Bended ballscrews. What i can do?

[ba99297]

Hi everybody
Yesterday i receive from Chai the above things

2X anti backlash ballscrews RM 2010 C7 end machined -1603mm Overall length 2 ballnuts for 2010 ballscrews
1X anti backlash ballscrews RM 2010 C7 end machined -1153mm Overall length 1X anti backlash ballscrews RM1605 C7 end machined -501mm Overall length 1 ballnut for 1605 ballscrew
3 Set of BK/BF15
1 Set of BK/BF12
1x Ball Nut Mount/Bracket Flange For 1605
3XBall Nut Mount/Bracket Flange For 2010

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I open the box to see if everything is ok
I attach the bf/bk at the ballscrews, and i realize that the screws seems to be bended
I give them motion with a wireless drill and they are "dancing" like crazy especially one of the 2010 1603mm long ballscrew. It seems to move 4-5mm out of the center axis. Also the other three are whipping(1-2mm).

Here are the videos that i capture
The worst one is at video #1 bended ballscrew 1603mm long - YouTube
At the following videos 0-4 the ballscrew is rotating with the help of a cordless drill and the bf/bk fixed on a C shape beam
At the Videos 5-7 i rotate the ballscrew with my hand.

0 bended ballscrew 1101mm long - YouTube
1 bended ballscrew 1603mm long - YouTube
http://youtu.be/TWbHcTfAPws
3 bended ballscrew 1101mm long - YouTube
4 bended ballscrew 500 mm long - YouTube
5 bended ballscrew 1101mm long - YouTube
6 bended ballscrew 1603mm long - YouTube
7 bended ballscrew 1603mm long - YouTube



My questions are
1. Is this bend so bad that make the ballscrews useless
2. Is there any way to correct the bend
3. What should i expect from Chai?
a.To refund me the money?
b. send other ballscrews with no cost?
c. Something else?
4. If i put that screw to my machine should i have resonanse or bearing ware problems?
5. Did anybody had such problem with Chai? if yes what Chai did ?


Thanks
Vagelis