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Old 11-04-2012, 10:02 PM   #11011
Road Rash
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Originally Posted by MortimerSickle View Post
If Bob's Vendor Sale gets any smaller, he is going to have to Bump some of his regular stock.

Yeah, they are nothing like they were 10 years ago, but I do still like going to them (missed this one, was out of town), as there are some good deals to be found..........................and lets not forget about those tasty hotdogs for breakfast
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Old 11-05-2012, 01:25 PM   #11012
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A. take bigger cuts
B. use a different chip breaker
C. increase your feed rate

D. all the above!

and get a frikken chip hook, your hands should be in your pockets while your machine runs,,not fucking around with stringy razor blades moving 30 mph!
If you are getting long strips, you are getting bad instruction.


what diameter were you turning?
What material?
what tool type?
what was your feed rate?
Chips should come off the tool white, then turn blue, not blue directly off the tool.

Anyway,, at least it's yer throttle hand,,,
at least you don't have to work the clutch with them gashes,
,can you still skweez the brake with the remaining intact fingers?

HellYeah,,yer good to ride!


sounds like it was DOM. slow down the rpm kick up the feed...and itto. make a freakin chip hook.
never ever! get your idjuts near straw. lucky it did'n just pop them two clean off.
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Old 11-05-2012, 05:33 PM   #11013
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how is slowing down the rpm and speeding up the feed going to prevent the straw? straw simply coming out slower and more manageable? right now we cut at @ 600 rpm. they won't let me near my lathe for awhile to test the theory. and we have a hook...
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Old 11-05-2012, 05:52 PM   #11014
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how is slowing down the rpm and speeding up the feed going to prevent the straw? straw simply coming out slower and more manageable? right now we cut at @ 600 rpm. they won't let me near my lathe for awhile to test the theory. and we have a hook...
um...at DOM should be about 285 at a 4-5" range and feed should be + .o12 /.022 or no matter what it will make straw. A2.

slower rpm and faster feed makes chips. it's all about the alloy. learn them.. dom is hell to make chips but treat it like 4140 and it can be done. ;
first off. get your fucking fingers out of there.
second. deal. make a chip hook.
get a book. or a mentor in the shop.
learn what alloy cuts like what, learn the colors, learn what the chip weld /wear looks like on the tooling.
do the math. it takes seconds. there is no excuse to get bit by straw. thats a rookie mistake.
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Old 11-05-2012, 06:48 PM   #11015
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what book? and I already have a hook-my mentors at this shop are only going by the ways it's always been done there
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Old 11-05-2012, 09:55 PM   #11016
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Old 11-05-2012, 10:22 PM   #11017
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Originally Posted by linkweewee View Post
what book? and I already have a hook-my mentors at this shop are only going by the ways it's always been done there
that is why I say you are getting bad information,
You are in a somewhat higher tech shop,,
someone has dealt you the wrong tool for the job,"cuz that's the way they always done it",,stupid!
lose fingers, or learn tooling.
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Old 11-05-2012, 10:47 PM   #11018
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Puke

"We always done it that-a-way..."
Bad philosophy, like expecting different results from the same action.

Yeah. "Like"

Careful bucky.
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Old 11-06-2012, 01:36 PM   #11019
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Ouch!

Sorry to hear about your injury, Steve.

I wish I knew anything about machining. Sounds like you need Darin and Peter's tutelage.

Be careful, those stitches are gonna really mess up your current sex life.
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Old 11-06-2012, 02:11 PM   #11020
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Ouch!

Sorry to hear about your injury, Steve.

I wish I knew anything about machining. Sounds like you need Darin and Peter's tutelage.

Be careful, those stitches are gonna really mess up your current sex life.
maybe he likes it rough...

I know one thing. them type a cuts hurt like a motha... even the little ones...and they will get infected. and then they'll really freakin hurt.
the relief of draining puss is nothing like the release of draining pipe. but damn close. and that shot a PenG hurts like a mofo. make ya walk funny kinda hurt.
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Old 11-06-2012, 07:13 PM   #11021
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um...at DOM should be about 285 at a 4-5" range and feed should be + .o12 /.022 or no matter what it will make straw. A2.

slower rpm and faster feed makes chips. it's all about the alloy. learn them.. dom is hell to make chips but treat it like 4140 and it can be done. ;
first off. get your fucking fingers out of there.
second. deal. make a chip hook.
get a book. or a mentor in the shop.
learn what alloy cuts like what, learn the colors, learn what the chip weld /wear looks like on the tooling.
do the math. it takes seconds. there is no excuse to get bit by straw. thats a rookie mistake.
whats up with all the Greek? Repost in English please?
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Old 11-06-2012, 07:15 PM   #11022
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it doesn't hurt at all

having the "talk" with my shop foreman tomorrow

my defense will be the piss-poor training I got when they put me on a lathe for the first time in my life 4 months ago
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Old 11-06-2012, 07:21 PM   #11023
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want me to be there to stand beside you?

does the "boss" make long stringy razor blades when he turns a cylinder?
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Old 11-06-2012, 07:26 PM   #11024
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want me to be there to stand beside you?

does the "boss" make long stringy razor blades when he turns a cylinder?
what's funny is that I talked to 3 different machinists today and each had a different answer and the one who made the most sense was the old guy-was the same answer you and Dagweed put forth. our old guy said take 1200 and divide it by the diameter of the cylinder and that is the general rule for cutting rpm. I was cutting every size at 600 rpm no matter what the OD or wall thickness
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Old 11-06-2012, 07:56 PM   #11025
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whats up with all the Greek? Repost in English please?
Hmm,, I understood all of it,,seems normal to me!

He didn't mention chipbreakers though,,I like a CNMG 433 or a TNMN 432 for softer stuff.

DOM = drawn over mandrel,, it is a method of forming seamless tubing, suitable for hydraulic cylinders, and all kinds of good machine stuff.
The 285 refers to a cutting speed, which can be described in RPM for a known element, or in SFM, or surface feet per minute.
Different materials have varying cutting speeds, for example, aluminum being about 3 to 4 times that of steel,,ah! but which steel?
Here Dagwood makes reference to carbon content and alloys such as nickle or manganese which will make machining tougher to accomplish, and the machinist's need to know these inherent traits to adjust speeds and feeds accordingly. EVERYTHING ABOUT CUTTING METAL IS ABOUT SPEEDS AND FEEDS!
Lets say for comparison that you have a bunch of 2" diameter shafting in different grades of steel, 1018, 1045, 1080, 4140,,and so on. If you set the rpm and feed rate exactly the same, some will form chips, and other materials will form long dangerous stringy razor blades,and some may gall, or 'glue' themselves back to the parent material.
Then enters in the cutting tool you are using, and the material it is made from. Old cutting tools were made from high carbon steel, like a file, and too much speed will dull them soon thru heat. (the same is true for any cutting tool)
High speed steel is a step up from the old old days, and is the basis for standard cutting speed assignments. Mild steel shafting or plate being cut with a high speed steel tool has a cutting speed of sixty.
To determine the rpm of your lathe or milling head cutter, multiply the cutting speed by 4, and divide by the diameter you are cutting,,(3" shaft, or 3" diameter cutter)
Modern carbide cutters increase cutting speeds by about 4 times,much more in some cases!
Then,, the attitude of how aggressively to feed or engage the tool is a whole nuther chapter, and you'd have to be here with enough beer to keep me interested in explaining all the stuff that is in the basics.
Oh,, and "The Book" Dagwood mentions is one every red blooded male who imagines himself as any kind of "real man" should have sitting on his shelf.
Machinery's Handbook,,any edition.
There is enough reading in there to hold your fascination about all the things you never knew,for YEARS!,,,all good!
And if you actually DO want to know something,,it is in there!
(how much weight will a screw hold in white oak?)
Now I'm not saying that if you do not have this book, that you are not a manly man,,,,,,


just a lot less of one,,,get "The Book"!
Yo Brother Dags,,did I skip anything besides tool radius?
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