Thread: Feeds & speeds

Here is a chart that I got from NMIT where i do fitting and turning.
Use this as a general setup and tune the cutter to the material being cut.

https://www.woodworkforums.com/f65/mi...9/#post1228064

/M

Originally Posted by seafurymike

Here is a chart that I got from NMIT where i do fitting and turning.
Use this as a general setup and tune the cutter to the material being cut.

https://www.woodworkforums.com/f65/mi...9/#post1228064

/M

Maybe I'm misreading, but that chart maxes at 4000 RPM, and only references metals?

The idea is to say pick aluminium and use this as a reference for wood.
Try it on the material you have for the cutter size you want to use.

Its a place to start, then you would tailor the speed up and down and maybe by the time you finish you can make your own chart up which is specific for wood.

No one i know of has anything specific for wood, so this was a means to give you a place to start

Originally Posted by seafurymike

The idea is to say pick aluminium and use this as a reference for wood.
Try it on the material you have for the cutter size you want to use.

Its a place to start, then you would tailor the speed up and down and maybe by the time you finish you can make your own chart up which is specific for wood.

No one i know of has anything specific for wood, so this was a means to give you a place to start

OK thanks, I'll see if I can make heads or tails out of it.

Originally Posted by BoomerangInfo

OK thanks, I'll see if I can make heads or tails out of it.

yer its the real fine bits that need the high speed

bit like pen polishing to roughing out 2 foot round bowls

a double cut steel with tungsten tip router bit is designed for 20,000+ , a 10mm mill bit isnt, if the cut is burnished the rev's are too high/ feed rate too slow , ripping up grain the rev's are too slow / feed rate too high !!!!or blunt !!! , bit / speed / material , there is too many variables like knots

brake a bit , well thats just operator error broke a 2mm ball nose tonight no rev's air cut , into the base aluminium , " PING" machines fault i say it is , the machine dosnt have limit switches yet yer yer , 500 mm depth is my fault ??? 50 mm ??? my first berry it into the table and move x back and forth to bore , at least the bit wasn't spinning just a scratch

Details here, including chip loads for different materials:

Calculating Feeds and Speeds - CNC Router Shop

http://www.cncroutershop.com/media/u...utterguide.pdf

Originally Posted by seafurymike

No one i know of has anything specific for wood, so this was a means to give you a place to start

You'll probably need to convert the chiploads into mm's, but if you find an Onsrud tool that's similar to what you have, they'll have a feed and speed for it.
Chiploads | Feeds and Speeds | Metal | Plastic | Composite | | LMT Onsrud