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Dunham CNC Lathe Bar Pullers

ROVI has made it easy to Order Dunham Bar Puller Kits & Parts Online
What does the bar puller do?

Rovi Distributes high quality lathe bar pullers and bar puller kits to enhance bar stock puller applications. These bar pullers are most frequently used as a CNC bar puller, but are also used in 'pick and place' applications. These tools are sometimes referred to as pull up bars.

Grippers for CNC lathes are available from 1/8" to 2" diameters (1/16" increments) as well as 2 1/4" & 2 1/2" sizes and mount directly to the Dunham bar pull shank or bar pull adapters.

The lightweight and self-activating bar puller has no moving parts, mounts in 60 seconds with gripper change in about 30 seconds, and does not interfere with other tools or cause turret imbalance. When a bar puller is used, the lathe turret no longer acts as a stock stop, reducing turret degradation and eliminating expensive, space-consuming, high maintenance bar feeds.

Employing a shank (available in seven diameters from 1/2" to 1 1/2") that is clamped in the lathe turret in the same manner as a boring bar, the grippers are hand turned onto the shank thread or onto adapters that attach to the shank to accept smaller diameter grippers. These self-activated grippers are slotted like standard collets and, as they advance over the bar to be pulled, are forced open to firmly grasp the bar for pulling out of the spindle to a programmed length. Only 1/4" bar engagement is needed. Gripping and release of the bar are automatic when the turret is advanced and retracted. CNC bar pull components are available individually or in kits. Bar pull shanks should be specified to the size of the boring tool holders.

Features and benefits
  • Bar pull shanks fit in most boring tool holders
  • Low cost bar pull gripper replacements
  • Pull bar to last usable part length
  • Pull positions bar +/- 0.001"
  • Works close to chuck or collet nose
  • Does not interfere with adjacent tools or turret movement
  • Only 1/4" bar engagement required

How it works...

  1. Mount shank in turret; screw on adapter (if required) and gripper.
  2. Insert bar through back of spindle and clamp with collet or chuck.
  3. Face off minimum 1/4" projection using parting off command in CNC program.
  4. Index turret to bar pull and traverse turret toward spindle for programmed distance, sliding gripper over stock.
  5. Release clamping pressure on bar.
  6. Retract turret programmed distance.
  7. Reclamp Bar.
  8. Retract turret sufficiently to clear gripper from bar.
  9. Begin programmed machining cycle.
  10. Repeat until all of bar is used.
 

Demonstration video of the bar puller in a Haas SL-10. With limited room for a bar feeder, the bar puller is used here to automate production. It's shown pulling a 4 foot long 1 inch diameter stainless steel bar. The bar is supported in the draw tube by a spindle liner made from PVC pipe.

Order Online Below!

Bar Puller Kits - Product Image
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Bar Puller Kits

Bar Puller Kits Contain the Following Components:

Part Number

Description

BAR-PULL-KIT-1 11 Grippers (1/4" to 1 1/2 in 1/8" increments) plus 5/8" and 1" adapters. (Pictured)
BAR-PULL-KIT-2 4 Grippers (1 5/8" to 2" in 1/8" increments) plus 1" adapter.
BAR-PULL-KIT-3 6 Grippers (3/16" to 1/2" in 1/16" increments) plus 5/8" adapter.
BAR-PULL-KIT-4 8 Grippers (9/16" to 1" in 1/16" increments) plus 5/8" and 1" adapter.
BAR-PULL-KIT-5 4 Grippers (1 1/8" to 1 1/2 in 1/8" increments) plus 1" adapter.
BAR-PULL-KIT-6 14 Grippers (3/16" to 1" in 1/16" increments) plus 8 grippers (1 1/8" to 2" in 1/8" increments) plus 5/8" and 1" adapter.
All kits above require choice of one Bar Pull Shank (Order Below)
BAR-PULL-KIT-7

Special Kit for Gang Tool CNC Lathes
10 Grippers (3/16" to 3/4" in 1/8" increments);
all grippers mount directly to Bar Pull Shank PB0625GT, no adapters required (this kit only);
Bar Pull Shank PB0625GT (5/8" GT) included (this kit only).


Price:   $0.00 
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Quantity:  


Bar Puller Shanks (Required for Kits 1-6) - Product Image
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Bar Puller Shanks (Required for Kits 1-6)

Bar Puller Shanks

Part Number

Description

PB0500

Bar Pull Shank 1/2"

PB0625*

Bar Pull Shank 5/8"

PB0750*

Bar Pull Shank 3/4"

PB0875

Bar Pull Shank 7/8"

PB1000*

Bar Pull Shank 1"

PB1250*

Bar Pull Shank 1 1/4"

PB1500*

Bar Pull Shank 1 1/2"

PB0625GT

For gang tool lathes only

* Click Part Number for Image.

Price:   $75.00 
Select Part No.  
Quantity:  


Bar Puller Adapters - Product Image
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Bar Puller Adapters

Bar Puller Adapters

Part Number

Description

APB0625 5/8" BarPull Adapter
APB1000 1" BarPull Adapter
APB1000GT SPECIAL 1" Bar Pull Adapter For Gang Tool Shank PB0625-GT:
Used for mounting PBG0812-PBG1250 Grippers to PB0625-GT Shank;

Price:   $58.00 
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Quantity:  


1/8" Bar Pull Gripper PBG0125 - Product Image
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1/8" Bar Pull Gripper PBG0125

Requires 5/8" threaded adapter APB0625
Price:   $58.00 
Quantity:  


3/16" Bar Pull Gripper PBG0187 - Product Image
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3/16" Bar Pull Gripper PBG0187

Requires 5/8" threaded adapter APB0625
Price:   $58.00 
Quantity:  


1/4" Bar Pull Gripper PBG0250 - Product Image
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1/4" Bar Pull Gripper PBG0250

Requires 5/8" threaded adapter APB0625
Price:   $58.00 
Quantity:  


5/16" Bar Pull Gripper PBG0312 - Product Image
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5/16" Bar Pull Gripper PBG0312

Requires 5/16" threaded adapter APB0625
Price:   $58.00 
Quantity:  


3/8" Bar Pull Gripper PBG0375 - Product Image
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3/8" Bar Pull Gripper PBG0375

Requires 5/16" threaded adapter APB0625
Price:   $58.00 
Quantity:  


7/16" Bar Pull Gripper PBG0437 - Product Image
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7/16" Bar Pull Gripper PBG0437

Requires 5/16" threaded adapter APB0625
Price:   $58.00 
Quantity:  


1/2" Bar Pull Gripper PBG0500 - Product Image
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1/2" Bar Pull Gripper PBG0500

Requires 5/16" threaded adapter APB0625
Price:   $58.00 
Quantity:  


9/16" Bar Pull Gripper PBG0562 - Product Image
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9/16" Bar Pull Gripper PBG0562

Requires 5/16" threaded adapter APB0625
Price:   $58.00 
Quantity:  


5/8" Bar Pull Gripper PBG0625 - Product Image
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5/8" Bar Pull Gripper PBG0625

Requires 5/16" threaded adapter APB0625
Price:   $58.00 
Quantity:  


11/16" Bar Pull Gripper PBG0687 - Product Image
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11/16" Bar Pull Gripper PBG0687

Requires 5/16" threaded adapter APB0625
Price:   $58.00 
Quantity:  


3/4" Bar Pull Gripper PBG0750 - Product Image
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3/4" Bar Pull Gripper PBG0750

Requires 5/16" threaded adapter APB0625
Price:   $58.00 
Quantity:  


13/16" Bar Pull Gripper PBG0812 - Product Image
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13/16" Bar Pull Gripper PBG0812

Requires 1' threaded adapter APB1000
Price:   $58.00 
Quantity:  


7/8" Bar Pull Gripper PBG0875 - Product Image
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7/8" Bar Pull Gripper PBG0875

Requires 1' threaded adapter APB1000
Price:   $58.00 
Quantity:  


15/16" Bar Pull Gripper PBG0937 - Product Image
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15/16" Bar Pull Gripper PBG0937

Requires 1' threaded adapter APB1000
Price:   $58.00 
Quantity:  


1" Bar Pull Gripper PBG1000 - Product Image
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1" Bar Pull Gripper PBG1000

Requires 1' threaded adapter APB1000
Price:   $58.00 
Quantity:  


1-1/16" Bar Pull Gripper PBG1062 - Product Image
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1-1/16" Bar Pull Gripper PBG1062

Requires 1' threaded adapter APB1000
Price:   $58.00 
Quantity:  


1-1/8" Bar Pull Gripper PBG1125 - Product Image
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1-1/8" Bar Pull Gripper PBG1125

Requires 1' threaded adapter APB1000
Price:   $58.00 
Quantity:  



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