Arter A-1-12 Spindle Repair

The Arter A-1-12 is a rotary surface grinder equipped with a horizontally mounted, pulley-driven spindle that operates at up to 1,500 rpm with grease lubrication.

CHALLENGE

The front end of this Arter spindle was extremely corroded with rust when it arrived to NTE. All of the front housing cover screws had to be drilled out. When the front cover was removed, several screw holes were damaged, including a previously installed helicoil insert. During disassembly, our technician discovered that the front roller bearing was heavily contaminated with rust and particulate. Grease in rear bearing pair was found to be relatively clean but the bearings felt rough when rotated by hand. The wheel hub and pulley OD tapers were rusted and measured with high runout of 6µm and 4µm, respectively. No other significant dimensional deviations were noted on any critical dimensions (bearing journals/shoulders, housing bores).

SOLUTION

The following actions were performed for this Arter A-1-12 spindle repair:

• Thorough cleaning of all parts
• Reworked the front cover and the face of the housing to create a new assembly screw pattern
• Kiss grind the wheel hub and pulley OD tapers
• Replace all bearings and assembly screws

RESULT

After adjusting bearing preload, reassembly of all components, and undergoing break-in and testing procedures, this spindle passed our final quality inspection before being returned to our customer with a 1-year warranty.