MPG as hobbing encoder
Posted by
argowools2000
on 2007-04-15 07:02:49 UTC
Hi Art,
Welcome back.
I have been trying to make a hobbing setup on an x3 mill.
On the spindle I have mounted a 250 line encoder, and have a 40:1
dividing head on the table as A axis. This is driven by a Nema 23
stepper with a Gecko drive. By my reckoning, I will have 1000 pulses/
rev on the spindle, and the setting for the div. head will be
222.2222 per degree of rotation. So. for a 1:1 ratio, 1 turn of
spindle should
require 80,000 pulses at the stepper.What setting should the velocity
be at and should I be in step/ velocity or velocity only?
By the way, the axis turns as sweet as a nut, it's just I cant find a
way to set the "gearing" accurately.
This is something that would be of enormous value to others in this
group. Doing some experiments on my full size hob with a fly cutter,
I can do timing pulleys with ease. Its just that getting older, I
prefer to work from my home shop on smaller stuff. (clocks)
So, I guess my real question is, do you need the velocity setting on
the calibration page, as every change here affects the pulses per rev.
What we need to cut say a 12tooth gear is 12 turns of spindle per 1
rev of "A" repeating endlessly. Doing a G1 at the same time would be
nice for the table but I'll settle for hand feed.
Many thanks, and stay well.
Dave Pope
Perth.
Welcome back.
I have been trying to make a hobbing setup on an x3 mill.
On the spindle I have mounted a 250 line encoder, and have a 40:1
dividing head on the table as A axis. This is driven by a Nema 23
stepper with a Gecko drive. By my reckoning, I will have 1000 pulses/
rev on the spindle, and the setting for the div. head will be
222.2222 per degree of rotation. So. for a 1:1 ratio, 1 turn of
spindle should
require 80,000 pulses at the stepper.What setting should the velocity
be at and should I be in step/ velocity or velocity only?
By the way, the axis turns as sweet as a nut, it's just I cant find a
way to set the "gearing" accurately.
This is something that would be of enormous value to others in this
group. Doing some experiments on my full size hob with a fly cutter,
I can do timing pulleys with ease. Its just that getting older, I
prefer to work from my home shop on smaller stuff. (clocks)
So, I guess my real question is, do you need the velocity setting on
the calibration page, as every change here affects the pulses per rev.
What we need to cut say a 12tooth gear is 12 turns of spindle per 1
rev of "A" repeating endlessly. Doing a G1 at the same time would be
nice for the table but I'll settle for hand feed.
Many thanks, and stay well.
Dave Pope
Perth.