That was an excellent explanation, I really enjoyed learning about parasitic motion and the compliant mechanism used to defeat it in this scenario. Thanks for sharing, I'm gonna be watching a lot of your other videos from now :)
It looks like micrometer with ball at the end of the shaft preloaded with spring instead of grove and set screw will eliminate the need for the second horizontal stage. Ball will just slide horizontally on the surface of the center support.
If I could make a few suggestions. First, If you are looking for near absolute repeatability for toolpost location, add some (at least 2) dowel pins. It should get you within just a few tenths every time. Second, for your micrometer head, consider a surplus micrometer from an optical comparator. They are 2 to 3" in diameter and much easier to read and make painfully small adjustments quite easy.
Isn't a differential screw a better option here? (Titter beat me to this.) That micrometer thread isn't all that granular. I also think the flexure is trading off rigidity for the dubious return of this adjustability (the suggestion of shims below may not be as elegant, but it is certainly more rigid.) All the forces on that axis are on a single tiny micrometer screw, and all the cutaway for the flexure is less material for the other axis rigidity. Beautiful part, but I suspect ill conceived.
You would get finer resolution if you use a differential screw in stead of the micrometer. And it averages out so it can be made on a normal non-precision lathe.
Is there a concern that the small stage can move up and down by flexing it's connecting links toward or away from each other? They look like they could bend.
Good use of paper cutouts for demonstration
Wonder where that idea came from...
@@mkemachineinc.8058 idk I might’ve seen some guy on UA-cam do it before, his name escapes me tho… 😁😁
That was an excellent explanation, I really enjoyed learning about parasitic motion and the compliant mechanism used to defeat it in this scenario. Thanks for sharing, I'm gonna be watching a lot of your other videos from now :)
It looks like micrometer with ball at the end of the shaft preloaded with spring instead of grove and set screw will eliminate the need for the second horizontal stage. Ball will just slide horizontally on the surface of the center support.
Well explained and great props! I love the brilliant simplicity of flexures
If I could make a few suggestions.
First, If you are looking for near absolute repeatability for toolpost location, add some (at least 2) dowel pins. It should get you within just a few tenths every time.
Second, for your micrometer head, consider a surplus micrometer from an optical comparator. They are 2 to 3" in diameter and much easier to read and make painfully small adjustments quite easy.
Beautiful demonstration 👌
Isn't a differential screw a better option here? (Titter beat me to this.) That micrometer thread isn't all that granular. I also think the flexure is trading off rigidity for the dubious return of this adjustability (the suggestion of shims below may not be as elegant, but it is certainly more rigid.) All the forces on that axis are on a single tiny micrometer screw, and all the cutaway for the flexure is less material for the other axis rigidity. Beautiful part, but I suspect ill conceived.
You would get finer resolution if you use a differential screw in stead of the micrometer. And it averages out so it can be made on a normal non-precision lathe.
could you suggest an online site where the mathematics you references is explained, Thank you for the very clear explanation once again
Is the 3D model of the flexture available somewhere? I'd love to 3D print it and play around with it a bit!
Is there a concern that the small stage can move up and down by flexing it's connecting links toward or away from each other? They look like they could bend.
Fair point, the leafs might buckle depending on the vertical load
Love the paper demo. Did you use pins at the hinges?
yep, thanks kumar!
What material is the flexure made of?
Titanium
Do you consider titanium stiffness in design these flexure ?
Yes. Did all the math to determine web thickness for correct stiffnesses
Did you use water jet to cut the block?
WEDM