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Posted by JRWheels on July 13, 2008, 7:41 pm
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I intend to take the results of this quiz further on to explain some
of the newer cutters on the market so we can all understand the
concept of why they work so effectively, making you more competitive,
saving you money and possibly your business. So have some fun with
this one. If you like this stuff I can keep them rolling in here.
There is nothing intended to be tricky or hidden, simply doing the
math properly to ensure the tooling is cutting properly.
Start of Quiz:
You have a job come across your desk to quote. It is 1018 steel, not
difficult to machine. The part is 3=94 wide, 1=94 thick and 12=94 long.
There are 2 features to machine in it.
Feature # 1 is a .750=94 wide, Flat Bottom Channel that is .0215=94 deep
and it runs the complete length (12=94) of the part. A Standard Flat
Ended Endmill is to be used.
Feature # 2 is a Full Radius Channel, designated as a 3/8=94 radius, it
also is .0215=94 deep and runs the complete length (12=94) of the part. A
Standard Ballnose Endmill is to be used.
Both of the Endmills you have available for this job are 4 Flute,
Carbide, Stub Flute Length, Coated tools.
The Tool Manufacturer for both of the Endmills you are using suggests
you use 500 SFM for this material and a chipload of .002 Feed Per
Tooth.
What would be the total Time In The Cut (not including rapid
positioning moves) for both of these tools combined to machine both of
these features in the part?
Multiple Choice Answers:
A. Less than 35 Seconds
B. Between 35 and 44 Seconds
C. Between 45 and 50 Seconds
D. More than 51 seconds but Less Than 1 Minute
E. More than 1 Minute
If you want to explain your math behind the answer feel free to do
so.
Again, have fun with this.
JR
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Posted by vinny on July 13, 2008, 8:43 pm
Please log in for more thread options
I intend to take the results of this quiz further on to explain some
of the newer cutters on the market so we can all understand the
concept of why they work so effectively, making you more competitive,
saving you money and possibly your business. So have some fun with
this one. If you like this stuff I can keep them rolling in here.
There is nothing intended to be tricky or hidden, simply doing the
math properly to ensure the tooling is cutting properly.
Start of Quiz:
You have a job come across your desk to quote. It is 1018 steel, not
difficult to machine. The part is 3” wide, 1” thick and 12” long.
There are 2 features to machine in it.
Feature # 1 is a .750” wide, Flat Bottom Channel that is .0215” deep
and it runs the complete length (12”) of the part. A Standard Flat
Ended Endmill is to be used.
Feature # 2 is a Full Radius Channel, designated as a 3/8” radius, it
also is .0215” deep and runs the complete length (12”) of the part. A
Standard Ballnose Endmill is to be used.
Both of the Endmills you have available for this job are 4 Flute,
Carbide, Stub Flute Length, Coated tools.
The Tool Manufacturer for both of the Endmills you are using suggests
you use 500 SFM for this material and a chipload of .002 Feed Per
Tooth.
What would be the total Time In The Cut (not including rapid
positioning moves) for both of these tools combined to machine both of
these features in the part?
Multiple Choice Answers:
A. Less than 35 Seconds
B. Between 35 and 44 Seconds
C. Between 45 and 50 Seconds
D. More than 51 seconds but Less Than 1 Minute
E. More than 1 Minute
If you want to explain your math behind the answer feel free to do
so.
Again, have fun with this.
JR
you said in the subject line to quote this job.
3hrs setup...20 mins a piece run.
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Posted by BottleBob on July 13, 2008, 8:46 pm
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JRWheels wrote:
> There is nothing intended to be tricky or hidden, simply doing the
> math properly to ensure the tooling is cutting properly.
>
> Start of Quiz:
I just sent my answer to Jim.
--
BottleBob
http://home.earthlink.net/~bottlbob
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Posted by Proctologically Violated®© on July 14, 2008, 12:23 pm
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>
> JRWheels wrote:
>> There is nothing intended to be tricky or hidden, simply doing the
>> math properly to ensure the tooling is cutting properly.
>>
>> Start of Quiz:
>
> I just sent my answer to Jim.
So, what, you never let people copy off you in grade school????
Sheesh........
--
------
Mr. P.V.'d (formerly Droll Troll), Yonkers, NY
Sodomized by Congress, butt again...
But, Obama at least took me to the hospital!
entropic3.14decay at optonline2.718 dot net; remove pi and e to reply--ie,
all d'numbuhs
>
> --
> BottleBob
> http://home.earthlink.net/~bottlbob
>
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Posted by BottleBob on July 14, 2008, 3:32 pm
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Proctologically Violated®© wrote:
>>
>> JRWheels wrote:
>>> There is nothing intended to be tricky or hidden, simply doing the
>>> math properly to ensure the tooling is cutting properly.
>>>
>>> Start of Quiz:
>> I just sent my answer to Jim.
>
> So, what, you never let people copy off you in grade school????
> Sheesh........
PV:
Ahhh, but when you copy from someone else you're never really sure if
who you're copying from is correct or not.
Since Jim has posted the answer and explanation, here was what I sent him:
==================================================================
Jim:
Well, tool #1 RPM = 3.82 X 500 SF / .750 or 2546 RPM
IPM = .002 X 4 teeth X 2546 RPM or 20.4 IPM
So adding .5 on each end of the bar to clear the 3/8" radius of
the end mill should give a 13" length. 13" / 20.4 IPM = .64 min. or
38.4 sec.
Tool #2 Would be .750 ball end mill. But being that the dept. is
only .0215 the width of cut would be c = 2 X square root of h(2r-h) or
.2503. So RPM = 7640 IPM = 61.12 Starting off and finishing off the
bar by .250 on either side, the length would be 12.5 / 61.12 IPM or
.205 min. or 12.3 sec.
So adding 38.4 sec. and 12.3 sec I get 50.7 sec. So my answer
would be "D".
Now IF the tool centerlines were started ON the 12" bar length the
times would be: 12"/20.4 = .588 min. or 35.28 sec. And 12"/61.12 =
.196 min. or 11.76 sec. 35.28 + 11.75 = 47.03 sec. or "C".
==================================================================
After sending that to Jim, I looking at his list of multiple choice
answers more closely and a saw I had made an error. So I sent the
following addendum:
==================================================================
BottleBob wrote:
>
> So adding 38.4 sec. and 12.3 sec I get 50.7 sec. So my answer
would be "D".
Opps, 50.7 seconds is less than 51 seconds, so BOTH of my answers
would be "C".
==================================================================
After sending that addendum, I looked at his multiple choice answers
AGAIN and saw that there was STILL an error. So I sent the following
(I've just now added a copy of his original multiple choice list).
==================================================================
Jim:
There's an anomaly in your answer list. My first answer of 50.7
is MORE than "C" and LESS than "D". LOL
Multiple Choice Answers:
A. Less than 35 Seconds
B. Between 35 and 44 Seconds
C. Between 45 and 50 Seconds
D. More than 51 seconds but Less Than 1 Minute
E. More than 1 Minute
==================================================================
You see how convoluted things can get? And YOU want to copy from ME?
LOL
Also, you can see how handy saving E-mails and posts to an accessible
"SENT" folder can be now, right? <g>
--
BottleBob
http://home.earthlink.net/~bottlbob
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> math properly to ensure the tooling is cutting properly.
>
> Start of Quiz: