RE: [CAD_CAM_EDM_DRO] McMaster ballscrews

I can't explain the why of the pricing other than to guess that it has to do
with production quantities.

I am using the 5/8" shaft on my Shoptask and on another project. The nuts
have no preload as they are single nuts, but if you buy 2 per axis you can
easily make your own preloaded nuts. The screws are actually Thompson
Saginaw and with a single nut will have .005 - .009" or so of backlash.

Tim
[Denver, CO]

> Greetings to you all;
>
> Thumbing through the McMaster catalog I noticed some weird
> pricing on their
> ballscrew assemblies. For instance -
>
> 1/2" screw at $2.21 per inch. The nut is $129.26.
>
> 5/8" screw at $1.02 per inch. The nut is $19.50.
>
> 3/4" screw is $1.68 per inch in .25" and .5" lead, but the .25"
> lead nut is
> $34.57 whereas the .5" lead nut is $131.31.
>
> What gives?
>
> Also, has anyone used these screws? The catalog doesn't say what level of
> preload, if any.
>
> Doug Harrison
> FAQ: http://www.ktmarketing.com/faq.html