Identify machine and work holding requirements

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identify machine and work holding requirements.

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After completing this video, you'll be able to

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identify and select an appropriate CNC machine and

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identify or define work holding device requirements.

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For this example,

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we're going to be taking a look at the HaAS

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CNC website and specifically at a VF one mill.

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While you don't necessarily have to go to the same site,

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I do think it's important that you take a look at a couple

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of different machine manufacturers websites and

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identify different parameters for each machine.

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Typically when you're planning which machine to use to manufacture your parts,

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you're going to go with whatever machines available

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in the shop environment in which you work.

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Now this could be a single machine or you could have multiple machines available

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but we want to focus on are going to be some of the specifications

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of machines and how those might affect the process of planning our machining.

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So first, with the Haas VF one,

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we can see a couple of specifications listed at the very top.

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We have a 40 taper, three axis and 8100 rpm as well as a tool capacity of 20.

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When we take a look at this,

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the 40 taper is going to determine the types of holders in which we can use.

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This doesn't limit us to using a call it

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style holder or using a shrink fit style holder,

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it just simply means that we need to have the correct taper.

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In most cases, these will be a cat 40 holder.

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The next thing is three access. Now this machine can move simultaneously in X Y and Z.

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It's a vertical milling center,

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meaning that our spindle is going to move up and down in the Z axis.

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We have an 8100 rpm limit.

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While this is a very important consideration,

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especially when thinking about our feeds and speeds for our tools.

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We should also consider things like the horsepower of the spindle.

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It's going to help us determine whether or not certain tools like

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large shell mill Can be used and the tool capacity is helpful,

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especially if we have a part that's going to require more than 20 tools.

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We should also take a look at the information listed in the technical documents

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to make sure we understand things like the orientation of the tool holder.

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In some cases a larger machine might have an umbrella style tool holder

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where all the tools are inside of the cabinet of the machine.

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Now,

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this orientation might mean that you can use larger tools

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or heavier tools than in a certain other orientation.

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So these are all things that we need to consider.

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When we're planning out our build,

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what types of tools and how many tools can our machine hold?

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What's the max spindle speed and horsepower of that machine.

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How many axes can it move in simultaneously?

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And what types of holders should we be using?

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Well, when we take a look at this,

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you'll also notice that Hospitalist specs a rotary fit, chart,

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a gallery and get info when we take a look at rotary fit chart.

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This is typically going to be used for fourth axis

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or additional types of rotary axis added to a machine.

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For our current part,

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we're not gonna be worrying about fourth or fifth axis machining.

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But as you begin to program more complex parts,

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those are things that you should consider.

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When we take a look at the specifications.

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This will give us information about the X,

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Y and Z travels as we start to plan out our parts.

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The amount of motion that the table can move in.

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X and Y and Z are going to be important considerations for our parts.

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Also note that we have a distance for the spindle nose to table.

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This max and min value is going to be

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important as well and can determine whether or not

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we have a tool that may not be able to reach our part in the fully extended position

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as we go down.

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You can see here we're finding the max horsepower rating of our spindle.

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This is important along with the torque values because this

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will help us determine whether or not we are able

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to use a specific type of tool or remove a lot of material at once as you go down.

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The taper is going to be listed as C T 40 bt 40 or hsk a

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Now,

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once again this is a 40 taper and it doesn't necessarily

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mean you have to use a very specific type of holder,

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but you do need to ensure that your holders are the correct fit for your machine.

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There are plenty of other specifications that you

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can find as you look through these charts.

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Things such as the max tool diameter,

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the max tool weight the amount of time it takes to change the tool.

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You can see here that the tool to tool averages 4.2 seconds.

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These are things that come into play as

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you begin to program your parts specifically.

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If you need to determine whether or not a tool changes more efficient,

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then using a specific tool for multiple operations, for example,

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if you're using a shell mill to face apart and then you

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want to go to a smaller end mill for some additional roughing.

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In some cases it might be quicker to just simply use

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that smaller end mill to face the part as well.

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We have cooling capacity,

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air requirements and overall dimensions and these are all going to be

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standard types of measurements that you'll

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find for specifications of any machine.

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The last thing that I want to do is take a look at the gallery and specifically,

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I want to take a look at the table of the machine.

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Now, in most cases when you're dealing with smaller machines,

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you want to make sure that you identify the fixtures or

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work holding that you want to use on that machine.

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In this case, the Haas VF1 is a relatively small table.

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Now this means that we can't put a lot of vices or work holdings on this table.

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We need to plan accordingly for the size of parts we intend to machine.

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But most machines will have a similar style table in which we can

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use our t slotted nuts and clamps to hold down our work holding

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in this case,

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everything looks pretty good for this machine and this would be more

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than enough to machine the part that we're using in our course.

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And as mentioned,

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you always want to make sure that you understand what machine you are going

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to be programming for because things like the taper or the tool availability,

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the tool changers,

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the rpm limit and the axes that it can machine in are

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going to be important considerations into how you plan and program your parts

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at this point.

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Continue to look through the host website or

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any machine website that you're currently looking at.

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And just identify a couple of the key specifications for various machines.

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Things like the rpm limit and the horsepower

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of the spindle are going to be important.

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But also take a look at the overall travel of the table in X. Y. And the spindle in Z.

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Make sure that you identify those and understand that those are going to

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be limitations that you might run into depending on the part you're programming.

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Once you're done, go ahead and move on to the next step