Turning type multi-spindle attachment

A turning-type multi-spindle attachment for a drilling or tapping machine having a spindle in a spindle quill with an outer periphery, said attachment comprising:

• a mounting cylinder 4 non-rotatably attachable to the outer periphery of the spindle quill 1, said mounting cylinder having an axis, a central bore extending therethrough and a lower portion including a recess concentric with and larger in diameter than said central bore, said recess having an inner circumferential periphery;
• a body 28 positioned relative to said lower portion such that a turning position thereof is adjustable, said body having an upper face;
• a snap ring 61 mounted on said inner periphery of said recess, said snap ring having an upper face;
• a support ring 62 positioned in said recess adapted to engage said upper face of said snap ring 61, said support ring having a lower face;
• a plurality of turnable members 38 rotatably mounted on said body 28, each of said turnable members being in the form of a substantial cylinder having a central portion and being adapted to rotatably support a drill 51 or tap at a position eccentric to said control portion;
• a plurality of mounting bolts 65, each extending through said central portion of one of said turnable members and through said body and being threadedly inserted into said support ring from below, thereby adjustably mounting said turnable members to said body and said body to said mounting cylinder whereby, upon loosening of said bolts, said turnable members can be rotated relative to said body and said body can be rotated relative to said mounting cylinder and, upon tightening of said bolts, said body is clamped to said mounting cylinder and said turnable members are fixed to said body;
• and
• a gear transmission mechanism housed in said body interconnecting the spindle to the drills or taps supported in the plurality of turnable members.