 hours and the three blade head will be excess to requirements. Life is good.

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