Acra 46SF, Instruction Manual, Page: 19 / 36

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(4) Lack of power with main spindle revolving:
(a) Motor has burned out - Change a new motor.
(b) Fuse has burned out - Replace with new one.
(5) Table travel has not balanced:
(a) The gap of spindle taper too wide - Adjust bolt in proper.
(b) Loosening of leaf bolt - Turn and fasten in place.
(c) Feed too deep -Decrease depth of feed.
(6) Shake of spindle and roughness of working surface has taken place during performance:
(a) The gap of spindle bearing too wide - Adjust the gap in proper or replace bearing with new one.
(b) Spindle loosening up and down - Make two of inner bearing covers on the top tight each other.
Do not over-tighten two inner bearing covers with the taper bearing; it is ok as long as no gap
between them.
(c) The gap of taper sliding locate too wide - Adjust the tension of bolt in proper.
(d) Loosening of chuck - Fasten chuck.
(e) Cutter is dull – Re-sharpen it.
(f) Work-piece has not hold firmly - Be sure to tighten work-piece.
(7) Micro feed does not work smoothly:
(a) Loosening of clutch - Be sure to tighten it.
(b) Worm and worm shaft has worried out - Replace with new one.
(c) Loosening of hand-wheel fixed screw - Be sure to tighten it.
(8) Without accuracy in performance:
(a) The balance of the work-piece - must be considerated as the principle balance while holding
work-piece.
(b) Often use of hammer to strike work-piece - Forbidden to use hammer to strike work-piece.
(c) Unaccurate horizontal table - Cheek and maintain table for keeping accurate horizontal after a
period of use.
(9) Excessive vibration:
(a) Motor out-of-balance. – Balance or replace problem motor.
(b) Bad motor. – Replace motor.
(10) Motor stalls:
(a) Over feeding - Reduce feed rate.
(b) Dull drill – Sharpen drill and keep sharp.
(c) Motor not building up to running speed. – Replace or repair motor. Check fuses in all three
legs on three phase motors and replace if necessary.
(d) Bad motor. – Replace motor.
(11) Noisy operation:
(a) Excessive vibration. – Check remedy under excessive vibration.
(b) Improper quill adjustment. – Adjust quill.