Problems with building an xyz

[xios.rfnf]

Hello,

Together with 3 other students I have to build a xyz-table to do some precise mesurements (1/100 mm). We wore wondering if someboddy could give us some tips to keep in mind when we are drawing and developing the table.
We're probably going to use aluminum for the construction of the table (one material to keep galvanic corosion to the minimum and to have the same temperature effects). We 'll use one arm (movement in z direction) and 2 axes to move in the XY- direction.

thanks for you're help

[Regnar]

what size table do you need to build?

[xios.rfnf]

Originally Posted by Regnar what size table do you need to build?

we should be able to scan in cube form with each side 1,6meters

[svenakela]

Wow, that's pretty big.
1/100ths on that big machine, be sure you have to control the temperature and humidity in the room if you want to guarantee those low levels of measurements.
I wouldn't go for aluminium on that size and the wanted precision, it's simply not temperature stable enough as I see it. There are companies that sells high precision pregrinded steel parts and it's not much more expensive than alu. I would create box or L-shapes by mounting two (or more) steel plates together with screws, it will be both strong and much more stable than alu.
For example the Swedish super steel company Uddeholm also has an office in Belgium.

http://www.uddeholm.com
http://www.uddeholm.be


Good luck, and don't forget to bring us pictures!
Sven

[xios.rfnf]

Originally Posted by svenakela Wow, that's pretty big. 1/100ths on that big machine, be sure you have to control the temperature and humidity in the room if you want to guarantee those low levels of measurements. I wouldn't go for aluminium on that size and the wanted precision, it's simply not temperature stable enough as I see it. There are companies that sells high precision pregrinded steel parts and it's not much more expensive than alu. I would create box or L-shapes by mounting two (or more) steel plates together with screws, it will be both strong and much more stable than alu. For example the Swedish super steel company Uddeholm also has an office in Belgium. http://www.uddeholm.com http://www.uddeholm.be Good luck, and don't forget to bring us pictures! Sven

Yeah it's pretty precise for such a big thing but we are only going to attach an measurement probe. These are very light so they shouldn't pose a big problem at all. The whole system is going to be pretty "over" designed so were sure we get the wanted result and keep the amout of vibrations low between steps.
And about the aluminum: i think will get a climatised room so do you still think its beter to go for steel plate?

And offcourse will put some pic's online of the final product.

[svenakela]

Originally Posted by xios.rfnf And about the aluminum: i think will get a climatised room so do you still think its beter to go for steel plate?

I would.