Plug gages and comparative depth gages…

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  • #48615
    tmac1956
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    • Topics Started: 171
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    All:

    I’ve been looking at Enco for these to tools, but I don’t want to spend too much, or on the other hand, buy junk. Does anyone have any recommendations?
    (I’ve been reading George Daniels book “Watchmaking”)

    Thanks!
    tmac

    #53596
    tmac1956
    Participant
    • Topics Started: 171
    • Total Posts: 1259

    Well, I think probably need to re-phrase the question. Regarding the plug gauges… they come in what I believe to be a minus tolerance and a positive tolerance. So which do I need?

    Thanks in advance!

    tmac

    #53597
    gerene
    Participant
    • Topics Started: 16
    • Total Posts: 377

    Maybe I completely misunderstood you and/or Daniels but the way I read Daniels he talks about making your own plug gauges either tapered or parallel.
    For tapered gauges he suggests marking them in convenient intervals after measuring with a micrometer, whilst for standard diameters he suggests parallel gauges turned down to the full diameter of the jewel and then to reduce one end to two smaller diameters.

    I tried to find what you where looking at buying but could not find your supplier (lots of enco companies but none relevant).

    Again if this is not what you where referring to then I apologize (only a beginner).

    Jan

    #53598
    tmac1956
    Participant
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    @gerene wrote:

    Maybe I completely misunderstood you and/or Daniels but the way I read Daniels he talks about making your own plug gauges either tapered or parallel.
    For tapered gauges he suggests marking them in convenient intervals after measuring with a micrometer, whilst for standard diameters he suggests parallel gauges turned down to the full diameter of the jewel and then to reduce one end to two smaller diameters.

    I tried to find what you where looking at buying but could not find your supplier (lots of enco companies but none relevant).

    Again if this is not what you where referring to then I apologize (only a beginner).

    Jan

    Jan:

    ENCO has them in sets of differing diameters and you can puchase a holder for about $6.00. The entire thing is less than $45.00. The question I have is you can get them in minus sizes or plus sizes – I think they are talking about tolerancing but I’m not sure and needed to know before I bought the wrong thing. They have sizes small enough to work for watches.

    Thanks!
    tmac

    #53599
    Bob Tascione
    Moderator
    • Topics Started: 38
    • Total Posts: 1559

    Hi Tom,
    Yes you’re correct about having to do with the tolerances. If you’re talking about the ENCO Class ZZ Steel Pin Gage Sets then the minus tolerance set would mean that the pin ‘should not’ exceed the stated diameter but could fall under the stated size by -0.0002. So as an example a pin that is say .030 dia. would not exceed .030 but could fall below .0002 to .0298. The Plus Tolerance sets would be just the opposite. In many machine shops and most tool rooms you’ll find both sets on hand but given the choice of just one set I prefer the minus tolerance set. Just my personal preference though.

    Hope this helps Tom,
    Bob

    #53600
    tmac1956
    Participant
    • Topics Started: 171
    • Total Posts: 1259

    @Bob Tascione wrote:

    Hi Tom,
    Yes you’re correct about having to do with the tolerances. If you’re talking about the ENCO Class ZZ Steel Pin Gage Sets then the minus tolerance set would mean that the pin ‘should not’ exceed the stated diameter but could fall under the stated size by -0.0002. So as an example a pin that is say .030 dia. would not exceed .030 but could fall below .0002 to .0298. The Plus Tolerance sets would be just the opposite. In many machine shops and most tool rooms you’ll find both sets on hand but given the choice of just one set I prefer the minus tolerance set. Just my personal preference though.

    Hope this helps Tom,
    Bob

    Bob

    That’s what I thought – but now I know for sure. Yes – that’s a big help.

    Oh… What set size would you recommend for watches to start: 0.0110 min. to 0.0600 max. or min .0610″ to .2500″ ?

    Thanks!
    Tom

    #53601
    david pierce
    Participant
    • Topics Started: 90
    • Total Posts: 1360

    Tom,
    The sizes you need depend on the hole diameters you need to measure. For watches this means small sizes. Most of the watch pivots I measured are around .004 inches or .1mm. The sets start at .o1 inches so you will have to purchase or make the smaller sizes. The reason for the minus and plus sizes is the measurement process is done with with the GO/NO GO technique. If the small gauge goes through the hole and the large size does not, the diameter of the hole lies between the two gauge sizes. This means that in order to get the proper use from the gauges, both the minus and plus sizes are needed.
    david

    #53602
    tmac1956
    Participant
    • Topics Started: 171
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    @david pierce wrote:

    Tom,
    The sizes you need depend on the hole diameters you need to measure. For watches this means small sizes. Most of the watch pivots I measured are around .004 inches or .1mm. The sets start at .o1 inches so you will have to purchase or make the smaller sizes. The reason for the minus and plus sizes is the measurement process is done with with the GO/NO GO technique. If the small gauge goes through the hole and the large size does not, the diameter of the hole lies between the two gauge sizes. This means that in order to get the proper use from the gauges, both the minus and plus sizes are needed.
    david

    david:

    ENCO has a set starting at .006 inches min. to .06 max in both plus and minus. Unfortunately, they’re a bit higher than the imports. However, I guess I’ll just have to cough it up if I want to have an adequate set of tools to approach the sizes that you mention.

    As usual, thanks for the information!
    tmac

    #53603
    Bob Tascione
    Moderator
    • Topics Started: 38
    • Total Posts: 1559

    Sorry Tom,
    I read your response to my post immediately after you posted (I was online when you were posting) and the question about what sizes to get wasn’t there. You must have edited and added that question to the post a little later. Anyway looks like David got you covered ok.
    Enjoy,
    Bob

    #53604
    tmac1956
    Participant
    • Topics Started: 171
    • Total Posts: 1259

    @Bob Tascione wrote:

    Sorry Tom,
    I read your response to my post immediately after you posted (I was online when you were posting) and the question about what sizes to get wasn’t there. You must have edited and added that question to the post a little later. Anyway looks like David got you covered ok.
    Enjoy,
    Bob

    Bob:

    I figured something like that. Yes – david stepped up and gave me the information. Even if I order the smallest sets they have in +/-, I ‘ll still need to make a few myself. But that’s fine.

    Thanks!
    tmac

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tmac1956Plug gages and comparative depth gages…