Have a BT1337g it’s been a great lathe. Recently it’s been gaining an appreciable amount of taper to an astounding .150 thouthandths when I chuck a 5” 6061 1.5” round bar and dial it in to zero concentric. To add further clarification this isn’t a tailstock issue or a bed level issue. Bed is perfectly level front to back and lathe is fastened to the floor. Yes I reverified leveleling and it hasn’t changed in 6 months. The tailstock when used is aligned perfect and I can center a perfect hole in a part however whether I use the tailstock “or not” the part tapers. Majority of the time I don’t use a tailstock it gets in the way for the little parts I make. I’ve been talking to the manufacturer and they believe it’s the lead screw nut and cross slide gibs. I tightened the gibs to the point I could barely crank by hand to attempt ruling out issues and checked the bed for wear though were talking a 1 year old lathe with a hardened bed. Using a straight edge it is straight across showing now wear. So then I thought perhaps an issue with the gap bed and though I’ve never removed it I did have a fastener come lose recently and saw the manufacturer had short screws where the threads barely caught and the casting let loose so I removed the gap bed and cleaned it all up, paint removed, grease, etc.., cleaned to near new and reassembled with longer screws and the problem still exists. The saddle/carriage feels solid and tight physically when I grasp it but it’s obviously pulling away the closer it gets to the chuck. Spindle bearings are solid and no runout the machine is overall healthy. There is approx .015 play in the lead screw with the saddle locked down. I don’t see how that is going to give me .150 taper. The taper is back to back no matter which lathe chuck I use or how I set up the machine It duplicates itself precisely every time. When I used just the cross slide to cut instead of whole carriage I still got taper but it wasn’t as much. Does this sound like I’ve just worn out the gibs and lead nuts? I’m going to have the parts shipped 2 day air in the morning and see if they help but I’m a little Leary if it is going to fix the issue. If anyone else has ever had this occur that would be great to hear your experience. I do use the cross slide and carriage a lot and the lathe is used every day for the past year since new. It gets a good 2-3 hours a day use. Hopefully I’ve covered all questions you may have. Photos of taper attached. Thanks.