Re: Ball Nut Thread Size

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Kim Lux <lux@d...> wrote:

> 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

I was faced with the same problem. very odd thread size. I made a
mounting plate on the lathe and chased the threads, then bolted the
unit on my machine.

outta-be-a-law that if you sell a thread, you gotta sell a tap.


Dave