Problem- changing chucking direction

[crazycnc]

I have a Takisawa TC-20 lathe with a Fanuc 21-TB control. I would like to change the chucking direction so I can clamp on the ID of my part. I can't find anything in the machine manual to indicate that this is possible, but the manual isn't the greatest either. Does anybody know if this is possible at all?

[Harmeet]

Chuck in Takisawa machine is made for both operations. there are two ways to change that generaly in all machines.
1. M-code. check the M-code list.
2. By key switch or selector switch on the machine or in the electrical panel. check for that.
and still if u can't find u have to check the machine ladder. there u can find it.

[txcncman]

Check the first couple of pages of parameters. Usually on Fanuc, there is a setting for clamping direction. I think it is 0 for OD and 1 for ID. You have to be in MDI mode and change the PWE setting before changing this parameter and then change the PWE setting back before proceeding.

[fordav11]

changing parameters to set the chuck clamp direction is not normal on Fanuc. I've never seen any Fanuc where I had to change a parameter to set clamp direction under normal operation. It has to be operator changeable. Operator means 'button-pusher'.

press the hard CUSTOM button. there should be a chuck OD/ID clamp setting in there. move it using left/right arrows.

if not some machines have a physical switch somewhere on the outside of the machine usually near the chuck pressure gauge that can be set to clamp OD/ID. When this switch is moved the chuck will change direction and physically move from clamp to unclamp so be careful if you have a part clamped in the chuck or it will fall out.

[txcncman]

(Redacted due to conflict.)

I mistakenly assumed the original poster carefully looked the control panel over for a switch or button to change clamping direction.

[Golfer79]

I disagree TX. I currently run a Hardinge T-42 and it is a simple G code in MDI not parameters. Note: Chuck needs to usually be closed to change chucking direction in MDI mode. So look at the machines list of codes close the chuck and change to internal chucking mode.

[underthetire]

Hardinge is not a great example. They do things a lot different than most other builders, not necessarily bad, just a lot different, all the takasawas I worked on had panel buttons for Id/od or through custom on some models. Hardinge uses an mcode that changes a machine side parameter, you can do it either way on our hardinge.

[sepganesh]

Our Takisawa TC 20 works with M89 for id clamp and M88 for od clamping.for id clamping input m89 and cycle start and you are good to go.

[crazycnc]

Thanks sepganesh. M88 and M89 it is. I had actually tried this before, but I got an error message about not being able to complete the command or something like that, so I assumed it wasn't working, but it actually does toggle the chucking direction, even if it errors out.