jim jewell
Joined: 09 Jan 2006
Posts: 82
Location: Kelowna B.C. Canada
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 Posted: Mon Dec 11, 2006 7:36 pm Post subject: Tapping threads |
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I have had just enough experience abusing thread taps to advise anyone out
in RV land to use a thread cutting fluid when tapping. There are different
types of thread cutting fluids. pastes, etc. Some are specific to the type
of material being tapped. There are also general use fluids, pastes, etc.
for those less anal 'tapper' types {[ .
When tapping with the correct fluid you will find that the resulting threads
will be cut much cleaner and will most likely fit a bit tighter. the fluids
job is to lubricate and provide cooling. Use lots the stuff is cheap, Taps
are not.
Note- Using the correct Size drill is of utmost importance for good results.
When you first intoduce the tap to the hole the cutting will take very
little effort. As the tap straightens out and gets deeper into the hole the
tap will be cutting the threads deeper so the torsional loading will
increase. As the torsional loading increases it will be essential to avoid
turning the tap too much. Over loading the tap can and often will cause the
dreaded broken tap! It might also tend to tear at the unthreaded material
instead of cutting as intended.
Over loading will also run the risk of providing loose and therefore weaker
threads.
Backing the tap out a few times to remove the swarf (waste cuttings) reduces
the chance of breakage and allows the cutting fluid to do it's job better.
When the going gets tougher turning the tap 1/4, 1/8th or even 1/16th per
turn will provide the best results.
In the case of the flap rods chances are that if you have to tighten the
work piece holding device near to the point of crushing the work piece you
are going at it a bit too aggressively.
Don't be in a rush to get the job over with.
Jim in Kelowna
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"I never make mistreaks" |
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