Retrofitting a 1986 Maho MH400E

When I install the vfd then I will deactivate the input gear. For start I will operate the full gear box.
The Mitsubishi vfd is sensored, I need the encoder at the motor to operate in vector control mode. i need to solve the grounding of the motor shaft, and installation of the encoder to make the transition to vfd. The backlash in the gears is one problem and the slip of the belt is another, but any diy encoder in the head will have lower resolution then the backlash. the most of the backlash you feel when rotate the spindle by hand, is not in the gears, but the break on the motor has some play. I hope the remaining backlash in the gears is acceptable for rigid taping, if not than I will examine other options.
Any help is welcome, have any links?
John

This is te thread where Andy Pugh posted his code for a HAL component to control a four speed gearbox.
forum.linuxcnc.org/38-general-linuxcnc-q...control?limitstart=0

He also added this earlier in this thread:
forum.linuxcnc.org/12-milling/33035-retr...e?limitstart=0#96020

db1981 wrote earlier in this thread that he has written a HAL component to control a MAHO gearbox
forum.linuxcnc.org/12-milling/33035-retr...h400e?start=10#96074
He will share it, but just wanted to clean up the code a little.

Will you remove the spindle brake and add the encoder there? With a breaking resister on the VFD the mechanical brake is probabaly unnecessary.
Mark

The best is to keep the break for safety reasons, but the perfect place for the encoder is in breaks position. I have already removed the break to measure the space between motor and cooling fan.
John

Please post photos of the removed brake and the motor shaft.

ok

I have feed the spindle-vel-cmd-rps-abs to ladder and with comparison items i have managed to start the sequence for select the appropriate gear, at the same time I am feeding from ladder the spindle-at-speed so the motion on all the axes pauses until the gear change is complete. I need to put some timers to delay the gear change until the brake of the motor stops the spindle completely, and make some careful examination of the ladder file for bugs and I will post the files.
This is the encoder I will put on the spindle motor at the end of the shaft so I can keep the brake for safety reasons.
I was planning to post some pictures of the brake but the usb stick has fall on the elevators hole…lol
John