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Dismantling a Verdict dti

How does it come apart?sticky

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Mike Crossfield20/09/2018 18:48:52
275 forum posts
36 photos

I have an ancient Verdict lever dti which I use a lot. Unfortunately it has become sticky, with a dead band at the end of the scale. I am losing about 30% of the scale travel. I have taken the side cover off (one screw) and it’s clear that the scroll which disappears into the back of the scale is sticking at one end of its travel. I can’t see how to dismantle the gauge any further in order to get at the offending bits. Can anyone advise?

Michael Gilligan20/09/2018 18:55:42
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20052 forum posts
1040 photos

You may find this useful, Mike : **LINK**

https://www.model-engineer.co.uk/forums/postings.asp?th=135501&p=2

.

MichaelG.

Mike Crossfield20/09/2018 20:00:41
275 forum posts
36 photos

Michael

Interesting to read the original patent application, but it doesn’nt give any clues as to how to open my unit up.

Mike

Mike Poole20/09/2018 20:16:41
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Moderator
3299 forum posts
73 photos

I think the thread rather than the link is helpful, go to page 1 of the link Michael provided.

mike

Michael Gilligan20/09/2018 20:50:10
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20052 forum posts
1040 photos
Posted by Mike Crossfield on 20/09/2018 20:00:41:

Michael

Interesting to read the original patent application, but it doesn’nt give any clues as to how to open my unit up.

Mike

.

Perhaps you could post some photos of your unit ... There are several slight variations on the theme, so actual dismantling procedure may vary a little.

MichaelG.

AJS20/09/2018 23:40:44
37 forum posts

Doubleboost has recently had a series of videos on his website of different dti's being dismantled and serviced.

mechman4821/09/2018 16:36:40
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2947 forum posts
468 photos
Posted by AJS on 20/09/2018 23:40:44:

Doubleboost has recently had a series of videos on his website of different dti's being dismantled and serviced.

+1 Doubleboost has made a couple of videos of his mate Bob carrying out overhauls on different DTI's, he's up to video # 3, iirc

George.

Mike Crossfield22/09/2018 10:33:54
275 forum posts
36 photos

As I said in my original posting, my Verdict gauge is a lever type. The doubleboost videos all relate to the push action variety, which work completely differently.

I’ll try to take some photos to make things clearer.

Mike Crossfield22/09/2018 18:43:08
275 forum posts
36 photos

Went out to the workshop with the intention of taking some photos, but in the course of playing around with the dti some more I realised what had caused the problem and fixed! It! A little while back I removed the two finger pivot adjusting screws in order to clean and degunge. What I’m pretty sure happened without me realising it was that the other end of the now-loose operating arm was able to slip out of engagement with the helix. When things were put back together the arm engaged with the helix one turn along, at a position where there was very little preload. Moving the operating arm one turn of the helix along has put everything right.

I’d still be interested to know how the dial part of the gauge comes apart!

Mike

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