Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
SWIFT DAVID L
   2. Issuer Name and Ticker or Trading Symbol
TWIN DISC INC [TWIN] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
3. Date of Earliest Transaction (Month/Day/Year)
08/07/2006
(Street)

 		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock (1) (2) 08/07/2006 08/07/2006 M   800 A $ 10.9375 2,000 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Options $ 10.9375 08/07/2006 08/07/2006 M     800 08/12/1996 08/12/2006 Common Stock 800 $ 0 0 D  
Stock Options $ 14.375             08/11/1997 08/11/2007 Common Stock 1,000   1,000 D  
Stock Options $ 13             08/10/1998 08/10/2008 Common Stock 1,200   1,200 D  
Stock Options $ 11.4688             10/16/1998 10/16/2008 Common Stock 2,000   2,000 D  
Stock Options $ 9.9688             07/30/1999 07/30/2009 Common Stock 2,000   2,000 D  
Stock Options $ 8.9063             08/04/2000 08/04/2010 Common Stock 2,000   2,000 D  
Stock Options $ 7.525             08/13/2001 08/13/2011 Common Stock 2,000   2,000 D  
Stock Options $ 6.505             10/18/2002 10/18/2012 Common Stock 2,000   2,000 D  
Stock Options $ 12.45             10/15/2004 10/15/2014 Common Stock 600   600 D  
Stock Options $ 20.225             10/21/2005 10/21/2015 Common Stock 600   600 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
SWIFT DAVID L

 		   X      

Signatures

 /s/ David L. Swift   08/09/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Award of Restricted Stock pursuant to 2004 Stock Incentive Plan for Non-Employee Directors. Stock Grant will be vested in one-third increments annually until fully vested after three years.
(2) Award of Restricted Stock pursuant to 2004 Stock Incentive Plan for Non-Employee Directors. Stock Grant will be vested in one-third increments annually until fully vested after three years.

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