Emco PC120 Turn

[m_c]

Take test cut with known tool, don't move X after taking cut, measure cut, and enter value into X DRO.

Provided you're not doing anything that affects tool offsets into relation to each other, then you don't have to touch individual tool offsets. All you have to do is establish the actual X axis position.

However, install a decent homing switch on the X axis. On a lathe, it makes life so much easier.

[Chaz]

Take test cut with known tool, don't move X after taking cut, measure cut, and enter value into X DRO.

Provided you're not doing anything that affects tool offsets into relation to each other, then you don't have to touch individual tool offsets. All you have to do is establish the actual X axis position.

However, install a decent homing switch on the X axis. On a lathe, it makes life so much easier.

Thanks. The pain here is to do a test cut .... I think you use the lower DRO here for the 'new' measurement?

The homing switches look to be 'decent'. They are proximity ones. I'm not sure what the repeatability is with them. Ill do some testing over the weekend. How much 'tolerance' should I expect with homing? Better than 0.01mm?

[m_c]

What lower DRO?
From memory, you just enter the measured value into the main X axis DRO.

Homing accuracy depends on how accurate your parts/machine are. On my first lathe, I had an opto slot sensor that I couldn't measure any noticeable change with using a 0.01mm graduation DTI.

[Chaz]

What lower DRO?
From memory, you just enter the measured value into the main X axis DRO.

Homing accuracy depends on how accurate your parts/machine are. On my first lathe, I had an opto slot sensor that I couldn't measure any noticeable change with using a 0.01mm graduation DTI.

Sorry, on one of the videos the guy uses the tooloffset screen. I think he edits the lower DRO to get it to be the same as the measured diameter. In my case I was manually subtracting (or adding) to work out the required difference to make the reading correct. In the tooloffset screen I dont think you can edit the top DRO. Perhaps I'm just doing it in the wrong place.

Ill use a dial gauge on the weekend and test repeatability.

[m_c]

Don't bother with the tool offset screen. Just take a test cut using one of the main screens, then measure and enter the value into the main DRO.

[Chaz]

Don't bother with the tool offset screen. Just take a test cut using one of the main screens, then measure and enter the value into the main DRO.

Thanks, that removes one of the pain in the ass with sorting this problems as I have to go from screen to screen continuously.

So if my switch is not repeatable, ill set the offsets from the master tool (and use the cut / measure / input method). If it is, ill set it up from the switch.

[Chaz]

Ive ended up setting offsets the painful way from the homing switch, seems to work better for me. Will test again today and see if its still working.