Deckel FP5 Gearbox Comp

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05 May 2022 16:58 - 06 May 2022 22:16 #242051 by gernoff
chili023 has graciously agreed to helping me develop a working gearbox comp for the FP5 machine.

The  system is based on a 6 speed gearbox with 2 shifter motors that drive the gearsets
One shifts:
High Neutral Low speed
and the other:
Low Medium High

The original spindle drive was variable speed DC and will be replaced with a AC servo VFD.

Attached are the wiring diagrams for the FP5 as well as chili023 gearbox Comp.
 

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Last edit: 06 May 2022 22:16 by gernoff.

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05 May 2022 17:15 #242055 by andypugh
Replied by andypugh on topic Deckel FP5 Gearbox Comp
I am not sure why you are changing the spindle motor? If it works, it works...

You don't need a servo for the spindle drive, AC induction motor is fine. You do want an encoder, but that belongs on the spindle, not the motor.

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05 May 2022 19:20 - 05 May 2022 19:22 #242060 by gernoff
Replied by gernoff on topic Deckel FP5 Gearbox Comp
The existing 7kw DC spindle motor died. You are correct though, I do not need a servo drive for the motor and hope to find a good solution for adding an encoder somewhere on the final output shaft of the geartrain. The FP5 was variable speed so I am hoping we can develop logic to be able to select a gear with speed range near  the 'center' of the programmed speed  and then be able to adjust spindle speed as necessary while staying in that gear.
Last edit: 05 May 2022 19:22 by gernoff.

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06 May 2022 09:42 #242109 by andypugh
Replied by andypugh on topic Deckel FP5 Gearbox Comp
If properly configured the system will wait for spindle.N.at-speed before starting any feed moves. So a HAL component that handles gear changes just needs to leave this at false while it picks a gear and engages the gear.
In practice you would probably and2 the spindle-at-speed from the VFD and the signal from the gearchange comp. (possibly inside the comp)

component inputs:
spindle speed command
vfd spindle-at-speed
spindle on
(possibly) motion-mode to allow a gear-change during the next G0

component outputs:
gear selector motor signals
spindle motor motor speed command
arbitrated spindle-at-speed
gear indicator for GUI?

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