On Sat, 10 Oct 2009 20:17:48 +0100, "ian field"
wrote:
"amdx" wrote in message
. ..
"Jim Thompson" wrote in
message ...
1/4"-20 tap calls for 0.201" tap drill (13/64")
Into a steel 1/8" panel, tap is hard enough to turn that handles flex
:-(
Is that normal, or do I need to go up one or more drill sizes?
...Jim Thompson
Do you have time to fight a broken tap out of the steel?
Been there, done that, don't like it!
Does the connection need all the strength of full threads?
If not, drill the hole larger.
If you don't drill the hole larger, at least use a good quality,
sharp tap, there is a big difference.
Either way, do use a proper lubricant.
You can't beat PTFE lubricants - slick50 or Finish line grease from a
bicycle shop.
Good idea! When I went out to get a larger bit, I bought a vanadium
tap :-)
...Jim Thompson
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