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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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20th Oct 2021, 12:53 pm | #21 |
Octode
Join Date: Jan 2003
Location: Ware, Herts. UK.
Posts: 1,082
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Re: Trouble at Mill, Bridgeport Interact 2
That machine has surprisingly unsophisticated encoders for something built in the '80s. When I first encountered rotary and linear encoders around '84 they were all of the the type that had digital squarewave A, B and Z outputs and I believe that they all had photographically processed glass disks.
Re mechanical damage to semiconductor devices - I've heard that some power devices in TO220 packages are very sensitive to bending forces and / or mechanical shock applied to the mounting tab causing breakage of the bonding wires to the device's chip. John |
21st Oct 2021, 1:16 am | #22 | |||
Heptode
Join Date: Jun 2006
Location: Ware, Hertfordshire, UK.
Posts: 988
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Re: Trouble at Mill, Bridgeport Interact 2
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For some reason Heidenhain persisted for some time with analogue encoder inputs on their CNC control systems. Perhaps it was to force the use their own encoders with their control systems. They did however offer encoders with digital A, B and Z outputs for use with control systems made by their rivals. An example of this can be found in the turret press that I electronically overhauled. It used a proprietry control system with Heidenhain digital encoders that were external to the servo motors. This machine is also from the 80s I think. Cheers Andy
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21st Oct 2021, 7:25 am | #23 |
Heptode
Join Date: Jun 2006
Location: Ware, Hertfordshire, UK.
Posts: 988
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Re: Trouble at Mill, Bridgeport Interact 2
Hi all,
I've just noticed that pin 1 of the IC shown in my last post is dry jointed. Soldering on these thick film units is incredibly difficult because the ceramic just conducts away the heat. It is at least satisfying to have spotted a potential fault that may have been the cause of all the trouble. Cheers Andy
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