Air Threading Acme-Gridley

Increase Productivity, Thread Quality and Tap Life

Year after year, lost production hours are attributed to mechanical threading clutches that are over or under adjusted on your Acme-Gridley screw machine - forcing you to compromise on part quality and tap life.

Now, you can achieve state-of-the-art tapping repeatability, reliability and quality with Logan Hi-Capacity Air Threading™Clutches. 

  • Logan Hi-Lo Retrokit for your 1/4 RA-6 Acme-Gridley Screw Machine
  • Threading Clutch Speed Direction Change Occurs Through Limit Switch in Tool Zone.
  • This Manufacturer of Stainless Steel Fittings Switched from Mechanical to Logan Due to Excessive Tap Failure From Mechanical Clutch Slippage. Tap Depth is Now Consistent Over Millions of Parts
  • Logan Air Pick-Off Drive Attachment for an 1/4 RA-6 Acme-Gridley Screw Machine
  • Logan Air Threading Clutch Attachment for an 1/4 RA-6 Acme-Gridley Screw Machine
  • Ideal Parts for Generation III Air Pick-Offs Logan Single and 2-Speed Stop and DropTM Pick-Off Drives.
  • Logan 1-Speed Pick-Off Drive and Brake for an 1/4 RA-6 Acme-Gridley
  • Typical View of Factory-Assembled Valve Manifold, Pressure Regulator, Hose and Fittings for Logan Kits. Kits Vary, Based on Machine
  • Acme-Gridley
  • View of a Logan Hi-Capacity Air Threading Logan Clutch in a 1-1/4 RA-6
  • Logan Air Pick-Off Drive Attachment for an 1/4 RA-6 Acme-Gridley Screw Machine
  • 1-1/4 RA-6 2-Speed Pick-Off Drive with Brake - Under Power.
  • CS2001XT16
  • View of 2-Speed Pick-off Drive with Brake on a 1-1/4 RA-6 Acme-Gridley
  • Single Speed Pick-off Drive with Brake for 1-1/4 RA-6 Acme-Gridley.
  • Logan 2-speed Pick-Off Drive and Brake for an 1/4 RA-6 Acme-Gridley
  • CS 2001 Microprocessor Control
  • CS 2001 Acme-Gridley
  • Threading RA-6 Acme-Gridley
  • Logan Hi-Lo Retrokit for Your Acme-Gridley.
  • Electrical/ Pneumatic Start-Up Kits  Start-Up Kit Includes Valve Assembly, Pressure Gauge, Pressure Regulator, Limit Switch, Quick Exhaust Valves, Fittings, Bracket, Hose and Schematics.


Air tapping assembly for AcmeLogan Hi Capacity Air Threading ClutchesEngagement and disengagement are so smooth and positive - Tap depth remains consistent over millions of parts. Also, the load on your tap is uniform, prolonging the life of the tap. Fewer tool changes are necessary, shaving valuable hours from a big job. Logan also provides up to 200% more torque for heavy-duty pipe thread tapping.

Logan Hi-Capacity Air Threading™ Clutches are simple to install and available for almost every Acme ever manufactured. Make the switch from mechanical to Logan!


Increase Productivity And Quality

  • Self-AdjustingTM Disc Pack - No Slippage.
  • Extremely Accurate - Uniform Thread Depth Over Millions of Parts.
  • Large Cylinder - Piston Area For Maximum Torque.
  • Up To 200% More Torque Than Mechanical Clutches.


Simple to Install

  • Most Logan Air Threading™ Clutches utilize existing clutch drive cups, (clutch gears), spacers and shafts.

Convenient To Maintain

  • Increase Tap Life Through Positive Clutch Engagement.
  • Eliminates Mechanical Linkages Lever Arms, Adjusting Collars, Dog Levers, Spring Pins, Yokes, Clutch Sleeves, etc.
  • Eliminates Mechanical Clutch Adjustment.

Threading clutch speed direction change occurs through limit switch in tool zone.

Logan stainless steel fittings

Cut-away view of a Logan Hi-Capacity Air Threading!22 Clutch for a 1-1/4 RA-6 Acme-Gridley. Utilizes existing drive cups, (clutch gears) and shaft. Fits within existing old-style mechanical clutch envelope and transmits 85% more torque.

Cut-away view of a Logan Hi-Capacity Air Threading™Clutch for a 1-1/4 RA-6 Acme-Gridley. Utilizes existing drive cups, (clutch gears) and shaft. Fits within existing old-style mechanical clutch envelope and transmits 85% more torque.

Additional Benefits

  • Direct Air Connection No linkages
  • Utilizes existing clutch gears in most cases
  • Gain speed and cycle time by running larger tapping jobs on smaller machines


Logan Hi-Capacity Air Threading™ Clutches

Logan Clutches: How They WorkLogan Hi Capacity Air Threading Clutches.

Pressurizing the cylinder forces the piston to clamp and lock the friction and steel separator discs. When pressure is removed, release springs separate the friction and separator discs and maintain a running clearance between separator and friction discs. The amount of pressure controls the amount of torque.

Speed Changes
Change of speed in threading applications is accomplished through a limit switch and a solenoid-activated, directional control valve. At the prescribed depth, the limit switch is tripped by the threading slide shaft, signaling the threading clutch to change speeds. Low speed for tapping - Fast speed to back the tap out. (Left-hand threading applications require the inverse sequence).

Since Logan Clutches operate at relatively high speeds, a steady metered flow of lubrication is required over the bearing and disc pack surfaces. Lube Ports are standard on majority of Threading Clutches to provide direct lubrication to clutch bearings.


Logan Air Threading™ for your Acme-Gridley

Electrical-Pneumatic Start-Up KitsAcme Gridley Electrical Pneumatic start up Kits

Each Logan electrical pneumatic start-up kit is designed to save you time and money during Installation. Kits are furnished with detailed schematics to simplify Installation.

Simple to Install

  • Easily retrofits with all types of early and late-model screw machines.
  • Field installation service is also available.

How to Order

Call Logan with the machine make and model. Provide part number and brand of clutch being replaced. If necessary, confirm bore, keyway, and axial length of duplex clutch assembly being replaced.


Logan Clutch and Brake Discs

Over 300 Different Types and Styles Available  (from 30 in /  762 mm  maximum  diameter)

In addition to our line of air/fluid actuated Clutches and Brakes, Logan manufactures and stocks a wide variety of friction-faced and high-carbon steel clutch discs for use in a variety of applications. Call our factory for details.


Longer Lasting Spindle Stopping Clutch Discs

Replacement Friction and Steel Clutch Discs for :
  • Twin Disc
  • Dana / Formsprag / T.B. Woods
  • Rockford
  • Carlyle Johnson and more
Applications Include:
  • Mechanical Threading Clutches
  • Spindle Stopping Clutches
  • Mechanical High Speed and Feed Clutches


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1506 Shuhai Road, Room 302, Building 4
Songjiang Disrict, Shanghai, China 201611
Phone: 01-186-216-408-1199
Email: Click Here

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