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procedure TFKondensatorMain.Timer1Timer(Sender: TObject);
begin
  DatumanzeigeLabel.Caption := DateToStr((Now));  //Datum
  UhrzeitanzeigeLabel.Caption := TimeToStr((Now));  //Zeit

  Timer1.Interval := 140;
  PBLadeStatus.Position:=(PBLadeStatus.Position + 1);
  if (PBLadeStatus.Position = 100) then
    begin
      PBLadeStatus.Position := 0;
    end;
end;					

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PBLadeStatus.Repaint;					

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PBLadeStatus.Update;					

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PBLadeStatus.Refresh;					

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for i:=0 to ganzdollviel do
begin
   Rechne_wie_wild_rum;
   Application.processmassages; 
end;					

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type
  TForm1 = class(TForm)
    Button1: TButton;
    ProgressBar1: TProgressBar;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    procedure WndProc(var Message: TMessage); override;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

type
  TMyThreadParams = record
    FHandle: THandle;
  end;
  PMyThreadParams = ^TMyThreadParams;

const
  MY_THREADMESSAGE = WM_USER + 1974;

function MyThread(p: Pointer): Integer;
var
  i: Integer;
  Handle: THandle;
begin
  Handle := PMyThreadParams(p)^.FHandle;
  for i := 0 to 99 do
  begin
    Sleep(125);
    SendMessage(Handle, MY_THREADMESSAGE, 0, i);
  end;
  SendMessage(Handle, MY_THREADMESSAGE, 0, 0);
  FreeMem(p, sizeof(TMyThreadParams));
  Result := 0;
end;

procedure TForm1.WndProc(var Message: TMessage);
begin
  inherited;
  case Message.Msg of
    MY_THREADMESSAGE:
      begin
        Progressbar1.Position := Message.LParam;
      end;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  ThreadID: Cardinal;
  ThreadParams: PMyThreadParams;
begin
  GetMem(ThreadParams, sizeof(TMyThreadParams));
  ThreadParams.FHandle := Handle;
  CloseHandle(BeginThread(nil, 0, @MyThread, ThreadParams, 0, ThreadID));
end;					

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Progressbar1.max:=SchleifenMax;
Progressbar1.position:=0;
for i:=0 to SchleifenMax do
begin
   rechne_was;
   progressbar1.position:=progressbar1.Postition+1;
   progressbar1.refresh;
end;