tonight I felt like a machinsit for the 1st time

[cuemaker]

I have had some serious issues with parting. Vibration, squealing, broken tooling.

Someone posted a link somewhere showing BBC videos, and alot of had to do with grinding tooling and the effects of the correct angles on the tooling and the way it cuts.

I learned quite a bit.

So I re-ground my cutoff tool, and damn, it cut like butter. I even felt so confident that I put the auto feed in, on the slowest feed rate, spay every now and then with wd-40, and I got one continuous ribbon while parting. No squeal, no pulling in on the tool, no vibration.

Damn felt good.

And after receiving some help from Mark Costello, I was able to cut threads accurately for the first time tonight and put to use the part I made with those threads!!

A very inspiring night for me.

[tattoomike68]

It sure is nice to hear you have the self confidence and problem solving skills to keep after the hard parts till you have done what was a nightmare in the past.

I am happy for you.

after about 10 years as a machinist I made a fixture for a tool and die makers wire edm in some rock hard 304 stainless and held <.0002", I was as happy as you are.(it was hand scraped, surface ground too, filed,I broke a .500 carbide end mill, I broke 2 taps on 3 holes, drilled out a broken tap, it took 15 hours to make the fixture)

some days you feel you pulled off a miracle.

It just gets better and better every day

dont surface grind 304 stainless, what a pain.

[This message has been edited by tattoomike68 (edited 07-03-2005).]

[vinito]

Good job cuemaker. Sounds like you had a good day.
I had the other kind of day today.
I was making good time and things were going nice & smooth (making a replacement part for a friend's mill). The last operation before parting off was cutting acme threads. That was going fine too. I've single-pointed tons of threads over the years. Well I had the bright idea of smoothing down the O.D. burr before making a couple spring passes. I kicked out the feed gears so I could wind the RPM up for the filing...
Yep. I didn't bother checking. Dummy me forgot that the timing would be off after that slick move so my spring passes were (of course) now centered on the crest! One stupid move. I know better than that... normally.

Oh well. Went smooth up to that point so only wasted about a half-hour. At least I didn't scrap the part after wrestling with it for two hours. Must be all that fireworks smoke in the air - gotta blame it on something, right? I'll do it over tomorrow.

Tuition

[Your Old Dog]

You're right, it feels great to stop screwing something right and get it to work. I felt the same as you when the auto infeed produced one long chip! Because of something one of the veterans said on this board, I just recently tapped my 20th or so hole with the same tap and it still ain't busted and stock in a chunk somewhere! All the guy said was "in my experiance, going in crooked breaks more taps than anything else" Guess that was my problem!

If you can find the video link you spoke of maybe you can cut and paste it into the thread. It might help some of us.

Ray............

[machinist1964]

Your Old Dog.....

I had the same problem with tap breakage, then a machinist friend showed me something useful. He had a squared up piece of clear plastic, about 1" thick. He had several holes drilled through it. He would place the plastic block over his drilled hole and use the hole in the plastic block to guide his tap straight. Each hole fit a different size tap. I made one that day. If I have to tap by hand, I always start the tap using my tapping block.

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[This message has been edited by machinist1964 (edited 07-03-2005).]

[ricksplace]

Cuemaker -Good for you! I admire your perseverence. I still remember the first time I cut threads. I had a machinist friend coach me, and I was still sweating bullets.

Rick.

[Your Old Dog]

Machinist, thanks a lot! I have some 1 inch acrlyic and will have one together before noon! That means I can work off the lathe! I was using the tailstock to anchor the back of the tap.

I wonder if something similar to that could work for using the hand-drill. Make a brass tube to fit over the bit and then slip it into a jig like you described. Maybe a spot of oil to keep heat down? Dragging that drill press around to get plumb holes is a bear

Ray.......

[Paul Gauthier]

Cuemaker
well done, it does feel good when you do something right, and it gets easier as you go along.

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Paul G.

[wierdscience]

Yep,now your really addicted

[cuemaker]

Thank you all for the kind words. Yes, success sets the hook deeper.

The link is:

http://www.me.gatech.edu/jonathan.co...mfgvideos.html

There is whole section on machining.

[Wirecutter]

<font face="Verdana, Arial" size="2">Originally posted by cuemaker:
Thank you all for the kind words. Yes, success sets the hook deeper.

The link is:

http://www.me.gatech.edu/jonathan.co...mfgvideos.html

There is whole section on machining.</font>

Geez, Cue. There went another hour as I went through all that. At 27Meg, the demo video for the McLaren F1 was something else. It makes me want to go steal a million bucks so I can go buy one.

That link is a bookmark for me, alright. Thanks.

-M

[JRouche]

The tubebending vid is 103meg. Actually took a couple minutes to download it. Thanks for the link Cue. JRouche

[cuemaker]

my pleasure guys, the cutting tool geomotry with the slow mo on the cutting action was a big help to me.

I particulary enjoyed the Honda commercial (first link)

It seems to have quite a bit on there. And for the newbie, a chance to see and learn new stuff.