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Discussion in 'CAM' started by sharmstr, Jul 8, 2019.
Hey Guys. What's a good starting point for tabs in hardwood?
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?
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.
start with 50% of material thickness and 3 x bitdiameter wide
Will give that a go. Thank you.