Problems with deep hole drilling

Hello,

I was wondering if anyone has used a techni drill deep hole drilling machine? I have been having issues with drilling a 29mm hole 120inches deep, it's moving off center very bad in a 5 inch diameter bar. Any help would be appreciated

Please help.

Thanks

I didn't find the right solution from the Internet.



References:

www.practicalmachinist.com/vb/general/problems-deep-hole-drilling-305307/

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