Zeroing a hold down fixture to the table?

[phil_locker]

I'm bidding on a job that will require milling of a slot into a small part with sub-mm accuracy (using a 0.030" diamond bit). Thought is to mill a hold down fixture from UMHW to hold 10 or so parts (with vacuum hold down for each) and do them in batch. But how to accurately zero / align the hold down fixture to the table? Batches will likely be run on a monthly basis.

(PRT with controller upgrade)

[gpari]

Put aluminum blocks on the 0,0 corner and run a touch-off routine that will zero the table to where ever you put the pallet. Some people here use this method instead of proximity sensors.

Gabe

[kfitz]

What not use two locating pins on the fixture and two sleeves in the table? https://reidecom.reidtool.com/xephr/edit/CATEGORY?query=*START_WITH_ID=4446
The only problem I can see is when you surface your table. Maybe you could get plastic sleeves instead of steel?