can someone please help with hole dimensions

[Clive S]

thanks guys, 30mm probably is ott what would you recommend for all round? i think i will stay with 30mm on the front z axis plate though but for everything else would 25 do? i know 20 is the minimum.

and with the holes so i just say 8.4mm through on plate 1 and 6.8mm tapped 15mm depth on plate 2?

Ash

How big is this machine I would have thought 20mm would have been enough for gantry ends and Z axis.
You said you wanted 8.1mm so now you are saying 8.4 !!!.
You have not mentioned plate number 2 If you want them to tap the holes just say tapped for M8 x 1.25 if that is what you want. You can't just say 6.8mm tapped

I would suggest you re do the posted drawing with the measurements as shown etc