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RDG Ball-turning attachment

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Allen Smithee:
I was browsing through some pages looking for cheap stuff people can give me for xmas presents when I came across this item. I know that there are many similar ones, and they can be a bit naff and tricky to get to work well, but it fills the bill of finding something I may actually want (rather than something someone else wants to give me that just clutters upo the house).

But looking at it I'm a bit mystified:



One of its features is that it has a graduated scale that could be more than sufficient for non-precision work and the scale is double-ended implying that it could be used for both convex and concave cutting. But as far as I can see the geometry of the vertically-supported insert (which probably makes it reasonably stiff) surely prevents cutting internal concave surfaces? Is this feature to allow cutting a radiused fillet or something?

AS

Jasonb:
Not unlike my homemade one. Pictute looks like a neutral TNMT insert where mine uses a TCMT or TCGT with 7deg side clearance. You could probably fit either. Mine works well for concave jobs as well as the usual convex.

uuu:
I've used one of those at the PumpHouse.  A challenge is that the base can foul the chuck jaws if you want to turn anything close up.  So putting a ball end on a handrail stanchion, for example, has too much material sticking out, and it bends.   So for small diameters we put a small secondary chuck on an arbour, e.g. a drill chuck, into the main chuck and this provides more support.

I'm attracted to the ball turners that use a vertically pivoting frame, but I've not tried one.  Like this: https://www.ebay.co.uk/itm/357556237346

Wilf

Jasonb:
For small balls like handrails, acorn nuts and decorative beads you are better off just making a form tool out of gauge plate or silver steel.

Sanjay F:
I'd like to know how to make the tools shown on the last 3 images especially the 1st one;the result looks great!  :ThumbsUp:

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