Great machining in this video. Love it when the chips fly into the camera lens.

@JohnSL

3 жыл бұрын

Thanks. What's not to like about a rooster tail of chips!

That is a great way. Thanks Joe π. So glad you found it. Next to find is longer mills to fully use the technique.

@JohnSL

3 жыл бұрын

If I had a longer end mill, I could use the traditional hat method, when I milled down to just shy of the vise jaws, flipped it over, and decked off the hat.

Hey John, there’s an even easier way. You really only need to do a rough G54 once. Set up your stock and set a rough G54. Face the top. Then use a large end mill and do all sides down to just above the jaws of the vise. I Mitee-Bite jaws with Talon inserts. I typically only need to hold about 60 thou. I leave about 10 thou around the sides and do a 2D contour finishing pass. Then i raise my stop to locate the stock. I flip the stock. I then face off the 60 thou. Bam! This way you don’t run the risk of mismatch sides.

@JohnSL

3 жыл бұрын

Yes, I could do that if I had a longer end mill. Someone provided me a link to a 5" long 3/8" reduced shank end mill. That would certainly do it. However, I'm not sure I'd want to dedicate a slot in the tool change for it, as I probably would not use it for roughing. There are definitely pros and cons to Joe Pi's method, as I've modified it, vs. the traditional method where you leave a hat and then need to mill away the hat.

Great video John. I stumbled across Joe's method earlier this week. Now I'm wondering if the magic of KZread's recommendation algorithms lead me there ...

@JohnSL

3 жыл бұрын

He rightly so has way more subscribers than I do. As to KZread's algorithms, that's a mystery to me :-).

Thank you so much 🙏🏼🙏🏼🙏🏼🙏🏼🙏🏼 You've got no idea of how you just save my machining time. I have always look to something like this, justbto spicy up a bit my way of machining quick. Thank you. You the best ✌✌✌✌✌

@JohnSL

2 жыл бұрын

Glad I could help!

I am so happy to know that I am not the only one to install a paper towel holder. Also, I may or may not have also installed a cup holder next to my touch screen - currently analyzing the risk/reward benefits of this decision.

@JohnSL

3 жыл бұрын

Not a bad idea on the cup holder... The paper towel holder has been super helpful to dry off the parts (or my hands) from the coolant.

What's the largest tool diameter an ISO 20 can hold? For long reach stuff I've used Walter Valentine "Center-dex" mills. The have long reach and can drill, mill, and face. But their effectively limited to a single cutting flute. Or find yourself a reduced shank insert milll, I'll have to find a part number for you. After you square up the stock it's always a good idea to throw it across a surface plate and check parallelism. I know I've been bitten when I hit the size but not the squareness or parallelism.

@JohnSL

3 жыл бұрын

Yes, I could use a long-reach, reduced shank end mill. As I replied to another person, I'm not sure I'd want to dedicate a slot in my ATC for that. And good point about the surface plate. Most of the time my precision needs are not that high. But I should have a look to see what it's like.

Another way is, on the first op, with the profile cut, cut it 0.040" oversized, then when you turn the block on different ends, you can zero from the top on your profile cut and face down 0.02".

@JohnSL

3 жыл бұрын

I could. I believe this would increase the tolerance stack up, and therefore potentially decrease the accuracy.

so that the "classes" - (substrates to adjust the height of the workpiece in the vise) do not fall after blowing air, fix them with a construction or stationery rubber band width, 8-10 mm

@JohnSL

3 жыл бұрын

True, I could. It's never bothered me enough to do that, though.

its nice to see some real engineering. but what is the billet going to be ?

@JohnSL

3 жыл бұрын

That, unfortunately, I was asked not to share.

@zackcross3626

3 жыл бұрын

@@JohnSL I think in the Machinery Handbook, Volume 18, under the miscellaneous footnote - it states that 2 inquiries about a part has greater validity than the single request for anonymity. If you look, its right after the topic of accidentally machining ones parallel.

I'm curious. Why not mill the ends in the first setup?

@JohnSL

3 жыл бұрын

I don't have an end mill that has 2" of cutting depth. Because my holders are ER-16, I'm limited to a 3/8" diameter end mill.

@Paulctan

3 жыл бұрын

JohnSL www.mcmaster.com/end-mills/length-of-cut~2/carbide-square-end-mills-9/

@JohnSL

3 жыл бұрын

Thanks Paul. I knew they existed, but I don't have one. Others have suggested a reduced shank end mill, which would be stiffer and therefore have less deflection.

I have never seen a more long winded method. Aim for 6 passes 1 for each face.