Does anyone have a good plan for determining feed speed? I have searched the internet and am more confused than when I started. They talk about chop size, router speed, heat loss etc. One place says keep increasing speed until you break the bit. I can' aford that.
I am using a 0.125 end mill for roughing and a 0.031 ball for finish and am running both at 40 inchs per minute. I use mostly cherry and walnut. What are others doing?
Feed speed
Moderators: al wolford, sbk, Bob, Kayvon
Re: Feed speed
Van,
You did not mention your depth of cut. This will factor in too.
I cut hardwoods at 100 ipm with a .125 bit...and 50-75 ipm with a .25 bit on the rough side.
I do this with .1 doc on .25 mill...and .050 doc on the .125 mill.
The .031 ball is a bit trickier...you can run it 100+ ipm....ONLY IF...it does not start in a hole.
If it starts on the side of a 3d image where the side load is small...as in 10% of diameter..
pour the coal to to it....If it has a tricky start...program the high feed rate, but use the
feed rate override to start slow until it cuts a small starting area then bump the feed rate back to 100.
Teir
You did not mention your depth of cut. This will factor in too.
I cut hardwoods at 100 ipm with a .125 bit...and 50-75 ipm with a .25 bit on the rough side.
I do this with .1 doc on .25 mill...and .050 doc on the .125 mill.
The .031 ball is a bit trickier...you can run it 100+ ipm....ONLY IF...it does not start in a hole.
If it starts on the side of a 3d image where the side load is small...as in 10% of diameter..
pour the coal to to it....If it has a tricky start...program the high feed rate, but use the
feed rate override to start slow until it cuts a small starting area then bump the feed rate back to 100.
Teir
Re: Feed speed
the FRO is used to slow down the machine while it is running.
That is the main purpose but you can also slow the jog down by lowering the FRO.
That is the main purpose but you can also slow the jog down by lowering the FRO.