1. Mitsubishi RA90 4 axis Wire EDM
4/15/2017
Mitsubishi RA90 4 axis Wire EDM
Machine Tool Technology
Lake Area Technical Institute
Some pictures copied from Mitsubishi
Mits EDM Intro.ppt

2. Outline RA90 Overview -Slide 3 Control Buttons and Lights
Jogging the machine
Rethreading the wire -Slide 37
Mounting Workpieces
Pickups
Nozzles
Flow of Machining Operations
Power Settings Mitsubishi-Epacks

5. Control Panel

10. The 4 different axes
X is the left to right
Y is front to back
U is to X and moves on top left to right
V is to Y and moves on top front to back
What we program will be 2 axis programs. -We will use the taper function, which utilizes all 4 axes, but 4-axis programming is VERY difficult.

11. Control Buttons and Lights Pg 1

17. Start up Press the Screen on/off button
To turn the screen back on
Release the emergency stop button
The computer is ready to be used now
To jog the machine you must press the Ready button.
Press the “Ready” button
The Deionization system will start
You will be able to jog the machine or start a cut.

18. 2nd
1st
3rd

19. Shutdown Press the Emergency Stop button
Clean the water and debris off
Turn off the light
Close the front cover
Turn off the screen with the screen on/off button
Screen Off

20. Start up from Complete Shutdown
Press POWER ON (green button located on top of the screen)
NOTE: do not need to do the following
ZERO POINT RETURN
located on the work piece setup page
Press READY button located on top right hand side of the control panel
Move to LEFT REAR corner using the hand held pendant (can adjust the speed by pressing one of the 4 speed keys)
Work piece setup
Select all axis (when finished at the top right of the screen it will display MOVE FN = move finished)

21. Workpiece Setup Screen

22. Jogging the machine On the Handheld pendant Press the Hand button
The speed of movement is selected at the top of the pendant.
Rapid, Medium, ,
Press and hold one of the 4 bottom buttons
-X, +Y, -Y, +X

23. Hand Held Pendant

24. 0.0005
Medium
Rapid
0.0001
Edge Find
Wire Align
Center Find
Manual
Wire Contact
Do Not Use Yet
Jogs the U or V axes

27. Jog Speeds

28. Mounting Workpieces The Bed of the RA90 is Soft Stainless steel
Don’t drop parts, etc. on it!
Threads do Not go through
So the screws do not hit the bottom flush cup
Use paper towels to clean it
Not shop rags
Incase there are metal chips in the rags
Lay workpiece on edge and tilt down
Place a penny under the heel block

30. Misc. Notes Keep clamps etc. low profile
So they do Not hit the upper guide etc.
You do not have to clamp them as good as on a milling machine.
The EDM does not apply any pressure to the workpiece.
Use stainless steel capscrews and fixturing when possible

31. Rethreading
Gently pull the wire through the top wire guide. Above the top wire guide, there is a wheel with a handle on it, USE IT to bring out more wire approximately 2.5 feet.
Then there are 2 ways of turning on the WIRE COLLECT.
Flip the toggle switch up, located at the lower part of the control panel.
And it will start. You should hear the vacuum sound start.
Press the S10 key NEXT and the wire collect will appear the S7 key.
The “S” keys are located at the bottom of the screen.

35. Pickups
Work-piece pickups

37. Pickup Center of Hole Select the Center button on the pendant
Press one of the directional axis jog buttons
This determines where to start the touch-off

39. Corner Pick-up Select the Corner-p button on the pendant
Set the following
Start Dist X ______
Y ______
Machine St. Pt. X ______
Measure times _1_
Stp. IN

40. Edge Pickup
Used to find one edge’s location.

42. Water level Gauge
Water Level Low
Correct Water
Level
Water Overfull

43. Nozzle Positioning
Upper water nozzle should be away from the top of the workpiece.

46. Flow of Operations to Run a program

48. Power Settings Mitsubishi-Epacks
The “IP” is the parameter
we change.
-We reduce the “IP” if
Wire keeps breaking

51. 4/15/2017
Mits EDM Intro.ppt

52. 4/15/2017
Mits EDM Intro.ppt

53. We change the “Epack”
From roughing/ finishing
We reduce the “IP” if
Wire keeps breaking

55. That’s IT!
Any Questions?