Member postings for Fulmen

Wouldn't a "teach in" CNC make more sense today? As in a CNC lathe with some sensible manual controls.

I had a friend who programmed in straight hex. I'm not totally convinced he was human.

I think they sell it to western "mfgs" at a premium. So the equipment we buy from high end brands might very well be made in China.

Edit: Bill beat me to the punch.

Edited By Fulmen on 27/04/2023 19:16:26

China can make any quality you'd like. They have a space program, you don't get that using ebay quality equipment. But it will cost you.

For quality drills I've always chosen either Dormer or Gühring.

Well it's certainly possible. Just youtube "work hardening bronze", bladesmiths do it all the time. And most brasses should work harden as well.

Here's a fun demonstration from Finland: https://www.youtube.com/watch?v=AqNHwc8MGTM

For a thin walled bushing it should be possible to just work the top layer, but you'll have to do your own tests to see how deep you get. The real question is how to get predictable results. One approach would be to over-harden it somewhat and then temper it back somewhat.

Zan might not be entirely wrong (but not right either).

They might work better on thin walled parts for the same reason that a 6SC (6-jaw Self Center) is even better. And they might even be more rigid than a 3SC assuming you get full contact on all jaws. But can you?

According to Wobbly Table Theorem you can always get a 4 legged table to be stable by rotating it. But that assumes point contact, while chuck jaws are anything but. So it might be worth a shot when working with one, but it's no argument for choosing it over a 3SC.

As mr Rimmer points out, if they were that superior we would have seen more of them by now. A 3SC is the obvious all-round choice. It will hold almost any shape reliably, and even cheap Chinese chucks can hold 0,03mm or better when new. Anything will wear in time, and cheap stuff tends to wears fast. But 9 times out of 10 they are the simplest solution by far. A 4IA will do anything the 4SC will do and a lot more.

Having a loose fit on the back plate is a simple fix for a loose chuck, but with a new chuck one should obviously try a slip fit first. You can always remove more metal later, adding it back is a bit more work.

Does this help?

**LINK**

I'm very happy with my Creality CR6, especially the auto-level function.

@Duffer: Your data for M6x0,5 and M6x0,75 is right. If you do the math it's the major diameter minus the pitch. A metric thread with no pitch designation means "standard coarse thread" which for M6 is 1mm pitch. So the correct drill diameter for M6 is 5.0mm.

The depth alone is unlikely to be the main issue, I've tapped to the full length of the tap many a time without any issues. But if the hole is crooked it's going to bind up as you go deeper.

5mm is the right drill for M6, that's what I use 99% of the time. I might use 5.1 on difficult materials.

The hole could be crocked, a dull or poorly centered drill can wander off significantly.

Afaik you can't use thread dials when cutting imperial on a metric (or visa versa). Personally I've never bothered with them for metric.

I suspect they would handle 5V just fine, making USB power a viable option. 3D printing a replacement battery lid shouldn't be too hard.

i believe all European countries use "time correction" these days, meaning the average frequency will be constant. This keeps watches with synchronous motors correct with no manual correction needed.

@ Andrew: True, but I don't have to both stop the feed and reverse the slide at the same time. I don't know if my track record is better than with the automatic feed, but the illusion of control is worth it.

The quality of the tooling matters of course. I use cheap tooling in a cheap machine (Chester Crusader type), I suspect the aluminum headstock has too much flex.

My problem with parting under power is that sooner or later there will be a slight growl. And unless you back off immediately there will be a loud and expensive bang.

The problem with ChatGPT is that it can talk, it just doesn't know anything else. In a sense it's like a incredible lossy compression of the internet. It can reproduce something that looks like a "reasonable internet reply" when it comes to language, vocabulary, sentence structure and so on. But it doesn't actually know anything so the answer can often be both perfectly believable and positively wrong.

Combining ChatGPT with Wolfram Alpha sounds like a good idea, but I also think we are jumping to conclusions based on very simple "tricks". It's not intelligence, just very clever pattern matching.

Wow, I'm impressed

I raised my lathe 4 or 6" by bolting a H-beam to the legs. It's not bolted down, so it was a simple fix. The foot brake is a bit high, but I don't have to hunch down while working anymore. Well worth the effort IMHO.

Huh, that is interesting. None of the sources I've seen mention this, and no other common Cu-alloy behaves like that. But you can't argue with empirical evidence.

I successfully trepanned for the first time, a 5mm deep groove in steel. The last two attempts ended with a loud bang, so I was pretty much s*tting bricks the whole time.