#garfield Logs

Aug 17 2019

01:00 AM rue_shop1: hahaha I paid like $30 for a #2->#4 taper converter, and I already have one
11:45 AM Tom_L: morning
11:47 AM rue_bed: the slightly-over-optimum amount of clay for greensand is 15%
11:47 AM rue_bed: I been using 10%, which apparently sucks
06:25 PM Tom_L: have you had problems with 10%?
06:27 PM Tom_L: http://www.gizmology.net/greensand.htm
06:27 PM Tom_L: that says 10% is ok
06:38 PM Tom_L: https://www.instructables.com/id/Green-Sand-Formula-How-to-Make-Molding-Sand/
06:38 PM Tom_L: he says 30%
06:38 PM Tom_L: somebody's full of shit
06:38 PM Tom_L: i deduce the percentage varies due to the quality of materials used
10:46 PM rue_shop1: I was lookiking up graphs, apparently if I'm 15% I'm well into the "good enough" region
10:46 PM rue_shop1: er, corn starch, I have to try that today too
10:47 PM rue_shop1: I saw a graph, the bennifit stops around 13.8-14.2
10:47 PM rue_shop1: 15 is just after the effectiveness knuckle
10:47 PM rue_shop1: 10% is ok, but on the bottom end
10:48 PM rue_shop1: hey, I made a "stamp" and used it for some casting today
10:48 PM rue_shop1: had some help as one of the robotics kids came by
10:50 PM zhanx: nice
10:50 PM zhanx: I am playing with VHF right now
10:53 PM rue_shop1: k
11:01 PM rue_mohr: http://ruemohr.org/~ircjunk/projects/smelter/p1130353.jpg
11:01 PM rue_mohr: http://ruemohr.org/~ircjunk/projects/smelter/p1130355.jpg
11:02 PM rue_mohr: for just impression casting, I am thrilled!
11:02 PM zhanx: looks great
11:04 PM rue_mohr: I blew the vents and it still came out ok too
11:04 PM rue_mohr: only two of the vents hit their peices
11:05 PM rue_mohr: those are peices for the flasks, the alignment things
11:05 PM rue_mohr: have to drill holes in them
11:08 PM rue_mohr: it looks like spraying water between packed layers of sand might work to bind them
11:08 PM rue_mohr: same with the flask, spray water on cope and drag before filling
11:08 PM rue_mohr: and I'm getting the impression the drag was never moved during casting
11:09 PM rue_mohr: furthermore I dont know if the cope was ever put on side or flipped over
11:09 PM Tom_L: nice
11:10 PM rue_mohr: but these ARE small castings, so..