Scratch a line a tenth or two deep and parallel to the turret axis with a turning tool using an appropriate turning tool.When working with difficult plastics, try turning off the constant cutting speed. Having manual control over the cutting speed can help you keep the stringy chips under control. It is possible to increase the chip load by slowing down the spindle or increasing the feed rate in order to thicken the chips.When it comes to using a CNC lathe power chuck, setting the fine serration top jaws can be difficult. Apart from that, it's a challenge to measure three jaws and set them to the middle of their range of movement. Using a mill, it only cost $5 and a small amount of time. Please make certainlathe cutting tools the area of the jaws where the labels adhere has been thoroughly cleaned. Whenever you reinstall the top jaws, make  https://www.cnclathing.com/cnc-turning cnc lathing a habit to use a scratch brush to remove any fine jaw serrations that have accumulated.The use of a spindle linerlathe cutting tools is close in size to the raw stock size is preferable for bar pulling applications. A simple spindle liner is shown in the illustration.. For this reason, I turn the setup bar so that the end of the bar is facing me and darken the end with a marker. I scratch a line along the turret axis with a turning tool  https://www.cnclathing.com/cnc-turning cnc lathing is a tenth or two deep. On the turret, the X-axis angle is aligned with the center of this line, which is very accurate. In order to have something to line up the cutting edge with, I can twist the little boring bar around in my hand. I use a mirror so that I can see the tool from the bottom up in order to align it with the centerline{anchor} has been marked.When you have finished setting up and using a tool, do yourself a favor and record at least the X-axis offset on the storage tube or directly on the tool when you remove{anchor} from the lathe. The next time you use that tool, you will be able to set it up faster because of this setting. Even if the offset isn't perfect, it can be very close to being perfect.All of my external boring tools have a back stop screw{anchor} is butted up against the turret. If I remove the holder from the machine, I will be able to maintain an accurate X offset. This offset is retained during the next setup of that tool.A few welds complete an inexpensive spindle liner that was previously assembled. Because the tool is in the negative X quadrant, I enter the offset as a negative X value on my machine, which is the default. Take special note of whether the control will accept a negative value while still performing the offset math correctly. Accurately measuring the outside diameter (OD) is almost always easier than measuring the inside diameter (B).When bar pulling operations are performed, it is preferable to use a spindle liner that is close to the size of the raw stock being pulled from the machine. The next time you have a smaller-than-minimum cutting order, have the waterjet or laser cutter spit out a batch of disc blanks. Put them on a shelf, and the next time you need a special liner diameter, you'll already have half of the work done for you! Using a piece of tube, weld the discs in place. (Optional.)Two quick welds later, and you've got a low-cost spindle liner for whatever oddball size you happen to be running on the machine.