310 - 340 mm (approx )
M8 1.25 mm pitch
Delrin (acetal )
35 mm x 13 mm x 31 mm
2 hole fixing
Virtually zero (adjustable)
These lead screw and anti-backlash nut block sets have been designed specifically for the CNC hobbyist in mind, to provide a low cost solution for providing linear motion when coupled with a stepper motor.
This particular item comprises of 2 sets of a 395 mm stainless steel lead screw with a matching anti-backlash delrin nut. The diameter is 8 mm with a standard M8 1.25 mm pitch.
This pitch is ideal for small hobby CNC machines, where large speeds are not required, as the fine pitch provides good precision whilst requiring minimal force from a stepper motor, and thus is suitable for direct drive with small stepper motors. Due to the high resolution (0.00625 mm per full step on a standard 1.8 degree motor) vibration is negligible and a simple drive can be used without micro-stepping, thus further reducing cost.
The lead screw is supplied polished and fitted with our anti-backlash delrin nut and has a standard 1.25 mm pitch. There is no machining on the ends but 8 mm bore bearings (such as 608) can easily be fitted to either end with standard 8 mm nuts.
The anti-backlash delrin nut is manufactured from grade A delrin (Acetal homoplymer B) supplied from a reputable European manufacturer. This material is extremely hard wearing, and normally does not require lubrication. A pre-set screw adjustment removes any backlash, and due to its mechanical properties there is minimum friction and wear.
The form of the nut is as a rectangular block with 2 mounting holes, and as such can be directly attached to the moving base, without need for brackets or additional items.
This item is shipped by registered international air mail