I am the owner of Hercus Model O serial number OLM670. A couple of years ago, I posted problems I was having with a noisy spindle on my mill. That was fixed but then I experienced a lack of torque which caused me to not use the machine. I was doing other things which meant I didn't get back to work out why the lack of torque. I now know what the problem is. I fitted a Teco FM50 VFD as I only have single phase supply in the shed and the motor was a 3 phase. The motor which came with the mill was rated at 415 in delta. An electrician came and pointed out that the VFD was only putting out 240 volts and this accounted for the lack of torque. I have just fitted a new motor and the electrician will come back later in the week to finalise the connection of this new motor (240V in delta, 0.75kw) to the VFD. In anticipation of the machine working properly again, I have been looking at another problem which needs to be fixed. When I tighten the vertical head down, the machine binds up. What is happening is that there is no clearance between the gear on the end of the spindle and the vertical head housing. The lack of clearance only shows up in the last few thous of tightening the vertical head. The photo below shows that the interference between the spindle gear and the housing has caused damage though rubbing on the vertical head housing. I don't know whether the clearance problem came about when I re-installed the spindle after its repair. Regardless, what I am thinking is that the vertical head needs to be relieved slightly to provide the necessary clearance with the spindle gear. I was thinking that the light use of a die grinder on the vertical head housing would be suitable for increasing the clearance. Any thoughts? Greg :)
Hercus Mill 1.jpgHercus Mill 2.jpgHercus Mill 3.jpg
Hercus Mill 1.jpgHercus Mill 2.jpgHercus Mill 3.jpg
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