Mill Ball Screw XYZ Axes Retrofit Kit
When ordering your new Ball Screw Retrofit Kit, you will need to supply the following information for your current machine so we can ensure you receive the correct length of the ball screw for each axis:
The key upgrade parts for this ball screw retrofit kit include ball leadscrews, stepper motor high-torque coupling, and the ball screw mill saddle (with nickel / Teflon plate) for the X/Y-axes, and a ball leadscrew, stepper-motor coupling, vertical milling column saddle for ball screws, and column saddle Z-axis ball nut mount.
Ball Leadscrew Specifications
- Rolled Ball Screw with BSH Nut
- 10mm Diameter, 2mm Lead
- C7 Accuracy*, P1 Preload
*C7 accuracy has a linear tolerance of 50 micrometers / 300mm or .002″ / 12.0″.
- The charge for all ball leadscrews is the same, regardless of the overall length. This is because the manufacturer does not give us a price break on the shorter screws (in fact, they wanted more for a 6″ ball screw). All screws come in at 400mm (15.75mm) long, and we cut them to length to fit the individual machine axis.
- All retrofits come with the stepper-motor mounts, high-torque couplings, bearings, preload nut, and ball screw fully assembled in our factory. We do not sell these parts individually for you to assemble.
- The ball leadscrew and the rest of the assembly are assembled and checked in our factory. We place an O-ring on the end of the ball screw, below the saddle, away from the motor mount. The O-ring is placed there to help ensure that the ball nut does not thread itself off the ball screw. If the ball nut threads off the ball screw, the balls in the ball nut will come out. At this point, the ball screw is scrap. There is no way to fix it! For this reason, the O-ring is to remain on the ball screw until the ball screw assembly is fully assembled on your machine. After you have assembled your ball screw on your machine, you may remove the O-ring.
NOTE: On retrofits, the only way possible for your ball leadscrew to have excessive slop (backlash), is if some of the balls have come out of the ball nut. We will not replace ball leadscrews that have excessive slop (backlash)!
Regarding the Hole Modification through the Mill Column Base
For all mill retrofits, you must drill a ½” hole through your column base. This is a clearance hole for the brass cover tube to go through the column base. On page 5 of the instructions, there are copies of the prints for both the standard column base and the rigid and 2000 column bases.
If you would like us to do the machining, the cost will be $60.00 plus your return shipping. You will need to select this option from the drop-down above, and we will provide information on how to send your column base back once we receive your order.
You can also purchase a new column base with the ½” hole already drilled. The base for our 5000/5400 series mills is part number 50054, part number 56714 for the 2000 series mills, and part number 50055 or 50056 for the rigid column bases.
Always wear safety glasses when operating machine tools.
Retrofitting a Sherline Mill with an X/Y-Axis Ball Screw Saddle
Aligning the Ball Nut to the Stepper Motor
Retrofitting a Sherline Mill with a Z-Axis Ball Screw Column
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Most merchandise can be returned within 30 day of the purchase date. A refund will be issued to the original form of payment at the original selling price. View our complete return policy and/or start your return online here.