Good even for mild steel too. Best is your good advice to use the drill
press to keep the tap aligned. softer aluminum alloys are very "sticky"
and demand backing off a turn for almost every turn forward for cutting
taps to break the chip. I've found that the 6/32 tap is the most easily
broken. sigh.
Pay attention, the tap drill is not the same for the forming tap as it
is for the cutting tap.
Don
On 2017-07-28 13:46, cdel...@juno.com wrote:
Well I did some research and found my new best friend!
If you remember I needed: "I have a square aluminum tube 5" X 5" with
a
.25" wall it's 8 1/2" long.
I need 20 holes in each end tapped for 4/40 and 1/2" deep."
This for a Rubidium standard I am working on.
I found all about self forming taps!
I drilled the 20 1/2" deep holes and then made a handwheel to attach to
the pulley on my drill press. After mounting the tap in the drill press
and putting a dab of Crisco on the tap I was able to tap each hole to a
depth of 7/16" as fast as I could turn the handwheel!
I then got another 8-32 self forming tap to do the holes for 15
feedthru
capacitors, again as fast as I could turn the handwheel.
I'm very happy to discover these taps!!!!
Cheers,
Corby
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--
Dr. Don Latham
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304
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