| Gallery, Projects and General > How do I?? |
| Elliptical path on wheel rim? |
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| JohnC:
[embed=425,349]<iframe width="480" height="360" src="http://s1094.photobucket.com/user/JCphotob/embed/slideshow/"></iframe>/embed] Sorry, best I can do for now is a link to photobucket! John |
| John Hill:
Fergus, ornamental turning is interesting and, I think, uses a sliding spindle so I will have to think about that some more! We have one of the world's best collections of Holzapffel and other OT lathes in our town and maybe I should pay that museum another visit! Thanks. JohnC, I have tried to avoid anything that tilts the wheel for cutting the groove as that will complicate things when I try to put a follower in the groove later but I might have to resort to that method eventually! Thanks. |
| BillTodd:
traditionally techniques such as a dividing head gear coupled with the milling table can produce simple cams and spirals. To produce your cam , I'd suggest drawing or printing the shape as a graph with displacement against angle . you can then either wrap the print around the part and carefully follow the path, or use the coordinates with a dividing head and dro. if you want just a simple ellipse, you could cut a suitable piece of tube at an angle then use the cut face as a guide. |
| John Hill:
Thanks Bill but how to handle backlash when the table changes direction? :scratch: I have been wondering if there is any established technique that moves the lathe top slide back and forth (that is with the top slide turned parallel to the spindle)? |
| BillTodd:
backlash isn't too much of a problem if stepping and plunging on a mill. you might be able to turn the groove , albeit slowly , if you mounted the cut tube on an arbour with the work piece and arranged a spring loaded cam follower on the topslide (you would have to remove the leadscrew) you may find inspiration if you look at spiral oil groove cutting techniques on the web :) |
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