Thread: New hire confuses SFM and IPM!

LOL. I guess I should have quizzed hem a bit more on the various acronyms used in a machine shop.

Prior to my dentist appointment, I told him to program the Ø.421 HSS drill @ 40 SFM (4140 @ Rc32-36).
I come back from the dentist to find "MR SLAMMY" has visited my shop.
Instead of the 362 RPM @ 2.1 IPM I expected to see in his program, he has 40 IPM programmed.
He told me "I thought the drill was making some funny noises, so I stopped it" Gee, ya' think????

My fault!
He is only out of a machining trade school about a year, and had been working full time running VMC's in a performance/ racing parts mfg.
I guess his Mastercam programming experience might have been a tad bit exaggerated.

Oh well. We have a lot of "going over things" to do tomorrow.

Doug.

Originally Posted by doug925

LOL. I guess I should have quizzed hem a bit more on the various acronyms used in a machine shop.

Prior to my dentist appointment, I told him to program the Ø.421 HSS drill @ 40 SFM (4140 @ Rc32-36).
I come back from the dentist to find "MR SLAMMY" has visited my shop.
Instead of the 362 RPM @ 2.1 IPM I expected to see in his program, he has 40 IPM programmed.
He told me "I thought the drill was making some funny noises, so I stopped it" Gee, ya' think????

My fault!
He is only out of a machining trade school about a year, and had been working full time running VMC's in a performance/ racing parts mfg.
I guess his Mastercam programming experience might have been a tad bit exaggerated.

Oh well. We have a lot of "going over things" to do tomorrow.

Doug.

The real question is what RPM did he have it at? =)

LOL he had it @ 362! WTF?

wow working for one year plus trade school and couldnt figure out 40 imp thru tool steel is way too fast. some machineist have that second sense for when shits gunna hit the fan, and others just let er fly, lol

Doug, I've seen guys that could program great toolpath, light on lifts,
and heavy on cut time, but couldn't calculate speeds and feeds to save their life.

... welcome to the 90's...

Heads up - Y2K is coming...

Originally Posted by doug925

LOL he had it @ 362! WTF?

Well, he got it half right....lol.

I went to school with a guy that wanted to program a drill @ 4 IPM on a lathe but forgot that he was still in IPR.

Originally Posted by jaymiller

wow working for one year plus trade school and couldnt figure out 40 imp thru tool steel is way too fast. some machineist have that second sense for when shits gunna hit the fan, and others just let er fly, lol

Some have that 2nd sense and just decide to duck in place of shutting the fan or removing the dung.




At least you did not get a "You Said"...
Gotta love those who sit back and wait for broken parts prior to changing the Code.

In this guy's defense, he did just start a new job. Maybe he figured something was wrong but assumed you guys knew what you were doing.

People make mistakes.

Originally Posted by Armedsask

In this guy's defense, he did just start a new job. Maybe he figured something was wrong but assumed you guys knew what you were doing.

People make mistakes.

I know. I also know that it was my fault to not verifying that he knew what I meant when I said 40 SFM.

Sheesh, I make mistakes every day, but I just thought I'd share this one.....

Doug.

40ipm would have been fine if you had tsc and enough rpm

Shouldn't sfm and ipm be some of the basics taught in machining trade school? I didn't go to trade school, but if i was teaching a machining class, it would be pounded into their heads first thing.

Can he walk upright and tie his own shoelaces?

Sounds like he learned the basics at trade school and then worked mostly as an operator at the last job. The fact that he recognized something was wrong and shut the machine down is a good sign. School is good but he is still an apprentice if he only has one year in the trade.

Originally Posted by Pattnmaker

Sounds like he learned the basics at trade school and then worked mostly as an operator at the last job. The fact that he recognized something was wrong and shut the machine down is a good sign. School is good but he is still an apprentice if he only has one year in the trade.

Agreed. Way better then some of my ex operators. "The machine did (or didn't) sound different, and the parts came out all messed up, so I put more stock in and those ones came out messed up too".

Hey..... he was just trying to make some time on that drilling op.....

You can drill a 1/2" hole in 4140 at 40 IPM. But not with anything I have in my shop...

Originally Posted by Pattnmaker

The fact that he recognized something was wrong and shut the machine down is a good sign.

Very true!

One of my last (and X) employees "...kinda thought I heard something funny..." but he kept running anyway.
FYI, the sound he heard was the rough boring bar pushing backwards through the holder about 3 inches during cut.
That happened only becasue he did not tighten (well, maybe 5 ft/lbs) the set screws holding the bar in place.
Any guesses what happened to the Ø1.5" solid carbide DNMG finishing bar?

Doug.

Originally Posted by cybergomer

I went to school with a guy that wanted to program a drill @ 4 IPM on a lathe but forgot that he was still in IPR.

Well thats a common mistake when you go from a mill to a lathe . After years of programming on the mill , I got my first lathe . So of course 4 ipm is a good starting point for a drill .
Lucky for me that the lathe control sees 4" per revolution ,and determines : wow thats way too much , I'd better e stop this sucker " . So now I know that 4ipm and .004" ipr are 2 very different things .
FBBob

Numbers are confusing.