The Milling Machine1982

The Milling Machine1982.pdf

 

A m i l l i n g machine applies a r o t a t i n g tool t o the work, while a l a t h e applies the t o o l t o r o t a t i n g work. Much of the work that i s done on a mi 1 l e r i s 1 i k e t h a t done on a shaper, b u t t h e m i l l e r i s much faster.

Like other machine tools, the modern mi 1 l e r has evolved f rom a simp1 e beginning. The plano-mi 11 er evolved from the shaper, and i t s main job was to plane large surfaces and cut keyways i n heavy shafting. I t was much f a s t e r than a planer or shaper, but not as v e r s a t i l e as modern machines. M i 1 l i n g machines are b u i l t i n a number of styles, and the main d i f f e r e n c e s a r e i n the r e l a t i v e p o s i t i o n of the spindle and work table. Generally, i t w i 11 be ei ther a vert i c a l or h o r i z o n t a l machine, and i t w i l l be e i t h e r p l a i n or

universal.

A h o r i zontal mi 11er has i t s spindlemounted h o r i z o n t a l l y , and the feed motion of the t a b l e i s a t r i g h t angles t o the spindle and on a horizontal plane. The spindle i s mounted i n a column, 1 i k e the shaper, and the work t a b l e i s mounted on a knee t h a t s l i d e s on v e r t i c a l ways. ~t w i l l have limi ted motion i n l i n e wi t h the spindle. I f the main feed motion i s f i x e d a t r i g h t angles to the spindle, i t i s c a l l e d a p l a i n m i l l e r . universal m i l l e r s have a feed motion that can be at oblique angles to the spind l e center, and they have feed mechanisms t h a t generate compound motions of the t a b l e and work piece. V e r t i c a l mi 11s have the same t a b l e motions i n each class, but t h e s p i n d l e i s mounted v e r t i c a l l y i n a q u i l l . The engraving on the f o l lowing page i s of a number 8 Brainard p l a i n mi 1 l i n g machine. I t was massively bui 1 t i n a l l of i t s parts. The spindle was 2 1/811 i n diameter, and i t c o u l d be raised 6 1/211 above the table. fie t a b l e was 611 wide and 2411 long. I t had an automatic feed o f 10 1/211.

The cross motion i n l i n e w i t h t h e s p i n d l e was 4 3/811. Not i c e the huge diameter of the over arm, and the broad face of the spindle gear. This was a heavy duty machine, able t o m a k e a v e r y d e e p c u t i n a s i n g l e p a s s . I t weighed 950 pounds, and sold f o r $275.00 i n 1888.

We’ve borrowed the main features of t h i s machine i n t h i s project, and we replaced the over arm w i t h a t a i 1 stand to adapt i t f o r home construction and use.

 

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