Exhibit 12.1 Computation of Earnings to Fixed Charges Ratio (Dollars in thousands) Pro Forma (1) ------------- Three Months Year Ended Year Ended December 31, Ended March 31, December 31, ---------------------------------------------------- ----------------------- ------------- 1993 1994 1995 1996 1997 1997 1998 1997 (unaudited) (unaudited) Fixed charges: Interest expense $ 103 $ 279 $ 632 $ 1,292 $ 3,956 $ 548 $ 3,956 $ 11,905 Capitalized interest -- -- 134 255 -- -- -- -- Amortization expense -- -- -- -- -- -- -- 370 Interest portion of rent expense -- 103 104 224 429 75 155 606 ------- ------- ------- ------- ---------- ------- ---------- --------- Total fixed charges $ 103 $ 382 $ 870 $ 1,771 $ 4,385 $ 623 $ 4,111 $ 12,881 ======= ======= ======= ======= ========== ======= ========== ========= Earnings: Income (loss) from continuing operations before taxes $ 1,659 $2,541 $4,775 $5,394(2) $ (1,463) $ 1,092 $ (2,030) $ (2,217) Fixed charges 103 382 870 1,771 4,385 623 4,111 12,881 Capitalized interest -- -- (134) (255) -- -- -- -- ------- ------- -------- -------- ---------- -------- ----------- --------- Total earnings $ 1,762 $2,923 $5,511 $6,910 $ 2,922 $ 1,715 $ 2,081 $ 10,664 ======= ======= ======== ======== ========== ======== =========== ========= Ratio of earnings to fixed charges 17.1x 7.7x 6.3x 3.9x --(3) 2.8x --(4) --(5) ======= ======= ======== ======== =========== ======== =========== ========= (1) Adjusted to give effect to the Transactions as if the Transactions had occurred at January 1, 1997. (2) Adjusted to exclude writedown of $495,000 to the carrying value of the Company's former principal fabrication facility. (3) Earnings were insufficient to cover fixed charges by approximately $1.5 million. (4) Earnings were insufficient to cover fixed charges by approximately $2.2 million. (5) Earnings were insufficient to cover fixed charges by approximately $2.0 million.