The Last Spindle and Gearbox I designed as part of a Monarch PMC V 750 would deliver 30 Horse power at the spindle nose rated continuous power was 10 at 100 RPM. The full 30 HP was reached at 250 RPM.
For shorter periods the system developed 50 HP.
The spindle operating range was 20 to 8000 rpm The 50 Taper spindle spun on a combination of ball and roller bearings. the roller bearings ran with retainers We developed to replace the stock plastic roller bearing retainers. We carefully controlled the rolling element contact points and had the steel retainers plated with nickle and silver.
We could drive a 3 1/2", carbide insert, spade drill through steel making chips the size of your thumbnail.
At 8000 rpm we could run a 1 1/2" into a block of aluminum removing in excess of 200 cubic inches a minute.
We would make people jump away at machine tool shows when the chips would hit the windows on the first high power cut.
The bean counters in the company pissed me off, I left and built homes for 10 years. The Monarch company now resides in the corner of an old Smith Corona typewriter facility doing service on the old machines, they employ about 10 people.
Thanks for the memories...
