How To Calculate CNC Feeds and Speeds | ToolsToday

What is chip load? How does the chip load determine how fast your CNC feed rate Inches Per Minute (IPM) should be? Using his CaMaster 7 Horsepower Cobra X3 CNC Machine, Jeff answers these questions and more in our latest CNC video.

ToolsToday provided product.

Feed, Speed, Chip Load & Ramp Down CNC Running Parameters

3/8" Dia. Solid Carbide, Spektra™ Coated Compression Spiral Flute CNC Router Bit No. 46172-K
Feed Rate (IPM): 740
Speed (RPM): 18,000
Chip Load (Per Tooth): 0.020"
Ramp Down: 370 IPM

1/4" Dia. Solid Carbide, Spektra™ Coated Compression Spiral Flute CNC Router Bit No. 46170-K
Feed Rate (IPM): 540
Speed (RPM): 18,000
Chip Load (Per Tooth): 0.015"
Ramp Down: 270 IPM

1/8" Dia. Solid Carbide, Spektra™ Coated Up-Cut Spiral Flute Router Bit No. 46100-K
Feed Rate (IPM): 180
Speed (RPM): 18,000
Chip Load (Per Tooth): 0.005"
Ramp Down: 90 IPM

1/16" Dia. Solid Carbide, Spektra™ Coated Down-Cut Spiral Flute Router Bit No. 46237-K
Feed Rate (IPM): 100
Speed (RPM): 18,000
Chip Load (Per Tooth): 0.003"
Ramp Down: 50 IPM

60° V-Groove Solid Carbide Insert Knife Amana Tool CNC Router Bit No. RC-1108
Feed Rate (IPM): 30
Speed (RPM): 18,000
Chip Load (Per Tooth): 0.002"
Ramp Down: 15 IPM

Produced by Jeff from Work Against The Grain

Thank you for watching this How To Calculate Feeds and Speeds for Your CNC Machine Video by ToolsToday

[donaldjeansonne]

I am investigating or learning how to best use router bits. I understand that the common approach uses the formula
Speed (RPM) = Feedrate / (# of cutting Edges x Chipload). I wanted to know how depth of cut or width of cut can affect the chip load. Does the general formula make assumptions on DOC or do you limit it to a value, etc.

[Tokamak_]

Do you have a Metric version of this video? My mind don't understand inches!

[CNCPRINTBLOGSPOT]

NIce Video, pls make a Video why we shouldn't use straight cut router bit end mills for our cnc or can you make a video about comparison with them?

[michaelrusso]

Do you use any ramping distance with the 46170-K? I’m trying to sort out all the info out there between ramping and just plunging.

[kd_design]

Awesome video! And really nice description!👍

[shaynemexon]

Any tutorials on how you finish your signs? Black infill

[robforas]

My CNC has a Makita M3700G router with "not load speed of 35, 000 rpm" on it. the "No load speed" is the same value of spindle speed that I have to use in the formula?

Sorry guys, Im new to this concepts.

[nordiccnc]

How can I take into account the bits pass depth data?

[kldzk]

what about walnut? I am currently using eBay HSS end mills and I have a 6040 CNC. I am trying to run a production do you think I should switch over to quality end mills?

[lylet]

In your V-Carve what font did you use? There are so many fonts to choose from I get a headache trying to find a nice cut. I’m using Vectric- Desktop, Vectric is one of the best software. Your help would be greatly appreciated. I’ve watched this video twice now trying to absorb all the great information. Please keep up the with this type of informational video.
Again great job

[herehere]

Hello, thanks for the video.
How do I know if I have enough power/torque?

[clarkstevens]

Well that was neat to watch but you did not discuss spindle speed

[chaselee]

Nice tutorial! My only question is, who is the girl in the clickbait?

[spyone]

What does the term "ramp down" mean

[gregshields]

good video TOOK A WHILE but can someone tell me if i am correct. I am usuinga Shapeoko 3xxl with a water cooled spindle using a 46286-K bit on oak for 3d finish so at 18000 rpm x2 flutes x .0015 chip load equals my speed to 54 IPM?

[angusstevenson]

So - if I was cutting 12mm plywood - using the 1/4" compression Spektra bit (46170-K) - what feed-rate and what depth would be OK to use? (considering the work-piece is extremely well clamped down and the machine is super solid/ rigid). Would it work to go full depth at 540 IPM? Thankyou.

[MarcoAurelio-rskg]

MUITO BOM, SÃO INOVAÇÕES COMO ESSA QUE VALORIZA .

[fndne]

So, um, why are Amana's chiploads so much lower than chiploads from everyone other company in the industry?

Is Amana's flute geometry inferior? No. They look very similar to the competition.

Is Amana publishing chiploads much lower than their bits' true capability in order to get inexperienced users to dull their bits faster so they buy more bits?

Or is Amana using inferior carbide, and giving us slow feed rates so that if we break bits, they can blame us instead of their product?

Onsrud, Vortex and others all publish very similar chiploads for similar products. Amana's chiploads can be as much as 60% slower. In some cases means feed rates so slow that they can potentially start fires in certain materials.

Why? It makes no sense.

[fndne]

On Tools today's website, the Amana 46172-k has no chipload information. 
On this video, you're running it at 740 ipm with a chipload of 0.020"
On Amana's website the Chipload per tooth is listed at 0.005", yeilding a feed rate of 180ipm at 18000rpm

This is incoherent. This is a disservice to customers. 
This is dangerous - running 180ipm with that bit in MDF could start a fire.

Nobody should be buying Amana tools until they start publishing chiploads in a way that matches industry standards.

[acerjuglans]

Chip load formulas mean literally nothing, when your CNC simply can't move over 200ipm. It's like putting a speedometer on your riding lawnmower so you can keep up with highway traffic.