Printing press foundation

[isambarb]

Anyone familiar with a Roland 700 type printing press?
Suppliers of the equipment indicate minimum concrete plinth dimensions and specify some dynamic characteristics.
My question is whether these types of presses require detailed dynamic foundation design or whether they run so 'smooth' that dynamic issues are practically negligible.

 

[isambarb]

I understand that the Roland 700 is low frequency,less than 250rpm. Suggest dynamic forces are in-line horizontal or verttical. Likely that press mass sufficient alone to ensure natural frequency of foundation probably greater than 2xoperating. This is a useful rule-of-thumb.
Hope this helps.

 

[jheidt2543]

For the one newspaper printing press foundation I worked on, the manufacturer said that it could be set directly on the 6" floor slab. However, I just don't think that is good practice, so I used an isolated pad 18" thick with #4 rebar @ 12" c-c both ways. The other requirement was the pad had to be +/- 1/8" from end to end (not the "normal" +/- 1/8" in 10'). This may have been overkill but, when they changed presses a few years latter they could still use the same foundation.

 

[Tmoose]

If the press has any significant reciprocating forces I think the effective "plinth" width and length must be at least 2X the height of the CG. Also the plinth thickness should probably be at least 1/10 the width. It might also be nice if the plinth weight was at least 3X the machine weight, but as usual mass is NO SUBSTITUTE for proper width/length/thickness. There are a few sources that offer values of stiffness and allowble bearing loads for different soil types.

 

[isambarb]

thankyou for your replies.I have done some research of my own since using geotechnical references. Also there is some useful info in a Navfac paper.