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Exhibit 31a
CERTIFICATIONS

I, Michael E. Batten, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of Twin Disc,
      Incorporated;

2.    Based on my knowledge, this quarterly report does not contain any untrue
      statement of a material fact or omit to state a material fact necessary
      to make the statements made, in light of the circumstances under which
      such statements were made, not misleading with respect to the period
      covered by this quarterly report;

3.    Based on my knowledge, the financial statements, and other financial
      information included in this quarterly report, fairly present in all
      material respects the financial condition, results of operations and cash
      flows of the registrant as of, and for, the periods presented in this
      quarterly report;

4.    The registrant's other certifying officers and I are responsible for
      establishing and maintaining disclosure controls and procedures (as
      defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and
      have:

      a)  designed such disclosure controls and procedures to ensure that
          material information relating to the registrant, including its
          consolidated subsidiaries, is made known to us by others within those
          entities, particularly during the period in which this quarterly
          report is being prepared;

      b)   evaluated the effectiveness of the registrant's disclosure controls
           and procedures as of a date within 90 days prior to the filing date
           of this quarterly report (the "Evaluation Date"); and

      c)   presented in this quarterly report our conclusions about the
           effectiveness of the disclosure controls and procedures based on our
           evaluation as of the Evaluation Date;

5.    The registrant's other certifying officers and I have disclosed, based on
      our most recent evaluation, to the registrant's auditors and the audit
      committee of registrant's board of directors (or persons performing the
      equivalent function):

      a)   all significant deficiencies in the design or operation of internal
           controls which could adversely affect the registrant's ability to
           record, process, summarize and report financial data and have
           identified for the registrant's auditors any material weaknesses in
           internal controls; and

      b)   any fraud, whether or not material, that involves management or
           other employees who have a significant role in the registrant's
           internal controls; and

6.	The registrant's other certifying officers and I have indicated in this
        quarterly report whether there were significant changes in internal
        controls or in other factors that could significantly affect internal
        controls subsequent to the date of our most recent evaluation,
        including any corrective actions with regard to significant
        deficiencies and material weaknesses.


Date: May 13, 2005                          /s/ MICHAEL E. BATTEN
                                            Michael E. Batten
                                            Chairman, Chief Executive Officer