Re: Tormach / Haimer accuracy
Originally Posted by
adamvs
I use the cheapo Tormach TTS electronic edge finder ( about $40 ). I found that the rotational position it was in the spindle could make for up to a 0.003 difference in runout on the ball. If oriented just right in the spindle, run-out is almost zip, and if re-oriented at that spot, zero run-out is repeatable.
For an edge finder, you are supposed use it while the spindle is running at lower rpm (<1000). That removes any run-out related errors. If you think about it, run-out affects your end mill just like it does the edge finder, so any slight wobble in your end mill is going to cut slightly deeper then the width of the end mill. Same run-out with the edge finder pushes your centerline of the spindle that much from your workpiece, canceling the effect.
Here is a video from Tormach showing that. The electronic edge finder starts at time 1:56:
https://www.youtube.com/watch?v=f0od-cp_9dg
Tim
Tormach 1100-3, Grizzly G0709 lathe, Clausing 8520 mill, SolidWorks, HSMWorks.