Great CNC Related Articles: Formulas

  • countersink

    Countersink Formulas

    Posted April 11, 2012 By admin

    82deg countersink 1.74 x T = y 90deg countersink 2.0 x T = y 100deg countersink 2.38 x T = y 120deg countersink 3.46 x T = Y T = Metal thickness (depth of countersink) y1 = Amount to add to punched hole to give countersink size or y2 = Amount to subtract from countersink…continue reading

  • Backdrive Torque Formula

    Posted July 15, 2011 By admin

    The formula to calculate back driving torque is: Td=(P*L*e)/(2*PI)=.143 P*L Where: Td = Drive Torque (pound-inches) P = Load (lbs.) L = Screw Lead (inches/turn) e = Ball Bearing Screw Efficiency (90%) PI=3.1415926535897932

  • Calculating Chip Load

    Posted June 21, 2011 By admin

    Feed Rate Calculations-The feed rate in inches per tooth must be converted into feed rate in inches per minute (IPM) before you can make the feed rate setting on the machine. The formula for converting feed rate in inches per tooth into inches per minute is as follows: Feed Rate (in./min.) = RPM x Chip…continue reading