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RDG Ball-turning attachment

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Jasonb:
Drill a hole to the chosen size of your ball.

If using silver steel mill away half the diameter. Gauge plate has a flat top so nothing to do at th etop.

Tilt the plate/rod 5-7degrees in the vice and mill the end away so you have a half a hole with a bit of a clearance angle on teh tool.

Use a needle file to put similar clearance around the half hole stopping just short of filing the actual half circle.

heat to red heat and quench in water. Some people temper the tool but I tend to use them just hardened.

You can use a small oil stone or diamond lap to touch them up if needed.

The second image is actually a tool that was made for a 9/16" ball being reused with a bit of modification.

Here it is drilled and a cut out of the final profile used to mark it out for sawing and filing to shape.



In action



Nice swarf from the brass



Finished items

Sanjay F:
That's great, seems very straightforward the way you have described it, I'll give it a go; I have a project in mind where I need just such a tool  :ThumbsUp: ;D

jcge:
Jason you've achieved some great results there with the O1 tools - very nice!
Regards
John

Allen Smithee:
Thanks Jason - I've now added both the RDG one and the Hemmingway kit for a vertical-axis one to my Xmas list. I think the Hemmingway one will probably work better for most uses, but the horizontal-axis RDG one can cut "Ogive" cones (part arc) curves for things like spinner-nuts and radiused corners which the vertical axis one can't because it can be set with the pivot axis away from the lathe spindle axis - the vertical axis one essentially has the pivot axis nailed firmly to the lathe centreline.

We'll have to see what (if anything) santa delivers. I'm just hoping he doesn't use Evri...

AS

Jasonb:
As the Hemmingway one just mounts in the tool post you can raise and lower the axis just as you would to set a tool on Ctr height. Might need to get a bit inventive if it is offset a lot but just having some additional holes in the body so the clamping block can be positioned further up or down would cover most cases.

The best one I have seen for getting in close and leaving the ball on a very small stick is the one from Eccentric Engineering.

http://www.youtube.com/watch?v=Xs8XZ8X1I-g

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