Re: [CAD_CAM_EDM_DRO] Ball Nut Thread Size

This isn't a stupid question !

Nook manufactures the McMaster Carr ball nuts. They don't sell a tap.
They told me to do single point threading on a mill to make the
threads. Lacking a CNC mill (we are doing the retrofit now), we used
1-3/16 x 18 TPI purchased from KBC.

The ball nuts fit loose in that thread, but if you tighten the nut
against the body it tightens up. Furthermore, we ground a flat spot on
the nut and used a set screw to hold it firm if it couldn't be adjusted
against the body.

Our axes are all zero backlash, so we've got 2 nuts on every screw. We
orientate the setscrew the same on the main nut and the backlash nut.

Kim

On Wed, 2003-07-23 at 19:26, amoss70 wrote:
> I'm looking to get some ball nuts from MCMaster and it lists a thread
> size of 1.173 - 18, the manufacturer lists 1.173 - 18 NS -3A. I
> wandered through Machinery 26 and through the KBC tools catalog and
> can find things that might work but nothing listed that way.
>
> The gueses I came up with are:
>
> UNEF 1 3/16 18tpi
> Metric 30 x 1.5
>
> but it feels very wierd just guessing like this.
>
> Any help?
>
>
>
>
>
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Kim Lux <lux@...>