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​The ENA Sleeve Sealing System

 

  1. The specified WTO tool holders include coolant back plates for through-the-tool coolant application.

  2. ENA boring bar sleeves include a unique sealant pocket at the rear end.

 

If the coolant plate is installed and the boring bar is mounted so that the back of the bar is flush with or protruding a bit from the back of the sleeve, then the pocket can be filled with sealant to provide effective and robust through-the-tool coolant, even on bars with screw flats.

  • 100% conformable sealing is achieved.

  • Cost is trivial ("disposable"). Off-the-shelf components are utilized and are offered here in kit form.

  • Seal removal and reapplication is simple for bar adjustment or replacement.

 

The specified sealant cures quickly (5 minutes), is non-toxic, non-adhesive and chemical resistant.​​​

Sealing might also improve vibration damping.

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Sealing is optional. When skipped, for instance with solid or short bars, the result is near-perfect 360deg. around-the-tool coolant flushing.​

SS2 Sealing Pocket CAD.png

Technical Tips for Internal Turning

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Mount for uni-directional force flow

  • Orient the bar and sleeve so that the set screw forces are in the same direction as the cutting force.

  • Holder set screws: only clamp on the sleeve flat! The opposite holder screws can be lightly tightened to prevent falling out or for sealing using Teflon tape.

 

Set Centerline

  • Correct tool centerline (Y-offset) is imperative on all internal turning operations for smooth cutting, feature size control, tool life and proper chip formation.

  • The smaller the bore the more sensitive it is to centerline issues.

  • The ENA sleeve indication band is wide and uninterrupted for easy and precise setting of centerline.

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Turn "Face Up"

When chatter is the main issue, turning with the insert facing up can help by directing cutting forces down into the machine bed rather than trying to lift the turret up. This can be especially effective with larger diameter and/or longer extension boring bars, higher cutting data, and lighter duty machines:

  • Left Spindle:

    • Use left-handed tools. Or:

    • Modern CAM systems that are adept at turning allow you to turn in "-X" or "opposite axis" with a simple click of a checkbox. This is useful because now you can easily turn "face up" on the left spindle using the more common right-hand tools, if you have sufficient -X travel for the job.

  • Right Spindle: use standard right-handed tools.​​​​

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