MULTUSB200
Plastic
- Joined
- Feb 13, 2016
Hello friends,
I wanted to share two ways of gripping dovetailed stock in a power chuck;
I do the programming and setup on two multusb200 machines and started doing so about 3 years ago with practically no prior turning/using a lathe experience, and had a few parts fly out of the chuck.
Also there have been times where the I milled parts on the multus and had them vibrate a bit and start to come out/rotate slightly of the chuck jaws (hardened serrated jaws)...
It led me to search for solutions mainly on the internet and the first solution is;
turn the stock to a taper of 3 degrees (and the chuck jaws as well) and this serves well and enables counteracts the pulling forces that try to pry the material from the chuck, but do not provide a safe method to counteract rotating in the chuck due to agressive milling.
the second solution I came up with recently comprises of three 60 degree dovetailes - protruding about 3mm and equally spaced to 120 degrees apart.
this method of workholding provides a number of advantages :
1. counteracting rotating in the chuck due to agressive milling
2. stock preparation of dovetails can be preformed on a 3 axis mill
3. less stock is needed when compared to other methods.
4. part can be rough machined - stress relieved in a heat treatment process and go back for final machining.
5. part can be transfered to the subspindle automatically when compared to gripping the stock with a 5 axis vise and in case of needed part transfer - manual unclamping must be done and cause serious setbacks. (a solution Ive considered but abandoned eventually.)
I guess there might not be anything new here for some of you, but I havn't seen such a solution online and I would love to hear/see your thoughts and workholding solutions.
I wanted to share two ways of gripping dovetailed stock in a power chuck;
I do the programming and setup on two multusb200 machines and started doing so about 3 years ago with practically no prior turning/using a lathe experience, and had a few parts fly out of the chuck.
Also there have been times where the I milled parts on the multus and had them vibrate a bit and start to come out/rotate slightly of the chuck jaws (hardened serrated jaws)...
It led me to search for solutions mainly on the internet and the first solution is;
turn the stock to a taper of 3 degrees (and the chuck jaws as well) and this serves well and enables counteracts the pulling forces that try to pry the material from the chuck, but do not provide a safe method to counteract rotating in the chuck due to agressive milling.
the second solution I came up with recently comprises of three 60 degree dovetailes - protruding about 3mm and equally spaced to 120 degrees apart.
this method of workholding provides a number of advantages :
1. counteracting rotating in the chuck due to agressive milling
2. stock preparation of dovetails can be preformed on a 3 axis mill
3. less stock is needed when compared to other methods.
4. part can be rough machined - stress relieved in a heat treatment process and go back for final machining.
5. part can be transfered to the subspindle automatically when compared to gripping the stock with a 5 axis vise and in case of needed part transfer - manual unclamping must be done and cause serious setbacks. (a solution Ive considered but abandoned eventually.)
I guess there might not be anything new here for some of you, but I havn't seen such a solution online and I would love to hear/see your thoughts and workholding solutions.