Proud to be Canadian song

[Mcgyver]

Really? 400?

@Martin w - Typically, I go as slow as I can on a 1" or bigger shaft. That's 70 rpm. I assume steel. For harder steels I wish I could go slower.

Gunna have to try faster next time as per @DPittman's advice.

4x CS / Dia = 400 .... drilling, turning milling...... optimal cutting speed for Hss and mild steel is 100fpm. Slower is fine, and a bit faster won't cause an explosion ..... it's just the point where tool wear vs the material removal rate is no longer linear.

 

[Susquatch]

It might be worth looking at content/parts too. I'd venture an educated guess that we are ahead on that front vs the USA but behind vs international. If you don't, I will try to do that later today.

@FatherWes - the auto parts situation is not good. For 2023:

Auto parts imported to Canada were 47.5B. Of that, the parts imported from the US was 30.9B. And from international was 16.6B.

Total Auto parts exported from Canada were 23.5B. With 22.3B going to the USA and only 1.2B going to the rest of the world.

In other words, from an automotive perspective, Canada's vehicle production and sales are pretty well balanced vs the USA. But we are behind by about 1/3 on parts with the USA and way behind vs Mexico and overseas. Quite a different perspective than I expected. A lot has changed since I retired.

 

[Susquatch]

4x CS / Dia = 400 .... drilling, turning milling......

That's for cutting. I always thought that forming (pressure knurling - not cut knurling) required lower speeds.

I know that you do a lot of cut knurling. I'd expect that to be the same as other cutting operations. But it would be good to know which one you meant.

If you are right and that applies to pressure knurling, it makes life easier since it's all the same.

 

[YotaBota]

 

[FatherWes]

@Susquatch
Thanks for those data.

 

[Mcgyver]

That's for cutting. I always thought that forming (pressure knurling - not cut knurling) required lower speeds.

I know that you do a lot of cut knurling. I'd expect that to be the same as other cutting operations. But it would be good to know which one you meant.

If you are right and that applies to pressure knurling, it makes life easier since it's all the same.

My mistake, I missed that we were talking knurling <insert crazy dingbat smilie>

 

[Susquatch]

My mistake, I missed that we were talking knurling <insert crazy dingbat smilie>

Ah I see. That explains it. I did a bunch more research and the majority of what I found recommended much slower speeds for pressure knurling than regular cutting speeds primarily because of the much higher heat generated when forming metal and its effect on tooling and formed material.

I'm gunna try @DPittman's higher speed recommendations anyway - just for Shits N Giggles. I have always believed one should try these things rather than just blindly following rules.

 

[Martin w]

Ah I see. That explains it. I did a bunch more research and the majority of what I found recommended much slower speeds for pressure knurling than regular cutting speeds primarily because of the much higher heat generated when forming metal and its effect on tooling and formed material.

I'm gunna try @DPittman's higher speed recommendations anyway - just for Shits N Giggles. I have always believed one should try these things rather than just blindly following rules.

I always treated knurling the same as threading. Slower and lots of oil.
Martin

 

[Dan Dubeau]

I've always run knurling faster, as it's a forming operation, and some inertia helps. Not fast like turning, but not slow like threading. If you draw parallels to blacksmithing, It would be like simply pressing on the steel with a 2lb hammer, vs hitting it. You need some momentum to get things moving, or the forces required get pretty high. That being said, it's one of those things you can make work a bunch of different ways, and everybody has their preference. As I have mine. Set the tool depth, and traverse once. I have never tried cut knurling. Would like to though....

 

[Susquatch]

I've always run knurling faster, as it's a forming operation, and some inertia helps. Not fast like turning, but not slow like threading. If you draw parallels to blacksmithing, It would be like simply pressing on the steel with a 2lb hammer, vs hitting it. You need some momentum to get things moving, or the forces required get pretty high. That being said, it's one of those things you can make work a bunch of different ways, and everybody has their preference. As I have mine. Set the tool depth, and traverse once. I have never tried cut knurling. Would like to though....

That's a good point Dan. It has never been a problem on my lathe. It would move mount everest in low gear. A smaller lathe might be a much bigger issue. It will be a monster with a VFD.

A cut knurler is on my project list too. I LOVE the way cut knurling looks.

 

[Chicken lights]

How did we start an off topic post about a satirical song and thread drift to machining??? You guys are doing it backwards

 

[DPittman]

How did we start an off topic post about a satirical song and thread drift to machining??? You guys are doing it backwards

I figured that was the intent of Martins' original post, so that's why I gave a rather succinct answer.

 

[mcostello]

Proud Mary keeps on turning. At least in MY song.