>
> Blind tapped holes are everyday occurrences commercially, its not a
> problem.
>
Right! While I prefer through holes, there are plenty of places where I
can't go through.
One thing I make is some cabinet rails that are 8 - 11" long, and have
threaded holes in the
ends. The part I copied
On Sun, 27 Mar 2011 12:29:12 -0700, you wrote:
>I avoid making any design that has blind holes. One option I have done
>with aluminum parts is to put screws or bolts into the hole and weld the
>back of the hole shut, then remove the fasteners. Another is to thread
>an Allen head set screw with th
On Thu, 2011-03-24 at 21:01 -0500, Igor Chudov wrote:
> I would like to know if I can do rigid tapping with a bottoming tap?
I avoid making any design that has blind holes. One option I have done
with aluminum parts is to put screws or bolts into the hole and weld the
back of the hole shut, then r
On 3/27/2011 10:47 AM, Stephen Wille Padnos wrote:
> Wouldn't these still leave a few threads at the bottom that aren't fully
> formed? Do you find that bolts can be threaded further into the hole
> than with a cutting tap?
A bottoming roll form tap will get you very close to the bottom. If you
Steve Blackmore wrote:
> [snip]
> Roll form taps - no chips to clear :) You can tap much nearer the bottom
> of a blind hole, the only thing to be careful of is using the correct
> tapping drill and some lube/coolant.
>
Hmm.
Wouldn't these still leave a few threads at the bottom that aren't fu
Roland Jollivet wrote:
> Why not use a thread mill?
>
> I was wondering about them, in that instead of taps, one could fashion their
> own mini fly cutter from HSS for thread milling. It will take a lot longer
> to cut the thread, but for hobby CNC milling time is not usually a problem.
>
>
For
On 25 March 2011 11:10, Marshland Engineering wrote:
> If it is not deep, start with the first tape and finish with a bottom.
This was discussed a few weeks ago, and I think it was decided that
2-hit rigid tapping was possible, but setting up the taps in the
toolholders would be challenging.
--
You can tap with a bottom tap. It all depends on the pilot hole. If you make it
a bit larger, the bottom tap will work.
Sometimes when you have a deep threaded hole, (depth > 3D) there will be enough
material left to hold the screw.
If it is not deep, start with the first tape and finish with
On Fri, 25 Mar 2011 07:46:02 +, you wrote:
>Depends if it is a machine tap, hand taps dont have the spiral to
>clear the chips,
>worse would be tolerance of the hole bottom depth, A, dont hit it. B,
>leave space for chips
>Use a machine tap that clears chips back up the flutes.
Just to add to
Why not use a thread mill?
I was wondering about them, in that instead of taps, one could fashion their
own mini fly cutter from HSS for thread milling. It will take a lot longer
to cut the thread, but for hobby CNC milling time is not usually a problem.
Regards
Roland
On 25 March 2011 04:01, I
Depends if it is a machine tap, hand taps dont have the spiral to
clear the chips,
worse would be tolerance of the hole bottom depth, A, dont hit it. B,
leave space for chips
Use a machine tap that clears chips back up the flutes.
Dave Caroline
On Fri, Mar 25, 2011 at 2:01 AM, Igor Chudov wrote
On Thursday, March 24, 2011 10:38:16 PM Igor Chudov did opine:
> I would like to know if I can do rigid tapping with a bottoming tap?
The tap makers in general don't think tapping the whole hole with the
bottoming tap is a good idea Igor, short life, not enough chip storage in
the grooves etc.
I would like to know if I can do rigid tapping with a bottoming tap?
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