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On/off at the top with red green lights. What edge finder I?

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Daniel Robinson23/03/2019 10:26:55
51 forum posts
23 photos

The engineering company was predominately Bridgeport CNC and this was in a cupboard that was being cleared.

The on/off switch is on the top, red green lights signal the depression of a switch on the side of the device.

I know it must be some kind of edge finder but does anyone know if it is Bridgeport or what machine it is for?

Any help greatly appreciated.

Tony Pratt 123/03/2019 11:05:53
1098 forum posts
3 photos

From your description it sounds like a tool length setting gauge in the Z axis, a photo would be helpful.


roy entwistle23/03/2019 11:06:09
1148 forum posts

A photograph would help. You can see it,  we can't


Edited By roy entwistle on 23/03/2019 11:10:40

Daniel Robinson23/03/2019 11:38:06
51 forum posts
23 photos

you Guys are fast plus it was a bit of a senior moment....




Tony Pratt 123/03/2019 12:32:59
1098 forum posts
3 photos
Posted by Tony Pratt 1 on 23/03/2019 11:05:53:

From your description it sounds like a tool length setting gauge in the Z axis, a photo would be helpful.


Haven't got a clue now I can see it.


Michael Gilligan23/03/2019 13:40:00
15442 forum posts
666 photos
Posted by Tony Pratt 1 on 23/03/2019 12:32:59:

Haven't got a clue now I can see it.


Could it be a custom Go/NoGo indicator, for one hole size ?

[Daniel] ... Try putting a micrometer where thumb and finger are currently shown, to check when the lights switch.


Edited By Michael Gilligan on 23/03/2019 13:52:22

Philip Powell23/03/2019 14:30:07
66 forum posts
15 photos

Looks like a sonic screwdriver...

Sorry, I'll get my coat.


Tony Pratt 123/03/2019 16:54:09
1098 forum posts
3 photos

Daniel are there any makers marks on it?


Daniel Robinson23/03/2019 17:07:23
51 forum posts
23 photos

Not a sausage. I even opened it up and there is nothing to hint as to what it is. It’s not “Heath Robinson” so I can only think that it is commercial but from who is anyone’s guess hence coming to the fountain of all knowledge.

Daniel Robinson23/03/2019 17:28:25
51 forum posts
23 photos

HI Michael,

Thanks for pitching in. you got me thinking and I have found the lights are confusing.

On the one side is a ground hard stop of 12mm diameter. The other side is the plunger that has a travel of 2mm.

the battery could be on its last legs (4SRR44 Photo batter 6.2V silver oxide) but still measures 6.2v output.

….the lights were working and now they are not…. Bugger

Edited By Daniel Robinson on 23/03/2019 17:51:31

Martin Connelly23/03/2019 18:59:35
1211 forum posts
146 photos

I think Tony P got it with z axis setting. Try the micrometer as suggested by. Michael G and see what repeatability is like (when it is working again) .

Martin C

Daniel Robinson23/03/2019 19:46:01
51 forum posts
23 photos

Thanks Guys, I will get another battery and give is another bash.

John Haine24/03/2019 10:15:23
3000 forum posts
160 photos

I doubt that it is made for use with CNC as it doesn't appear to have any connection for the probe input.

It isn't a tool height setter (i.e. Z axis) because the button operating axis is at right angles to the longitudinal axis which would go in the chuck.

It wouldn't be a useful edge finder because they need rotational symmetry which this doesn't have at the business end.

The configuration is reminiscent of a telescopic bore gauge, but the end of the cylinder opposite the button seems to be machined flat, which wouldn't allow it to contact the bore at a single point.

What it would do is act as a go/no-go gauge to measure a slot width, that's what I think it is.

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