Bridgeport Series 1, table power feed.

[DaedalusParticipant @daedalus]

I have acquired an Adcock Bridgeport Series 1 with a 16 speed belt drive, (4 on the belt, 2 speed motor and 2 back gear), 48″ table and chrome ways, basically for free, just had to pay to have it moved. The 6F power feed for the table is not working. The Erskine controller board seems to be OK, although the DC voltage is on the high side with my Fluke meter at around 137V. There also seems to be a 7V output as well. Not sure what that might be. Does anyone have a manual for this board so that I can see about adjusting the voltages. I do have a wiring diagram but it is in such poor condition that I cannot read it. A full wiring diagram for the whole machine wouldn’t go amiss.

Also what should the resistances be for the motor armature across the brushes and across the field windings? I’m getting about 1.8ohms and the field is 1150ohms which seems a bit on the high side. Nothing is down to earth or otherwise a problem with a 500 volt insulation test.

And finally the only number I can find on the machine is on the front left way on the Y axis which is P1777, apparently the number on Adcock machines should be inside the rear cover, but nothing to be found there.

Thanks in advance guys.

[Barry Smith 4Participant @barrysmith4]

Not sure if you have this sorted?  The problem with the motor side is often carbon dust mixing with oil and creating a right mess.  I stripped mine down, wearing gloves and cleaned it up fitting new brushes and cable and its been working fine.  The control box can also cause problems if the limit switches or feed overide are damaged again simple clean and replacement.  The main issue I have found with erskin boxes is that there appear to be many different types,  I ultimately replaced mine with an alternative moderen design and can provide details if you need.

[Clive FosterParticipant @clivefoster55965]

Daedalus

If you are still looking for information on the Erskine drive I put what I believe to be a full compendium of the publicly available documentation in the GroupsIO Bridgeport Group files. Adjustment data, test data and a typical wiring diagram included.

Assembled with lots of help from many people including several participants on this forum.

You can either :-

sign up with the Bridgeport group to get the data at  https://groups.io/g/BridgeportMill  , there is a fair bit of the information floating around in the files too albeit rather Americentric.

or

PM me with your E-Mail address and I’ll send a copy of the data pack over along with a typical Adcock Shipley wiring diagram.

Clive

[Clive SteerParticipant @clivesteer55943]

Daedalus

Some time ago I reverse engineered the Eskine controller and have hand drawn the circuit diagram if that is any use . If so PM me and I’ll send you a copy.

Clive Steer

[Clive FosterParticipant @clivefoster55965]

Hi Clive

In your reverse engineering of the Erskine board did you manage to find a proper specification for the pulse transformer, T2 on the official circuit diagram.

All I ever managed to unearth was a part number  FX1238 8509  with no indication of manufacturer or specification.

It’s the only thing I failed to track down and it’s been bugging me for over a decade!

Apart from that I have all the data needed to for Mk V boards to circuit diagram  CD / 1114 / 03 / A / A2.

Fair number of slightly different variants out there but the actual circuits seem to be functionally the same. Just component differences. Layout modifications seem to be mostly to accommodate different heat sinking layouts and adjustment potentiometers. There is a rare earlier, smaller, board out there which I’ve never been able to find data on.

I have good board and a spare so should be set for life. These days I’d not try to repair.  Just slot in a standard DC controller and be done with it.

Another Clive

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