LEFT HAND TAPS AND DIES.

Discussion in 'Horological Tools' started by Altashot, May 13, 2019.

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  1. Altashot

    Altashot Registered User

    Oct 12, 2017
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    Where do I find a set?
    Metric and imperial in the small sizes that are suitable to what we do.

    I have a small Swiza alarm clock with a stripped out winding key.

    Thank you.

    M.
     
  2. Dushan Grujich

    Dushan Grujich Registered User

    Jun 20, 2003
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    G'Day!

    It would be much, much cheaper to make exactly what You need, instead of finding and buying a set or two. Just for example, a new set 0.30 - 1.20 mm right hand goes for over a $1K, a left hand would go at least twice as much. So, make your pick.

    Cheers, Dushan
     
  3. Altashot

    Altashot Registered User

    Oct 12, 2017
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    Wow! Really, that much!?

    So, if I only need one, where do I get it from?

    Thank you

    M.
     
  4. sharukh

    sharukh Registered User
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    Oct 10, 2011
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    Dushan already told you. Make one. Google is your friend. If you don't have a screw cutting lathe, you need to find someone who does.

    Or better still, look for a replacement key. Much cheaper and simpler.

    Sharukh
     
  5. Altashot

    Altashot Registered User

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    I would still like to know who sells these things, no matter the cost.

    Whether I choose to by a set or two, or make it myself or have it made, that is my pick.

    Thank you.

    M.
     
  6. wefalck

    wefalck Registered User

    Mar 29, 2011
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    What sizes are you talking about, what precision and how many threads are you expecting to cut ? Left-hand taps are generally more expensive, but can be found on ebay at least for sizes above M1. Smaller ones are indeed likely to be rather expensive.
     
  7. DeweyC

    DeweyC Registered User
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    Feb 5, 2007
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    Ok. One way I read (never tired) was to make a flat tap (tow parallel sides) and turn it in reverse. If I were desperate, I would take a rt. hand screw of the correct size, and grind it to produce a flat tap. Since you are using it in brass, hardening may not be needed.

    In addition to eBay, you can also check with material houses like McCaws or Jules Borel to see if they can order you one. Might well be $75; but ...

    Now, how are you going to increase the ID of the winding key so that you can tap the correct thread? Are you better off squaring the shaft and fitting the key that way? Have you looked for assortments of winding keys?

    What is the OD of the threaded shaft? Someone here may have one.
     
  8. Altashot

    Altashot Registered User

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    I have not checked the size or pitch yet. I was looking for taps first.

    Besides, I have other projects where I could use small left hand taps in another industry that I’m involved in.

    The key is an extra long reach, one I haven’t found anywhere.
    It’s already been worked on and massacred as it is. I was going to fabricate a new one. My only hurdle is the left hand thread.
    I guess I could cut off an available key and add an extension.

    Thank you for your suggestions.

    M.
     
  9. Jerry Kieffer

    Jerry Kieffer Registered User
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    May 31, 2005
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    M.
    Left Hand Taps and dies are readily available in singles from several sources, but you must first identify the size required.

    A couple of examples are as follows

    Taps Metric Left Hand - Minitaps

    For sizes 1.7mm , 0-80 and up

    High Speed Steel Metric Left Hand Taps

    While unavailable micro taps are easily machined in either right or left, metric or inch, the key is to avoid carbon build up in very small threads during the hardening/tempering process that greatly decreases their efficiency. I can further discuss if need be.

    Jerry Kieffer
     
  10. karlmansson

    karlmansson Registered User

    Apr 20, 2013
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    Figuring out the dimensions is probably a good first step. If it’s an oddball thread you may have more trouble finding that than the trouble you’ll have finding left handed ones. If you don’t have single point threading capabilities you could probably ask someone to help you out, if you end up having to make it that is.

    Regards
    Karl
     
  11. Dushan Grujich

    Dushan Grujich Registered User

    Jun 20, 2003
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    G'Day!

    One of the places one can find replacement for the damaged key would be Rudolf Flume materials house in Germany. Have you stated the Swiza model perhaps I could have given You Flume's part number from their catalogue.

    Cheers, Dushan
     
    DeweyC likes this.

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