CNC Build - TEP milling machine conversion

[craynerd]

The spindle is taken from Blackburn Marks advice on a brushless DC motor. Using a ER16 chuck with a 8mm shaft and direct replacement adding a bearing house:

camera phone shot.


Up and running, intial tests:

[craynerd]

During the last week I`ve stripped the machine to do some mods and in the last few days got it back together. However, I just can`t get my head around the fact that the movement is well out of sync! Just a simple example, say I draw two ovals concentric to one another, they will end up overlapping and even with little flats on them instead of nice curves!

The wierd thing is, I get the same results on both Mach3 and EMC2... so either I`ve got a setting wrong in the software on both or something is wrong with the TB6560 driver?

I`m sure it was working OK just last week and so after nearly a full day trying to correct it today, any thoughts or suggestions would be helpful...I`m totally out of ideas!

Chris