Brother TC-211

I'm pretty sure it is a linear problem. I only Moved in the x pos direction during the check. I also found an error in the z axis of. Apex. .015 all in the z minus direction. I haven't done any back lash checks yet. I was wondering if it could be a metric ball screw or I have the encoder counts wrong

How about error over distance, is it constant? how much error over 1", 2" 5", etc. i.e. maybe the encoders are 2048ppr rather than 2000ppr. Or, more complicated here, the encoder connections are not physically wired how the cards are reading them or visa-versa.

mblaszkiewicz wrote: I was wondering if it could be a metric ball screw

I would be amazed if it wasn't a metric ballscrew.

Doing some basic math on the results I got in my checking it appears that the pitch is based on metric dimensions. It is written as a 5 tpi ball screw, but if I use 25mm instead of 1 inch (.4 mm) difference. I found my .015 error. .4mm equals. 0157 my present error. How would I adjust my encoder count to fix this? ???

if this is a metric ballscrew it will be 25mm x5mm pitch , what encoder is fitted and it will have x counts per turn either in the part number or in the manual
are you setting the machine in Imperial or Metric , the easyiest way is if the machine is metric then set the machine units in metric also

can you give details of encoder fitted ?

the confusion will arise if you try to set up the machine in imperial inch when it is a metric machine , their will always be an error due to rounding

It is a 1024 count ppr for the encoder. As with a few other things the manual is off a little. It says it is a 5 tpi.
With the metric ball screw and imperial measuring how would I adjust the encoder count so it is correct. I'm really not would about making everything metric or re writing the whole Hal file.