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Hi Bob,

As good and long-lasting an oil as Commonweath 244 is, 10 years old is likely way past its prime, even if you don't do a lot of roughing. It's good that you keep the oil clean with regular...

clittle,

If you only need one such part, then stick with laser or the like. If you need a lot of these, wire EDM can very accurately cut stacks of these with little regard to kerf width...

I agree with jonkka on this and I'm sorry I failed to mention this in my earlier post. When drilling copper (or any soft material, as jonkka has accurately pointed out), you should "lip" the corners...

Bowhunter,

Keep the part COOL! Copper readily conducts heat and as you drill deeper, the part expands (from heat) and pinches the drill body and causes bad things to happen as you describe. I'd...

Don't know what grade of copper you are milling, but Rusty is correct, you must manage heat build-up or the chips will quickly weld to the cutter and ruin your finish and size. Use dead-sharp end...

I agree with fkaCarel about the 400 series. When a higher hardness in a stainless steel is needed, 440C is used. With its higher carbon content, (approximately 1% compared to about .4% carbon in...

I agree with Hu with one addition... before welding, make certain that the blade ends are square to each other. To do this, put a half-twist on the blade before grinding (one side has teeth, the...

It is an acquired skill called "offhand" grinding and is as difficult to explain as it is to master. It is best learned by seeing it done, otherwise, head for the Cuttermaster.

Bud

Things may have changed since I was cranking handles, but when I was on the bench, almost all of my mold work (and everyone else's in the shop) was done from center, whether it was a mold base or an...

I was fortunate enough to have taken 3 years of double-period, Machine Shop in high school where we had about two dozen lathes, mills and grinders and a brass and aluminum foundry. We were taught by...

Anybody here made molds for toothbrushes? Curious about the process, moreso the addition of the bristles. Appreciate anybody shedding some light.

Hi Paul,

I believe all tufts are auto-loaded...