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Milling machine. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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The machine successfully, after a dozen broken drills during the optimization of the algorithm :-) drills boards for me at a speed of about 10 holes per minute, even with high-hard drills that are fragile like glass. Now I even started to indulge in engraving, but I need to come up with an interface. Now it's a parallel port, so it won't work under Windows anyway :-(. DOS'om he works hard with 100.000D, and the machine can theoretically.
Machine parameters:
- processed volume - 320x230x110 mm
- theoretical accuracy - 200 steps per mm
- practical accuracy - 0.1-0.2 mm (I can’t measure more precisely)
- motor speed - up to 3 revolutions per second.
- the number of axles is now 3, but the electronics are designed for 4, + 8 limit switches.
Additional information sent by the author of the project
The main structure consists of 10 mm plexiglass. Linear furniture bearings are used as guides (quite a precision thing, but only if they are all-metal).
The movement is carried out by a worm gear (long M6 bolt with a nut :), which is rotated by stepper motors (marking: Vexta Oriental Motor Ltd., C6431-9212, 3.18V, 1.05A, 2-phase, 200 steps per revolution). The motors are fed through the L298 switches with a stabilized current of 1 A per motor, Umax up to 12 Volts (actually it should be 2A, but there are linear current stabilizers on the LM317, and they will consume too much energy).
The scheme is quite simple - a decoder and buffer registers + an RS flip-flop for limit switches. That part of the circuit where the PIC16C84 stands was never implemented - it just had to be a PWM controller ... hands did not reach the new circuit on the microcontroller.
Drill: - 10-18V DC, 45-120W, up to 20.000 rpmb/min with the right precision jaw chuck (the most expensive part of the machine costing about 70 DM :)).
Program: - a simple program that uses a list of hole coordinates that I export with a script from Eagle 3.55 (cadsoft.de) (example attached). The principle of motor control is microstep, all motors can rotate synchronously, i.e. I calculate the movement time of each engine at the beginning, take the maximum from this and adjust the speeds of the remaining motors, while setting the cycle, for example 100000, the first motor steps every 700 cycles, the second every 1400, the third every 10000 cycles - it turns out about 143,7 and 10 steps on the motor ... and so on ...
Diagrams and photographs.
Author: Certov Ilja; Publication: N. Bolshakov, rf.atnn.ru
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