When is it necessary to bolt a table down?

[HereinCS]

I'm building my table out of 8020. Weight of the table is around $170lbs, not including anything else. I figure my rails would add another 50lbs. The gantry and z axis/router around 200lbs. I'm using servo motors with a max of a bout 380ipm. When I got the quote from 8020, they seem to think that the table needs to be bolted down. What do you think?

[ger21]

Depends on how fast you're acceleration is, and what the base of your machine is? Does it have small, slippery feet?

I use leveling feet made from hockey pucks. Very grippy.

[HereinCS]

I have the DMM tech 7.2 nm servo system, 10mm lead screws. I've finalized my frame one my build thread:

http://www.cnczone.com/forums/showthread.php?t=107619

I think the feet are ruber: 8020 part 65-2209 economy anti-vibration mount.

[Phife]

do you mean bolt a table to the floor so the machine doesnt move? or bolt a table/sacrificial bed to the machine?

[HereinCS]

I think the frame builder thought to bolt it to the floor.