Boxford TCL , Spindle motor problem

[m_c]

What happens to the voltage under load?

[John11668]

Increases a little. but not a massive amount. Current shows a fair jump (Hard to see the actual amount on a digital MM )but then settles back to a steady current 0.1 -0,2 A increase on before .
It seems to me as if it is not responding quickly enough to the sudden application of cutting load so if the load is not massive it gets to coping after a second or so.
At screwcutting speeds the torque is already low so just droops away.
To me it would seem to tie in with the slow ramp up response (ie it is struggling at low speeds) I am guessing it needs quite a boost to get up to speed from zero quickly . Just doesn't seem to be getting that.
And I guess it needs a quick boost to hold speed on threading . Just isnt getting it .
.