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A couple of quick thoughts from fellow newbie.

My CNC is a big old Acroloc fairly cheap on ebay. I am pushing the RPM up a bit and my brother in law and I recently built a system to inject a mix...

I cut aluminum and only have 3500 rpm at the spindle so for me almost everything is at max rpm. The factors I can play with are feed per tooth, axial depth, and step over amount.

I don't know...

What is the general thinking for using a shell mill in aluminum?

http://www.jlindustrial.com/ProductImages/medium/SMR-50005.jpg
http://www.jlindustrial.com/NSM-09991H/SEARCH:KEYWORD/product.html...

I am still a newbie with no formal training but after a year of throwing chips in 6061 I will take a shot at your question.

RPM is easy. Run at maximum speed. In aluminum you mostly use max RPM....

Milling half from one side then half from the other works but you will probably see a line. I rough half from each side then my finish pass is all from the second side using a tool with 3" of flutes...

I make skate frames.
http://www.gatorbackskate.com/G16BFrame.jpg

They are cut from solid 6061 (1.5"x3"x17"). The final result is 245g with walls that are 3mm thick. The design is special...

Justin,

Once again BIG thanks!

Last week my Z plunge was 2ipm. This week I used the same tool to plunge at 20ipm while (using 600sfm and .003 fpt). It really feels good to see the machine...

I am still a newbe but this was explained to me by someone I trust.

If the stock is slightly oversize you could do it from one size while clamping the bottom (oversized stock).

To flip it over...

Thanks!

it works great.


double d = Math.abs(Math.sqrt((x * x) + (y * y)));
if (d == 0 || z >= 0) return 0;
double r = Math.atan(z / d) * 180 / Math.PI;

Guys,

I am working on a utility for 3 axis milling. The idea is that the util will analyze a .NC file to compute statistics. My goal is to scan the file then list sfm (surface feet per minute),...

Thanks!

How do you calculate feed rate for plunging or ramping into stock?

I have had good success with slot and profile milling in XY at feed rates between .003 and .007 IPM. Where I have had some tool...

I am still fairly new with only about six months actual experience and for me that means hobby time in my garage (my real job has nothing to do with cnc).

My advice is that if you are getting...

For aluminum on you machine you will want to run every tool at 1500 rpm. You should adjust feed rate based on the tool size. Make sure you keep the chip load in range or you will clog and/or snap...

Thanks again.

The shear hog sounds interesting and I checked out their website but I still have some questions.

For removing the bulk of stock around my part I need to cut along the periphery...

Thanks for the advice! I am not sure why I was so shy about the SFPM.

I took your advice and used 600sfpm, .005 chip load with the result of (2291 rpm at 34.38 ipm for my 1" 3 flute roughing end...

I am using a roughing EM on 6061 T6 stock. The stock is 1.5" thick and I remove a lot of material.

I just bought a 1" 3 flute roughing EM (value brand) from JL. I am planning a surface speed of...

This is a recycled tip from something I saw in another thread. If you have bits that are caked with aluminum you can clean the aluminum off by soaking in Drano. Just be very careful since Drano is...

IPR is the amount of feed for each rev of the spindle.

RPM = SFPM/((TOOLSIZE/12)*PI)
IPM = DRILL_RPM * IPR

An IPR of 0.002 for the drill would result in a feed of 9.93 at 4963rpm.

I am trying to understand some of the basic formulas needed to calculate my own tool paths. Does anyone around here have advice on a book, website, or simply would like to help answer some math...

I am learning about CNC and would like to find someone in Raleigh, NC to help me out on a consulting basis. I have my own shop with a 3x CNC.

I am willing to pay for the consulting.

Email me:...

Forgive my stupidity but what does the term "indexing" mean?

Generally I use indexing for drill feeds.

If I understand your formula for drilling a 5/16" in Aluminum at 250 SFPM the calculation...

Thanks everyone!!!!!!

I REAMED my very first hole and it was great. No slop, perfect fit, and a big smile on my face. It's like I am 19 all over again [;)]

Thanks so much for all the advise...

For aluminum the range is so large 100 SFM to 600 SFM is a fairly large range. What do you think about for picking a value in the range?

Making a hole sure is complex but I feel like I am learning a lot in this thread. Big thanks to everyone. For me the CNC is hobby stuff so production speed is not very important. I want to reach...

Okay, I think I am starting to understand but still I am not sure about my math.

I am sure that there are some great calculators for this stuff on the web (although I am actually still looking so...

Hello,

I am still a newbie and trying to understand some of the basics.

Main question:
How do I determine speed/feed for reamers? (i am looking for the math formulas)

Environment:

...

I am new to this but would the following work?

The following are some newbie thoughts but it might work and someone else can fill in the details.

Step1: Drill and tap a hole in a plate of scrap...

Wow, thanks for the info!

Thanks!

I will put carbide on my shopping list.