Hello All,
I have recently converted my MicroMark 7x12 to CNC, I have been happy with the results so far, but I want to add threading and have hit a hang up on the best way to do that.
I am debating between using a slotted wheel directly off the spindle with 50-60 slots in it, or placing pulleys to speed up the speed of the encoder disk relative to the spindle in the range of 3-27 times. (Happen to have some small pulleys and needle bearing that give that range, 3, 9, or 27 times) And one index pulse per revolution.
So the big question how many pulses off a spindle encoder do you really need to make accurate two cut direction threads? I saw one encoder that had almost 2,000 PPR, so I figured more is better, but does it even matter? Will 1350 PPR make any difference than 50 PPR? If so is there a threshold and where is it?
I saw someone say that they were cutting threads with just an index pulse? Is the whole multi-pulse encoder necessary?
Thank you for your time,
TJ