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  1. #16
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    Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.

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  3. #17
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    2500 strokes on 30 micron lapping compound to flatten the sole of a small block plane. Me smells an engineers foolhardiness in trying to prove a point.

    Stewie;

  4. #18
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    For those unaware of the grit size equivalent of 30 micron; https://www.gessweincanada.com/category-s/11328.htm

  5. #19
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    This stage of lapping has significantly reduced the out of flatness that I found after the 60 micron lapping. Now the maximum is something more like 0.00025"/3.25"

    WoodRiver block plane flatness ahead of mouth post 30 micron.jpgWoodRiver block plane flatness behind mouth post 30 micron.jpgWoodRiver block plane flatness toward heel post 30 micron.jpg
    Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.

  6. #20
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    Quote Originally Posted by planemaker View Post
    2500 strokes on 30 micron lapping compound to flatten the sole of a small block plane. Me smells an engineers foolhardiness in trying to prove a point.

    Stewie;
    Well, if it keeps him off the streets...

  7. #21
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    Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.

  8. #22
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    Quote Originally Posted by planemaker View Post
    For those unaware of the grit size equivalent of 30 micron; https://www.gessweincanada.com/category-s/11328.htm
    Why the criticism, you are not doing it.
    CHRIS

  9. #23
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    Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.

  10. #24
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    Is this going to get an engine turned finish at the end?

  11. #25
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    Quote Originally Posted by planemaker View Post
    2500 strokes on 30 micron lapping compound to flatten the sole of a small block plane. Me smells an engineers foolhardiness in trying to prove a point.

    Stewie;
    Kind of like pointing people toward very expensive pure chromium oxide paste, wouldn't you say? Paste that's intended for razors, when the wax sticks sold for $6-$8 are fine if you just use them sparingly and apply them with a little bit of oil.

  12. #26
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    Quote Originally Posted by D.W. View Post
    Is this going to get an engine turned finish at the end?
    Of course not, doing that would ruin the flatness. I plan to take it to the shiny stage, around 6 microns unless it becomes clear I should do something else.
    Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.

  13. #27
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    It might be "sticky" on end grain if it's completely polished.

    One of the reasons I ditched premium planes is that their surface finish is so fine that they need to be waxed more regularly. When I refinish a sole of a plane, I (keep in mind, I'm more of a user with old planes, and not a person who addresses cosmetics - the latter generally chases a finish to a higher level) use PSA roll and as the roll is breaking in, I finish the bottom and stop there. Fresh PSA 80 is a bit brisk and too toothy, but all paper loses its snot pretty quickly under high pressure and low speed (on machines, it never gets abused as badly as it does with a dude leaning on a plane and smashing the abrasive at low speed).

    Beyond that, I like the surface finish less because of friction. I don't like corrugated planes, either, so not going that far. Any burrs on a "worn out 80 grit finish" get removed with a light hand (finger) sanding of high grit paper of some sort, but not enough to do anything other than knock burrs off.

    If you get a nice long flat end of a panel and plane it with a super finished plane, you'll find it can really have some grip. Keep the wax handy.

    Super fine surface finish looks great, though.

  14. #28
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    I'm interested in what you come up with, by the way. I was patting myself on the back when I couldn't get a good quality 1 1/2 thousandth feeler under a starrett straight edge on a 9 inch smoother, but there is no way I was within a quarter thou over 3" spans.

    I have used the plane that I did that treatment to for quite some time now and I have to admit that as a smoother, it is slightly nicer to use than it would otherwise be, but once I'm sweating, I probably don't notice a difference.

    Planes with weight and extreme flatness go over well at wood shows, though - even saying those two things "it's heavy and super flat" gives a new user the idea that somehow the lack of weight in older planes is a quality issue.

    No clue how flat the infills (pre-war) were when they were new, but several that I've flattened have needed very little despite at least decades of disuse. That, I thought, was kind of unusual. Later cast norris planes haven't necessarily fared so well (A5s in my case). The A5 is probably the plane (with adjuster) that most people think of when they think norris, but between the instability and the horrid adjuster, it is by far my least favorite. And they're cast steel as far as I can tell, so when they're out of flat, they are really resistant to abrasion on a paper lap. Ugh. Cast iron files away nicely with abrasive - mild steel...well, filing needs to be with a file.

  15. #29
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    More to do here but this is the data as it stands.
    Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.

  16. #30
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    The issue of how much to polish comes up regularly. Where I live, it's a non-issue because I use my planes on all-comers & we have some very abrasive woods - a polished finish would soon become scratch city on any plane of mine. I spent hours polishing the sole of the first D/T plane I built. A couple of months later, it looked like it was finished on 180 grit, so that's where I usually stop, now.

    I've always been in the habit of swiping my plane soles with a block of parrafin wax before & during use. It's mandatory when planing several species I use regularly, like Forest She-oak, which is 'gummy' & quadruples the work if you don't keep your planes well lubricated.

    Anyone interested in extreme sole-flattening might like to browse this old thread, from another person who had access to very sophisticated measuring gear.

    Cheers,
    IW

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