Dismantling a Verdict dti

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Dismantling a Verdict dti

This topic has 9 replies, 5 voices, and was last updated 22 September 2018 at 18:43 by Mike Crossfield.

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20 September 2018 at 18:48 #372501
Mike Crossfield
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@mikecrossfield92481
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?
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20 September 2018 at 18:48 #19081
Mike Crossfield
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@mikecrossfield92481
How does it come apart?sticky
20 September 2018 at 18:55 #372502
Michael Gilligan
Participant
@michaelgilligan61133
You may find this useful, Mike : **LINK**

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

.

MichaelG.
20 September 2018 at 20:00 #372508
Mike Crossfield
Participant
@mikecrossfield92481
Michael

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

Mike
20 September 2018 at 20:16 #372510
Mike Poole
Participant
@mikepoole82104
I think the thread rather than the link is helpful, go to page 1 of the link Michael provided.

mike
20 September 2018 at 20:50 #372515
Michael Gilligan
Participant
@michaelgilligan61133
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.
20 September 2018 at 23:40 #372529
AJS
Participant
@ajs
Doubleboost has recently had a series of videos on his website of different dti's being dismantled and serviced.
21 September 2018 at 16:36 #372601
mechman48
Participant
@mechman48
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.
22 September 2018 at 10:33 #372684
Mike Crossfield
Participant
@mikecrossfield92481
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.
22 September 2018 at 18:43 #372738
Mike Crossfield
Participant
@mikecrossfield92481
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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