Spheres by Coordinates

[John PurdyParticipant @johnpurdy78347]

I need to turn a large radius curve on a length of mild steel round. There have been a number of articles on generating spherical surfaces using coordinates in the model engineering press, but I have not been able to find them no matter what key words I use in the various indexes. Can any one help me.

John Purdy

[John PurdyParticipant @johnpurdy78347]

[John McNamaraParticipant @johnmcnamara74883]

Hi John

Will this help?

**LINK**

I used Google search on….

machine a radius by coordinates

Regards
John

[JasonBModerator @jasonb]

Do you have a CAD drawing program? easy enough using that. Just draw your curve and then add a series of evenly spaced lines that meet the curve and use the lengths of the lines to move the cross slide, carrage or topslide moves by the line spacing.

Bit like this

Which was used to do this

Also works of more complex shapes

[mark costello 1Participant @markcostello1]

Is there anything available for the hopelessly computer dense? Math just "does not compute," for some of Us.

[JasonBModerator @jasonb]

Try the second one down on Marv's site "Ballcut"

[pgk pgkParticipant @pgkpgk17461]

I drew the shape out on simple graph paper (downloaded and printed free from some website I found via google) and used the DRO numbers from that for the shape below..finished with filing. The same approach would work for a ball end.

[Chris Evans 6Participant @chrisevans6]

Before CNC came in I spent my working life as a Die Miller/Spark Erosion machinist in the mould industry. Creating shapes from calculated sizes was an everyday thing. Sometimes to check my calculations I would draw the item out at 10 to 1 and measure it with a rule.

[Clive HaynesParticipant @clivehaynes74488]

Where I worked as an apprentice we had a profile grinder that had a table for placing a drawing and some parallel arms(much like an engraver) linked to a eye viewer and a shadow screen, as you moved the pointer on the arms to different points on the drawing, you could then grind down to the cross hairs in the viewers by moving x and y handles of the fixture holding the tool. That's how we used to make profile lathe tools for the production/machine shop in the sixties.

How things have changed.

Clive

[Martin ConnellyParticipant @martinconnelly55370]

One of the pieces of software on Mary's site is one I wrote.

Martin

[John PurdyParticipant @johnpurdy78347]

John

I've tried the Ballcut programme on Marv's site as it looked like it would give me what I want but I can't open the output file. Windows says " can't open file as I don't know which program made it" or words to that effect. I've tried opening it with the Ballcut programme but all it does is restart the programme.

John

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