Browse Prior Art Database

Microdrilling Device

IP.com Disclosure Number: IPCOM000091183D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Englert, AO: AUTHOR

Abstract

Microdrilling device 2, drawing 2, has spindle 3 which carries tool 4 and is rotatably supported in a pair of air bearings 5 mounted in vertical legs 6 of support 7. Spindle 3 is driven by motor 8 through belt 9. This is skewed to bias spindle 3 in the axial direction away from workpiece 10 and into continuous contact with wear insert 11. Spindle feed is provided by diaphragm cylinder 12. This reciprocates shaft 13 connected at one end to diaphragm 14. Shaft 13 carries insert 11 at the opposite end and is supported by air bearing 16. Each of bearings 5 and 16 is supplied by line 17.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 63% of the total text.

Page 1 of 2

Microdrilling Device

Microdrilling device 2, drawing 2, has spindle 3 which carries tool 4 and is rotatably supported in a pair of air bearings 5 mounted in vertical legs 6 of support 7. Spindle 3 is driven by motor 8 through belt 9. This is skewed to bias spindle 3 in the axial direction away from workpiece 10 and into continuous contact with wear insert 11. Spindle feed is provided by diaphragm cylinder 12. This reciprocates shaft 13 connected at one end to diaphragm 14. Shaft 13 carries insert 11 at the opposite end and is supported by air bearing 16. Each of bearings 5 and 16 is supplied by line 17.

When the pneumatic feed control logic circuit is turned on, the turbulence amplifier combination TA1 and TA2, connected as a flip-flop, has a logical one output at output 18 of TA2. Thus, the output of turbulence amplifier TA3 is off and the output of TA4 is on. Under this condition TA5 is off, which maintains diaphragm amplifiers 20 and 21 in an off condition. Diaphragm amplifier 22 is on which causes the input 24 to hold diaphragm 14 in a retracted position.

When a start pulse appears on line 25, the flip-flop is switched to provide an off condition at output 18 of TA2 which places TA3 under the control of pulse generator 27. The latter includes a disk 28, drawing B, that controls the output of jet sensor 29 as regulated rotation flow restriction is introduced and removed. During the drilling portion of the cycle, the output of jet sensor 29 is off, of TA3 is on...