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#1
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PL259 Thread standard
On Mon, 12 May 2008 12:44:23 +0100, "Jeff" wrote:
"John VK2KCE" wrote in message ... Thanks Dan, I have ordered a die nut to correct the problem, I suspect that the thread will not have the full strength after using it though! Whist running a die over the thread will allow a 'normal' 259 the be screwed onto the socket it does reduce some of the thread to almost nothing, so I would not recommend that method where there is any mechanical strength required such as an antenna base. 73 Jeff In over 20+ years of use I have never experienced anything like that. If you think about it, the difference between the metric and american threads - in the case is - is slight (Look just how far you can screw a PL-59 on the meteric socket) and a very small amout of material is removed. Have you really ever tried this method? 73, Danny, K6MHE |
#2
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PL259 Thread standard
Whist running a die over the thread will allow a 'normal' 259 the be screwed onto the socket it does reduce some of the thread to almost nothing, so I would not recommend that method where there is any mechanical strength required such as an antenna base. 73 Jeff In over 20+ years of use I have never experienced anything like that. If you think about it, the difference between the metric and american threads - in the case is - is slight (Look just how far you can screw a PL-59 on the meteric socket) and a very small amout of material is removed. What you will see if you actually try this method is that the threads will be reduced in thickness over about half the length. The reduction getting worse as you progress. The threads will have reduced to such an extent towards the end as to render then no more than bumps. Have a look at one you have done this to under a magnifying glass and you will see. 73 Jeff |
#3
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PL259 Thread standard
On Mon, 12 May 2008 15:21:49 +0100, "Jeff" wrote:
Whist running a die over the thread will allow a 'normal' 259 the be screwed onto the socket it does reduce some of the thread to almost nothing, so I would not recommend that method where there is any mechanical strength required such as an antenna base. 73 Jeff In over 20+ years of use I have never experienced anything like that. If you think about it, the difference between the metric and american threads - in the case is - is slight (Look just how far you can screw a PL-59 on the meteric socket) and a very small amout of material is removed. What you will see if you actually try this method is that the threads will be reduced in thickness over about half the length. The reduction getting worse as you progress. The threads will have reduced to such an extent towards the end as to render then no more than bumps. Have a look at one you have done this to under a magnifying glass and you will see. 73 Jeff Jeff, The TPI between the two standards (American and metric) - in this case - are very close resulting in very little thread stock being removed. In the short thread length involved here (about 1/2-inch) and the threads are not rendered to nothing more than bumps.However, at longer thread lengths it well could be a problem, but not at the 1/2-inch distance we are talking about here. Again I ask, have you actually tried this? I have used this method numerous times for myself and friends and I have never experienced any kind of failures or problems in doing so. That said I'm going QRT on this subject. 73, Danny, K6MHE |
#4
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PL259 Thread standard
The TPI between the two standards (American and metric) - in this case - are very close resulting in very little thread stock being removed. In the short thread length involved here (about 1/2-inch) and the threads are not rendered to nothing more than bumps.However, at longer thread lengths it well could be a problem, but not at the 1/2-inch distance we are talking about here. Again I ask, have you actually tried this? I have used this method numerous times for myself and friends and I have never experienced any kind of failures or problems in doing so. Yes. and I would not trust the end result to any kind of load, it is fine for a cable connection but certainly not as a method of retaining a mobile antenna at speed! Perhaps the difference is in the die, and the length of thread in the die. The thicker the die the truer the thread will be and the more pronounced the removal of the metric thread. The OP was suggesting a 'die nut' which will be quite thick and I suspect would produce results similar to those I have found. Jeff |
#5
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PL259 Thread standard
The TPI between the two standards (American and metric) - in this
case - are very close resulting in very little thread stock being removed. In fact the TPI's are not that close 24tpi for American (1.06mm pitch) and 1.5mm pitch for Metric fine. Jeff |
#6
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PL259 Thread standard
Jeff wrote:
The TPI between the two standards (American and metric) - in this case - are very close resulting in very little thread stock being removed. In fact the TPI's are not that close 24tpi for American (1.06mm pitch) and 1.5mm pitch for Metric fine. Jeff The metric PL259 has a pitch of 1.0 mm. It is not an ordinary metric fine thread. (5/8 - 24 is not an ordinary fine thread either.) 73, Gene W4SZ |
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