Bora4080

What happens in NK, stays in NK, because you ain't coming home alive.

Hey there, I was once researching ball screws for a project I was working on. I got a quote from Nook for a 1/4" ball screw, approx 20" long, ball screw and shaft was over a thousand dollars. I found a website which had the same type ball screw and shaft for like 20 dollars. Same specs. and everything. Am I loosing any quality or durability between the two? I asked the same question to my sales rep at Nook, never heard back from him.

Well Nook is a large bearing manufacturer not unlike SFK, Timken, and the like. Not sure of their actual quality. The project ultimately fell through so I didn't buy either bearings. Here are the cheap ones: http://buildyourcnc.com/CNCMachineMechanicalParts.aspx
The drawings sent to me from Nook were basically the same. The backlash bearing is what cost so much more from nook. However, even the cheap plastic nuts were like 100+ dollars. Now for a different project we got 1" screws with some crazy awesome accurate nuts for a grand total of about 800 per shaft manufactured by Thompson. Thompson, if you don't already know, makes a lot of hardened shafting, very good tolerances. Anyway, I kinda forgot where I was going with this. But I guess I was just wondering if you could an explanation of the despairity between the pricing of the two components.