Segments calculations

Discussion in 'Segmented Turnings Forum' started by Svassa, Dec 8, 2015.

  1. Svassa

    Svassa New Member

    Do you use some software for it?

    I'd like some that uses the metric system as thats what I work with here in Sweden.

    Inner/outer diameter and so on.

    I use trial and error now. Cut one piece, and draw around it on a piece of paper to see how big it would be if completed.
     
  2. stuart johnson

    stuart johnson Super Moderator Staff Member

    The software does give the ability to use metric under the option feature. FWIW, I have just started using metric because it is much easier to set up my jigs and tablesaw. The only problem (solved with a bit in internet shopping) was finding metric only tape measures and rulers. Whether using imperial or metric I don't like the dual ones.
     
  3. Svassa

    Svassa New Member

    Got the url for the software, or is it web-based?
     
  4. stuart johnson

    stuart johnson Super Moderator Staff Member

  5. OscarPhilips

    OscarPhilips PRO Member

    I have historically used graph paper, including some custom graph paper I created just for the process. Now that my PC is working I will try to write up the process and post it for others. I found it was a great way to learn what the software (like Woodturner Pro) is doing.

     
  6. David Creed

    David Creed New Member

    Hi Svassa, i dont use software but i draw out my project in a full size half view, then step off vertically using whatever wood thickness i am using, then i use thin ply cut into pie shapes using a 10" protractor and mark off the angles for how many segments are needed, its then an easy job to see what your segment lengths are etc, its harder to describe than do, cheers Dave NE
     
  7. Bob Beaupre

    Bob Beaupre Super Moderator Staff Member

    Woodturner Pro can switch between US imperial and metric with the push of a button
     
  8. mfisher

    mfisher Super Moderator Staff Member

    As Bob B said, WTP can be set for metric.

    Start WTP.
    Go to File , Options.
    The Option window will pop open.
    Select in the "Numeric Display" the measurement output you want by clicking on the button circle next to.
    Imperial decimal inch, nearest 1/64th, nearest , nearest 1/32th, nearest 1/16th, or Metric decimal millimeters.
     
  9. Philip DeCarlo

    Philip DeCarlo Pro Member - www.moonglowfinewoodcrafts.com

    Help! I just finished cutting 480 pieces for a bowl I'm working on. All rings are 32 pieces (using the correct wedge) First couple of ring perfect, however, for some odd reason, the third ring is off. If I remove two pieces, the ring closes nicely. What did I do wrong? I double checked the angle with the wedgie again, thinking it moved on me, however, it was still spot on. I'm thinking possible dust built up between the wedgie and the blank while cutting? Anyone know what could have doused this?
     
  10. mfisher

    mfisher Super Moderator Staff Member

    If the first two rings were spot on, and the fences didn't move. My guess is
    - As you stated dust build up.
    - possible the stock sides were not perfectly parallel. That is, did the stock you were cutting the segments have a tapper?
    - the stock was warped not allowing full contact along the fences. or due to dust build up.

    Did you try cutting them again using a different piece of stock? If so, how did they come out?

    Even with the wedge sled, you could build half rings, then touch up the two halves on a disc sander to square them up. This is not bad to do if the gap between the two halves is not large.
     
  11. Lloyd Johnson

    Lloyd Johnson Administrator Staff Member

    Another likely candidate is the stop. When you slide the wood against the stop, if it is not locked firmly in place, it can move and if it moves just a 10th of an inch, you will have a gap, even though the angles are cut perfectly.

    Unfortunately, this is a bit like the golf book '97 things to remember on your downswing'. There's just a lot of variables in cutting segments and if any one is off, the entire ring is golf's equivalent to a duck hook.
     
  12. stuart johnson

    stuart johnson Super Moderator Staff Member

    A small tip on stops. Cut them so the edge is long grain not end grain. The end grain from the segment can cause just a bit of drag against an end grain stop and screw it a tad.
     
    Bob Beaupre likes this.
  13. mfisher

    mfisher Super Moderator Staff Member

    another tip on stops.

    place a threaded insert in the stop. Then insert a bolt that has had the head ground smooth. you can make micro adjustments by turning the bolt in or out to decrease or increase the stops length.
     
    Chris Neilan and Bob Beaupre like this.
  14. Bob Beaupre

    Bob Beaupre Super Moderator Staff Member

    Good tips guys
     
  15. Chris Neilan

    Chris Neilan PRO Member

    Could you post a photo of that setup? Trying to see how that would work with my stop. I'm using the stop from the segeasy site (i think). A micro adjust would be very helpful.
     
    Last edited: Mar 26, 2017
  16. Bob Beaupre

    Bob Beaupre Super Moderator Staff Member

    IMG_20161129_110325226_HDR.jpg Chris this is what I did to my saw stop

    IMG_20161129_110325226_HDR.jpg
     
  17. Chris Neilan

    Chris Neilan PRO Member

    Thanks Bob, very helpful!
     
  18. Paul Williams

    Paul Williams PRO Member

    Question on how to measure segment edge length. Do you measure the stop at 90 degrees to the blade or at the cut angle?
     
  19. mfisher

    mfisher Super Moderator Staff Member

    cut angle.
     
  20. Paul Williams

    Paul Williams PRO Member

Share This Page