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Tab shape and size

Discussion in 'CAM' started by sharmstr, Jul 8, 2019.

  1. sharmstr

    sharmstr Veteran
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    Hey Guys. What's a good starting point for tabs in hardwood?
     
  2. David the swarfer

    David the swarfer OpenBuilds Team
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    SketchUcam has 2 tab shapes. One is square edged, a straight up and down Z movement. This is strongest of course but also takes longer since X/Y have to stop so Z can move. However thickness is easy to set and even a relatively thin tab (thin in Z) but long in X/Y will be strong enough for most finishing cuts.
    The second type is the V tab. The tab is actually an upside down V. This means that X/Y do not have to stop and the path is uninterrupted as Z lifts and descends while X/Y moves. Here you have to be a lot more careful of depth and length since they get weak quickly as they get thinner. But the cut time is greatly reduced.

    If you drag a V tab along several segments of a circle you get a trapezoidal shape. This is faster than a regular tab, slower than a real V tab, and you have to be careful that the slopes are not too steep for your feedrate.

    What other shapes have you seen?
     
  3. sharmstr

    sharmstr Veteran
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    I'm using fusion and you have the option for rectangle or triangular (probably what you refer to as upside down V). I tried some the other day using rectangular (1/4" wide x 1/8 tall). It seemed overkill and you are right, I dont like the way it cut. I want to go the triangular route, but not sure how big to make them.
     
  4. David the swarfer

    David the swarfer OpenBuilds Team
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    start with 50% of material thickness and 3 x bitdiameter wide
     
  5. sharmstr

    sharmstr Veteran
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