Dasqua DTI.

[Bo’sunParticipant @bosun58570]

Good morning,

I have a Dasqua DTI which I assume would have a friction pivot/clutch. However, the lever stylus does not want to move (other than operational travel) and I don't want to force it. I've asked Chronos, but they don't know and can't get an answer from their supplier.

Can any of you knowledgeable folk help please? It carries the number 5221-1001 if that helps.

[Bo’sunParticipant @bosun58570]

Friction pivot?

[JourneymanParticipant @journeyman]

Is it this one?

The image might help someone give a definitive answer but those (various other makes) that I have used all allow repositioning the probe.

John

[SillyOldDufferModerator @sillyoldduffer]

The simple answer is I don't have a Dasqui.

However, of the half-dozen DTI's I've ever used only 3 came with instructions, and none said the probe can be repositioned. So I gritted my teeth and moved the probe on all of them. Nothing broke – they all allowed the adjustment, phew! I guess probes are all designed that way because it's a fairly obvious 'good thing', both as an operator convenience and to prevent accidental damage.

Dave

[Bo’sunParticipant @bosun58570]

Yes John, that looks like the same one, except mine has a plain white face.

[CirclipParticipant @circlip]

Block that the probe is screwed into looks to be separate from the thin plate beside it.

Regards Ian.

[DalboyParticipant @dalboy]

I have an indicator and did not know the little lever could move but found that it did but was quite tight as you don.t want it moving in general use. Unfortunately it is not a Dasqua. If you do decide to try and move it do so as close to the pivot point as you can

[Bo’sunParticipant @bosun58570]

Thanks Derek, I'd be surprised if it didn't move, if only to protect the movement, after all, 0.8mm of working travel isn't very much.

[Clive FosterParticipant @clivefoster55965]

Invariably a friction joint between probe and mechanism. The probe pretty much has to be adjustable if the indicator is to be useful over a wide range of situations.

But most of the modern imports sound way too tight to me. The probes on my Verdicts shift quite easily, maybe 3 or 4 times the force needed to move the needle on the dial.

When using indicators its best not to fix them really tight to the carrier. So if everything does go wahooie the indicator can move rather than be damaged. I usually have my Verdicts loose enough that maybe twice times the force needed to adjust the probe will shift the main indicator. Sounds as if that would be way too tight for the Dasqua the OP has. Perhaps 3 or 4 times the force needed to move the mechanism would be appropriate. Which is about what I use for ordinary dial gauges.

The carrier itself needs to be properly losked down against self adjustment if mega frustration is to be avoided.

Clive

[old martParticipant @oldmart]

This type of dti can have its lever moved to any point depending how it is set up. Breakages occur when the lever is forced sideways. Some of my Miyutoyo lever types have a groove in the stylus close to the threaded end to ensure it will fracture before the pivot bearings are damaged. So far, I haven't put this feature to the test.

The picture of the Dasqua doesn't seem to show the usual friction pivot, some close up photo's would help.

Edited By old mart on 02/02/2021 15:34:56

[Bo’sunParticipant @bosun58570]

Thanks old mart, I'd love to provide a close up, but my phone still has buttons and I love my 35mm OM4Ti. Seems a simple question for Chronos to ask their supplier, but so far, to no avail.

[Oven ManParticipant @ovenman]

I have a Dasqa DTI similar to the one in Journeymans picture and yes the lever does move but is is extremely stiff. It took a long time to pluck up enough courage to push it hard enough to get it to move.

Peter

[Mike PooleParticipant @mikepoole82104]

I would try and move it if it was mine, it’s surprising how stiff they are to move on ones that do move. Given that even a careful user will one day bump the lever it must move or it’s going to break.

Mike

[Brian GParticipant @briang]

I just tried the only indicator I have here (a second-hand Starrett) on my wife's kitchen scales. 18-20g for 0.8mm travel but 300g (or more properly just over 3N) to move the lever position. 15 x the force!

Brian G

[old martParticipant @oldmart]

Posted by Bo'sun on 02/02/2021 16:12:23:

Thanks old mart, I'd love to provide a close up, but my phone still has buttons and I love my 35mm OM4Ti. Seems a simple question for Chronos to ask their supplier, but so far, to no avail.

I used to have an OM2SP, but as the bulk of my equipment is Pentax, it had to go. A nice camera all the same.

[Bo’sunParticipant @bosun58570]

Decided eventually, well in for a penny. The initial breakaway torque was very high, but once on the move it feels about as I'd expect.

Thanks for your comments.

[old martParticipant @oldmart]

Thats a good result. I have some pics of a Mitutoyo showing what they are capable of. (when I get them in the album, that is)

 

Edited By old mart on 02/02/2021 20:29:17

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