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Feed and speed questions

9/30/22       
Ben Robinson Member

I have been messing with my feed speed and RPM. The machine came to us set up and I was unsure where the numbers came from. I found a feed and speed calculator online and with the technical data from my bit book, it is coming back with really lower numbers for my bits.
I am currently set at 16500 and 400IPM on a 3/8, 2 flute, .020 chip load/per flute bit. cutting 3/4 Laminate Particle board 2-sided.
The machine can cut a max of 1000IPM.
It produces alright cuts.. when cutting double LP stuff it tends to try to chip every now and then. The bits also look like they get pretty hot, as well as the sawdust coming out is hot usually.
When I enter my information in the calculator, I get like 7000RPM and 265IPM ? for that bit. The only time I can get it to go up to 16000 RPM is maybe a 1/8 bit...?
Setting the machine to this produces a nice, colder cut, but is much slower of course.
How are you all getting these Spindle RPM speeds? Why is everyone running them so high when the formulas say for the bit diameter and flute sizes they need to be much lower... 1/2 bits on the calculator at 2 flutes is saying 5000 RPM?
Just sacrificing tool life for productivity?

Sorry for the lengthy post.

9/30/22       #3: Feed and speed questions ...
Dylan

Website: http://cnc-tool.com

You are making a mistake with the calculation.
its feed / # of flutes x RPM, so 400/(16500) x 2 is a chip load of 0.011" burning the tools. You should increase the feed to 650-700 in/min. Please review the link below and feel free to call and discuss. Calc. is also attached.
have a great weekend.
regards
dylan

feed and speed chip load information

10/2/22       #4: Feed and speed questions ...
Mark B Member

Download FS Wizard Ap.. Its more of a machining (metal) app but it works great for wood and non-ferrous too. Im with Dylan.. 400IPM your just grinding the tool to death and it will kill you with laminate as the cutting edge will breakdown right at the laminate layer and you will have issues with it fracturing the laminate inbound of the cut.

If you have the HP I running a 3/8" 2 flute tool twice as fast would get you closer. Your chips will always be hot, they will just be bigger.

10/3/22       #5: Feed and speed questions ...
Dropout Member

Just make a quick excel file.

RPM times # of flutes time chip load per tooth. We run 19mm deep in 21mm baltic birch all day long at 16500 RPM, 750 IPM. Have run 1/2 ply at 1,100 IPM and I know people who are running faster.

If you are not doing so, try FS Tools coated bits on the laminate.

10/3/22       #6: Feed and speed questions ...
Ben Robinson Member

Can you send me a link and copy of your tool numbers. So I can take a look at what you are using?
We use LMT-Onsrud right now, their Marathon series. They are coated with something, but I am unsure as to what they are coated with.

10/3/22       #7: Feed and speed questions ...
Ben Robinson Member

Also thank you for the feed back.. These numbers are preset from the factory. I have never messed with the feed and speed of the machine. I was getting the information for the chip load from the tool manufactures specs.

10/3/22       #8: Feed and speed questions ...
Dropout Member

Preset?
What machine and what software?

10/3/22       #9: Feed and speed questions ...
Ben Robinson Member

Boss Router
RouterCAD in the office
and Mach 4 out in the shop

10/3/22       #10: Feed and speed questions ...
Dropout Member

What size spindle? That may be limiting the feed rate.

10/9/22       #11: Feed and speed questions ...
Acctek  Member

Website: https://www.acctekgroup.com/index.html

Feed rate, also known as feed rate, refers to the distance that the tool (or workpiece) moves along the feed direction for each revolution of the workpiece (or tool).


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