Epoxy-Granite machine bases (was Polymer concrete frame?)

**peteeng** · 02-19-2021, 04:23 PM

Hi Thomas - by 3 tests I think they mean a sample set ie 3 of the same test piece. This is for statistical coverage. So ask them do they mean 3 identical samples or 3 different materials.... Statistically material tests typically use 5 samples and for some of the work I do they require 6 samples so the reliability is greater. Follow up the other sources before you jump. Peter

Here's some numbers from a laminate test. I get 6 because it costs the same as 5 at the lab I use then the results are more useful with a particular design code...

**peteeng** · 02-19-2021, 07:13 PM

Hi Thomas - Heres a video of a test a person did on EG. If you do something like this and make an aluminium coupon you can ratio the deflection to the Al.. Cheers Peter

**badhabit** · 02-23-2021, 10:47 AM

Originally Posted by peteeng

Hi Thomas - by 3 tests I think they mean a sample set ie 3 of the same test piece. This is for statistical coverage. So ask them do they mean 3 identical samples or 3 different materials.... Statistically material tests typically use 5 samples and for some of the work I do they require 6 samples so the reliability is greater. Follow up the other sources before you jump. Peter

Mjea, after re-reading our mail correspondance i actually think that is up to me to do the statistics(if i want them)...then i'll have to send more samples... i've asked for clearification just to be sure...

Anyways, it has proven very difficult to obtain the proper casting moulds for a testsample...a cylinder with 100x200mm or a 150x300mm... but split forms for this is not easy for me to find... actually i cannot find any locally and i've extended my search to china and other countries. But i would like the tests done ASAP so i can't wait 3 weeks for the moulds to arrive from China(or other countries for that matter) :-/ I found ONE locally(In Denmark) but they could not ship until April 1st...and by that time i've already cast all the parts, so no good :-)

By the way: Last week 2.000kg of Silimix282 arrived and today i got the 200L of epoxy. I've almost done with assembly of one of the moulds and hopefully i'll get started on machining the parts for the other mould this weekend... I've attached some pictures from midway in the mould assembly....It took quite a long time to model in fusion but it's turning out great... everything fits and works as expected...