ARO Par-A-Matic Drills provide the selection, performance, and degree of precision to automate a wide range of secondary machining applications simply and economically. They utilize compressed air for both the spindle rotation and feed / control functions. The reliable rotary-vane air motor offers high power-to-size performance which minimizes tool size and weight for added machine design flexibility. The tools are easily installed, requiring only simple pneumatic circuitry. They can be used individually or in conjunction with other ARO electric and pneumatic tools.

Additional features / benefits include—

• Built-in four-way valve enables both manual and remote operation.
• Double-acting air piston provides smooth, controlled forward and retract strokes.
• Needle valve controls allows adjustment of forward and retract strokes.
• Adjustment screw provides infinite stroke length settings.
• Ball bearing spindle support offers precision and long service life.
• Muffled exhaust for a quieter work environment.

   

  SPECIFICATIONS

  MODEL NUMBER	8255-A28-2
  TOOL SERIES	Par-A-Matic
  STROKE LENGTHS
  	in.	2.0"
  	mm	51 mm
  FREE SPEED (rpm)	2,800
  NOMINAL DRILLING CAPACITIES
  	Stnls. Steel Type 304	1/16 (1.6)
  	Steel SAE 1213	9/64 (3.6)
  	Aluminum 2024-T4	1/4 (6.4)
  	Wood, Med. or FRP	1/4 (6.4)
  THRUST @90 PSI
  	lb.	170
  	N	756
  AIR CONSP.‡ @Working Speed
  	ft 3/cycle	2.3
  	L/cycle	65
  SOUND LEVEL dB(A)	74
  STD. CHUCK CAPACITY
  	in.	5/16
  	mm	79
  GEAR REDUCTION	Single
  AIR INLET	1/4" NPT male
  CONTROL PORTS	1/8" NPTF female
  SPINDLE THREAD	1/2"-20 male
  RECOMMENDED HOSE SIZE	5/16" ID
  RECOMMENDED OPERATING PRESSURE	90 PSI (6.2 bar)

   

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