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Old 03-18-2023, 05:12 PM   #1
sam_sam_sam
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Default Modifying a 4 Position Universal Rotary Cam Changeover Switch LW26-20 for more cams

Panel Mount 4 Position 8 terminals Universal Rotary Cam Changeover Switch LW26-20 20A
( needs more cam circuits for the machine to work correctly again )

https://www.ebay.com/itm/275321870186

To
3 Position 16 Terminals Universal Rotary Cam Changeover Switch LW28-20 20A
( not 4 positions but the right amount of cams circuits )

https://www.ebay.com/itm/274660439950

I going to take the 4 position cams selector switch and remove the cams that are on it and remove the cams off of the 3 position selector switch and swap them around and I might have to reset the cams for the right configuration like the original selector switch was

Here is the video that shows how it comes apart

https://www.youtube.com/watch?v=QCU6gZwtqVU

I am working on a very old shear machine that the cam selector switch went bad
( no longer available anywhere )

The original switch is not repairable unfortunately because someone tried to repair it and some of the spring were lost for the contact to the cam

I watched a video that showed how this switch comes apart and I see no reason why it should not be able to modify it so I have enough circuits for the controller

This is the second machine that I have to modify the controller hook up parts in some way because the parts no longer available same manufacturer different model number ( the other machine was bad relays on secondary controller board went bad the part no longer available either ) got machine working again with modified board

Has anyone else tried to do this if so how did it turn out did the device work after it was modified

In either case they did not want to buy another new machine to replace the non working machine wanted to be repaired if possible with the understanding that it might not exactly work the way that it did originally but it is controllable and safe to use with this understanding in both cases it is a very small machine shop or metal working shop
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9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps

Last edited by sam_sam_sam; 03-18-2023 at 06:18 PM..
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