Gallery, Projects and General > Project Logs |
The CNC experiment build. |
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NeoTech:
Can anyone gimme some input on this; Roller plunger limit switch or rotary roller limit switch.? |
awemawson:
Magnetic proximity sensor - long term reliability - what virtually all recent professional machines use |
NeoTech:
You have a link to what im looking for would be much appreciated. :) |
RotarySMP:
Hi Neotech, After I received a copy of Thomas Zietz GradingCurve.XLS, I had a look at what my local hardware store had which would be useful aggregate. From the garden section I got 4x 25 Kg bags as follows: 5-8mm pebbles - http://www.quarzwerke.at/datenblaetter/Quarzkies_ME_5,0_-_8,0.pdf 2-4mm crushed rock - (No data sheet - this stuff is sharp edged crushed rock for spreading on the icy footpath) 0.5-2mm quarz sand for improving your grass - http://www.quarzwerke.at/datenblaetter/Quarzsand_ME_0,5_-_2,0.pdf 0.1-0.3mm quarz sand for grout - http://www.quarzwerke.at/datenblaetter/ME23-Beschichtung.pdf Cool that the local quarry which supplies them publishes the datasheets with the screen sizes. Total cost of that 100kg was about €13. I still have some very fine alumina from making a furnace, so that will be my finest filler. It cost €16,50 for 5kg from a pottery supplier. So without even driving the 50km to the quarry, I could pick up a ton of aggreate for about €130 five minutes from home, although the alumina would get pricy for that amount. Using the grading spreadsheet, it gives me the following recipe to make up a liter of Polymer concrete: Grain 5 6,35 mm 100,00 26 % 259 ml 399 gr Grain 4 3,00 mm 74,09 26 % 263 ml 403 gr Grain 3 1,00 mm 47,74 20 % 203 ml 350 gr Grain 2 0,25 mm 27,42 16 % 157 ml 243 gr Grain 1 0,03 mm 11,74 12 % 117 ml 197 gr 100 %1000 ml 1592 gr The two largest aggregates are wet, so I am drying some in the oven. I read that moisture has a very detrimental effect on E/G strength. |
NeoTech:
:headbang: Very cool - i have found most of the grades as well but not the larger ones in a pebble state.. I can find coarse granite what is commonly used in concrete here in Sweden. Its not the rounded floodbed pebbles i had hoped for. I could find most of the aggregate i needed at a local flower and plants store in their outdoor section. When i said i needed about a ton in total of aggregate, they started to look funny at me. :lol: You have my email in a message regarding the xls file. =) |
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