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| A1-4 lathe chuck |
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| Swarfing:
Hi guys it has come to a point where i need to make a backplate for a 200mm 4 jaw chuck. The question is do i or shall i just machine the back of the chuck? i know it ill be an expensive cock up if it all goes wrong but what would you do? The only way i can handle the material for the back plate is the existing 160mm 3 jaw. whats your thoughts? Paul |
| bambuko:
Have you got a faceplate? or is 3 jaw your truly only option? In which case you could try something like this ::): Chris ps I think I got this photo originally from John Stevenson's web page? |
| maybecnc:
A faceplate would be the best, but it also works with your 3 jaw chuck. Make a drawbar like the ones on the bottom of this page: http://www.toolsandmods.com/lathe-drawbars.html For your lathe make it from larger stock. Then drill a hole on the center of the piece you will work on for the drawbar to pass through. External jaws on chuck work better. Close the chuck jaws until it tights the drawbar. Don't worry if external jaws don't hold the drawbar truly centered. Turn the front register (oversized to finish later) and then you can reverse it and hold it directly on the chuck. Jose |
| bambuko:
Another alternative would be, to take another disc of metal (small enough dia to fit in your 3 jaw chuck), bolt it the bigger (backplate) disc and use it to hold your backplate for the first op. Make sure the bolt holes are where it will not matter later. Chris |
| Swarfing:
Great ideas and the face plate is what has been at he front of my mind. I do not have one so attaching to the 3 jaw could be the option, issue there is no outside jaws :-( Something else for the shopping list i suppose? what makes it awkward is the stepped nose. fixing in the middle means i can not machine the centre of the back side but now i have some ideas i will see what i come up with and post the solution back here. thanks guys |
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