I WOULD LIKE TO DESIGN A SPUR GEAR /WORM GEAR FOR DRIVING A 25 KG CHUCK THROUGH A 120MM THREADED STROKE LENGTH.THE LIMITATIONS ARE

1.THE GEAR SHOULD BE A SPLIT GEAR IE MADE OF 2 DIAMETRICAL HALVES

2THE ADDENDUM CIRCLE SHOULD NOT EXCEED 250MM INTERNAL DIA IS 200MM

 3 THE OUTPUT SPEED SHOULD BE 10 TO 15 RPM