been reworking the mill head and laser head for the 3D printer... again

had to drill and tap a few holes in a 3/8" thick aluminum plate for 8-32 screw/"bolt"... Aluminum is one of the more dificult metals to drill and tap being that its soft and "gummy" ( copper is another)... anyway, I ran out of WD 40 ( which is use to lubricate the aluminum for the tapping process)... didnt want to go to Walmart for WD40 so Im looking around to see what I can use as a substitute... and I saw some copper based Never Seize sitting on the shelf of my reloading station... and I said to myself... " Self, whatchathink about copper nerever sieze as a lubricant?? Self sat there a moment and finally said "dont know, lets find out"... So I grabbed the Copper based Never Seize and dabbed the tip of the tap into it an proceeded to tap the hole... it started rather easily, it began to cut into the plate and I and Self began to wonder when its going to start getting "grabby"... it never did, it just kept on tapping the hole out, no back tracking no tightning of the threads on the cuttings. Self just kept on going at it, I began to become worried that Self was going to snap the tap off in the hole like I did earlier this week... anyway Self did a wonderful job now I can take the credit for it... if it messed up all I could do is blame my Self...

but seriously... copper Never Seize has got to be the best tapping lubricant I have ever come across... all these years of tapping various metals and never tried the copper never sieze...normally tapping holes is a tedious, perilious, and frustrating job... and theres alot of "feel" involved in tapping and all it takes is that 30 degrees of motion and the tap can lock up tighter than a frogbutt... and when it locks up in both directions, you know its time to look for the trash can...
dont know if I mentioned this before or not but here it goes ... they finally designed taps to be self centering and to start straight and true... taps were designed with a general shape like a rocket nose cone, the new taps have something more like a cylinder to fit the hole and hold it straight... very nice improvement...
heres a pic of the old style of tap
View attachment 890429
heres a pic of the new style, notice the tip...
View attachment 890431
notice that there is no taper at the tip but more of a straight cut to it...
this tap with some copper never sieze and tapping 3/8" thick Al plate is eazy...