Cutter Engineering

Engineering coursework help about milling machines ?

Parameters
Depth of cut and cutter type for roughing and finishing cuts
Position of workpiece – datum point
Safety cut out
Guards

Information and explanations regarding these?

Thank you for your help people

I am guessing your are talking about a CNC mill?
I have no experience with one, although I wish I did.

On a manual mill, for a datum point, I use an edge finder and locate the left hand edge of the
Stationary jaw on the milling vise.

Once located, I zero out the X axis Digital Read Out / DRO.
Then I lower table till the edge finder will clear the top of the vise jaws,
move the table to the left 1/2 of the edge finder diameter.
Then zero out the X axis display again.

This makes the left hand corner on the stationary vise jaw X = 0.000

I do the same thing for the inside edge of the same vise jaw to make Y = 0.000

Most work pieces I work with, fit into the vise.

My DRO map/ drawings are based on the top left hand corner on the work piece.

For round work like bolt circles, I work off of the center point of the work piece.

That work piece is lightly center punched, clamped to the mill table and a pointed
edge finder is used to locate the circle center.
The X and Y axis on the DRO are then zeroed out to make the center point of the
work piece X = 0.000 and Y = 0.000

For depth of cut, a lot depends on the physical size of the mill,
the physical condition of the mill,
the rigidity of the clamping of the work piece,
available mill horse power,
size of the cutter/ diameter,
number of flutes on the cutter,
what I am using for coolant.
what material the work piece is made of/ steel, aluminum, exotic

A good rule of thumb is depth of cut to not to exceed cutter diameter.
This can vary again by all the above mentioned items.

For the traveling speed of the milling cutter, I do the math and try to keep the chip
thickness to 0.010 inches or less.

Safety cut out, the mills I have worked with are all world war two or earlier and do not
have a safety cut out.

Guards are usually just clear PVC plastic. I prefer guards made of clear lexan as
they are less prone to breakage than PVC plastic.

Guards are primarily to keep the coolant and chips from going on the floor.

For depth of cut, here is a Google search that contains much information.
Google search for [milling cutters, depth of cut]

http://www.google.com/webhp?sourceid=navclient&ie=UTF-8#hl=en&source=hp&q=milling+cutters%2C+depth+of+cut&btnG=Google+Search&rlz=1R2GZAZ_enUS364&aq=f&aqi=&aql=&oq=milling+cutters%2C+depth+of+cut&gs_rfai=&fp=25bac56246434a91

For milling machine guards
[milling machine guards]

http://www.google.com/webhp?sourceid=navclient&ie=UTF-8#hl=en&source=hp&q=milling+machine+guards&rlz=1R2GZAZ_enUS364&aq=0&aqi=g5g-m3&aql=&oq=milling+machine+g&gs_rfai=&fp=25bac56246434a91

[tutorial milling machine workholding]

http://www.google.com/webhp?sourceid=navclient&ie=UTF-8#hl=en&rlz=1R2GZAZ_enUS364&ei=2JG0S_ehE4TINd7HkOwJ&sa=X&oi=spell&resnum=0&ct=result&cd=1&ved=0CA4QBSgA&q=tutorial+milling+machine+workholding&spell=1&fp=25bac56246434a91

[tutorial CNC mill datum point]

http://www.google.com/webhp?sourceid=navclient&ie=UTF-8#hl=en&source=hp&q=tutorial+CNC+mill+datum+point&btnG=Google+Search&rlz=1R2GZAZ_enUS364&aq=f&aqi=&aql=&oq=tutorial+CNC+mill+datum+point&gs_rfai=&fp=25bac56246434a91

[tutorial CNC mill workpiece positioning]

http://www.google.com/webhp?sourceid=navclient&ie=UTF-8#hl=en&rlz=1R2GZAZ_enUS364&q=tutorial+CNC+mill+workpiece+positioning&aq=f&aqi=&aql=&oq=tutorial+CNC+mill+workpiece+positioning&gs_rfai=&fp=25bac56246434a91

I hope this enough information for you, feel free to email me.
This link will take you to my Profile Page;

http://answers.yahoo.com/my/profile;_ylt=At4whSUBlf4jc99McgHtxrjsy6IX;_ylv=3?show=arAcdUdgaa&preview=true

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Is there any possibility that terrorists could have wired the twin towers with thermite cutter charges . . .?

aswell as using the planes? As a structual engineer for 26 years.
I know that the diffuse flames caused by burning jet fuel along with other building materials is not enough to melt structural steel supports. The world trade center fires with the perfect air to fuel ratio would have peaked at 1000dg celsius.

The structual steel supports would need at least 1500dg celsius
to explain the molten metal that much of the steel members were
turned into?

Thermate not thermite charges with their own o2 supply will melt steel girders like butter .
Its the only explanation this is fact look it up.
Somthing else troubling me is the fact that all three buildings fell as the result of planned demolition, ask any demolition expert or engineer. Buildings do not fall that precisley no matter how many planes you fly at them or from what angle? its just not possible physics wont allow it !

So why aren't the CIA investigating who planted the demolition charges?

You should know, AS A STRUCTURAL ENGINEER, that steel has a melting point at about 2750 degrees farenheit.

You should know, AS A STRUCTURAL ENGINEER, that steel loses half of its strength at about 1100 dg farenheit, and at 1800 dg F it loses about 90% of its strength.

Jet fuel does not burn hot enough (800-1500 dg F) to MELT the steel, and the towers did not come down because the jet fuel melted the steel. The jet fuel burned off in a matter of minutes, but it was the ignition source for other combustible material, that heated the steel enough to weaken it and cause the structural failure. Official investigation reports that pockets of the rubble were burning at about 1832 dg Farenheit.

AS A STRUCTURAL ENGINEER, you should also know that a "pancaking" EFFECT is the result of structural failure of the floor support system, and can be caused by many forms of structural catastrophe, including weakened support by fire, physical damage, etc. The CAUSE of those things can be planes slicing through steel, fires, and yes demolition teams destroy support systems to bring down buildings as well.

Just because the effect is the same doesn't mean the cause is the same. Of course, you already knew that because YOU'RE A STRUCTURAL ENGINEER, right?

AS A STRUCTURAL ENGINEER, you should know how the towers were constructed and study the report before you make conclusions agreeing with a conspiracy theory.

Do your homework with facts, not conspirasites. It will serve your career better.