Re: [CAD_CAM_EDM_DRO] Newbie End Mill Calculator (Some questions)

(See previous disclaimer for late reply)

The chip size is probably available in various handbooks. The number I
placed in the cell was kind of the average of the range provided by the
manual with my Taig CNC (for example, 0.006" was used since the range was
0.004-0.010"). Certainly not the best method, but it made my cuts look much
better (and MUCH faster).

SFM is indeed Surface Feet / Minute - again taken from manual, although I'm
sure you can find it in different sources as well as inches per tooth.

The calculated feed rate is in Inches Per Minute.

Note that all cells are free to be changed, so if you like to take on larger
or smaller chip loads, you can make the change to one cell to customize to
your liking.

If you still have questions, let me know if I can help.

Regards,

James

----- Original Message -----
From: <glee@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, January 15, 2002 4:00 PM
Subject: Re: [CAD_CAM_EDM_DRO] Newbie End Mill Calculator (Some questions)


>
> James,
>
> Thanks for posting your spreadsheet. What I like about your spreadsheet
is
> that I can experiment with cutter size, etc to see how that would affect
my
> machining.
>
> For example, I recently "hurt" a piece of aluminum I way trying to
machine.
> I was using a 1/8" end mill but I am sure that I had the RPM set to about
> 3000. According to your spreadsheet, this was way to slow and probably a
> significant contributor to why my cuts looked terrible.
>
>
>
> As a beginner, I had thought of making up a similar sheet however I'm
still
> trying to grasp some of the concepts.
>
> Your spreadsheet brings to mind some key questions:
>
> I'll start by asking some basic questions based on your spreadsheet:
>
> 1. You have a place in which to enter the desired chip thickness
>
> I don't know enough to know where I should get this number from. My
> parts will be Aluminum or Plastic.
>
> Should I just accept your default of 0.006 - is that a good working
> chip size?
>
>
> 2. You have an entry "SFM" Which I assume means "Surface Feet/Minute??"
Is
> this correct? Would I learn this number from Machinery's Book?
>
> 3. Likewise, you have an entry for "Tool Feed Inches/Tooth" - Again, I
> must ask, what is the best place to look to obtain this information?
>
>
> 4. Is the feedrate that you compute feet per minute or Inches per minute?
> (As you can see, I'm revealing just how new this stuff is to me)
>
> For example, you show aluminum with a 1/8" cutter should have an RPM
> of 7633 and a feed rate of 106.
>
> I am using Dolphin for my CAD/CAM and I can enter a feed rate when I
> define my tool. It asks me to enter a feed rate in INCHES/MINUTE.
>
>
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