191 Vacuum Chuck with Replaceable Fixture Plate Part 2

Please Note: I am a beginning machinist and I do not pretend to know everything. Please always operate machinery in a safe manner and if you don't know, find a reliable source. DO NOT COPY ME. I make a lot of mistakes. I provide these videos for entertainment only.

[MachiningandMicrowaves]

Oh, bad luck about the snappages. I've just cut about 40 holes at M1.6 and M2.2 and 20 at M3, some with spiral point taps, some with spiral flutes and had no problems, but the taps are all branded and from suppliers like Guhring, YG-1 and Dormer. I snapped an M4 spiral flute tap on the way back out of a 12 mm deep hole in 6082 aluminium last week, I guess it got snarled in the spiral strings and cold-welded or something. It was #9 of a ten-hole bolt circle. I was lucky it shattered into many pieces and I got most of it out. I used a shorter screw in that hole. I don't recall ever reversing a spiral point of spiral flute tap except at the end of a hole. I suspect Mel is right about the problem being connected with backing out the spiral point tap. One day I'll run a tap into some plexiglass and watch what happens with I back it up a few times. Looking forward to the next episode!

[kentuckytrapper]

I've had bad luck backing up a spiral tap, they are designed to go forward all the way through, good looking plate, great video, keep'um coming.

[iTeerRex]

Ouch 3 taps. Hopefully they won’t cause too much trouble coming out. It’s not so much losing a tap, but rather messing up the work piece, that so much work has gone into. At least it wasn’t the machines fault. Looks like it works great.

[melgross]

I’m not sure I see the advantage with forward/back spiral point taps. They’re designed to go forward for the full depth. Spiral flute taps, as you’ve pointed out, are more delicate as there are fewer cutting faces, so I tap more slowly. Small taps are a no man’s land, even with CNCs breaking taps. If you’re using ”hand taps” for some crazy reason, then a turn, or at most two, and a backout turn is required. But why anyone would use them for this I don’t understand. I’ve replaced most of my hand taps for spirals long ago.

[Unrivaledanime]

Let us know what you find out but it kinda does sound like wrong drill size

[jeremycable]

I have the worst luck with 1/4-20 always in this exact same boat like the number 7 or whatever it is just isn’t big enough I’ve got to where I just tap everything 5/16ths anymore I can power tap it with zero issues hand tapping or power tapping either one 1/4-20 is futile for me I typically get absolutely amazed by people just plowing through their own projects like it’s nothing

[calholli]

This thread machine has you spoiled. lol