Spindle surges on tool breakthrough

Probable Cause



Air in hydraulic system. Check for leaks. Reseal leaking area or return to factory for repair.
Air input pressure too low. Air pressure should be above 50 psi. Regulate per Eng. Data. Bul.
Thrust required to advance tool at desired feed rate approaches or exceeds thrust developed by air cylinder. Consult drilling speed, feed and thrust charts and compare with developed thrust of unit. Decrease feed rate. Increase input air pressure. Stagger drill lengths. Decrease size or number of tools. Substitute with hydraulic powered holomatic unit.
Plunger assembly allows air to enter hydraulic system. Remove and inspect seal and/or plunger. Replace - Ref. Manifold Assy. Bul.