Retrofitting a 1986 Maho MH400E

Hi John, how is your MAHO coming along?

Yes we made the twitching constant, and independant of what is happening during the gear change. The flow chart of what we did is here (it is in open office format, so It will open in most linux distros:
github.com/jin-eld/mh400e-linuxcnc/blob/...e%20flow%20chart.odg

I have a friend in Germany with an MH500E, and he made two videos of his machine doing gear changes, which really helped to get a feel for that behavior. It looked to me that MAHO and Phillips also implemented a constant about 1 sec per direction.



There is a fair bit of inertia in the system, so the spindle is still turning in one direction when the relay for the other direction energises. Since this is only pushing 90VAC though the 400V motor, I figured it should be no issue. You could probably increase that 200ms off out to 500ms, but it seems to work fine like this.
Mark

I am having troubles with the servo adaptors. They screw at the end of the tachometer and they have considerable rounout.

henriksplace.se/cnc/cnc_photos/abene_encoders/scancon_1.jpg
I have make something similar to this

Will the gearbox.comp allow shifting with infinitely variable spindle speed. I have a Deckell FP5NC with variable speed spindle motor, VFD controlled. It has what looks to be the same 18 speed gearbox.

Yes, but you have to ad to the hall file something to properly scale the output for the vfd with the selected speed

You also have to change the file .comp and hall to match the structure of your gearbox, cams, and relays.
John