Re: rolled ball screws

Hi Les,

This thread was started after I had a chat with a knowledgeable rep at
Roton. He said they will preload the ball nut to any "tightness" the
customer wanted. He faxed a written quote within one hour of the
conversation with prices well below what you were quoted for HIWIN
components.

I had never heard of preloading ball nuts this way and wanted to get
an objective opinion.

Previously, I had discussed the preloading option with a tech rep at
THK. This is the same way they preload their LM guides. Unless I
misunderstood, preloading increases the life of the guide and is the
difference between Standard and Precision LM guides.

Regards

Steve

> Hi Carlos
>
> Well my price might not be the same as others as I am
> a business. Last quote for a 2.5 meter x25mm x 5tpi
> was well under $500. I think it was $425.
> this yields two 49 inch screws each with a preloaded
> nut after cutting for $212 each. Not bad. Of course
> you can make the cut anywhere, like a longer piece
> for an x or y and a short one for z.
>
> I understand they shipped them over this way for Bridgeport-
> one of their main customers (but not any more?)
>
> You might ask Bob Campbell- isn't he selling HIWIN now?
>
> Les
>
> Leslie Watts
> L M Watts Furniture
> Tiger, Georgia USA
> http://www.alltel.net/~leswatts/wattsfurniturewp.html
> engineering page:
> http://www.alltel.net/~leswatts/shop.html
> Surplus cnc for sale:
> http://www.alltel.net/~leswatts/forsale.html