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I've been machining for a living here in the USA for 21 years, and haven't encountered the terminology "slot drill". The cutting tool suppliers sell "endmills" and "center cutting endmills". You use the latter if you're plunge cutting unless you're following a pilot hole. And if you're...

I posted in a forum without realizing it was for people with physical disabilities. (I thought "disability" referred to a lack of SKILLS.) People viewed the thread, but didn't respond. II tried to delete my comments, but the site expected me to leave something.. So I typed "deleted post"...

I posted in a forum without realizing it was for people with physical disabilities. (I thought "disability" referred to a lack of SKILLS.) People viewed the thread, but didn't respond. II tried to delete my comments, but the site expected me to leave something.. So I typed "deleted post"...

Just for the reference... If you are concerned about the lead in leaded steel, you can get 12T14, a free machining steel with tin in it. Very hard to find though. I got a sample years ago. Was from a company in Canada I believe.

I was away from this thread for a long time due to family issues. My apologies for abandoning the thread without thanking everyone. Thank you.

So sorry for you. I'm saying a prayer for you right now, that if it is God's will, he heal you, or if not, that you don't suffer needlessly. I'm certain that if heaven is the wonderful place we're told, people are not just praying and singing every day. They have hobbies, and can enjoy them.

Deleted post.

I don't think most people know most of the small threaded fasteners used in electronic devices, watches, etc. used to be made of leaded steel, precisely because it machines so well, including the fine pitch threads. McMaster sells 12L14, and 41L14 "free cutting" steels. The latter is as easy...

Thanks. That was a fallback position for me. Problem is, I have never mastered silver soldering with a propane torch. I did some silver soldering working for a job shop 28 years ago. They used something they called "Easy Flow". I bought some a couple years back. Silvery wire about 1/16"...

Pull the datasheet on most any tool steel, and the accepted "procedure" calls for a furnace, special quenchants like salt baths or cyanide, very controlled timing, etc. I have to work with what I have available, and that's a propane torch. I experiment. I've been very successful through...

Are you wedded to plumbers solder? The modern stuff (legal to use in water lines) has antimony and other elements in it, that in my opinion, makes it much more difficult to use than leaded solder. Of course these days, it is difficult to find leaded plumbers solder. You can still easily...

I work with leaded steel a lot. It has spoiled me. I don't want to cut anything else. It doesn't rust that fast, if the surface finish is fine.... And besides, your cylinder is going to be lubricated, is it not?

Wondering if anyone here has done any machining and hardening of HSS like M2 or M4. I've never worked with the stuff. It's expensive, so I'd rather not invest the money, if it's going to be impossible with my equipment. I have an idea for a circle cutter (similar to a trepanning tool) that...

Circuit board is notorious for absorbing moisture and swelling. May not be significant for most jobs.

I like your caliper idea! Good job.

They do a nice job scoring circuit board for breaking. The blades aren't carbide. Would be nice if they were.

How much current a wire can handle depends on whether it is bundled with other wires, the thermal dissipation, the frequency of the current, etc. You don't want the wire insulation to melt. Fusing current is a totally different matter. The link below shows fusing currents for American wire...

Pretty clever solution to chattering, although I would want my hand free rather than holding the lead.

Clever, but 35 years experience in the electronics industry tells me that circuit board is never very consistent on thickness. It is, after all, a product made from layers of glass fiber and epoxy.

The old timer suggestion for cutting brass and copper was to use bacon grease or milk. Yes, I said MILK on the softer stuff. I have never had the chance to verify how well it works, because I don't come in contact with much brass. Your hole sizes are pretty small. Any depth over 5 to 7 x...