Difference between revisions of "General Thread File"
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'''HarryMann: ''' Some here may not have come across a thread file, but these are very handy tool for cleaning/trueing up slightly damaged threads. In some cases, depending on the nature of the damage and the therad material, quite badly | '''HarryMann: ''' Some here may not have come across a thread file, but these are very handy tool for cleaning/trueing up slightly damaged threads. In some cases, depending on the nature of the damage and the therad material, quite badly damaged threads can be restored with a little TLC using a thread file. | ||
They're used in the way of a file, back and forth, | They're used in the way of a file, back and forth, not with great pressure and of course, revolving the thread or the file. The threads have to be nicely engaged and they are used not at right angles to the thread but at the thread's helix angle, slightly offset to the normal angle. | ||
The most important thing of course is to select the correct thread! Whether you know or not the target damaged thread, always lay the therad file onto the | The most important thing of course is to select the correct thread! Whether you know or not the target damaged thread, always lay the therad file onto the thread and using a strong backlight, eyeball the two together to make sure you are in fact using the correct one. It's the pitch that will show as a run out... there will always be some light ebtween the bottom of the #Vee' and the therad, the normal clearance that a nut running on the therad is allwoed, dependent upon thread class (tolerance). | ||
N.B. There are of course different pitches for each thread in the metric range, see the following link to Metric threads... std. metric is usually medium or coarse, and fine is usually non-standard. | N.B. There are of course different pitches for each thread in the metric range, see the following link to Metric threads... std. metric is usually medium or coarse, and fine is usually non-standard. | ||
[[Image:Example.jpg]] | [[Image:Example.jpg]] | ||
Revision as of 20:17, 5 December 2006
HarryMann: Some here may not have come across a thread file, but these are very handy tool for cleaning/trueing up slightly damaged threads. In some cases, depending on the nature of the damage and the therad material, quite badly damaged threads can be restored with a little TLC using a thread file.
They're used in the way of a file, back and forth, not with great pressure and of course, revolving the thread or the file. The threads have to be nicely engaged and they are used not at right angles to the thread but at the thread's helix angle, slightly offset to the normal angle.
The most important thing of course is to select the correct thread! Whether you know or not the target damaged thread, always lay the therad file onto the thread and using a strong backlight, eyeball the two together to make sure you are in fact using the correct one. It's the pitch that will show as a run out... there will always be some light ebtween the bottom of the #Vee' and the therad, the normal clearance that a nut running on the therad is allwoed, dependent upon thread class (tolerance).
N.B. There are of course different pitches for each thread in the metric range, see the following link to Metric threads... std. metric is usually medium or coarse, and fine is usually non-standard.
