Second Machine Category is Late-Type Punch Machines made from 1960 to about 2001.
Most Machines were Mechanical, using "New-Style Hydra-Mechanical Head" with
2-Flywheels in Front of Machine, with 1 on Each Side of Frame. There was also 2 Hydraulic Machines Made, Super 30/40HD and Super 36/75. All used New-Style
"Swing-Arm" Punch Tool-Holders that Locked under Punch-Head, and was Easier to use than Old-Style Arm-Holder. Punch Holders came in 4 Sizes, 1 1/4 Inch,
2x2 Inch Notch, and 3 1/2 Inch for 30 Ton Machines. 40 & 75 Ton Machines could also use Optional 5 Inch Holders. Note! Sizes Refers to Largest Punch-Tool-Size Holder Could Take, and Is NOT Actual Hole-Size in Swing-Arm Holder!!!
Machines Models Sonic 18/30, Custom 18/30, Custom 30/30, Custom 30/40, Super 30/40 (Mechanical), Super 30/40HD (Hydraulic), and the Most-Popular Super 30/30.
Model Name means following; "Custom" means the Work-Table is Fixed in it's Position, where "Super" means Work-Table can be Moved Up or Down several Inches in Relation to Punch-Die Top Surface with a Hand-Crank Wheel on Lower Front of Machine. Moving Table Down gives you Clearance around Die, so you could Punch a Hole in a Metal Box, Angle-Iron, or some other Already Formed Metal Part.
First Number, as in 18/30, means Throat-Clearance, in this case 18 Inches. Second Number Means Tonnage Machine Supposedly could Punch. These "30 Ton Machines" were Not Really 30 Ton Machines, they Spray-Out Oil & Break Piston if used on Full-Capacity 30 Ton Holes or 1/4" Thick Materials. I Advise NOT Using them over 20 Ton punch-holes or thick material. Buy a Super 30/40HD Hydraulic for High-Tonnage Holes!
Super 30/40-Mechanical Machines were made in 1960's & 1970's, and were just a
Super 30/30 with Bigger Flywheels & Motor and were Definitely NOT 40 Ton Machines!