CBlair
Diamond
- Joined
- Sep 23, 2002
- Location
- Lawrenceville GA USA
I would like to ask how do you come up with your feed for a tap when using a VMC. I currently use a chart supplied by one of the manufacturers to find a rpm and then I multiply that by the pitch of the tap. However, I usually wind up with some funky number and I try to keep my feedrate at no more than two decimal places.
I will wind up just playing with the rpm to get as close to an even number for the feedrate as I can, like 40ipm or 30.02 or something else that has less than two decimal places in it. Do any of you have any formula or better way to get these numbers other than trial and error? If I was a little smarter or actually remembered any of the math I took in school 25 years ago I might be able to figure it out myself...
My machine has a fanuc 21i by the way, do any of the other controls out there allow more decimal places for the feedrate and how accurate can the machine feed anyway?
Charles
I will wind up just playing with the rpm to get as close to an even number for the feedrate as I can, like 40ipm or 30.02 or something else that has less than two decimal places in it. Do any of you have any formula or better way to get these numbers other than trial and error? If I was a little smarter or actually remembered any of the math I took in school 25 years ago I might be able to figure it out myself...
My machine has a fanuc 21i by the way, do any of the other controls out there allow more decimal places for the feedrate and how accurate can the machine feed anyway?
Charles